One of the best ways to reduce or eliminate hazardous waste is through source reduction. Generally, this means using different raw materials or redesigning the production of excess to eliminate the generation of hazardous byproduct. As an example, consider the following countercurrent extraction process to recover xylene from a stream that contains 10% xylene and 90% solids by weight. S' Clear liquid (no solids) F1 0.9 Solids 100% Benzene Product stream (no solds) 1000 kghr Waste stream 0.9 Solids Unit 1 Unit 2 - 0.9 Solds 0.1 Xylene Foed 2000 kg/hr The stream from which xylene is to be extracted enter Unit 2 at a flow rate of 2000 kg/h. To provide a solvent for the extraction, pure benzene is fed to Unit 1 at a flowrate of 1000 kg/h. The mass fractions of the xylene in the solids stream (F) and clear liquid stream (S) have the following relations: 10×F ylene = Xxylene and 10x Xxylene = Xxylene a) Determine the benzene and xylene concentrations in all of the streams. b) What is the percent recovery of the xylene entering the process at Unit 2?
One of the best ways to reduce or eliminate hazardous waste is through source reduction. Generally, this means using different raw materials or redesigning the production of excess to eliminate the generation of hazardous byproduct. As an example, consider the following countercurrent extraction process to recover xylene from a stream that contains 10% xylene and 90% solids by weight. S' Clear liquid (no solids) F1 0.9 Solids 100% Benzene Product stream (no solds) 1000 kghr Waste stream 0.9 Solids Unit 1 Unit 2 - 0.9 Solds 0.1 Xylene Foed 2000 kg/hr The stream from which xylene is to be extracted enter Unit 2 at a flow rate of 2000 kg/h. To provide a solvent for the extraction, pure benzene is fed to Unit 1 at a flowrate of 1000 kg/h. The mass fractions of the xylene in the solids stream (F) and clear liquid stream (S) have the following relations: 10×F ylene = Xxylene and 10x Xxylene = Xxylene a) Determine the benzene and xylene concentrations in all of the streams. b) What is the percent recovery of the xylene entering the process at Unit 2?
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:One of the best ways to reduce or eliminate hazardous waste is through source reduction.
Generally, this means using different raw materials or redesigning the production of excess to
eliminate the generation of hazardous byproduct. As an example, consider the following
countercurrent extraction process to recover xylene from a stream that contains 10% xylene and
90% solids by weight.
100% Benzene
1000 kg/hr
Waste stream
0.9 Solids
S' Clear liquid
(no solids)
Product stream
(no solids)
Unit 1
Unit 2
F1
FO
0.9 Solids
0.1 Xylene Foed 2000 kg/hr
0.9 Solids
The stream from which xylene is to be extracted enter Unit 2 at a flow rate of 2000 kg/h. To
provide a solvent for the extraction, pure benzene is fed to Unit 1 at a flowrate of 1000 kg/h. The
mass fractions of the xylene in the solids stream (F) and clear liquid stream (S) have the following
relations:
est,
xylene and 10xylene = Xxylene
xylene
a) Determine the benzene and xylene concentrations in all of the streams.
b) What is the percent recovery of the xylene entering the process at Unit 2?
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