A liquid feed stream (Feed 1) contains 40% of pentane (P), 30% of hexane (X) and 30% of heptane (H) in mole basis. This feed stream enters Separation Unit 1 operating at steady state. In Separation Unit 1, the overhead product contains 99 wt% pentane and the rest is only hexane while the bottom product contains no pentane. A new feed stream (Feed 2) containing 40 wt% of hexane and 60 wt% of heptane is added to the bottom product stream prior feeding into Separation Unit 2 (steady state). The mass flow for Feed 2 is 1800 g/s. In the Separation Unit 2, the overhead product contains 95 wt% hexane and the bottom product contains 88 wt% heptane. (а) Given that the molar flow rate of the feed stream (Feed 1) is 100 mol/s, determine the weight percentage of Feed 1 for each component. (b) Draw a process flowchart for the above separation process. Label all the streams using the information and symbols provided. Other unknowns should be consistently labelled using suitable symbols and keep the number of labelled unknowns to a minimum.
A liquid feed stream (Feed 1) contains 40% of pentane (P), 30% of hexane (X) and 30% of heptane (H) in mole basis. This feed stream enters Separation Unit 1 operating at steady state. In Separation Unit 1, the overhead product contains 99 wt% pentane and the rest is only hexane while the bottom product contains no pentane. A new feed stream (Feed 2) containing 40 wt% of hexane and 60 wt% of heptane is added to the bottom product stream prior feeding into Separation Unit 2 (steady state). The mass flow for Feed 2 is 1800 g/s. In the Separation Unit 2, the overhead product contains 95 wt% hexane and the bottom product contains 88 wt% heptane. (а) Given that the molar flow rate of the feed stream (Feed 1) is 100 mol/s, determine the weight percentage of Feed 1 for each component. (b) Draw a process flowchart for the above separation process. Label all the streams using the information and symbols provided. Other unknowns should be consistently labelled using suitable symbols and keep the number of labelled unknowns to a minimum.
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 to solve (a) and (b)?
Transcribed Image Text:A liquid feed stream (Feed 1) contains 40% of pentane (P), 30% of hexane (X) and 30% of
heptane (H) in mole basis. This feed stream enters Separation Unit 1 operating at steady state.
In Separation Unit 1, the overhead product contains 99 wt% pentane and the rest is only
hexane while the bottom product contains no pentane. A new feed stream (Feed 2) containing
40 wt% of hexane and 60 wt% of heptane is added to the bottom product stream prior feeding
into Separation Unit 2 (steady state). The mass flow for Feed 2 is 1800 g/s. In the Separation
Unit 2, the overhead product contains 95 wt% hexane and the bottom product contains 88 wt%
heptane.
Q1.
Given that the molar flow rate of the feed stream (Feed 1) is 100 mol/s, determine the
weight percentage of Feed 1 for each component.
(a)
(b)
Draw a process flowchart for the above separation process. Label all the streams using
the information and symbols provided. Other unknowns should be consistently
labelled using suitable symbols and keep the number of labelled unknowns to a
minimum.
Conduct the degree-of-freedom analysis by listing down the variables based on the
symbols used in (b).
(c)
(d)
Determine the total mass flow rate and mass fraction for each unknown in the
flowchart.
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