Show your complete solution to the questions given below. State all assumptions used during the Draw relevant figures, if necessary. Do not round off during your calculations. Unless otherwise specified, express your final answer/s to the nearest four decimal If it is a very small/very large number, express your final answer/s in scientific notation to the nearest two decimal places. Box your final answers. Your answer is not considered final if it is not enclosed in a PROBLEM 1   A benzene-air mixture is to be scrubbed in a simple counter-current absorption tower using a non- volatile absorption oil as solvent. The inlet gas contains 5% benzene and the entering gas flow is 600 lbmol/h. Solubility of benzene in oil follows Raoult’s law. The tower operates isothermally at 80°F and the average molecular weight of the oil is 200 and the tower pressure is 1 atm.   What is the minimum oil (lb/h) needed to recover 90% of the entering benzene? How many theoretical stages are required if the oil rate is 5 times the minimum? If the overall gas-phase mass transfer coefficient is 2 lbmol/h-ft3 and the diameter of a packed tower is 5 m, how many meters is the height of the tower required?

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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  1. Show your complete solution to the questions given below. State all assumptions used during the Draw relevant figures, if necessary.
  2. Do not round off during your calculations. Unless otherwise specified, express your final answer/s to the nearest four decimal If it is a very small/very large number, express your final answer/s in scientific notation to the nearest two decimal places.
  3. Box your final answers. Your answer is not considered final if it is not enclosed in a

PROBLEM 1

 

A benzene-air mixture is to be scrubbed in a simple counter-current absorption tower using a non- volatile absorption oil as solvent. The inlet gas contains 5% benzene and the entering gas flow is 600 lbmol/h. Solubility of benzene in oil follows Raoult’s law. The tower operates isothermally at 80°F and the average molecular weight of the oil is 200 and the tower pressure is 1 atm.

 

  • What is the minimum oil (lb/h) needed to recover 90% of the entering benzene?
  • How many theoretical stages are required if the oil rate is 5 times the minimum?
  • If the overall gas-phase mass transfer coefficient is 2 lbmol/h-ft3 and the diameter of a packed tower is 5 m, how many meters is the height of the tower required?

 

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