KUREHA ECOLOGY MANAGEMENT CO., LTD.

SOLVENT RECOVERYAND ODOR REMOVALBY FLUIDIZED BED PROCESS

グループGroup

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Bead Activated Carbon (G-BAC) Conventional Charcoal

Simple, Continuous, Safe and Efficient

GASTAK FEATURES

Treated Gas

BAC Moverment

Gas Flow

Sieve Tray

Adsorption Section

Feed Gas

Steam

CarrierPipe

Isolation 　Section

Isolation 　Section

Desorption　Section

Desorption Gas

Carrier Gas

Tubes

RecoveredSolvent

Condenser

● Solvent laden feed gas enters the bottom of the adsorber, 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 organic compounds) occurs in a counter current fashion as the progressively cleaner gas contacts cleaner G-BAC, which maximizes the efficiency of the process.

● Spent G-BAC exiting the bottom of the adsorber is transferred to the top of the desorber and flows downward through the heat exchanger.

● A small volume of stripping gas flows upward through the desorber, counter current to the G-BAC flow, to maximize stripping efficiency.

● Solvent vapor exiting the top of the desorber is transferred to the condenser.

● Reusable solvent recovered in the process is of high quality.

　　　　　　　　(Right)Flow scheme of GASTAK Type OS

(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

(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

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GASTAK APPLICATIONS

GASTAK 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 TypeHeatingMedium

Desorption Gas

Removed Matter Features

Film CoatingTape CoatingGravure PrintingPaint Shop

SN Steam N2

TolueneXyleneMEKOther Organic Solvents

1. Low water content in recovered solvents2. No condensed water

Semiconductor PlantLiquid CrystalGravure Printing

HNFlue GasHeating OilElec. Heater

N2

PhenolNaphthaleneIPAOrganic Solvents

1. Low water content in recovered solvents2. No condensed water

Baking of CondimentsOrganic Fertilizer Plant HS

Flue GasHeating OilElec. Heater

SteamCurry OdorFertilizer OdorOdor Exhaust

1. High temp. desorption2. Odorless treated air3. Spent gas is incinerated

PVC Resin Mfg. PlantMedicine Mfg. Plant OS Direct Heating

by Steam Steam Methylene Chloride Endurance

Fertilizer PlantFilm Manufacturing Plant SA Steam Steam Perchloroethylene

1. Remarkably inexpensive to operate2. Low water content in recovered solvents3. No condensed water

PVC Plant SS Steam Steam VCM GASTAK fundamental type

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Organic Solvent Recovery

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, filmmanufacturing 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 ■

GASTAK TYPE SN

Purpose Solvent Recovery

Application Paint Shop Film Coating Tape CoatingFeed Gas Flow Rate (Nm3/min)

Temperature (deg C)CompositionConcentration (ppm)

65070

MEK,MCS2,050

24047

Toluene1,680

1,01050

Toluene, Ethyl Acetate etc.2,520

Treated Gas Concentration (ppm) 200 or less 30 or less 80 or less GASTAK Type SN SN SN

G-BAC Quantity (kg)Recycle Rate (kg/hr)

12,5002,800

1,500600

15,0004,000

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

600160

80160

800160

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

110530

3 (Make-up water)12

22100

31.5

110700

3 (Make-up water)12

Recovered Solvent (kg/hr) 260 100 530

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Single TowerModel

Two TowerModel

TYPE SN

Adsorber/DesorberTreated Gas

Nitrogen

Steam

CoolingWater

Condenser

recovered solvent

DecanterN2 Recycle

BlowerAir Blower

Feed GasGlower

Feed Gas

Flow Scheme

PICTURE OF TYPE SN MODELS

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Bead Activated Carbon Odor Removal Unit

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 Costs 　Fluidized 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 ■MODEL 50HN 80HN 120HN 180HN 240HN 300HN 420HN 550HN 750HN

Gas Flow Rate (m3/min) up 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

Dimensions　Width (mm)　Length (mm)　Height (mm)

300040005500

300045005500

300050005500

320050005500

320055005500

320060005500

350060005500

400070005500

450070005500

Electric Facility (kW) 24 26 28 35 39 39 50 57 65

Electric Consumption (kW)

15 16 17 21 24 24 30 35 39

Cooling Water 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6

N2 Gas (Nm3/h) 6 6 6 6 6 6 6 6 6

G-BAC Quantity (kg) 120 160 200 240 300 360 440 600 760

Operation Weight (ton) 5 6 6.5 7 8 9 11 13 16

GASTAK TYPE HN

*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.

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TYPE HN

STANDARD LAYOUT &

STANDARD FLOW

Treated Gas

LeanG-BAC

RickG-BAC

G-BAC

Smelly compounds

Feed Gas Blower

Adsorber

Carrier Gas Blower

Desorber Nitrogen

RecoveredSolvent

Condenser

CoolingWater

Standard Flow

Ｗ

Ｌ

Ｈ

Feed GasBlower Box

Adsorber

DesorberCondenser

Instrument Panel

Feed GasBlower Box

Desorber

Condenser

BAC Separator

Adsorber Desorber Condenser

Adsorber

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Reactivation of Beads Activated Carbon

Side-stream, high-temperature reactivation of G-BAC

GASTAK SSR

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 LifeSSR offers a unique option for maintaining carbonactivity over a long period of time : thus prolongsservice life of G-BAC.

● Concurrent ReactivationSSR continuously treats a small portion of theworking volume of G-BAC and removes high boilingpoint compounds.

SSR allows the customers to utilize the carbonadsorption for the circumstances which wouldbe difficult or impossible with standard systems.This option is not applicable to theconventional fixed bed systems.

(BELOW)

Picture of a standard SSR model(RIGHT)

An operational result is shown.

SSR is commissioned at 6

months after the start-up of GASTAK.

AN OPERATIONAL RESULTGASTAK Solvent Load Toluene 210 kg/h Adsorbent G-BAC 7,000kg SSR 1 set

Start-upRecoveryRate

MonthsGASTAK Start-up

Chronological Change of Recovery Rate

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TYPE SSR

Flow Scheme

Plot Plan & Elevation

KUREHA ECOLOGY MANAGEMENT CO., LTD.

HEADQUARTERS30 Shitannda, Nishiki-machi, Iwaki-shi,

Fukushima-Pref, 974-8232 JAPANTEL: (+81)246-63-1358 FAX: (+81)246-63-1359

OSAKA OFFICE2-2-28, Dojima Axis Bldg,

Dojimahama, Kita-ku, Osaka 530-0004 JAPANTEL: (+81)6-4795-8120 FAX: (+81)6-4795-8121