Chapter 5: Non-Energy Products from Fuels and Solvent Use

CHAPTER 5

NON-ENERGY PRODUCTS FROMFUELS AND SOLVENT USE2006 IPCC Guidelines for National Greenhouse Gas Inventories

5.1

Volume 3: Industrial Processes and Product Use

Authors
Jos G. J. Olivier (Netherlands)
Domenico Gaudioso (Italy), Michael Gillenwater (USA), Chia Ha (Canada), Leif Hockstad (USA), Thomas
Martinsen (Norway), Maarten Neelis (Netherlands), Hi-chun Park (Republic of Korea), and Timothy Simmons(UK)

Contributing Author
Martin Patel (Netherlands)

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Chapter 5: Non-Energy Products from Fuels and Solvent Use

Contents
5

Non-Energy Products from Fuels and Solvent Use.......................................................................................5.5
5.1

Introduction ...........................................................................................................................................5.5

5.2

Lubricant use.........................................................................................................................................5.6

5.2.1

Introduction ...................................................................................................................................5.6

5.2.2

Methodological issues ...................................................................................................................5.6

5.2.2.1

Choice of method.....................................................................................................................5.7

5.2.2.2

Choice of emission factors.......................................................................................................5.9

5.2.2.3

Choice of activity data .............................................................................................................5.9

5.2.2.4

Completeness...........................................................................................................................5.9

5.2.2.5

Developing a consistent time series .......................................................................................5.10

5.2.3
5.2.3.1

Emission factor uncertainties.................................................................................................5.10

5.2.3.2

Activity data uncertainties .....................................................................................................5.10

5.2.4

5.3

Uncertainty assessment ...............................................................................................................5.10

Quality Assurance and Quality Control (QA/QC), Reporting and Documentation.....................5.10

5.2.4.1

Quality Assurance and Quality Control .................................................................................5.10

5.2.4.2

Reporting and Documentation ...............................................................................................5.10

Paraffin wax use ..................................................................................................................................5.11

5.3.1

Introduction .................................................................................................................................5.11

5.3.2

Methodological issues .................................................................................................................5.11

5.3.2.1

Choice of method...................................................................................................................5.11

5.3.2.2

Choice of emission factors.....................................................................................................5.12

5.3.2.3

Choice of activity data ...........................................................................................................5.12

5.3.2.4

Completeness.........................................................................................................................5.13

5.3.2.5

Developing a consistent time series .......................................................................................5.13

5.3.3
5.3.3.1

Emission factor uncertainties.................................................................................................5.13

5.3.3.2

Activity data uncertainties .....................................................................................................5.13

5.3.4

5.4

Uncertainty assessment ...............................................................................................................5.13

Quality Assurance and Quality Control (QA/QC), Reporting and Documentation ................... 5.13

5.3.4.1

Quality Assurance and Quality Control .................................................................................5.13

5.3.4.2

Reporting and Documentation ...............................................................................................5.13

Asphalt production and use .................................................................................................................5.14

5.4.1

Introduction .................................................................................................................................5.14

5.4.2

Methodological issues .................................................................................................................5.15

5.4.3

Completeness ..............................................................................................................................5.16

5.4.4

Uncertainty assessment ...............................................................................................................5.16

5.4.5

Reporting and Documentation.....................................................................................................5.16

5.5

Solvent use ..........................................................................................................................................5.16

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5.5.1

Introduction .................................................................................................................................5.16

5.5.2

Completeness ..............................................................................................................................5.17

5.5.3

Developing a consistent time series.............................................................................................5.17

5.5.4

Uncertainty assessment ...............................................................................................................5.17

References.....................................................................................................................................................5.18

Equations
Equation 5.1

Basic formula for calculating CO2 emissions from non-energy product uses .......................5.5

Equation 5.2

Lubricants – Tier 1 method ...................................................................................................5.7

Equation 5.3

Lubricants – Tier 2 method ...................................................................................................5.8

Equation 5.4

Waxes – Tier 1 method........................................................................................................5.11

Equation 5.5

Waxes – Tier 2 method........................................................................................................5.11

FiguresFigure 5.1

Sectoral allocation of emissions from lubricants and waxes .................................................5.7

Figure 5.2

Decision tree for CO2 from non-energy uses of lubricants....................................................5.8

Figure 5.3

Decision tree for CO2 from non-energy uses of paraffin waxes ..........................................5.12

TablesTable 5.1

Non-energy product uses of fuels and other chemical products ............................................5.6

Table 5.2

Default oxidation fractions for lubricating oils, grease and lubricants in general .................5.9

Box
Box 5.1

5.4

Asphalt production and use .................................................................................................5.14

2006 IPCC Guidelines for National Greenhouse Gas Inventories

Chapter 5: Non-Energy Products from Fuels and Solvent Use

5 NON-ENERGY PRODUCTS FROM FUELS ANDSOLVENT USE
5.1

INTRODUCTION

This section provides methods for estimating emissions from the first use of fossil fuels as a product for primary
purposes other than i) combustion for energy purposes and ii) use as feedstock or reducing agent. Emissions
from the latter two uses are accounted for by methods described in the chemical industry (Chapter 3) and inmetal industry (Chapter 4).
The products covered here comprise lubricants, paraffin waxes, bitumen/asphalt, and solvents. Emissions fromfurther uses or disposal of the products after first use (i.e., the combustion of waste oils such as used lubricants)
are to be estimated and reported in the Waste Sector when incinerated or in the Energy Sector when energy
recovery takes place.
Generally, the methods for calculating carbon dioxide (CO2) emissions from non-energy product uses follow abasic formula, in which the emission factor is composed of a carbon content factor and a factor that represents
the fraction of fossil fuel carbon that is Oxidised During Use (ODU), e.g., actual co-combustion of the fractionof lubricants that slips into the combustion chamber of an engine). This concept is applied to oxidation during
first use only of lubricants and paraffin waxes and not to subsequent uses (e.g., energy recovery):
EQUATION 5.1
BASIC FORMULA FOR CALCULATING CO2 EMISSIONS FROM NON-ENERGY PRODUCT USES
CO2 Emissions = ∑ (NEU i • CCi • ODU i ) • 44 / 12i

