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SOLVENT RECOVERYAND ODOR REMOVALBY FLUIDIZED BED PROCESSKUREHA ECOLOGY MANAGEMENT CO., LTD.

GASTAK FEATURES(1) Advantageous Features of Bead Activated Carbon (G-BAC)◊ High resistance to attrition, no dust produced◊ Small diameter, higher adsorption capacity homogenous fluidized bed◊ Low ash content, no catalytic reaction◊ No deterioration over repeated reactivation

Bead Activated Carbon (G-BAC)

Conventional Charcoal(2) Fluidized Bed Adsorption System◊ Adsorption in continuous fluidized bed and desorption in moving bed ensure uniform operation◊ Continuous fluidized bed prevents heat accumulation◊ Use of N2 or air minimizes or zeroes waste water◊ Higher gas velocity in adsorber allows smaller space requirement◊ Simple, uniform operation allows removal of dedicated operators

Simple, Continuous, Safe and Efficient● Solvent laden feed gas enters the bottom of theadsorber, and flows upward through the sieve
trays.
● Upward flow of the feed gas fluidizes the G-BAC
on the sieve trays.
● Adsorption of the VOC (volatile organiccompounds) occurs in a counter current fashion
as the progressively cleaner gas contacts
cleaner G-BAC, which maximizes the efficiencyof the process.
● Spent G-BAC exiting the bottom of the adsorberis transferred to the top of the desorber andflows downward through the heat exchanger.
● A small volume of stripping gas flows upward
through the desorber, counter current to theG-BAC flow, to maximize stripping efficiency.
● Solvent vapor exiting the top of the desorber istransferred to the condenser.
● Reusable solvent recovered in the process is ofhigh quality.
(Right)Flow scheme of GASTAK Type OS1

BAC MovermentGas FlowTreated Gas

Adsorption
SectionSieve Tray

Feed Gas

Carrier
Pipe

Isolation
SectionSteamTubes

Desorption
SectionCondenser
Desorption Gas

Isolation
SectionCarrier Gas

RecoveredSolvent

GASTAK APPLICATIONSGASTAK is applicable to wide range of objectives ranging
from the recovery of organic solvents to the removal of odor
and hazardous materials.
Following types are available according to objectives and to impurities contained in effluent gas.
Most suitable combination of heating medium and adsorption gas can be selected to ensure safe,
efficient and economical operation.

■ GASTAK TYPES ■Applications
Film Coating
Tape Coating
Gravure Printing
Paint Shop

TypeHeatingMedium

Desorption
Gas

Removed MatterFeatures

N2Toluene
XyleneMEK
Other OrganicSolvents

1. Low water content inrecovered solvents
2. No condensed water

1. Low water content inrecovered solvents
2. No condensed water

SNSteam

HN

Flue Gas
Heating Oil
Elec. Heater

N2

PhenolNaphthalene
IPA
Organic Solvents

Baking of Condiments
Organic Fertilizer Plant

HSFlue Gas
Heating Oil
Elec. Heater

SteamCurry Odor
Fertilizer Odor
Odor Exhaust

1. High temp. desorption
2. Odorless treated air
3. Spent gas is incinerated

PVC Resin Mfg. Plant
Medicine Mfg. Plant

OSDirect Heatingby Steam

SteamMethylene Chloride

Endurance

Semiconductor Plant
Liquid Crystal
Gravure Printing

Fertilizer Plant
Film Manufacturing Plant

SASteamSteamPerchloroethylene

1. Remarkably inexpensive
to operate
2. Low water content inrecovered solvents
3. No condensed water

PVC Plant

SSSteam

Steam

VCM

GASTAK fundamental type2

Organic Solvent
OrganicSolvent Recovery
RecoveryGASTAK TYPE SN
Efficient solvent recovery system avoiding waste water problem
GASTSAK TYPE SN is a continuous, efficient unit to liquefy and recover solvent vapors contained in effluent
gas stream using Kureha’s original Bead Activated Carbon (G-BAC) as adsorbent.
Rich G-BAC relieves the adsorbed solvent in the desorption section by means of hot nitrogen gas.
Thus the chemical composition of the recovered solvent is kept unaltered, enabling reuse of recovered solvent.
Consumption of nitrogen and steam is remarkably smaller than other processes, ensuring lower running costs.
Trace of water vapor contained in the feed gas condenses together with solvent and is separated in a decanter.
Plethora of experiences exist in various industries handling organic solvents such as printing shops, film
manufacturing plants and chemical plants.

