3. A feed stream containing CO₂ and H₂S is fed to a mixer, where it is mixed with a fresh feed stream containing 100% solvent (S), and a recycle stream. The mixer effluent is fed to a flash unit, for the purpose of separating the CO₂ from the H₂S. The liquid stream leaving the bottom of the flash is fed to a valve, where it is split equally into two streams, so that of the stream is recycled back to the mixer, and the other 1/2 is removed from the system. • The vapor stream leaving the top of the flash contains 67% CO2, and remainder H₂S and S. This stream contains 25% of the CO₂ from the fresh feed and 15% of the H₂S from the fresh feed. • The liquid stream leaving the bottom of the flash contains 5% CO2, and remainder H₂S and S. There is no chemical reaction. Process is continuous and at steady state. a) Completely label each stream on the process flowchart, assigning variable names. Use the conventions described in class (n, for molar flow rates, y₁ for mole fractions). b) Do a degree of freedom analysis each of the 4 systems: Label each equation with the SYSTEM AND SPECIES being balanced; or name of type of information (if not a material balance).
3. A feed stream containing CO₂ and H₂S is fed to a mixer, where it is mixed with a fresh feed stream containing 100% solvent (S), and a recycle stream. The mixer effluent is fed to a flash unit, for the purpose of separating the CO₂ from the H₂S. The liquid stream leaving the bottom of the flash is fed to a valve, where it is split equally into two streams, so that of the stream is recycled back to the mixer, and the other 1/2 is removed from the system. • The vapor stream leaving the top of the flash contains 67% CO2, and remainder H₂S and S. This stream contains 25% of the CO₂ from the fresh feed and 15% of the H₂S from the fresh feed. • The liquid stream leaving the bottom of the flash contains 5% CO2, and remainder H₂S and S. There is no chemical reaction. Process is continuous and at steady state. a) Completely label each stream on the process flowchart, assigning variable names. Use the conventions described in class (n, for molar flow rates, y₁ for mole fractions). b) Do a degree of freedom analysis each of the 4 systems: Label each equation with the SYSTEM AND SPECIES being balanced; or name of type of information (if not a material balance).
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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Transcribed Image Text:Fresh feed, Stream 1
30 mole/s CO₂
10 mole/s H₂S
mixer
100% S
Stream 2
Stream 3
flash
Stream 4
Transcribed Image Text:3. A feed stream containing CO₂ and H₂S is fed to a mixer, where it is mixed with a fresh feed stream
containing 100% solvent (S), and a recycle stream. The mixer effluent is fed to a flash unit, for the
purpose of separating the CO₂ from the H₂S. The liquid stream leaving the bottom of the flash is fed to
a valve, where it is split equally into two streams, so that of the stream is recycled back to the mixer,
and the other 1/2 is removed from the system.
•
The vapor stream leaving the top of the flash contains 67% CO2, and remainder H₂S and S. This stream
contains 25% of the CO₂ from the fresh feed and 15% of the H₂S from the fresh feed.
• The liquid stream leaving the bottom of the flash contains 5% CO₂, and remainder H₂S and S.
There is no chemical reaction. Process is continuous and at steady state.
a) Completely label each stream on the process flowchart, assigning variable names. Use the conventions
described in class (n; for molar flow rates, y; for mole fractions).
b) Do a degree of freedom analysis each of the 4 systems:
Label each equation with the SYSTEM AND SPECIES being balanced; or name of type of information
(if not a material balance).
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