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Q.1 A liquid mixture containing 30.0 mol% benzene (B), 25.0% toluene (T), and the balance xylene (X) is fed to a distillation column. The botom product contains 98.0 mol% X and no B. 96.0% of the X in the feed is recovered in this stream. The overhead product is fed to a second distillation column. The overhead product from the second column contains 97.0% of the B in the feed to this column. The composition of this stream is 94.0 mol% B and the balance T. (a) Draw and label a flowchart of this process and do the degree-of-freedom analysis to prove that for an assumed basis of calculation, molar flow rates and compositions of all process streams can be calculated from the given information. (b) Calculate unkown process variables. (c) Calculate (i) the percentage of the benzene in the process feed that emerges in the overhead product from the second column and (ii) the percentage of the toluene in the process feed that emerges in the bottom product from the second column.

Q.1 A liquid mixture containing 30.0 mol% benzene (B), 25.0% toluene (T), and the balance xylene (X) is fed to a distillation column. The botom product contains 98.0 mol% X and no B. 96.0% of the X in the feed is recovered in this stream. The overhead product is fed to a second distillation column. The overhead product from the second column contains 97.0% of the B in the feed to this column. The composition of this stream is 94.0 mol% B and the balance T. (a) Draw and label a flowchart of this process and do the degree-of-freedom analysis to prove that for an assumed basis of calculation, molar flow rates and compositions of all process streams can be calculated from the given information. (b) Calculate unkown process variables. (c) Calculate (i) the percentage of the benzene in the process feed that emerges in the overhead product from the second column and (ii) the percentage of the toluene in the process feed that emerges in the bottom product 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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Q.1 A liquid mixture containing 30.0 mol% benzene (B), 25.0% toluene (T), and the balance xylene (X) is fed to a distillation column. The botom product contains 98.0 mol% X and no B. 96.0% of the X in the feed is recovered in this stream. The overhead product is fed to a second distillation column. The overhead product from the second column contains 97.0% of the B in the feed to this column. The composition of this stream is 94.0 mol% B and the balance T. (a) Draw and label a flowchart of this process and do the degree-of-freedom analysis to prove that for an assumed basis of calculation, molar flow rates and compositions of all process streams can be calculated from the given information. (b) Calculate unkown process variables. (c) Calculate (i) the percentage of the benzene in the process feed that emerges in the overhead product from the second column and (ii) the percentage of the toluene in the process feed that emerges in the bottom product from the second column.
Transcribed Image Text:Q.1 A liquid mixture containing 30.0 mol% benzene (B), 25.0% toluene (T), and the balance xylene (X) is fed to a distillation column. The botom product contains 98.0 mol% X and no B. 96.0% of the X in the feed is recovered in this stream. The overhead product is fed to a second distillation column. The overhead product from the second column contains 97.0% of the B in the feed to this column. The composition of this stream is 94.0 mol% B and the balance T. (a) Draw and label a flowchart of this process and do the degree-of-freedom analysis to prove that for an assumed basis of calculation, molar flow rates and compositions of all process streams can be calculated from the given information. (b) Calculate unkown process variables. (c) Calculate (i) the percentage of the benzene in the process feed that emerges in the overhead product from the second column and (ii) the percentage of the toluene in the process feed that emerges in the bottom product from the second column.
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