Where:
CO2 Emissions = CO2 emissions from non-energy product uses, tonne CO2
NEUi = non-energy use of fuel i, TJ
CCi = specific carbon content of fuel i, tonne C/TJ (=kg C/GJ)ODUi = ODU factor for fuel i, fraction
44/12 = mass ratio of CO2/C
The production and use of asphalt for road paving and roofing and the use of solvents derived from petroleum
and coal are either not sources or are negligible sources of direct greenhouse gas emissions. They are, however,included in this chapter since they are sometimes substantial sources of non-methane volatile organic compounds(NMVOC) and carbon monoxide (CO) emissions which eventually oxidise to CO2 in the atmosphere. The
resulting CO2 input can be estimated from the emissions of these non-CO2 gases (see Section 7.2.1.5 of Volume1). While almost negligible for asphalt, for solvent use this may have some significance. Emissions from anyother non-energy product of fossil fuels not described here should be reported under the subcategory 2D4‘Other’.
There may be a risk that some of the CO2 emissions calculated for this source category could be partly accounted
for elsewhere. Cases where this may occur are clearly indicated in the subsequent sections and should be crosschecked to avoid double counting.
Methane (CH4) emissions from the activities covered in this chapter are expected to be minor or not to occur atall. Although some CH4 emissions occur from asphalt production and use for road paving, no method to estimate
CH4 emissions is provided since these emissions are expected to be very negligible.
Section 1.4 of Chapter 1 of this volume provides guidance for assessing consistency and completeness of carbon
emissions from non-energy and feedstock use of fuels by (a) checking that non-energy use/feedstock
requirements of processes included in the inventory are in balance with the non-energy use/feedstock supply as
recorded in national energy statistics, (b) checking that total reported bottom-up calculated CO2 emissions from
non-energy use/feedstock sources at different subcategory levels are complete and consistent, (c) documenting
and reporting how these emissions are allocated in the inventory. The sources described in this chapter are partof the verification of completeness of fossil CO2 from non-energy sources and reporting of their allocation.

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TABLE 5.1
NON-ENERGY PRODUCT USES OF FUELS AND OTHER CHEMICAL PRODUCTS
Types of fuels used

Examples of non-energy uses

Gases covered in this chapter
CO2

Lubricants

Lubricants used in transportation and industry;
Section 5.2

X

Paraffin waxes

Candles, corrugated boxes, paper coating, board
sizing, adhesives, food production, packaging;
Section 5.3

X

NMVOC, CO

Bitumen; road oil and otherpetroleum diluents

Used in asphalt production for road paving ande.g., in roofing; Section 5.4

XWhite spirit1, kerosene2, somearomatics

As solvent e.g. for surface coating (paint), drycleaning; Section 5.5

X

5.2

LUBRICANT USE

5.2.1

Introduction

Lubricants are mostly used in industrial and transportation applications. Lubricants are produced either at
refineries through separation from crude oil or at petrochemical facilities. They can be subdivided into (a) motor
oils and industrial oils, and (b) greases, which differ in terms of physical characteristics (e.g., viscosity),commercial applications, and environmental fate.

5.2.2

Methodological issues

The use of lubricants in engines is primarily for their lubricating properties and associated emissions are
therefore considered as non-combustion emissions to be reported in the IPPU Sector. However, in the case of 2stroke engines, where the lubricant is mixed with another fuel and thus on purpose co-combusted in the engine,the emissions should be estimated and reported as part of the combustion emissions in the Energy Sector (seeVolume 2).
It is difficult to determine which fraction of the lubricant consumed in machinery and in vehicles is actually
combusted and thus directly results in CO2 emissions, and the fraction not fully oxidised that results firstly in
NMVOC and CO emissions (except for the use in 2-stroke engines, which is excluded here). For this reason,these NMVOC and CO emissions are very seldom reported by countries in the emission inventories. Therefore,
for calculating CO2 emissions the total amount of lubricants lost during their use is assumed to be fully
combusted and these emissions are directly reported as CO2 emissions.
Regulations and policies for the disposal of used oil in most OECD countries often restrict landfilling anddumping, and encourage the separate collection of used oil. A small proportion of lubricants oxidises during use,
but the main contribution to emissions is when the waste lubricants are collected at the end of their use, in
accordance with country-specific regulations, and subsequently combusted. These waste oil handling emissions,however, are to be reported in the Waste Sector (or in the Energy Sector when energy recovery takes place).
Figure 5.1 illustrates this.

1

Also known as mineral turpentine, petroleum spirits, industrial spirit (‘SBP’).

2

Also known as paraffin or paraffin oils (UK, South Africa).

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Chapter 5: Non-Energy Products from Fuels and Solvent Use

Figure 5.1

Sectoral allocation of emissions from lubricants and waxes
Lubricants andWaxes

Primary Usage(i.e., lubrication orfor coating)

Carbonreleased toatmosphere

Emissions reported
in IPPU Sector

Carbon remaining
in products

Secondary fateafter Primary Usage(i.e., Combusted for
useful Heat/Energy)(i.e., Disposed,
landfilled, or
incinerated)

Carbon released
to atmosphere

Carbon released
to atmosphere

Emissions reported in
Energy Sector

Emissions reported in
Waste Sector

Since CH4 and N2O emissions are very small in comparison to CO2, these can be neglected for the greenhousegas calculation.

