chbe2120fall2010hw5 - ChBE 2120 Homework 5 Due Friday...

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ChBE 2120 Homework 5 Due: Friday, October 1, at 8:05 AM In this homework, you will use HYSYS to design a reactor for the production of propylene diol (C 3 H 8 O 2 , HYSYS name: 12-C3diol) from propylene oxide (C 3 H 6 O, HYSYS name 12C3oxide) and water. Propylene diol is used in many different products, including antifreeze, coolant fluids, and deodorant sticks. The relevant chemical reaction is C 3 H 6 O + H 2 O Æ C 3 H 8 O 2 . If water is fed in excess, the reaction in kg-mole propylene diol produced/hr is k *[C3oxide], with , hr -1 and kJ/kg-mole. exp( / ) kA ER T =− 2 10 A = 4 10 E = You are to design a CSTR that converts 75 kg-mole/hr of pure propylene oxide fed at 24 O C and 500 kPa to propylene diol. The amount of water fed to the reactor must be kept in molar excess for the overall reaction and is to come from a fresh water stream with a flow rate of 75 kg- mole/hr and a recycle stream from a distillation column that will be used to separate the output from the reactor. The reactor output is to be at 500 kPa and 60 O C, which may require a heating or cooling stream to be connected to the reactor. Propylene diol and water are miscible, so a separation unit must be used to purify the reactor products. You are to use a distillation column to achieve this separation. Water has a lower boiling temperature than propylene diol, so water will be the main component in the vapor at the top of the column and propylene diol will be the main component in the liquid at the bottom of the column. In the distillation column setup, you should specify the mole fraction of propylene diol in the vapor stream to be 0.0001 and the mole fraction of water in the liquid stream to be
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This note was uploaded on 05/01/2011 for the course CHBE 2120 taught by Professor Gallivan during the Spring '07 term at Georgia Tech.

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chbe2120fall2010hw5 - ChBE 2120 Homework 5 Due Friday...

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