(High purity product; use of Kremser equation) An equimolar mixture of A and B is to be separated in a tray tower. A top product having 95 mol% A is acceptable. However, a very pure bottom product having not more than 0.1 mol% A is required. The feed is liquid at its bubble point. A reflux ratio of 2.0 is suggested. The relative volatility of A with respect to B is aAR = 2.2. Determine the number of ideal stages. The graphical construction of stages is difficult at low concentration and an algebraic method is convenient. Use the McCabe-Thiele method to make stage construction up to about 5 mol% of A. Then use the Kremser equation to determine the number of trays required to reach the stipulated value of 0.1 mol% A in the bottom product

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
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B (High purity product; use of Kremser equation) An equimolar mixture of A and B
is to be separated in a tray tower. A top product having 95 mol% A is acceptable.
However, a very pure bottom product having not more than 0.1 mol% A is required. The
feed is liquid at its bubble point. A reflux ratio of 2.0 is suggested. The relative volatility
of A with respect to B is CAB
= 2.2. Determine the number of ideal stages.
The graphical construction of stages is difficult at low concentration and an algebraic
method is convenient. Use the McCabe-Thiele method to make stage construction up
to about 5 mol% of A. Then use the Kremser equation to determine the number of trays
required to reach the stipulated value of 0.l mol% A in the bottom product.
Transcribed Image Text:B (High purity product; use of Kremser equation) An equimolar mixture of A and B is to be separated in a tray tower. A top product having 95 mol% A is acceptable. However, a very pure bottom product having not more than 0.1 mol% A is required. The feed is liquid at its bubble point. A reflux ratio of 2.0 is suggested. The relative volatility of A with respect to B is CAB = 2.2. Determine the number of ideal stages. The graphical construction of stages is difficult at low concentration and an algebraic method is convenient. Use the McCabe-Thiele method to make stage construction up to about 5 mol% of A. Then use the Kremser equation to determine the number of trays required to reach the stipulated value of 0.l mol% A in the bottom product.
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