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Problem 4. A benzene-air mixture is to be scrubbed in a simple counter-current absorption tower using a non-volatile hydrocarbon oil as solvent. The inlet gas contains 5% benzene and the enriching gas flow is 600 kmol/hr. Solubility of benzene in oil follows Raoult's Law. The tower operates isothermally at 80°F. The average molecular weight of oil is 200 and the pressure is 1 atm. [PC,H, = 103 mm Hg at 80°F.] (a) Calculate the minimum liquid flow rate needed to recover 90% of the entering benzene. (b) Calculate the theoretical stages required if Qal=1.5QL

Problem 4. A benzene-air mixture is to be scrubbed in a simple counter-current absorption tower using a non-volatile hydrocarbon oil as solvent. The inlet gas contains 5% benzene and the enriching gas flow is 600 kmol/hr. Solubility of benzene in oil follows Raoult's Law. The tower operates isothermally at 80°F. The average molecular weight of oil is 200 and the pressure is 1 atm. [PC,H, = 103 mm Hg at 80°F.] (a) Calculate the minimum liquid flow rate needed to recover 90% of the entering benzene. (b) Calculate the theoretical stages required if Qal=1.5QL

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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Problem 4. A benzene-air mixture is to be scrubbed in a simple counter-current absorption tower using a non-volatile hydrocarbon oil as solvent. The inlet gas contains 5% benzene and the enriching gas flow is 600 kmol/hr. Solubility of benzene in oil follows Raoult's Law. The tower operates isothermally at 80°F. The average molecular weight of oil is 200 and the pressure is 1 atm. [PcH, = 103 mm Hg at 80°F.] (a) Calculate the minimum liquid flow rate needed to recover 90% of the entering benzene. (b) Calculate the theoretical stages required if Qactual 1.5Q minimum
Transcribed Image Text:Problem 4. A benzene-air mixture is to be scrubbed in a simple counter-current absorption tower using a non-volatile hydrocarbon oil as solvent. The inlet gas contains 5% benzene and the enriching gas flow is 600 kmol/hr. Solubility of benzene in oil follows Raoult's Law. The tower operates isothermally at 80°F. The average molecular weight of oil is 200 and the pressure is 1 atm. [PcH, = 103 mm Hg at 80°F.] (a) Calculate the minimum liquid flow rate needed to recover 90% of the entering benzene. (b) Calculate the theoretical stages required if Qactual 1.5Q minimum
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