Calculate the relative volatility of methanol to water, αmw, for a binary mixture at a pressure of 1 atm, with a methanol mole-fraction of 0.9 in the liquid phase, using three methods; a) reading values from the chart above; b) assuming an ideal liquid; c) using the Margules equation for the liquid phase activity coefficients. Compare the results and explain your findings. feedback to help with ques Again, iteration was required to find the composition of the vapour, both for the assumption of ideal solution behaviour and accounting for the non-ideality using Margules coefficients. Again, the value from read from the graph is approximate but it should be clear that it agrees better with the nonideal calculation. ans = Q3b) αmw=4.10; c) αmw=2.46
Calculate the relative volatility of methanol to water, αmw, for a binary mixture at a pressure of 1 atm, with a methanol mole-fraction of 0.9 in the liquid phase, using three methods; a) reading values from the chart above; b) assuming an ideal liquid; c) using the Margules equation for the liquid phase activity coefficients. Compare the results and explain your findings. feedback to help with ques Again, iteration was required to find the composition of the vapour, both for the assumption of ideal solution behaviour and accounting for the non-ideality using Margules coefficients. Again, the value from read from the graph is approximate but it should be clear that it agrees better with the nonideal calculation. ans = Q3b) αmw=4.10; c) αmw=2.46
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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3) Calculate the relative volatility of methanol to water, αmw, for a binary mixture at a pressure of 1 atm, with a methanol mole-fraction of 0.9 in the liquid phase, using three methods; a) reading values from the chart above; b) assuming an ideal liquid; c) using the Margules equation for the liquid phase activity coefficients. Compare the results and explain your findings.
feedback to help with ques Again, iteration was required to find the composition of the vapour, both for the assumption of ideal solution behaviour and accounting for the non-ideality using Margules coefficients. Again, the value from read from the graph is approximate but it should be clear that it agrees better with the nonideal calculation.
ans = Q3b) αmw=4.10; c) αmw=2.46
Transcribed Image Text:Ym (molefraction of methanol in vapour)
0.8
0.6
0.4
0.2
0
0
x-y diagram for methanol/water at 1 atm
0.2
0.4
Xm (molefraction of methanol in liquid)
0.6
0.8
1
Transcribed Image Text:Data:
Antoine coefficients (P in mmHg, Tin K, log to base e):
Methanol: A = 18.588, B = 3626.6, C = -34.29
Water: A = 18.304, B = 3816.4, C = -46.13
Ethanol: A = 18.9119, B = 3803.98, C = -41.68
Margules parameters:
Methanol-Water: Awm = 0.6174, Amw = 0.7279
Ethanol-Water: Awe = 0.7917, Aew = 1.6366
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