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(a) Draw a flowsheet for the two alternatives. Confirm 1.6 mol% A in the product gas from tower 1. (b) If the product stream of tower 1 produces 1.6 mol% A, what is the concentration of A in the product gas from tower 2?

(a) Draw a flowsheet for the two alternatives. Confirm 1.6 mol% A in the product gas from tower 1. (b) If the product stream of tower 1 produces 1.6 mol% A, what is the concentration of A in the product gas from tower 2?

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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i need solution of part a and b only

A gas stream of 1 mol s-1 contains 4 mol% of component A. This should be reduced to 0.1 mol% in an absorption tower using 6 mol s-1 pure water. While the tower is very tall, the fraction of A in the gas product remains too high (about 1.6 mol%). To further reduce the concentration of A, an identical tower 2 is used in series where the exit qas from tower 1 is treated with 6 mol s-' pure water. However, the desired product of 0.1 mol% A is still not achieved. Data: Henry's law for component A: y = m x, where m = H I P =10 (P = 1 bar is the column pressure). (a) Draw a flowsheet for the two alternatives. Confirm 1.6 mol% A in the product gas from tower 1. (b) If the product stream of tower 1 produces 1.6 mol% A, what is the concentration of A in the product gas from tower 2? (c) Consider the option of using all the water (12 mol s-1) in tower 1, leaving tower 2 as a spare. Explain why this would work, and find the exit gas concentration of A in this case (guide maximum 100 words). (d) You are allowed to operate tower 2 at a higher liquid molar flowrate than 12 mol s-1. How tall the tower 2 has to be to achieve 1 mol% of A in the product stream.? Assume that the diameter of the tower is 0.6 m and the product of mass transfer coefficient and surface area per unit volume is 2.45 x 10-6 mol cm-3s-1.
Transcribed Image Text:A gas stream of 1 mol s-1 contains 4 mol% of component A. This should be reduced to 0.1 mol% in an absorption tower using 6 mol s-1 pure water. While the tower is very tall, the fraction of A in the gas product remains too high (about 1.6 mol%). To further reduce the concentration of A, an identical tower 2 is used in series where the exit qas from tower 1 is treated with 6 mol s-' pure water. However, the desired product of 0.1 mol% A is still not achieved. Data: Henry's law for component A: y = m x, where m = H I P =10 (P = 1 bar is the column pressure). (a) Draw a flowsheet for the two alternatives. Confirm 1.6 mol% A in the product gas from tower 1. (b) If the product stream of tower 1 produces 1.6 mol% A, what is the concentration of A in the product gas from tower 2? (c) Consider the option of using all the water (12 mol s-1) in tower 1, leaving tower 2 as a spare. Explain why this would work, and find the exit gas concentration of A in this case (guide maximum 100 words). (d) You are allowed to operate tower 2 at a higher liquid molar flowrate than 12 mol s-1. How tall the tower 2 has to be to achieve 1 mol% of A in the product stream.? Assume that the diameter of the tower is 0.6 m and the product of mass transfer coefficient and surface area per unit volume is 2.45 x 10-6 mol cm-3s-1.
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