5.2.2.1

C HOICE OF METHOD

There are two methodological tiers for determining emissions from the use of lubricants. Both Tier 1 and Tier 2
rely on essentially the same analytical approach, which is to apply emission factors to activity data on theamount of lubricant consumption in a country (in energy units, e.g., TJ). The Tier 2 method requires data on thequantities of different types of lubricants, excluding the amount used in 2-stroke engines, in combination with
type-specific Oxidised During Use (ODU) factors to activity data, preferably country-specific, while the Tier 1
method relies on applying one default ODU factor to total lubricant activity data (see decision tree, Figure 5.2).
Since the default ODU factor is four times smaller for greases than for lubricating oils, using a higher tiermethod will primarily capture the impact of using actual fractions of oils and greases in the emission calculation.
It is considered good practice to use the Tier 2 method when this is a key category.
Tier 1: CO2 emissions are calculated according to Equation 5.2 with aggregated default data for the limited
parameters available and the ODU factor based on a default composition of oil and greases in total lubricant
figures (in TJ units):
EQUATION 5.2
LUBRICANTS – TIER 1 METHOD
CO2 Emissions = LC • CC Lubricant • ODU Lubricant • 44 / 12
Where:
CO2 Emissions = CO2 emissions from lubricants, tonne CO2
LC = total lubricant consumption, TJ
CCLubricant = carbon content of lubricants (default), tonne C/TJ (= kg C/GJ)
ODULubricant = ODU factor (based on default composition of oil and grease), fraction
44/12 = mass ratio of CO2/C

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Tier 2: The Tier 2 method for lubricants relies on a similar equation, however detailed data on the quantities
consumed per type of lubricants use (in energy units, e.g., TJ) and, preferably, country-specific emission factors
should be used. The emission factors are composed of fuel type specific carbon content and the ODU factor:
EQUATION 5.3
LUBRICANTS – TIER 2 METHOD
CO2 Emissions = ∑ (LCi • CCi • ODU i ) • 44 / 12i

Where:
CO2 Emissions = CO2 emissions from lubricants, tonne CO2
LCi = consumption of lubricant type i, TJ
CCi = carbon content of lubricant type i, tonne C/TJ (= kg C/GJ)ODUi = ODU factor for lubricant type i, fraction
44/12 = mass ratio of CO2/C
Lubricant i refers to motor oils/industrial oils and greases separately, excluding the amount used in 2-stroke
engines.
In both tiers the carbon contents may be the default value for lubricants described in Volume 2 (Chapter 1, Table
1.3), or a country-specific value, if available.
Figure 5.2

Decision tree for CO 2 from non-energy uses of lubricantsStart

Are data collected for
non-energy uses of lubricants, motor oils
and greases?

No

Collect activity data.

Yes

Estimate CO2 emissions using countryspecific quantities of lubricants, excluding
the amount used in 2-stroke engines (seeFigure 5.1 in this Chapter and Volume 2,
Chapter 3 on road transportation)Yes

Are country-specificstatistics available on the fates andcomposition of lubricants, motor oils
and greases?

Box 2: Tier 2
No
Is Category 2D
a key category1 and is Lubricant
Use a significant
subcategory?

No

Estimate CO2 emissions using
the IPCC default oxidation fraction.
Box 1: Tier 1

Yes
Collect data for the Tier 2 method.
Note:
1. See Volume 1 Chapter 4, Methodological Choice and Identification of Key Categories (noting Section 4.1.2 on limited resources), for
discussion of key categories and use of decision trees.

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Chapter 5: Non-Energy Products from Fuels and Solvent Use

5.2.2.2

C HOICE OF EMISSION FACTORSThe emission factor is composed of a specific carbon content factor (tonne C/TJ) multiplied by the ODU factor.
A further multiplication by 44/12 (the mass ratio of CO2/C) yields the emission factor (expressed as tonne
CO2/TJ). For lubricants the default carbon contents factor is 20.0 kg C/GJ on a Lower Heating Value basis. (SeeTable 1.3 in Chapter 1 of Volume 2. Note that kg C/GJ is identical to tonne C/TJ.) It is assumed that use iscombustion resulting in 100 percent oxidation to CO2, with no long-term storage of carbon in the form of ash or
post-combustion residue. A small fraction of lubricating oils is oxidised during use (see Table 5.2). An evensmaller fraction of greases are oxidised during use. Default ODU factors for oils (20 percent) and greases (5percent) are based on limited available data (Table 5.2).
Tier 1: Having only total consumption data for all lubricants (i.e., no separate data for oil and grease), theweighted average ODU factor for lubricants as a whole is used as default value in the Tier 1 method. Assumingthat 90 percent of the mass of lubricants is oil and 10 percent is grease, applying these weights to the ODU
factors for oils and greases yields an overall (rounded) ODU factor of 0.2 (Table 5.2). This ODU factor can thenbe applied to an overall carbon content factor, which may be country-specific or the default value for lubricants
to determine national emission levels from this source when activity data on the consumption of lubricants is
known (Equation 5.2).
Tier 2: Those countries with specific details on the specific quantities of lubricants used as motor oils/industrial
oils and as greases can apply different ODU factors, either the default values of 0.2 and 0.05, respectively, or
their own ODU factors for lubricants and greases based on national knowledge. These default or country-specificODU factors can then be multiplied with the country-specific carbon content factors or the single default IPCC
carbon content factor for lubricants to determine national emission levels (Equation 5.3).
TABLE 5.2
DEFAULT OXIDATION FRACTIONS FOR LUBRICATING OILS, GREASE AND LUBRICANTS IN GENERAL
Default fraction in total lubricant a (%)

ODU factor

Lubricating oil (motor oil /industrial oils)

90

0.2

Grease100.05

Lubricant / type of use

IPCC Default for total lubricants

b

0.2

a

Excluding the use in 2-stroke engines.

b

Assuming 90 percent lubricating oil consumption and 10 percent grease consumption and rounded to one significant digit.