Advantageous Features of GASTAK TYPE SN● Best Suited for Flammable Solvents
Desorption section is kept under nitrogen atmosphere.
A device to constantly monitor O2 concentration of the recycling N2 gas stream is provided.
● High Purity Solvent Recovered
No heavy metals contained in G-BAC and desorption under N2 atmosphere ensure very little chemical
decomposition of recovered solvent.
Recovery of water-soluble solvents such as acetone, iso-propyl-alcohol is possible.
● Easier Water Treatment
Desorption by nitrogen minimizes generation of waste water and ensures easier treatment.
● Low Running Costs
Nitrogen is recycled, minimizing consumption.
Continuous adsorption and desorption minimize water and steam consumption.
● Easy to Maintain
Minimal moving parts except for blowers allow easy, maintenance free operation.
● Optional SSR Available
Optional installation of Side Stream Regenerator (SSR) remarkably extends the life G-BAC.

■ GASTAK TYPE SN EXAMPLES ■Purpose

Solvent RecoveryApplication

Paint Shop

Film Coating

Tape Coating

Feed Gas

Flow Rate (Nm /min)
Temperature (deg C)
Composition
Concentration (ppm)

650
70
MEK,MCS
2,050

240
47
Toluene
1,680

1,010
50
Toluene, Ethyl Acetate etc.
2,520

Treated Gas

Concentration (ppm)

200 or less30 or less80 or less
SN

3

GASTAKTypeSNSN

G-BAC

Quantity (kg)
Recycle Rate (kg/hr)

12,500
2,800

1,500
600

15,0004,000

Desorption

Gas Rate (Nm3/hr)
Temperature (deg C)

600
160

80
160

800
160

Utility

Electricity (kW)Steam (kg/hr)
Cooling Water (ton/hr)
Nitrogen (Nm3/hr)

1105303 (Make-up water)
1222100
31.5

Recovered Solvent(kg/hr)

260

3100

110
700
3 (Make-up water)
12530

TYPE SNPICTURE OF TYPE SN MODELS

Single Tower
Model

Flow Scheme

Two Tower
Model

Adsorber/Desorber
Treated Gas

Nitrogen
SteamCooling
WaterCondenser

recovered solvent
Feed Gas

Feed Gas
GlowerAir Blower

N2 Recycle
Blower4DecanterBead Activated
Bead
Activated Carbon
Carbon Odor
Odor Removal
Removal Unit
Unit

GASTAK TYPE HN
Efficient solvent recovery system avoiding waste water problems
GASTAK TYPE HN is an efficient, easy-to-operate, maintenance-free odor removal unit using Kureha’s
original Bead Activated Carbon (G-BAC) as adsorbent.
In the adsorption section, fluidized bed provides uniform, highly efficient removal of odor compounds.
The G-BAC which has adsorbed odor compounds is air-lifted to the top of the desorption section for continuousdesorption.
G-BAC is heated up to 150 to 400 deg C in the desorption section.
Nitrogen is introduced in the bottom of the desorption section and contacts with the G-BAC to desorb the odorcompounds.
The odor compounds desorbed from the G-BAC is cooled and condensed in the condenser.

