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A two column system is used to obtain a benzene rich stream and an ethylbenzene rich stream from a mixture of benzene (B), ethylbenzne (EB) and styrene (S). All streams contain all the three components. The feed to the first column contains 32 wt% B, 19 wt% EB and 49 wt% S with a total mass flow rate of 900 kg min-. The tops from the first column contains 94 wt% B, 4.0 wt% EB and 2.0 wt% S with a total mass flow rate 27 % that of the feed to the first column. 96 % of the ethylbenzene in the bottoms from the first column (which is the feed to the second column) leaves the second column at the tops, which has a composition 12 wt% B, 76 wt% EB and 12 wt% S. (i) With thee aid of a well labelled diagram, carry out a degree of freedom analysis over each of the columns to confirm that enough information is given to be able to solve for the unknowns on your diagram. (ii) Determine the flow rate and composition of the bottoms from the second column.

A two column system is used to obtain a benzene rich stream and an ethylbenzene rich stream from a mixture of benzene (B), ethylbenzne (EB) and styrene (S). All streams contain all the three components. The feed to the first column contains 32 wt% B, 19 wt% EB and 49 wt% S with a total mass flow rate of 900 kg min-. The tops from the first column contains 94 wt% B, 4.0 wt% EB and 2.0 wt% S with a total mass flow rate 27 % that of the feed to the first column. 96 % of the ethylbenzene in the bottoms from the first column (which is the feed to the second column) leaves the second column at the tops, which has a composition 12 wt% B, 76 wt% EB and 12 wt% S. (i) With thee aid of a well labelled diagram, carry out a degree of freedom analysis over each of the columns to confirm that enough information is given to be able to solve for the unknowns on your diagram. (ii) Determine the flow rate and composition of the bottoms from the second column.

Introduction to Chemical Engineering Thermodynamics
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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A two column system is used to obtain a benzene rich stream and an ethylbenzene rich stream from a mixture of benzene (B), ethylbenzne (EB) and styrene (S). All streams contain all the three components. The feed to the first column contains 32 wt% B, 19 wt% EB and 49 wt% S with a total mass flow rate of 900 kg min-!. The tops from the first column contains 94 wt% B, 4.0 wt% EB and 2.0 wt% S with a total mass flow rate 27 % that of the feed to the first column. 96 % of the ethylbenzene in the bottoms from the first column (which is the feed to the second column) leaves the second column at the tops, which has a composition 12 wt% B, 76 wt% EB and 12 wt% S. (i) With thee aid of a well labelled diagram, carry out a degree of freedom analysis over each of the columns to confirm that enough information is given to be able to solve for the unknowns on your diagram. (ii) Determine the flow rate and composition of the bottoms from the second column.
Transcribed Image Text:A two column system is used to obtain a benzene rich stream and an ethylbenzene rich stream from a mixture of benzene (B), ethylbenzne (EB) and styrene (S). All streams contain all the three components. The feed to the first column contains 32 wt% B, 19 wt% EB and 49 wt% S with a total mass flow rate of 900 kg min-!. The tops from the first column contains 94 wt% B, 4.0 wt% EB and 2.0 wt% S with a total mass flow rate 27 % that of the feed to the first column. 96 % of the ethylbenzene in the bottoms from the first column (which is the feed to the second column) leaves the second column at the tops, which has a composition 12 wt% B, 76 wt% EB and 12 wt% S. (i) With thee aid of a well labelled diagram, carry out a degree of freedom analysis over each of the columns to confirm that enough information is given to be able to solve for the unknowns on your diagram. (ii) Determine the flow rate and composition of the bottoms from the second column.
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