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2. You have decided to use a vacuum purging technique to purge oxygen from a reactor vessel to reduce the concentration to 2.0% (mol). The reactor is 18 ft diameter and 40 ft tall. The temperature is 80°F. Assume that the vacuum purge goes from atmospheric pressure to 10.0 psia. How many purge cycles are required and how many total moles of nitrogen must be used? Assume the purge is done with pure nitrogen. 3. If the purging described in problem 2 takes place using nitrogen that has 1% (mol) oxygen in it, how many vacuum purge cycles are required? How many total moles of the inert gas must be used? 4. If the purging described in problem 2 is done by way of a "sweep-through" purge instead of a vacuum purge, for how long (in minutes) must the inert gas flow through the vessel if there is a 20 psig supply of pure nitrogen available at 150 CFM (ft³/min)? How much nitrogen must be used (lbm)?

2. You have decided to use a vacuum purging technique to purge oxygen from a reactor vessel to reduce the concentration to 2.0% (mol). The reactor is 18 ft diameter and 40 ft tall. The temperature is 80°F. Assume that the vacuum purge goes from atmospheric pressure to 10.0 psia. How many purge cycles are required and how many total moles of nitrogen must be used? Assume the purge is done with pure nitrogen. 3. If the purging described in problem 2 takes place using nitrogen that has 1% (mol) oxygen in it, how many vacuum purge cycles are required? How many total moles of the inert gas must be used? 4. If the purging described in problem 2 is done by way of a "sweep-through" purge instead of a vacuum purge, for how long (in minutes) must the inert gas flow through the vessel if there is a 20 psig supply of pure nitrogen available at 150 CFM (ft³/min)? How much nitrogen must be used (lbm)?

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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2. You have decided to use a vacuum purging technique to purge oxygen from a reactor vessel to reduce the concentration to 2.0% (mol). The reactor is 18 ft diameter and 40 ft tall. The temperature is 80°F. Assume that the vacuum purge goes from atmospheric pressure to 10.0 psia. How many purge cycles are required and how many total moles of nitrogen must be used? Assume the purge is done with pure nitrogen. 3. If the purging described in problem 2 takes place using nitrogen that has 1% (mol) oxygen in it, how many vacuum purge cycles are required? How many total moles of the inert gas must be used? 4. If the purging described in problem 2 is done by way of a "sweep-through" purge instead of a vacuum purge, for how long (in minutes) must the inert gas flow through the vessel if there is a 20 psig supply of pure nitrogen available at 150 CFM (ft³/min)? How much nitrogen must be used (lbm)?
Transcribed Image Text:2. You have decided to use a vacuum purging technique to purge oxygen from a reactor vessel to reduce the concentration to 2.0% (mol). The reactor is 18 ft diameter and 40 ft tall. The temperature is 80°F. Assume that the vacuum purge goes from atmospheric pressure to 10.0 psia. How many purge cycles are required and how many total moles of nitrogen must be used? Assume the purge is done with pure nitrogen. 3. If the purging described in problem 2 takes place using nitrogen that has 1% (mol) oxygen in it, how many vacuum purge cycles are required? How many total moles of the inert gas must be used? 4. If the purging described in problem 2 is done by way of a "sweep-through" purge instead of a vacuum purge, for how long (in minutes) must the inert gas flow through the vessel if there is a 20 psig supply of pure nitrogen available at 150 CFM (ft³/min)? How much nitrogen must be used (lbm)?
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