Chemical Engineering Plant Design Lecture 07 Recycle ...
Post on 04-Dec-2021
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Chemical Engineering Plant Design
Lecture 07 Recycle Streams and more in UniSim
Instructor: David Courtemanche
CE 408
Recycle Streams• Example 1 (note set “Linear Equations” posted on the Lecture 1 notes column):
• Flow sheet shows 1 minute basis
• A refers to n-octane and B refers to i-octane
• Feed is 120 mol of pure A
• Reactor yields 40% conversion for reaction A -> B
• Distillation produces top and bottom products that are 95% pure
• B is lighter (more volatile) than A
• Determine all of the unknown mole numbers indicated with question marks
• How many moles of product (95 mol%B, 5 mol % A) exit per mole of feed?
• Reactors in UniSim generate both a liquid and vapor stream – set vapor stream to 0 flow rate• This simulation uses a short cut distillation, could have used a splitter
• We are doing mass balances and are not concerned with number of stages or reflux ratio, etc
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