Source: Rinehart (2000).

5.2.2.3

C HOICE OF ACTIVITY DATA

Data on the non-energy use of lubricants are required to estimate emissions, with activity data expressed inenergy units (TJ). To convert consumption data in physical units, e.g., in tonnes, into common energy units, e.g.,
in TJ (on a Lower Heating Value basis), calorific values are required (for specific guidance see Section 1.4.1.2 ofChapter 1 of Volume 2 on Energy). Basic data on non-energy products used in a country may be available fromproduction, import and export data and on the energy/non-energy use split in national energy statistics.
Additional information may need to be collected to determine the amount of lubricants being used in 2-stroke
engines, which should be excluded from the Tier 2 calculation in this source category. For the Tier 2 method, theindividual quantities applied as motor oil/industrial oils and as greases need to be separately known. For specificguidance on the data collection for lubricants used for 2-stroke engines, see Chapter 3 on Road Transport ofVolume 2: Energy.

5.2.2.4

C OMPLETENESS

Emissions from the use of lubricants in 2-stroke engines should be accounted for in the Energy Sector. Anyemissions that occur due to oxidation from post-use combustion or degradation after disposal should be
accounted for separately in the Waste Sector (or Energy Sector, if combustion is used for energy recovery). To
avoid double counting and to ensure completeness, the proper allocation of those emissions not related to thenon-combustion usage of lubricants in the Energy and Waste Sectors should be cross-checked.

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5.2.2.5

D EVELOPING A CONSISTENT TIME SERIESEmissions from lubricants should be calculated using the same method and data sets for every year in the timeseries.

5.2.3
5.2.3.1

Uncertainty assessment
E MISSION FACTOR UNCERTAINTIESThe default ODU factors developed are very uncertain, as they are based on limited knowledge of typicallubricant oxidation rates. Expert judgment suggests using a default uncertainty of 50 percent.
The carbon content coefficients are based on two studies of the carbon content and heating value of lubricants,from which an uncertainty range of about ±3 percent is estimated (U.S.EPA, 2004).

5.2.3.2

A CTIVITY DATA UNCERTAINTIESMuch of the uncertainty in emission estimates is related to the difficulty in determining the quantity of nonenergy products used in individual countries, for which a default of 5 percent may be used in countries with welldeveloped energy statistics and 10-20 percent in other countries, based on expert judgement of the accuracy ofenergy statistics. If the amount of lubricants used in 2-stroke engines, which is to be subtracted from the total
consumption used here, is not known, the uncertainty in the activity data will be higher and biased (too high). In
countries where a large fraction of the use is in 2-stroke engines, the uncertainty range in the activity data in thissection is much higher at the lower end, and can be estimated from the estimated share of 2-stroke engines in thenational consumption total.

5.2.4
5.2.4.1

Quality Assurance and Quality Control (QA/QC),
Reporting and Documentation
Q UALITY A SSURANCE AND Q UALITY C ONTROL

It is good practice to check the consistency of the total annual consumption figure with the production, importand export data. In addition, it is recommended to compare the amounts discarded, recovered and combusted andthe amount used in 2-stroke engines, if available, with total consumption figures in the calculation to check theinternal consistency of activity data and ODU factors used in the calculation of different source categories acrosssectors.

5.2.4.2

R EPORTING AND D OCUMENTATION

It is good practice to report and document:•

The total amount of lubricants produced, imported, exported, consumed, and discarded are to be reported
when available. In addition, the amount used for 2-stroke engines and subtracted should be reported. If thelatter information is not available or not used in the emission calculation this should be reported.

•

When using the Tier 2 method, the consumption data should be reported per type of lubricant used in thecalculation.

•

If the default ODU factor is used, this should be noted in the reporting documentation.

•

If a country-specific emission factor for lubricants was developed, in other words, if a country-specific ODUfactor and/or country-specific carbon contents fraction is used, the corresponding data should be provided
with an explanation of how this was measured.

•The allocation of CO2 emissions from lubricants in Table 1.6 on the allocation of CO2 from non-energy useof fossil fuels (see Chapter 1 of this volume).

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Chapter 5: Non-Energy Products from Fuels and Solvent Use

5.3

PARAFFIN WAX USE

5.3.1

Introduction

The category, as defined here, includes such products as petroleum jelly, paraffin waxes and other waxes,
including ozokerite (mixtures of saturated hydrocarbons, solid at ambient temperature). Paraffin waxes are
separated from crude oil during the production of light (distillate) lubricating oils. Paraffin waxes are categorisedby oil content and the amount of refinement.

5.3.2

Methodological issues

Waxes are used in a number of different applications. Paraffin waxes are used in applications such as: candles,
corrugated boxes, paper coating, board sizing, food production, wax polishes, surfactants (as used in detergents)and many others. Emissions from the use of waxes derive primarily when the waxes or derivatives of paraffinsare combusted during use (e.g., candles), and when they are incinerated with or without heat recovery or inwastewater treatment (for surfactants). In the cases of incineration and wastewater treatment the emissions
should be reported in the Energy or Waste Sectors, respectively (see Figure 5.1).

