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Calculate the overall conversion, the recycle ratio

Calculate the overall conversion, the recycle ratio

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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Normal butane is catalytically isomerized to isobutane. A fresh feed stream containing pure n-butane at temperature T1 is mixed adiabatically with a recycle stream containing n-butane and isobutane, and the combined stream is fed to the reactor, where some but not all of the n-butane in the feed is converted. The reactor effluent is pumped to a distillation column. The overhead distillation product contains primarily isobutane and a small amount of n-butane. The bottoms product, which also contains both species, is the stream recycled to the reactor. The streams leaving the distillation column are at different temperatures. a) Determine the number of degrees of freedom associated with the feed mixer, the reactor, the distillation column, and the entire process. Include all unknown process stream temperatures and process unit heat duties in your analysis. b) Suppose a single-pass conversion of 35.0% is attained in the reactor, the overhead distillation column product contains 88.5 mole% isobutane, and the recycle stream contains 85.0 mole% n-butane. Calculate the overall conversion, the recycle ratio (mol recycle/mol fresh feed), and the gram-moles of overhead product produced per 100 mol fresh feed. c) Give Outline a manual calculation procedure to determine the compositions of all streams.
Transcribed Image Text:Normal butane is catalytically isomerized to isobutane. A fresh feed stream containing pure n-butane at temperature T1 is mixed adiabatically with a recycle stream containing n-butane and isobutane, and the combined stream is fed to the reactor, where some but not all of the n-butane in the feed is converted. The reactor effluent is pumped to a distillation column. The overhead distillation product contains primarily isobutane and a small amount of n-butane. The bottoms product, which also contains both species, is the stream recycled to the reactor. The streams leaving the distillation column are at different temperatures. a) Determine the number of degrees of freedom associated with the feed mixer, the reactor, the distillation column, and the entire process. Include all unknown process stream temperatures and process unit heat duties in your analysis. b) Suppose a single-pass conversion of 35.0% is attained in the reactor, the overhead distillation column product contains 88.5 mole% isobutane, and the recycle stream contains 85.0 mole% n-butane. Calculate the overall conversion, the recycle ratio (mol recycle/mol fresh feed), and the gram-moles of overhead product produced per 100 mol fresh feed. c) Give Outline a manual calculation procedure to determine the compositions of all streams.
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