2. 100 mol/hr of an ethanol/H₂O mixture containing 10 mol% ethanol is to be produced as the liquid outlet stream from an isothermal (T-78.15°C) flash unit. The feed stream is 30 mol% ethanol. At 78.15°C the liquid mixture of ethanol(1)/water(2) is adequately described by the following van Laar equations for the activity coefficients: In y₁= A12 In y2 = A21 A21x2 A12X1 + A21x24 A12x1 A12X1 + A21X24 2 2 A12 = 1.6798 A21 = 0.9227 Assume that the vapor phase behaves as an ideal gas and that the fugacities of pure ethanol and water are independent of pressure (i.e., that it is appropriate to use modified Raoult's law).
2. 100 mol/hr of an ethanol/H₂O mixture containing 10 mol% ethanol is to be produced as the liquid outlet stream from an isothermal (T-78.15°C) flash unit. The feed stream is 30 mol% ethanol. At 78.15°C the liquid mixture of ethanol(1)/water(2) is adequately described by the following van Laar equations for the activity coefficients: In y₁= A12 In y2 = A21 A21x2 A12X1 + A21x24 A12x1 A12X1 + A21X24 2 2 A12 = 1.6798 A21 = 0.9227 Assume that the vapor phase behaves as an ideal gas and that the fugacities of pure ethanol and water are independent of pressure (i.e., that it is appropriate to use modified Raoult's law).
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:2. 100 mol/hr of an ethanol/H₂O mixture containing 10 mol% ethanol is to be produced as the
liquid outlet stream from an isothermal (T-78.15°C) flash unit. The feed stream is 30 mol%
ethanol.
At 78.15°C the liquid mixture of ethanol(1)/water (2) is adequately described by the following van
Laar equations for the activity coefficients:
In Y₁ = A12
A21x2
(A₁
A12X1 + A21x2.
A12X1
In y2 = A21 A₁2x₁ + A₂1X24
A12X1
2
2
A12 = 1.6798
A21 = 0.9227
Assume that the vapor phase behaves as an ideal gas and that the fugacities of pure ethanol and
water are independent of pressure (i.e., that it is appropriate to use modified Raoult's law).
Transcribed Image Text:At 78.15°C the saturation pressure of
pure water is 329 mm Hg.
Determine:
(i)
(ii)
(iii)
pure ethanol is 755 mm Hg and the saturation pressure of
the outlet pressure at which the flash must be operated.
the composition of the vapor stream.
the flow rates of the feed and vapor streams.
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