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Consider the following bubble point feed stream with components A, B and C for separation by distillation using either a direct sequence or an indirect sequence, as shown below: A, B, C B B, C A, B, C A, B C αk/c Fk (gmol/s) A 5.5 B 2.0 C 1.0 333 30 40 30 B Direct Sequence Indirect Sequence Our goal is to select the best sequence for an overall recovery of 95% for each component. To do so, we have to express the material balances and calculate the component flows in all streams. a well-designed system will have to meet the overall recovery specifications exactly. Therefore, any design (i.e., vector of flows) for both sequences can be determined based on the recovery of B in the first column. a) b) Using this insight, develop equations to calculate the theoretical number of trays in the two columns of the direct sequence. Use these two equations (or a combination of them) to find the optimal recovery of B in the first column (you can do that by simply drawing the function). Repeat part (a) for the indirect sequence.

Consider the following bubble point feed stream with components A, B and C for separation by distillation using either a direct sequence or an indirect sequence, as shown below: A, B, C B B, C A, B, C A, B C αk/c Fk (gmol/s) A 5.5 B 2.0 C 1.0 333 30 40 30 B Direct Sequence Indirect Sequence Our goal is to select the best sequence for an overall recovery of 95% for each component. To do so, we have to express the material balances and calculate the component flows in all streams. a well-designed system will have to meet the overall recovery specifications exactly. Therefore, any design (i.e., vector of flows) for both sequences can be determined based on the recovery of B in the first column. a) b) Using this insight, develop equations to calculate the theoretical number of trays in the two columns of the direct sequence. Use these two equations (or a combination of them) to find the optimal recovery of B in the first column (you can do that by simply drawing the function). Repeat part (a) for the indirect sequence.

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
Problem 1.1P
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Consider the following bubble point feed stream with components A, B and C for separation by distillation using either a direct sequence or an indirect sequence, as shown below: A, B, C B B, C A, B, C A, B C αk/c Fk (gmol/s) A 5.5 B 2.0 C 1.0 333 30 40 30 B Direct Sequence Indirect Sequence Our goal is to select the best sequence for an overall recovery of 95% for each component. To do so, we have to express the material balances and calculate the component flows in all streams. a well-designed system will have to meet the overall recovery specifications exactly. Therefore, any design (i.e., vector of flows) for both sequences can be determined based on the recovery of B in the first column. a) b) Using this insight, develop equations to calculate the theoretical number of trays in the two columns of the direct sequence. Use these two equations (or a combination of them) to find the optimal recovery of B in the first column (you can do that by simply drawing the function). Repeat part (a) for the indirect sequence.
Transcribed Image Text:Consider the following bubble point feed stream with components A, B and C for separation by distillation using either a direct sequence or an indirect sequence, as shown below: A, B, C B B, C A, B, C A, B C αk/c Fk (gmol/s) A 5.5 B 2.0 C 1.0 333 30 40 30 B Direct Sequence Indirect Sequence Our goal is to select the best sequence for an overall recovery of 95% for each component. To do so, we have to express the material balances and calculate the component flows in all streams. a well-designed system will have to meet the overall recovery specifications exactly. Therefore, any design (i.e., vector of flows) for both sequences can be determined based on the recovery of B in the first column. a) b) Using this insight, develop equations to calculate the theoretical number of trays in the two columns of the direct sequence. Use these two equations (or a combination of them) to find the optimal recovery of B in the first column (you can do that by simply drawing the function). Repeat part (a) for the indirect sequence.
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