IMPLEMENTATION SCHEME
TOYO offers the best, optimized system as the result of thorough analysesof thermodynamics, distillation technology and economics.
TOYO provides a variety of services, from operating diagnostics services forexisting plants to basic design and EPC, to meet customers‘ demands.

Screening to pick up
potential applications

STEP 1Case study withrigorous simulation

STEP 2ProjectEconomics
evaluation

STEP 3

Launched

STEP 4FAQ
Q1. How many side heat exchangers will be installed?
A1. Typically three to five exchangers. It depends on the case.
Q2. How will the number and location of each side heat exchanger be decided?
A2. Intensive thermodynamic analysis will be made to optimize the number of heatexchangers, determine that their stages have the appropriate composition, and theirheat duties and the combination of stages for internal heat exchanges.

Q3. How will the distillation system be controlled?
A3. Operating pressure in high pressure column, low pressure column and reflux drum,
and the heat duty of each side heat exchanger will be manipulated in theappropriate manner, which provides stable operating condition.

Q4. What is the range of turndown operation that allows for energy saving?

Innovative
Energy Saving
Distillation System

A4. Normally up to 70-100% of the design capacity will be possible without any
deterioration in energy saving. But it depends on compressor capacity.

Q5. What type of compressor can be selected?
A5. A centrifugal, turbo or dry-screw type compressor can be selected, depending upon
the benefit in accordance with the CAPEX and OPEX.

Q6. Even if the compressor shuts down, can the system continue distillation operation?
A6. Thesystem can be designed with an alternate conventional

distillation mode if required. The conventional distillation mode allows for
operation without a compressor, but there is no energy saving benefit available.

Task Teamsuperhidic@toyo-eng.com
2-8-1 Akanehama, Narashino-shi, Chiba 275-0024, Japan
Tel: 81-47-451-1111
Fax: 81-47-454-1800

http://www.toyo-eng.com
is a trademark of Toyo Engineering Corporation registered in Japan (Registered Number: 5488562).

©2017 Toyo Engineering Corporation
H29.3.20 ③ BU

Innovative Energy Saving Distillation SystemBRINGING ABOUT THE WORLD’s FIRST COMMERCIAL PLANT, which is the ultimate form of energy conservation in
distillation, was selected to enhance energy conservation and to, developed by TOYO, provides excellent energy saving of above 50%

contribute to the reduction of greenhouse gas emissions by Maruzen
Petrochemicals Co. Ltd. (Japan) in 2014. The plant has been incompared to conventional distillation systems in various industrial applications.

commercial operation successfully since 2016.

offers attractive economics without utilizing special equipment,
but by applying well-proven technology related to distillation and heat transfer.

LocationJapan

Moreover, good maintainability can be achieved with

Process unit

MEKCapacity

21 kL/h of feed rate

Energy consumption inconventional distillation

6.3 MW

Energy conservation

50%+Separation conditions indesign

MEK in distillate: 99.92 wt%.

OVERVIEW

Feature1

FEED

than that in stripping section
This makes a transfer of the excess heat duty in

Stripping
Sectionthe rectifying section to stripping section possible.

Feature2

Stripping section (low pressure column) elevatedabove rectifying section (high pressure column)

Low PressureColumn

Side
Exchanger

APPLICATIONS

Reboiler

Condenser
DISTand/or gravity without pumping.

Existing component technology applied
All equipment is designed with proven technology andRectifying
Section

BTMs

Excellent energy saving and cost saving can be expected for the following conditions by introducing
in either existing column modification or new installations.

Side
Exchanger

Temperature difference between the overhead and the bottom lower than 80ºC

High Pressure
Columnmaintenance can be performed by conventional means.

CONCEPT

Expensive utilities
Large scale reboiler and/or condenser duty
Process units, which have been so far confirmed for the applicationenergy conservation, are shown below.

C4 Fractionation

been recognized as the ultimate energy saving distillation system, in a simplified manner.
Low
Pressure
ColumnHighPressure
ColumnCooling

Cracker
Downstream

Alkylation
C5 Isomerization
C6 Isomerization

HeatingHeat is supplied at the bottom reboiler
and removed at the top condenser.

C3=LPG

C4s

NaphthaLow
Pressure
ColumnEquipped with side condenser
and side reboiler
Heat duties at the bottom reboiler andthe top condenser are reduced by
the side exchangers.

Internal heatexchange

Pressurized rectifying sectionThen, the heat duty of the sidecondenser is supplied to the side reboiler.

HighPressureColumn

By replacing the elevation of the rectifying
section and the stripping section, internal
heat integration is accomplishedby thermo-siphon and/or gravity.

MEKIPA
EB/SM

Pyrolysis gas

Heat exchange bythermo-siphon(concept)

1C4=
iC4=

Steam Cracker

FCC for C3=

Reboiler

VCM
Oxo-alcohol

C4 Isomerization

SideReboiler

Conventional distillation

C2=
LPG

RefinerySide
Condenserof with excellent

LPG Preparation

realizes the concept of Heat Integrated Distillation Column (HIDiC), which has

Condenser

MEK in bottoms: 200 wtppm

Compressor

Side heat exchange is accomplished by thermo-siphon

Feature3

Operating pressure in rectifying section higher

BT Extracion

AromaticComplex
BT Extracion
Isomerization

Reformerp-Xylene
Trans-alkylation
Disproportionation