Group 5 Assignment 3

Recovery Acetonitrile and Toluene for Siloxane Process

Equipment Design

Group 5061145004 Gökçe Bacaksız061145034 Çelenk Muratlı061145040 Aslıhan Palabıyık061145045 Gökay Şenol

Introduction Siloxane ProcessWe were asked to design a

solvent seperation process for recycling Acetonitrile and Toluene solvents back into the siloxane polymerization unit. After polimerization process, there are three streams entering Recovery Unit.

Feed Stream Information

Recycle Stream Information

Waste Stream Information

Seperatıon Process Flow Sheet

Discription of Design Equipmant

First Equipment : Mixer

To mix Feed A, Feed B, Feed C.

Second Equipment: Distillation Column

Siloxane seperation Operation Condition, 30 oC and 1

atmLight Key Split ( acetonitrile) :

0.99999Heavy Key Split ( siloxane ) : 10-5

72 stages R/Rdmin=1.4

Third Equipment: Heat Exchanger

Cooling operation of distillate from 83 oC to 30 oC

Utility : 3345 kg/h Syltherm XLTCalculated area : 0.8 m2

Calculated U= 250 W/m2K

Fourth Equipment: Extraction Column

Acetonitrile extraction by water

Operation Condition, 30 oC and 1 atmAcetonitrile-Toluene-Water ternary

system equilibrium data [1]550 kg/h water3 StagesDiameter of column: 0.215 mLenght of column: 0.932 mType of column: RDC

Properties for Extraction Column

Fifth Equipment: Distillation Column

To obtain toluene rich stream ( Recycle A)

Light Key Split ( acetonitrile) : 0.9999

Heavy Key Split ( toluene ) : 0.13Azeotrope mixture from Top of

column13 stages R/Rdmin=1.4

Sixth Equipment: Pump

To sent extract to distillation columnPower: 2.5 WVolumetric flow rate: 0.442 m3/h Seventh Equipment: Pump

To sent feed stream to first distillation column

Power: 3.6 WVolumetric flow rate: 0.64 m3/h

Eighth  Equipment: Extraction Column

Acetonitrile extraction by p-xylene

Operation Condition, 30 oC and 1 atm

Acetonitrile-p-xylene-Water ternary system equilibrium data [2]

2 StagesDiameter of column: 0.096 mLenght of column: 0.476 mType of column: Karr column

Properties for Extraction Column

Ninth Equipment: Pump

To sent extract to distillation column

Power: 17.6 WVolumetric flow rate: 3.12 m3/h

Tenth Equipment: Distillation Column

To seperate p-xylene from acetonitrile water mixture (p-xylene recycle)

Light Key Split ( acetonitrile) : 0.9999

Heavy Key Split ( p-xylene ) : 10-5

32 stages R/Rdmin=1.4

Eleventh Equipment: Distillation Column

To seperate water from acetonitrile (Recycle B)

Light Key Split ( Toluene) : 0.9999Heavy Key Split ( acetonitrile ) : 10-5

57 stages R/Rdmin=1.4

Twelfth Equipment: PumpTo sent distillate to distillation columnPower: 4 WVolumetric flow rate: 0.7 m3/h

Thirteenth Equipment: MixerTo mix make-up p-xylene with recycle

p-xylene  Forteenth Equipment: MixerTo mix all waste stream. 

Fifteenth Equipment: Heat ExchangerCooling of Recycle p-xylene from 111 oC to 30 oCUtility : 25810 kg/h Syltherm XLTCalculated area : 5 m2

Calculated U= 250 W/m2K Fifteenth Equipment: Heat ExchangerCooling of Recycle water from 87 oC to 30 oCUtility : 7401 kg/h Syltherm XLTCalculated area : 1.72 m2

Calculated U= 250 W/m2K Seventeenth Equipment: MixerTo mix make-up water with recycle water

Acetonitrile = A Toluene = T Siloxane = S overall system Water = W P – xylene = P

Overall Recycle Of Toluene And Acetonitrile

Recycle toluene mass flow rate = 315 kg/h

% recycle toluene = % 86,7 Recycle acetonitrile mass flow rate = 133

kg/h% recycle toluene = % 84

Overall Stream Information

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