1) Vaporization of Multicomponent Alcohol Mixtures and (Single-Stage) Flash Distillation The vapor-pressure at 101.325 kPa (760 mm Hg) is available for several alcohols: Vapor Pressure (mm Hg) T(°C) Methanol (MeOH) Ethanol (ETOH) n-Propanol (NPOH) n-Butanol (NBOH) 50 415 220.0 88.9 33.7 60 629 351.5 148.9 59.2 65 767 438 190.1 77.7 70 929 542 240.6 99.6 75 1119 665 301.9 131.3 80 1339 812 376 165.0 85 1593 984 465 206.1 90 1884 1185 571 225.9 100 2598 1706 843 387.6 An alcohol feed mixture at 101.325kPa (760 mmHg) consisting of 20 % methanol, 25% ethanol, 20% n- propyl alcohol and 35% n-butyl alcohol is to be fed to a distillation column. Calculate the following assuming the mixture follows Raoult's Law: a) The boiling point and composition of the vapor in equilibrium. b) The dew point and composition of the liquid in equilibrium. c) The temperature and composition of both phases if 40.0% of the feed is vaporized in a flash distillation (e.g., a single 'stage' vapor-liquid separation)
1) Vaporization of Multicomponent Alcohol Mixtures and (Single-Stage) Flash Distillation The vapor-pressure at 101.325 kPa (760 mm Hg) is available for several alcohols: Vapor Pressure (mm Hg) T(°C) Methanol (MeOH) Ethanol (ETOH) n-Propanol (NPOH) n-Butanol (NBOH) 50 415 220.0 88.9 33.7 60 629 351.5 148.9 59.2 65 767 438 190.1 77.7 70 929 542 240.6 99.6 75 1119 665 301.9 131.3 80 1339 812 376 165.0 85 1593 984 465 206.1 90 1884 1185 571 225.9 100 2598 1706 843 387.6 An alcohol feed mixture at 101.325kPa (760 mmHg) consisting of 20 % methanol, 25% ethanol, 20% n- propyl alcohol and 35% n-butyl alcohol is to be fed to a distillation column. Calculate the following assuming the mixture follows Raoult's Law: a) The boiling point and composition of the vapor in equilibrium. b) The dew point and composition of the liquid in equilibrium. c) The temperature and composition of both phases if 40.0% of the feed is vaporized in a flash distillation (e.g., a single 'stage' vapor-liquid separation)
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:1) Vaporization of Multicomponent Alcohol Mixtures and (Single-Stage) Flash Distillation
The vapor-pressure at 101.325 kPa (760 mm Hg) is available for several alcohols:
Vapor Pressure (mm Hg)
T (°C)
Methanol (MeOH)
Ethanol (ETOH)
n-Propanol (NPOH)
n-Butanol (NBOH)
50
415
220.0
88.9
33.7
60
629
351.5
148.9
59.2
65
767
438
190.1
77.7
70
929
542
240.6
99.6
75
1119
665
301.9
131.3
80
1339
812
376
165.0
85
1593
984
465
206.1
90
1884
1185
571
225.9
100
2598
1706
843
387.6
An alcohol feed mixture at 101.325kPa (760 mmHg) consisting of 20 % methanol, 25% ethanol, 20% n-
propyl alcohol and 35% n-butyl alcohol is to be fed to a distillation column.
Calculate the following assuming the mixture follows Raoult’s Law:
a) The boiling point and composition of the vapor in equilibrium.
b) The dew point and composition of the liquid in equilibrium.
c) The temperature and composition of both phases if 40.0% of the feed is
vaporized in a flash distillation (e.g., a single 'stage' vapor-liquid separation)
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