1. Suppose you have designed a reactor to produce cumene via the reaction of propylene and benzene: C3H6 + C6H6 à C9H12 In an undesired side reaction, cumene can react with propylene to form p-diisopropylbenzene (p-DIPB): C3H6 + C9H12 à C12H18 a) Draw and label a flowchart of the process and do the degrees-of-freedom analysis based on extent of reaction, taking a basis of 100 mol C9H12 produced. Assume that the feed contains only propylene and benzene, and that all of the propylene is consumed in the reaction. b) Fill out the following table using the formula for extent of reaction. C3H6 C6H6 C9H12 C12H18 ni0 ni c) The reactor is designed to yield a 20% conversion of benzene and a selectivity of 10 mol C9H12/mol C12H18, with a negligible amount of propylene in the product gas. Solve for the unknowns from part (a) using the equations from part (b). d) Calculate the feed ratio (mol C6H6/mol C3H6) and the fractional yield of cumene. e) Suppose that the reactor effluent was sent to a distillation column where 100% of the benzene was separated in the overhead and recycled back to the reactor inlet, while 100% of the cumene and p-DIPB were separated in the bottoms. Draw and label the overall flowchart. f) Determine the amount of fresh benzene to be fed to the reactor. What would be the overall yield of cumene? Please solve part ( F ) as the prior parts have been requested separately!

Introduction to Chemical Engineering Thermodynamics

8th Edition

ISBN:9781259696527

Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Chapter1: Introduction

Section: Chapter Questions

Problem 1.1P

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1. Suppose you have designed a reactor to produce cumene via the reaction of propylene and benzene:

C3H6 + C6H6 à C9H12

In an undesired side reaction, cumene can react with propylene to form p-diisopropylbenzene (p-DIPB):

C3H6 + C9H12 à C12H18

a) Draw and label a flowchart of the process and do the degrees-of-freedom analysis based on extent of reaction, taking a basis of 100 mol C9H12 produced. Assume that the feed contains only propylene and benzene, and that all of the propylene is consumed in the reaction.

b) Fill out the following table using the formula for extent of reaction.

	C3H6	C6H6	C9H12	C12H18
ni0

ni

c) The reactor is designed to yield a 20% conversion of benzene and a selectivity of 10 mol C9H12/mol C12H18, with a negligible amount of propylene in the product gas. Solve for the unknowns from part (a) using the equations from part (b).

d) Calculate the feed ratio (mol C6H6/mol C3H6) and the fractional yield of cumene.

e) Suppose that the reactor effluent was sent to a distillation column where 100% of the benzene was separated in the overhead and recycled back to the reactor inlet, while 100% of the cumene and p-DIPB were separated in the bottoms. Draw and label the overall flowchart.

f) Determine the amount of fresh benzene to be fed to the reactor. What would be the overall yield of cumene?

Please solve part ( F ) as the prior parts have been requested separately!

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