3. Hexane is used as a solvent to remove dirt and grease. At the end of a cleaning process, it is desirable to filter and recover a portion of the used hexane to reduce the environmental impact. The process can be represented by the following schematic: Clean hexane Dirty solvent Waste slurry Waste Filtered hexane The input to a steady-state hexane recovery process is the dirty solvent, which is fed at 200 g/hr and contains 85 wt% n-hexane (H), 5 wt% liquid contaminants (C), and the remainder solids (S). In the first unit, filtration produces two streams: a thick waste slurry that contains 72 wt% solids (all the solids that entered) and filtered hexane that still contains some residual liquid contaminants. The waste slurry then enters a second unit to evaporate and recover all the remaining hexane as a pure stream. A separate waste stream also exits. The ratio of hexane to liquid contaminants in the dirty solvent and filtered hexane are the same. a) Draw a complete flowchart for the process and clearly state any assumptions. b) OClearly indicate the boundaries for the overall process with a dashed line, then complete a DOF analysis for the overall process. c) How much clean hexane is recovered in g/hr? d) to a liquid. If the hexane has a vapor pressure of 0.78 atm, at what temperature will the first drop of liquid form? In a separate process, the evaporated hexane is isobarically cooled and condensed
3. Hexane is used as a solvent to remove dirt and grease. At the end of a cleaning process, it is desirable to filter and recover a portion of the used hexane to reduce the environmental impact. The process can be represented by the following schematic: Clean hexane Dirty solvent Waste slurry Waste Filtered hexane The input to a steady-state hexane recovery process is the dirty solvent, which is fed at 200 g/hr and contains 85 wt% n-hexane (H), 5 wt% liquid contaminants (C), and the remainder solids (S). In the first unit, filtration produces two streams: a thick waste slurry that contains 72 wt% solids (all the solids that entered) and filtered hexane that still contains some residual liquid contaminants. The waste slurry then enters a second unit to evaporate and recover all the remaining hexane as a pure stream. A separate waste stream also exits. The ratio of hexane to liquid contaminants in the dirty solvent and filtered hexane are the same. a) Draw a complete flowchart for the process and clearly state any assumptions. b) OClearly indicate the boundaries for the overall process with a dashed line, then complete a DOF analysis for the overall process. c) How much clean hexane is recovered in g/hr? d) to a liquid. If the hexane has a vapor pressure of 0.78 atm, at what temperature will the first drop of liquid form? In a separate process, the evaporated hexane is isobarically cooled and condensed
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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![3.
Hexane is used as a solvent to remove dirt and grease. At the end of a cleaning
process, it is desirable to filter and recover a portion of the used hexane to reduce the
environmental impact. The process can be represented by the following schematic:
Clean hexane
Dirty solvent
Waste slurry
Waste
Filtered
hexane
The input to a steady-state hexane recovery process is the dirty solvent, which is fed at
200 g/hr and contains 85 wt% n-hexane (H), 5 wt% liquid contaminants (C), and the
remainder solids (S). In the first unit, filtration produces two streams: a thick waste slurry
that contains 72 wt% solids (all the solids that entered) and filtered hexane that still
contains some residual liquid contaminants.
The waste slurry then enters a second unit to evaporate and recover all the remaining
hexane as a pure stream. A separate waste stream also exits.
The ratio of hexane to liquid contaminants in the dirty solvent and filtered hexane are the
same.
а)
Draw a complete flowchart for the process and clearly state any assumptions.
b)
complete a DOF analysis for the overall process.
Clearly indicate the boundaries for the overall process with a dashed line, then
c)
How much clean hexane is recovered in g/hr?
] In a separate process, the evaporated hexane is isobarically cooled and condensed
to a liquid. If the hexane has a vapor pressure of 0.78 atm, at what temperature will the
first drop of liquid form?
d)](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F0064c266-9612-4ecd-a58d-2da2c22e8491%2Feca2b484-5a8e-4779-aa8a-c7da95695be3%2Fbeykdq_processed.jpeg&w=3840&q=75)
Transcribed Image Text:3.
Hexane is used as a solvent to remove dirt and grease. At the end of a cleaning
process, it is desirable to filter and recover a portion of the used hexane to reduce the
environmental impact. The process can be represented by the following schematic:
Clean hexane
Dirty solvent
Waste slurry
Waste
Filtered
hexane
The input to a steady-state hexane recovery process is the dirty solvent, which is fed at
200 g/hr and contains 85 wt% n-hexane (H), 5 wt% liquid contaminants (C), and the
remainder solids (S). In the first unit, filtration produces two streams: a thick waste slurry
that contains 72 wt% solids (all the solids that entered) and filtered hexane that still
contains some residual liquid contaminants.
The waste slurry then enters a second unit to evaporate and recover all the remaining
hexane as a pure stream. A separate waste stream also exits.
The ratio of hexane to liquid contaminants in the dirty solvent and filtered hexane are the
same.
а)
Draw a complete flowchart for the process and clearly state any assumptions.
b)
complete a DOF analysis for the overall process.
Clearly indicate the boundaries for the overall process with a dashed line, then
c)
How much clean hexane is recovered in g/hr?
] In a separate process, the evaporated hexane is isobarically cooled and condensed
to a liquid. If the hexane has a vapor pressure of 0.78 atm, at what temperature will the
first drop of liquid form?
d)
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