Example 3.8: A rectification column is fed 100 kg mol/h of a mixture of 50 mol % benzene and 50 mol % toluene at 101.32 kPa abs pressure. The feed is saturated vapor at the dew point.. The distillate is to contain 90 mol % benzene and the bottoms 10 mol % benzene. Calculate the following. (a) Minimum reflux ratio Rm,. (b) Minimum number of theoretical plates at total reflux. (c) Theoretical number of trays at an operating reflux ratio of 1.5(Rm)
Example 3.8: A rectification column is fed 100 kg mol/h of a mixture of 50 mol % benzene and 50 mol % toluene at 101.32 kPa abs pressure. The feed is saturated vapor at the dew point.. The distillate is to contain 90 mol % benzene and the bottoms 10 mol % benzene. Calculate the following. (a) Minimum reflux ratio Rm,. (b) Minimum number of theoretical plates at total reflux. (c) Theoretical number of trays at an operating reflux ratio of 1.5(Rm)
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:Example 3.8: A rectification column is fed 100 kg mol/h of a mixture of 50 mol % benzene and
50 mol % toluene at 101.32 kPa abs pressure. The feed is saturated vapor at the dew point.. The
distillate is to contain 90 mol % benzene and the bottoms 10 mol % benzene. Calculate the
following.
(a) Minimum reflux ratio Rm,.
(b) Minimum number of theoretical plates at total reflux.
(c) Theoretical number of trays at an operating reflux ratio of 1.5(Rm)
Solution
Xd
= 0.31, Rm = 1.9, R = 1.5 Rm = 2.85
Rm+1
q-Line
1. (Xf, Xf) = (0.5 , 0.5)
2. q = 0 (horizontal)
TOL
1)
(xd , xd ) = (0.9 , 0.9)
Xd
0.9
2)
= 0.23
R+1
2.85+1
BOL
1. (Xw, Xw) = ( 0.1 , 0.1)
2. Intersection of TOL and q-line
Number of stage = 7.8 , Number of plates = 6.8 and feed is introduced on tray 5 from top.
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