A vapor stream containing 3.0 mole percent benzene is scrubbed with wash oil in a packed absorber to reduce the benzene concentration in the gas to 0.02 percent. The oil has an average molecular weight of about 250 and a density of 54.6 lb/ft and contains 0.015 percent benzene. The gas flow is 1,500 ft/min at 25°C and 1 atm. (a) If the scrubber operates isothermally at 25°C with a liquid rate of 14,000 lb/h, how many transfer units are required? (b) If the scrubber operates adiabatically, how many transfer units are needed? (c) What would be the major effect of operating with an oil of lower molecular weight, say, M = 200?
A vapor stream containing 3.0 mole percent benzene is scrubbed with wash oil in a packed absorber to reduce the benzene concentration in the gas to 0.02 percent. The oil has an average molecular weight of about 250 and a density of 54.6 lb/ft and contains 0.015 percent benzene. The gas flow is 1,500 ft/min at 25°C and 1 atm. (a) If the scrubber operates isothermally at 25°C with a liquid rate of 14,000 lb/h, how many transfer units are required? (b) If the scrubber operates adiabatically, how many transfer units are needed? (c) What would be the major effect of operating with an oil of lower molecular weight, say, M = 200?
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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A vapor stream containing 3.0 mole percent benzene is scrubbed with wash oil in a packed absorber to reduce the benzene concentration in the gas to 0.02 percent. The oil has an average molecular weight of about 250 and a density of 54.6 lb/ft and contains 0.015 percent benzene. The gas flow is 1,500 ft/min at 25°C and 1 atm.
(a) If the scrubber operates isothermally at 25°C with a liquid rate of 14,000 lb/h, how many transfer units are required? (b) If the scrubber operates adiabatically, how many transfer units are needed? (c) What would be the major effect of operating with
an oil of lower molecular weight, say, M = 200?
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