A feed to a distillation column consisting of 54 wt% benzene and 46 wt% toluene is separated into two product streams by fractional distillation. The fresh feed stream flow rate is 96 mol/min. The vapor leaving the top of the column, which contains 96 % benzene, is completely condensed and split into two equal fractions: one is removed as the overhead product stream, and the other (the reflux) is recycled to the top of the column. The overhead product stream contains 88% of the benzene fed to the column. The liquid leaving the bottom of the column is fed to a partial reboiler in which 47% of the liquid is vaporized. The vapor generated in the reboiler (the boil up) is recycled to the column to become the rising vapor stream in the column, and the residual reboiler liquid is removed as the bottom product stream. The relation that governs the composition of the streams leaving the reboiler is YB = 2.25XB, where yB and xB are the mole fractions of benzene in the vapor and liquid streams, respectively. Draw and completely label a flowchart of the separation process. Calculate the molar flowrates of the overhead and bottom products, the mole fraction of benzene in the bottom products, and the molar flowarate of boil-up and its corresponding mole fraction of benzene. Given & Required: Feed= Component Benzene Toluene Overhead Benzene Toluene Bottoms = YB Recycled Recovery Recycled 96 mol/hr Wt % 54% 46% ? W1% 96% 4% ? 2.25XB 50% 88% 47% Required: a. O and B b. XBb c. Molar flowrate of boil-up and its corresponding YB Notes: Show DF Analysis
A feed to a distillation column consisting of 54 wt% benzene and 46 wt% toluene is separated into two product streams by fractional distillation. The fresh feed stream flow rate is 96 mol/min. The vapor leaving the top of the column, which contains 96 % benzene, is completely condensed and split into two equal fractions: one is removed as the overhead product stream, and the other (the reflux) is recycled to the top of the column. The overhead product stream contains 88% of the benzene fed to the column. The liquid leaving the bottom of the column is fed to a partial reboiler in which 47% of the liquid is vaporized. The vapor generated in the reboiler (the boil up) is recycled to the column to become the rising vapor stream in the column, and the residual reboiler liquid is removed as the bottom product stream. The relation that governs the composition of the streams leaving the reboiler is YB = 2.25XB, where yB and xB are the mole fractions of benzene in the vapor and liquid streams, respectively. Draw and completely label a flowchart of the separation process. Calculate the molar flowrates of the overhead and bottom products, the mole fraction of benzene in the bottom products, and the molar flowarate of boil-up and its corresponding mole fraction of benzene. Given & Required: Feed= Component Benzene Toluene Overhead Benzene Toluene Bottoms = YB Recycled Recovery Recycled 96 mol/hr Wt % 54% 46% ? W1% 96% 4% ? 2.25XB 50% 88% 47% Required: a. O and B b. XBb c. Molar flowrate of boil-up and its corresponding YB Notes: Show DF Analysis
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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Transcribed Image Text:A feed to a distillation column consisting of 54 wt% benzene and 46 wt% toluene is
separated into two product streams by fractional distillation. The fresh feed stream flow
rate is 96 mol/min. The vapor leaving the top of the column, which contains 96 w%
benzene, is completely condensed and split into two equal fractions: one is removed as
the overhead product stream, and the other (the reflux) is recycled to the top of the
column. The overhead product stream contains 88% of the benzene fed to the column.
The liquid leaving the bottom of the column is fed to a partial reboiler in which 47% of the
liquid is vaporized. The vapor generated in the reboiler (the boil up) is recycled to the
column to become the rising vapor stream in the column, and the residual reboiler liquid
is removed as the bottom product stream. The relation that governs the composition of
the streams leaving the reboiler is YB = 2.25XB, where yB and xB are the mole fractions of
benzene in the vapor and liquid streams, respectively. Draw and completely label a
flowchart of the separation process. Calculate the molar flowrates of the overhead and
bottom products, the mole fraction of benzene in the bottom products, and the molar
flowarate of boil-up and its corresponding mole fraction of benzene.
Given & Required:
Feed =
Component
Benzene
Toluene
Overhead =
Benzene
Toluene
Bottoms =
YB
Recycled
Recovery
Recycled
96 mol/hr
Wt%
54%
46%
?
Wt%
96%
4%
?
2.25XB
50%
88%
47%
Required:
a. O and B
b. XBb
c. Molar flowrate of boil-up and its
corresponding YB
Notes:
Show DF Analysis
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