Problem 2. An absorber-stripper system is used to recover benzene (B) from a gas, with oil as the absorbent and steam as the stripping agent. 90% of the benzene in 100 mol/h of an inlet gas (0.06 mol B /mol gas) is recovered in the absorber. The oil entering the absorber contains 0.01 mol B /mol oil, and when exiting the absorber it contains 0.19 mol B /mol oil. In the stripper, the oil enters with 0.19 mol B/mol oil, and exits with 0.01 mol B /mol oil, and the steam enters benzene-free. Later, the benzene/steam mixture is cooled to easily separate benzene from water. The absorber operates at 25 °C and the stripper at 110 °C, with the equilibrium data given below: X in Oil Y in Gas (25 °C) 0 0 0.04 0.08 0.12 0.16 0.20 0.24 0.28 0.011 0.0215 0.032 0.042 0.0515 0.060 0.068 Y in Steam (110 °C) 0 0.10 0.21 0.33 0.47 0.62 0.795 1.05 a) Draw a block-flow diagram of the described system and label what species are present in each stream. Include only the separation units. b) What is the ratio of benzene-free oil to benzene-free gas flow rates in the absorber? c) How many theoretical equilibrium stages does the absorber need?
Problem 2. An absorber-stripper system is used to recover benzene (B) from a gas, with oil as the absorbent and steam as the stripping agent. 90% of the benzene in 100 mol/h of an inlet gas (0.06 mol B /mol gas) is recovered in the absorber. The oil entering the absorber contains 0.01 mol B /mol oil, and when exiting the absorber it contains 0.19 mol B /mol oil. In the stripper, the oil enters with 0.19 mol B/mol oil, and exits with 0.01 mol B /mol oil, and the steam enters benzene-free. Later, the benzene/steam mixture is cooled to easily separate benzene from water. The absorber operates at 25 °C and the stripper at 110 °C, with the equilibrium data given below: X in Oil Y in Gas (25 °C) 0 0 0.04 0.08 0.12 0.16 0.20 0.24 0.28 0.011 0.0215 0.032 0.042 0.0515 0.060 0.068 Y in Steam (110 °C) 0 0.10 0.21 0.33 0.47 0.62 0.795 1.05 a) Draw a block-flow diagram of the described system and label what species are present in each stream. Include only the separation units. b) What is the ratio of benzene-free oil to benzene-free gas flow rates in the absorber? c) How many theoretical equilibrium stages does the absorber need?
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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Transcribed Image Text:Problem 2. An absorber-stripper system is used to recover benzene (B) from a gas, with oil as
the absorbent and steam as the stripping agent. 90% of the benzene in 100 mol/h of an inlet gas
(0.06 mol B /mol gas) is recovered in the absorber. The oil entering the absorber contains 0.01
mol B/mol oil, and when exiting the absorber it contains 0.19 mol B /mol oil. In the stripper,
the oil enters with 0.19 mol B/mol oil, and exits with 0.01 mol B / mol oil, and the steam enters
benzene-free. Later, the benzene/steam mixture is cooled to easily separate benzene from water.
The absorber operates at 25 °C and the stripper at 110 °C, with the equilibrium data given below:
X in Oil Y in Gas (25 °C) Y in Steam (110 °C)
0
0
0
0.04
0.08
0.12
0.16
0.20
0.24
0.28
0.011
0.0215
0.032
0.042
0.0515
0.060
0.068
0.10
0.21
0.33
0.47
0.62
0.795
1.05
a) Draw a block-flow diagram of the described system and label what species are present in each
stream. Include only the separation units.
b) What is the ratio of benzene-free oil to benzene-free gas flow rates in the absorber?
c) How many theoretical equilibrium stages does the absorber need?
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