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4.8. WP A distillation column is a process unit in which a feed mixture is separated by multiple partial vaporizations and condensations to form two or more product streams. The overhead product stream is rich in the most volatile components of the feed mixture (the ones that vaporize most readily), and the bottom product stream is rich in the least volatile components. The following flowchart shows a distillation column with two feed streams and three product streams: Stream 3 m3(kg A/h) Stream 1 m (kgh) 0.03 kg B/kg 0.97 kg C/kg Stream 4 1200 kg/h 0.70 kg A/kg X4B(kg B/kg) Xạc(kg C/kg) Stream 2 5300 kg/h X2a(kg A/kg) XB(kg B/kg) Stream 5 mg(kg/h) 0.60 kg B/kg 0.40 kg C/kg a. How many independent material balances may be written for this system? (> Answer b. How many of the unknown flow rates and/or mole fractions must be specified before the others may be calculated? (See Example 4.3-4. Also, remember what you know about the component mole fractions of a mixture-for example, the relationship between x2Ą and x,B·) Briefly explain your answer. c. Suppose values are given for m, and x24. Give a series of equations, each involving only a single unknown, for the remaining variables. Circle the variable for which you would solve. (Once a variable has been calculated in one of these equations, it may appear in subsequent equations without being counted as an unknown.)

4.8. WP A distillation column is a process unit in which a feed mixture is separated by multiple partial vaporizations and condensations to form two or more product streams. The overhead product stream is rich in the most volatile components of the feed mixture (the ones that vaporize most readily), and the bottom product stream is rich in the least volatile components. The following flowchart shows a distillation column with two feed streams and three product streams: Stream 3 m3(kg A/h) Stream 1 m (kgh) 0.03 kg B/kg 0.97 kg C/kg Stream 4 1200 kg/h 0.70 kg A/kg X4B(kg B/kg) Xạc(kg C/kg) Stream 2 5300 kg/h X2a(kg A/kg) XB(kg B/kg) Stream 5 mg(kg/h) 0.60 kg B/kg 0.40 kg C/kg a. How many independent material balances may be written for this system? (> Answer b. How many of the unknown flow rates and/or mole fractions must be specified before the others may be calculated? (See Example 4.3-4. Also, remember what you know about the component mole fractions of a mixture-for example, the relationship between x2Ą and x,B·) Briefly explain your answer. c. Suppose values are given for m, and x24. Give a series of equations, each involving only a single unknown, for the remaining variables. Circle the variable for which you would solve. (Once a variable has been calculated in one of these equations, it may appear in subsequent equations without being counted as an unknown.)

Introduction to Chemical Engineering Thermodynamics
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
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4.8. WP A distillation column is a process unit in which a feed mixture is separated by multiple partial vaporizations and condensations to form two or more product streams. The overhead product stream is rich in the most volatile components of the feed mixture (the ones that vaporize most readily), and the bottom product stream is rich in the least volatile components. The following flowchart shows a distillation column with two feed streams and three product streams: Stream 3 m3(kg A/h) Stream 1 m (kgh) 0.03 kg B/kg 0.97 kg C/kg Stream 4 1200 kg/h 0.70 kg A/kg X4B(kg B/kg) Xạc(kg C/kg) Stream 2 5300 kg/h X2a(kg A/kg) XB(kg B/kg) Stream 5 mg(kg/h) 0.60 kg B/kg 0.40 kg C/kg a. How many independent material balances may be written for this system? (> Answer b. How many of the unknown flow rates and/or mole fractions must be specified before the others may be calculated? (See Example 4.3-4. Also, remember what you know about the component mole fractions of a mixture-for example, the relationship between x2Ą and x,B·) Briefly explain your answer. c. Suppose values are given for m, and x24. Give a series of equations, each involving only a single unknown, for the remaining variables. Circle the variable for which you would solve. (Once a variable has been calculated in one of these equations, it may appear in subsequent equations without being counted as an unknown.)
Transcribed Image Text:4.8. WP A distillation column is a process unit in which a feed mixture is separated by multiple partial vaporizations and condensations to form two or more product streams. The overhead product stream is rich in the most volatile components of the feed mixture (the ones that vaporize most readily), and the bottom product stream is rich in the least volatile components. The following flowchart shows a distillation column with two feed streams and three product streams: Stream 3 m3(kg A/h) Stream 1 m (kgh) 0.03 kg B/kg 0.97 kg C/kg Stream 4 1200 kg/h 0.70 kg A/kg X4B(kg B/kg) Xạc(kg C/kg) Stream 2 5300 kg/h X2a(kg A/kg) XB(kg B/kg) Stream 5 mg(kg/h) 0.60 kg B/kg 0.40 kg C/kg a. How many independent material balances may be written for this system? (> Answer b. How many of the unknown flow rates and/or mole fractions must be specified before the others may be calculated? (See Example 4.3-4. Also, remember what you know about the component mole fractions of a mixture-for example, the relationship between x2Ą and x,B·) Briefly explain your answer. c. Suppose values are given for m, and x24. Give a series of equations, each involving only a single unknown, for the remaining variables. Circle the variable for which you would solve. (Once a variable has been calculated in one of these equations, it may appear in subsequent equations without being counted as an unknown.)
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