A total feed of 100 hr kmole having an overall composition of 45 mol % toluene and 55 mol % benzene is to be fractionated at 101.3 kPa pressure to give a distillate containing 95 mol % benzene and a bottoms containing 2 mol % benzene. The feed enters the tower partially vaporized so that 60 mol % is liquid and 40 mol % vapor. Equilibrium data are given in table 1. Calculate the following: (A,hg = 390.A,h7 = 351 kg • The mole rate of distillate and bottom products. • Minimum reflux ratio Rm. • Minimum steps and theoretical trays at total reflux. • Theoretical number of trays required for an operating reflux ratio of 2.5Rm- • Calculate the rate of steam requirement in the reboiler. Note that steam pressure is 0.4 MPa. • Calculate the cooling water rate in a total condenser used in this distillation unit. Note that the cooling water experiences 30°F rising in temperature. Table 1. Equilibrium Data X 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 y 0.2003 0.3622 0.4948 0.6049 0.6974 0.7762 | 0.8439 0.9028 0.9544 1
A total feed of 100 hr kmole having an overall composition of 45 mol % toluene and 55 mol % benzene is to be fractionated at 101.3 kPa pressure to give a distillate containing 95 mol % benzene and a bottoms containing 2 mol % benzene. The feed enters the tower partially vaporized so that 60 mol % is liquid and 40 mol % vapor. Equilibrium data are given in table 1. Calculate the following: (A,hg = 390.A,h7 = 351 kg • The mole rate of distillate and bottom products. • Minimum reflux ratio Rm. • Minimum steps and theoretical trays at total reflux. • Theoretical number of trays required for an operating reflux ratio of 2.5Rm- • Calculate the rate of steam requirement in the reboiler. Note that steam pressure is 0.4 MPa. • Calculate the cooling water rate in a total condenser used in this distillation unit. Note that the cooling water experiences 30°F rising in temperature. Table 1. Equilibrium Data X 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 y 0.2003 0.3622 0.4948 0.6049 0.6974 0.7762 | 0.8439 0.9028 0.9544 1
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:kmole
A total feed of 100
hr
having an overall composition of 45 mol % toluene and 55 mol %
benzene is to be fractionated at 101.3 kPa pressure to give a distillate containing 95 mol % benzene
and a bottoms containing 2 mol % benzene. The feed enters the tower partially vaporized so that
60 mol % is liquid and 40 mol % vapor. Equilibrium data are given in table 1. Calculate the
following: (A,hg = 390.A,h,
kJ
= 351
• The mole rate of distillate and bottom products.
• Minimum reflux ratio Rm.
• Minimum steps and theoretical trays at total reflux.
• Theoretical number of trays required for an operating reflux ratio of 2.5Rm-.
• Calculate the rate of steam requirement in the reboiler. Note that steam pressure is 0.4 MPa.
Calculate the cooling water rate in a total condenser used in this distillation unit. Note that
the cooling water experiences 30°F rising in temperature.
Table 1. Equilibrium Data
X
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
0.2003 0.3622 0.4948
0.6049 0.6974 0.7762
0.8439
0.9028
0.9544
1
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