5.3.2.1

C HOICE OF METHOD

There are two methodological tiers for determining emissions and storage from paraffin waxes. Both Tier 1 andTier 2 rely on essentially the same analytical approach, which is to apply emission factors to activity data on theamount of paraffin waxes consumed in a country (in energy units, e.g., TJ). The Tier 2 method relies ondetermining the actual use of paraffin waxes and applying a country-specific ODU factor to activity data, while
the Tier 1 method relies on applying default emission factors to activity data (see decision tree, Figure 5.3).
Tier1: CO2 emissions are calculated according to Equation 5.4 with aggregated default data for the limited
parameters available:
EQUATION 5.4
WAXES – TIER 1 METHOD
CO2 Emissions = PW • CCWax • ODU Wax • 44 / 12

Where:
CO2 Emissions = CO2 emissions from waxes, tonne CO2
PW = total wax consumption, TJ
CCWax = carbon content of paraffin wax (default), tonne C/TJ (= kg C/GJ)ODUWax = ODU factor for paraffin wax, fraction
44/12 = mass ratio of CO2/C
Tier 2: The Tier 2 method for paraffin waxes relies on a similar equation, however detailed data on thequantities (possibly also on the types) of paraffin waxes produced (in energy units) and their respective use as
well as country-specific emission factors should be used:
EQUATION 5.5
WAXES – TIER 2 METHOD
CO2 Emissions = ∑ (PWi • CCi • ODU i ) • 44 / 12i

Where:
CO2 Emissions = CO2 emissions from waxes, tonne CO2
PWi = consumption of was type i, TJ
CCi = carbon content of wax type i, tonne C/TJ (= kg C/GJ)ODUi = ODU factor for wax type i, fraction
44/12 = mass ratio of CO2/C

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Figure 5.3

Decision tree for CO 2 from non-energy uses of paraffin waxes
Start

Are data collected for
non-energy uses of paraffinwaxes?

No

Collect activity data.

Yes

Are country-specificstatistics available on the fatesof waxes?

Yes

Estimate CO2 emissions using
a country-specific ODU factor.
Box 2: Tier 2

No
Is Category 2D
a key category1 and is Paraffin
Wax Use a significant
subcategory?

No

Estimate CO2 emissions using
the IPCC default ODU factor.
Box 1: Tier 1

Yes
Collect data for the Tier 2 method.
Note:
1. See Volume 1 Chapter 4, Methodological Choice and Identification of Key Categories (noting Section 4.1.2 on limited resources), for
discussion of key categories and use of decision trees.

5.3.2.2

C HOICE OF EMISSION FACTORS

A country-specific carbon content or default carbon content of 20.0 kg C/GJ (on a Lower Heating Value basis)should be applied. (See Table 1.3 in Chapter 1 of Volume 2. Note that kg C/GJ is identical to tonne C/TJ.) Thisdefault value is based on a combustion emission factor of 73.3 kg CO2/GJ (API, 2004).
Tier 1: It can be assumed that 20 percent of paraffin waxes are used in a manner leading to emissions, mainly
through the burning of candles, leading to a default ODU factor of 0.2 (Equation 5.4).
Tier 2: Those countries with specific details on the uses of paraffin waxes in the country can determine theirown country-specific ODU factors for waxes based on national knowledge of the combustion (Equation 5.5).
These factors can be combined with either the default carbon contents listed above or a country-specific carbon
contents if any are available.

5.3.2.3

C HOICE OF ACTIVITY DATA

Data on the use of paraffin waxes are required to estimate emissions, with activity data expressed in energy units(TJ). To convert consumption data in physical units, e.g., in tonnes, into common energy units, e.g., in TJ (on aLower Heating Value basis), calorific values are required (for specific guidance see Section 1.4.1.2 of Chapter 1of Volume 2 on Energy). Basic data on non-energy products used in a country may be available from production,
import and export data and on the energy/non-energy use split in national energy statistics. If the reported
national statistics do not contain this as a separate fuel category but instead only show this as part of an

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Chapter 5: Non-Energy Products from Fuels and Solvent Use

aggregated ‘other oil products’ category, the national statistical agency should be contacted, since the oil productstatistics are often collected at a more detailed level.

5.3.2.4

C OMPLETENESS

Emissions from incineration (without heat recovery) of wax coated boxes fall under the Waste Sector. Anyemissions from paraffin waxes that are produced due to energy recovery should be reported in the Energy Sector.

5.3.2.5

D EVELOPING A CONSISTENT TIME SERIESEmissions from paraffin waxes should be calculated using the same method and data sets for every year in thetime series. If a country-specific ODU factor is used, inventory compilers are encouraged to check whether themix of applications with emissive and storage fates changes significantly over time. If that is the case, the ODU
factors used per year should preferably reflect this change.

5.3.3
5.3.3.1

Uncertainty assessment
E MISSION FACTOR UNCERTAINTIESThe default emission factors are highly uncertain, because knowledge of national circumstances of paraffin wax
fates is limited. Ideally, a Tier 2 method would be employed in which national data on the use and fates of waxes
can be used as a surrogate to determine the quantities destined for an emissive fate versus storage fate. The
default carbon content coefficient is subject to an uncertainty range of ±5 percent (U.S.EPA, 2004). However,the ODU factor is highly dependent on specific-country conditions and policies and the default value of 0.2
exhibits an uncertainty of about 100 percent.

5.3.3.2

A CTIVITY DATA UNCERTAINTIESMuch of the uncertainty in emission estimates is related to the difficulty in determining the quantity of nonenergy products used and discarded in individual countries, for which a default of 5 percent may be used incountries with well developed energy statistics and 10-20 percent in other countries, based on expert judgementof the accuracy of energy statistics.

5.3.4
5.3.4.1

Quality Assurance and Quality Control (QA/QC),
Reporting and Documentation
Q UALITY A SSURANCE AND Q UALITY C ONTROL

It is good practice to check the consistency of the total annual consumption figure with the production, importand export data. In addition, the amounts discarded, recovered and combusted, if available, may be comparedwith total consumption figures in the calculation to check the internal consistency of activity data and ODUfactors used in the calculation of different source categories across sectors.

