Well, that design isn't going to work, either. I think about the only thing I can do is to try to change the concentration of the stream that is leaving Earle Hall. I need my recycle stream to contain 99% of the acetone that leaves Earle, and have a mass% of acetone of 95% (or else I can't reuse it), and I need the stream that is sent to the city's sewer to have 1 mass% acetone. What is the mass% of acetone in the stream leaving Earle that makes this possible?
Well, that design isn't going to work, either. I think about the only thing I can do is to try to change the concentration of the stream that is leaving Earle Hall. I need my recycle stream to contain 99% of the acetone that leaves Earle, and have a mass% of acetone of 95% (or else I can't reuse it), and I need the stream that is sent to the city's sewer to have 1 mass% acetone. What is the mass% of acetone in the stream leaving Earle that makes this possible?
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Please solve #3. First 2 parts have been solved
Transcribed Image Text:1. I am designing the waste water treatment center for Earle Hall. The labs use a lot of acetone for
cleaning glassware, which has to be removed from the waste water before it is sent to the city
for further processing. I want to produce one stream that is high-purity acetone, so that the
labs can re-use it. Assume that the stream leaving Earle Hall is 250,000 Ibm every day, and the
stream is 5 mass% acetone in water. I put this stream into a steady-state separator, which
creates one stream which is 95 mass% acetone (and is recycled for use), and one stream which
is 1 mass% acetone (and is sent to the city's sewer system). What will be the flowrate of the
stream to the city sewer?
2. I sent the design for the new waste water treatment center described above to the city, and
someone did a quick calculation which showed that more than 2,000 lbm per day of acetone
would be going into the city sewer. They didn't like the sound of that. So, they added the
requirement that my recycle stream contain 99% of the acetone that was fed to my separator,
and that the system maintains the 1 mass% acetone in the stream sent to the city's sewer
system. What will the flowrate to the city's sewer system be, and what will be the mass% of
acetone in the stream I recycle for use in the labs?
3. Well, that design isn't going to work, either. I think about the only thing I can do is to try to
change the concentration of the stream that is leaving Earle Hall. I need my recycle stream to
contain 99% of the acetone that leaves Earle, and have a mass% of acetone of 95% (or else I
can't reuse it), and I need the stream that is sent to the city's sewer to have 1 mass% acetone.
What is the mass% of acetone in the stream leaving Earle that makes this possible?
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