How would you expect the vapor flow rate to vary with time? A.)It should decrease from zero to a negative value and then remain constant. B.)It should abruptly change from zero to two thirds the molar feed flow rate at some time. C.)It should gradually increase from zero to two thirds of the molar feed flow rate and then remain constant. D.)It should start at zero but approach 100% of the molar feed flow rate over time. E.)It should increase from zero and then oscillate about a mean value about 25% of the molar feed flow rate.
How would you expect the vapor flow rate to vary with time? A.)It should decrease from zero to a negative value and then remain constant. B.)It should abruptly change from zero to two thirds the molar feed flow rate at some time. C.)It should gradually increase from zero to two thirds of the molar feed flow rate and then remain constant. D.)It should start at zero but approach 100% of the molar feed flow rate over time. E.)It should increase from zero and then oscillate about a mean value about 25% of the molar feed flow rate.
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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How would you expect the vapor flow rate to vary with time?
A.)It should decrease from zero to a negative value and then remain constant.
B.)It should abruptly change from zero to two thirds the molar feed flow rate at some time.
C.)It should gradually increase from zero to two thirds of the molar feed flow rate and then remain constant.
D.)It should start at zero but approach 100% of the molar feed flow rate over time.
E.)It should increase from zero and then oscillate about a mean value about 25% of the molar feed flow rate.
Transcribed Image Text:A stream consisting of 31.7 mole% benzene (B)
and 68.3% toluene (T) is fed at a constant rate to a
process unit that produces two product streams,
one a vapor and the other a liquid.
The vapor flow rate is initially zero and
asymptotically approaches two thirds of the molar
flow rate of the feed stream. Throughout this
entire period, no material accumulates in the unit.
When the vapor flow rate has become constant,
the liquid is analyzed and found to be 25.7 mole%
benzene.
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