5.3.4.2

R EPORTING AND D OCUMENTATION

It is good practice to report and document country-specific emission factors, if these are used.
•

If a country-specific emission factor for waxes was developed, in other words, if a country-specific ODUfactor and/or country-specific carbon content fraction is used, the local value(s) with an explanation of theirderivation should be provided .

•If the default ODU factor is used, this should be noted in the reporting documentation.

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Volume 3: Industrial Processes and Product Use

5.4

ASPHALT PRODUCTION AND USE

5.4.1

Introduction

This source category comprises the non-combustion emissions from the production of asphalt in asphalt plants
other than refineries and its application (such as paving and roofing operations as well as subsequent releases
from the surfaces). It includes asphalt blowing for roofing. The production and use of asphalt results mainly inemissions of NMVOC, CO, SO2 and particulate matter, while the fate of the remaining hydrocarbons are stored
in the product (much less than one per cent of the carbon is emitted). Emissions from the installation of roofing
materials are assumed negligible. Emissions from the combustion of fuels needed to supply heat to the asphalt
processes (production or heating of the asphalt mix) are covered under the Energy Sector.
Asphalt is commonly referred to as bitumen, asphalt cement, or asphalt concrete or road oil and is mainly
produced in petroleum refineries. In some countries the laid mixed product is also referred to as ‘asphalt’ but it
also known as ‘macadam’. In view of the ambiguities created by differing nomenclatures, a single set of terms
will be adopted here and applied uniformly in the text without implying any preferences for the terms used (seeBox 5.1).
BOX 5.1
ASPHALT PRODUCTION AND USE

The heavy black and very viscous organic liquid mainly produced from refineries and used as afeedstock for the road paving and roofing materials will be termed bitumen, to distinguish it fromthe products made from it. This also conforms to the terminology used in international energy
statistics, which may provide some of the data required for emissions estimation. At normal
temperatures bitumen is in a semi-solid state. It is processed and used as illustrated in the figure
below.
Heat

Bitumen ex
refinery

Heat

Aggregates

Blown
Asphalts

Hot Mix
Asphalts

Liquefied
Asphalts

Diluents(gas oil, fueloil, etc.)

Cutback

Tack CoatsAir

Roofing
materials

Emulsified

Water/
Soaps

Road paving

The diagram shows that bitumen may be heated and mixed with aggregate of various sizes, diluted
with petroleum oils or water/soap emulsions, or heated and blown with air to polymerise/stabilise
it and make it suitable for e.g., the treatment of roofing materials. These will be termed ‘asphalt
processes’ and their products will be referred to as ‘asphalt products’

Bitumen and aggregates are mixed in either a fixed or mobile plant, usually within 30 to 50 km of the roadsurface paving site (EAPA, 2003). In industrialised countries typically 80 to 90 percent of bitumen is used forthe manufacture of road surface paving (U.S.EPA, 2004). However, in developing countries with rapid
infrastructural growth, the amount of bitumen used for roofing products may be of the same order of magnitude

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Chapter 5: Non-Energy Products from Fuels and Solvent Use

as those used for road paving (UNFCCC, 2004). Other uses of asphalt products are as binder or sealant in the
production of roofing material, as a foundation sealant, and other industrial uses such as pipe coating.
Direct greenhouse gas emissions, e.g., CO2 or CH4, associated with the production and use of asphalt are
negligible since the majority of the light hydrocarbon compounds were extracted during the refining process to
produce commercial fuels. From the EMEP/CORINAIR guidebook it can be concluded that CH4 emissions fromhot mix asphalt and cutback asphalt and from the asphalt roofing industry are negligible (EEA, 2005).
Greenhouse gas emissions from the use of recycled asphalt pavements as aggregate for new road paving are also
negligible.

5.4.2

Methodological issues

Emission methodologies and default emission factors for NMVOC and CO are presented in the Road Paving(SNAP code 040610), Roofing Materials (SNAP code 040611) and Asphalt Blowing (SNAP code 060310)
sections of the EMEP/CORINAIR Emission Inventory Guidebook (EEA, 2005). It is recommended that users
refer to the guidebook when developing detailed NMVOC and CO estimates. (See also Volume 1, Chapter 7 ofthese Guidelines.) Note that in EMEP/CORINAIR the emissions from asphalt blowing for roofing are separately
accounted for (under miscellaneous chemical product manufacture with SNAP code 060310).
Limestone may be used as part of the aggregate in the asphalt. However, no CO2 is assumed to be released in theheating process (see Section 2.5, Other Process Uses of Carbonates, under Chapter 2 of this volume).