Advantageous Features of GASTAK TYPE HN● Water Treatment Not Required
Use of nitrogen as desorption gas eliminates spent water.
● Space Efficient
Fluidized bed allows lower space requirement for larger gas flow rates.
● Continuous Operation
Continuous adsorption and desorption provide uniform, continuous operation over long period of time.
Electricity, water and nitrogen are only utilities required for operation.
● Easy to Maintain
Minimal moving parts except for blowers allow maintenance free operation.
● Low Running CostsFluidized bed allows low pressure drop, resulting in extremely low electric power requirement.
Steam requirement is much less than fixed bed processes, alleviating treatment of waste water.

■ GASTAK TYPE HN MODELS ■50HN80HN

120HNup to 50

up to 80

up to 120 up to 180 up to 240 up to 300 up to 420 up to 550 up to 750

3000
4000
5500

3000
4500
5500

3000
5000
5500

3200
5000
5500

3200
5500
5500

3200
6000
5500

3500
6000
5500

4000
7000
5500

4500
7000
5500

Electric Facility (kW)242628353939

50

57

65

Electric Consumption(kW)

15161721242430

35

39

Cooling Water

0.60.6

0.6

0.6

0.6

0.6

0.6

0.60.6

N2 Gas (Nm3/h)

666666666G-BAC Quantity (kg)120160200

240

300

360

440600760

Operation Weight (ton)

566.5

789111316

MODEL
3

Gas Flow Rate (m /min)
Dimensions
Width (mm)Length (mm)Height (mm)180HN

*Desorption temperature is 200 deg C.
*Models for gas flow rates over 750 Nm3/min are available.
*Electricity consumption numbers include those for the chiller unit.

5240HN

300HN

420HN

550HN750HN

TYPE HN
STANDARD LAYOUT &STANDARD FLOW

DesorberAdsorberCondenser

Ｗ

BAC Separator
DesorberCondenser

AdsorberDesorberAdsorberCondenser

ＨFeed Gas
Blower Box

Feed Gas
Blower Box

Instrument Panel
Ｌ

Standard Flow

G-BAC
Smelly compounds

Treated Gas

Lean
G-BAC

Rick
G-BAC

Cooling
Water
Feed Gas Blower

Condenser
DesorberAdsorberNitrogen

Carrier Gas Blower
RecoveredSolvent6

Reactivation ofReactivationof Beads
Beads Activated
Activated Carbon
CarbonGASTAK SSR
Side-stream, high-temperature
Side-stream,
high-temperature reactivation
reactivation ofof G-BAC
G-BAC
Adsorption activity of Kureha’s Bead Activated Carbon (G-BAC), which is used in GASTAK process, may
decrease during a long period of use.
SSR is a side-stream, high-temperature, continuous reactivation apparatus specially designed for the G-BAC.

Advantageous Features of GASTAK SSR● Longer G-BAC Life
SSR offers a unique option for maintaining carbon
activity over a long period of time : thus prolongs
service life of G-BAC.
● Concurrent Reactivation
SSR continuously treats a small portion of theworking volume of G-BAC and removes high boilingpoint compounds.
SSR allows the customers to utilize the carbon
adsorption for the circumstances which would
be difficult or impossible with standard systems.
This option is not applicable to theconventional fixed bed systems.

AN OPERATIONAL RESULTGASTAK Solvent LoadAdsorbent
SSR

Chronological Change of Recovery Rate

RecoveryRate

GASTAK Start-up(BELOW)
Picture of a standard SSR model

Toluene 210 kg/h
G-BAC 7,000kg
1 set

Start-up

Months(RIGHT)
An operational result is shown.
SSR is commissioned at 6
months after the start-up of GASTAK.

7

TYPE SSR

Flow Scheme

Plot Plan & Elevation

8

KUREHA ECOLOGY MANAGEMENT CO., LTD.
HEADQUARTERSOSAKA OFFICE

30 Shitannda, Nishiki-machi, Iwaki-shi,
Fukushima-Pref, 974-8232 JAPANTEL: (+81)246-63-1358 FAX: (+81)246-63-1359

2-2-28, Dojima Axis Bldg,Dojimahama, Kita-ku, Osaka 530-0004 JAPANTEL: (+81)6-4795-8120 FAX: (+81)6-4795-8121