PRODUCTION AND USE OF ASPHALT FOR ROAD PAVING
Asphalt paving consist of a mix of aggregate, sand, filler, bitumen and occasionally a number of additives.
Asphalt road surfaces are, thus, composed of compacted aggregate and bitumen binder. Hot Mix Asphalt (HMA)
is by far the most widely used, generally over 80 percent, and produces very few emissions (EAPA, 2003). Other
types of road paving include cutback asphalt and emulsified asphalt, which are both liquefied asphalts (EEA,
2005). Cutback asphalts are liquefied by blending with petroleum solvents (diluents such as heavy residual oils,
kerosene or naphtha solvents) and therefore show a relatively high level of emissions of CO and NMVOC due tothe evaporation of the diluent. Therefore most emissions from road paving will arise from the use of cutbackasphalts. Depending on the evaporation rate, three types are distinguished: Rapid-Cure (RC), using a naphtha or
gasoline-type diluent of high volatility, Medium-Cure (MC) using a diluent of medium volatility and Slow-Cure(SC) cutback asphalt which use oils of low volatility. This is in contrast to so-called emulsified asphalt that
contains mostly water and little or no solvent. The amount of diluent used is usually lower in warm countries
than in the cooler climates, and hence lower emission factors may be expected in warm countries.
Activity data for hot mix asphalt and production of cold mixes or ‘modified asphalt’ can be obtained for most
European and several other industrialised countries from the European Asphalt Pavement Association (EAPA) or
national paving and roofing associations such as the Asphalt Institute (EAPA, 2003; Asphalt Institute, 2004).
Hot mix asphalt typically contains about 8 percent asphalt cement (bitumen) (EEA, 2005), but this may differ
between countries (a figure of 5 percent has also been reported). For most industrialised countries the fraction of
cutback asphalt is a few per cent, however several show shares of 5 percent to 12 percent, and exceptional shares
up to 20 percent, or have none (EAPA, 2002; EAPA 2003; U.S. EPA, 2004). If the quantity of asphalt paved is
not known but rather the area paved, a conversion factor of 100 kg asphalt/m2 road surface may be used to
calculate the mass of asphalt produced.
Gases are emitted from the asphalt plant (hot mix, cutback or emulsified), the road surfacing operations andsubsequently by the road surface. The EMEP/CORINAIR Emission Inventory Guidebook provided processspecific uncontrolled emission factors for the different asphalt plants.

ASPHALT ROOFINGThe asphalt roofing industry produces saturated felt, roofing and siding shingles, roll roofing and sidings:
asphalt shingles, smooth surfaced organic and asbestos felt roll roofing, mineral surfaced organic and asbestos
felt roll roofing and sidings, asphalt saturated organic and asbestos felts, asphalt saturated and/or coated sheeting
and asphalt compound. Most of these products are used in roofing and other building applications. Asphalt felt,
roofing and shingle manufacture involves the saturation or coating of felt. Key steps in the total process include
asphalt storage, asphalt blowing, felt saturation, coating and mineral surfacing, of which asphalt blowing is
included here. Direct greenhouse gas emissions from asphalt roofing products are negligible compared toemissions such as NMVOC, CO and particulate matter.
Asphalt blowing is the process of polymerising and stabilising asphalt to improve its weathering characteristics.
Air blown asphalts are used in the production of asphalt roofing products. Blowing may take place in an asphalt

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Volume 3: Industrial Processes and Product Use

processing plant or an asphalt roofing plant (or in a refinery)3. Asphalt blowing leads to the highest emissions of
NMVOC and CO, more than the other process steps. All asphalt used for non-paving applications has beenblown (EEA, 2005).

5.4.3

CompletenessIf no emissions are (explicitly) available for this source category, it should be checked whether they are alreadyincluded elsewhere (e.g., in refinery emissions).

5.4.4

Uncertainty assessment

Although results from the use of more sophisticated methods are considered as the most accurate, the uncertainty
for NMVOC and CO emissions from road paving and asphalt roofing may be in the range of ±25 percent andlarger if the calculation was not based on detailed activity and control technology data (from −100 percent to +25
percent).
The emission factors for NMVOC and CO for batch mix and drum mix HMA production have an uncertainty
range of about ±50 percent, while the default factors for total HMA production and for cutback asphalt
production and use will be about ±100 percent uncertain (i.e., between -50 percent and +100 percent). Whencountry-specific emission factors are used for cutback asphalt production and paving, the uncertainty in theemission factors may be considerably smaller, e.g. in the range of ±50 percent.
Production data for HMA and cutback asphalt may be as accurate as ±10 percent, when based on data compiledby the asphalt production or construction industry. However, when activity data on cutback asphalt needs to be
extrapolated, the uncertainties are very large, since it has been observed for a number of countries that theamount of cutback asphalt used can vary substantially from year to year; factors of two or more are not rare
(EAPA, 2002; EAPA 2003; U.S. EPA, 2004). Also data on the mix of HMA production plant types and control
technology applied as well as on the mix of cutback asphalt types (RC, MC, SC) will generally be less accurate
than total production data. The uncertainty in production statistics of asphalt roofing material may be as accurate
as ±10 percent if accounting is complete. If that is not the case, the uncertainty at the high end of the range could
be as high as 100 percent or more.
The default fossil carbon content fraction of NMVOC from asphalt production and use for road paving varies
between 40 to 50 percent by mass and is about 80 percent for NMVOC from asphalt roofing (calculated from the
NMVOC speciation provided in the EMEP/CORINAIR Emission Inventory Guidebook).

5.4.5

Reporting and Documentation

The relatively small emissions from production and use of asphalt, including asphalt blowing, should be reported
under the subcategory 2D4 ‘Other’ of this source category 2D ‘Non-Energy Products from Fuels and Solvent
Use’.

5.5

SOLVENT USE

5.5.1

Introduction

The use of solvents manufactured using fossil fuels as feedstocks can lead to evaporative emissions of various
non-methane volatile organic compounds (NMVOC), which are subsequently further oxidised in the atmosphere.
Fossil fuels used as solvent are notably white spirit and kerosene (paraffin oil). White spirit is used as an
extraction solvent, as a cleaning solvent, as a degreasing solvent and as a solvent in aerosols, paints, woodpreservatives, lacquers, varnishes and asphalt products. In Western Europe about 60 percent of the total whitespirit consumption is used in paints, lacquers and varnishes. White spirit is the most widely used solvent in thepaint industry.
3

In UNECE inventories related emissions are accounted for under miscellaneous chemical product manufacture (separately
for asphalt roofing manufacture/application and for asphalt blowing, SNAP codes 040610 and 060310) or under fugitive
emissions from refineries (see EMEP/CORINAIR Emission Inventory Guidebook), but in the greenhouse gas inventory all
emissions, including the precursor emissions, should be reported under the subcategory 2D4 ‘Other’.

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Chapter 5: Non-Energy Products from Fuels and Solvent Use

Methodologies for estimating these NMVOC emissions can be found in the EMEP/CORINAIR Emission
Inventory Guidebook (EEA, 2005). This source category ‘solvent use’ is treated as a separate category because
the nature of this source requires a somewhat different approach to emissions estimation than that used for
calculating other emission categories. For this reason the 2006 IPCC Guidelines treats this also as a separate
subcategory. In the EMEP/CORINAIR guidebook the subcategory ‘solvent and other product use’ group 6 of theSelected Nomenclature for sources of Air Pollution (SNAP) and is subdivided into five subcategories. Excluding
the fifth: ‘other product use’ that refers to F-gases, N2O and ammonia, which are covered elsewhere in the IPPU
Volume these are:•

SNAP 0601: Paint application;•

SNAP 0602: Degreasing, dry cleaning and electronics;•

SNAP 0603: Chemical products manufacturing or processing. Including the processing of polyester, PVC,
foams and rubber, manufacture of paints, inks, glues and adhesives and the finishing of textile•

SNAP 0604: Other use of solvents and related activities. Including such activities as ‘enduction’ (i.e.,
coating) of glass wool and mineral wool, printing industry, fat and oil extraction, uses of glues andadhesives, wood preservation, domestic solvent use (other than paint application) and vehicle underseal
treatment and vehicle dewaxing.

Apart from emissions from road transport and, when occurring, production and handling of oil and biofuel
combustion, this source category is often the largest source of national NMVOC emissions and its share mayvary between 5 percent and 30 percent, with a global average of about 15 percent (Olivier and Berdowski, 2001).

5.5.2

Completeness

Emissions from this source category can be estimated using either a production-based or consumption-based
approach. If total domestic sales figures of paints etc. are not available, apparent national consumption can beinferred from production, imports and exports. However, if trade statistics are not complete, this may introduce asignificant uncertainty in the activity data. Thus, it is recommended that inventory compilers try to ensure that all
significant evaporative uses of solvent and other product use are addressed by NMVOC emission estimates.

5.5.3

Developing a consistent time series

Usually for this source category only small annual changes are expected. However, when environmental policies
are implemented to replace more toxic volatile compounds in solvents (e.g., with water,) both NMVOC
emissions and the fossil carbon content of the NMVOC emissions may change over time.

5.5.4

Uncertainty assessment

The uncertainty of the NMVOC emissions will generally be quite large, e.g., about ±50 percent, except for
countries that have developed a detailed inventory for these sources, in which case the uncertainty may be of theorder of 25 percent. The default fossil carbon content fraction of NMVOC is 60 percent by mass, based onlimited published national analyses of the speciation profile (U.S. EPA, 2002; Austria, 2004; Hungary, 2004;
Klein Goldewijk et al., 2005). It may vary between 50 and 70 percent carbon by mass, so having an uncertainty
of about ±10 percent. Country-specific fractions should have a lower uncertainty, e.g., ±5 percent.

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References
API (2004). Compendium of Greenhouse Gas Emissions Methodologies for the Oil and Gas Industry, American
Petroleum Institute (API), Table 4-2. Washington, DC, February 2004.
Asphalt Institute (2004). Website http://www.asphaltinstitute.org/ai_pages/links/, visited 19 November 2004.
Austria (2004). Austria’s National Inventory Report 2004. Submission under the United Nations Framework
Convention on Climate Change, Umweltbundesamt, BE-244, Vienna.
EAPA (2002). European Asphalt Pavement Association,, Asphalt in Figures 2002. Available at website
http://www.eapa.org, visited 19 November 2004.
EAPA (2003). European Asphalt Pavement Association,, Asphalt in Figures 2003. Available at website
http://www.eapa.org, visited 19 November 2004.
EEA (2005). “EMEP/CORINAIR. Emission Inventory Guidebook - 2005”, European Environment Agency,
Technical report No 30. Copenhagen, Denmark, (December 2005). Available from web site see:
http://reports.eea.eu.int/EMEPCORINAIR4/en
Hungary (2004). Hungarian National Inventory Report for 2002. General Directorate for Environment, Natureand Water, UN Framework Convention on Climate Change, Directorate for Environmental Protection,
Budapest.
Klein Goldewijk, K., Olivier, J.G.J., Peters, J.A.H.W., Coenen, P.W.H.G. and Vreuls, H.H.J. (2005). Greenhouse
Gas Emissions in the Netherlands 1990-2003. National Inventory Report 2005. RIVM Report no. 773201
009/2005. RIVM, Bilthoven.
Olivier, J.G.J. and Berdowski, J.J.M. (2001). Global emissions sources and sinks. In: Berdowski, J., Guicherit, R.
and B.J. Heij (eds.) "The Climate System", pp. 33-78. A.A. Balkema Publishers / Swets & Zeitlinger
Publishers, Lisse, The Netherlands. ISBN 90 5809 255 0.
Rinehart, T. (2000). Personal communication between Thomas Rinehart of U.S. Environmental Protection
Agency, Office of Solid Waste, and Randall Freed of ICF Consulting, July 2000.
UNFCCC(2004).
EmissionsdataandNational
Inventory
Reports.
Websitehttp://unfccc.int/national_reports/annex_i_ghg_inventories/national_inventories_submissions/items/2761.
php visited 19 November 2004.
U.S. EPA (2002). National Air Quality and Emissions Trends Report data, 1900-2000. United States
Environmental Protection Agency (U.S. EPA), Research Triangle Park, NC.
U.S. EPA (2004). Inventory of U.S. Greenhouse Gas Emissions and Sinks: 1990-2002. United States
Environmental Protection Agency (U.S. EPA), Washington, DC.

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