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The company you are working in, is attempting to use a new patented chemical (density 0.975 kg/L), to strengthen wood fibres since wood is known to be easily degrades without sufficient preservation. The chemical is costly to produce, and the company hopes to reuse as much of it as possible. 4.5 L/min of chemical and 100 kg/hr of wood fibre are fed into a steady state mixer. The chemical stream is a combination of recycled and make-up (fresh chemical) streams. The mixture is then fed into a filter where the top product has a mass flow of 3.5 times that of wood fibre fed to the mixer, where the filter's bottom product has equal parts mass of wood and chemical.

The company you are working in, is attempting to use a new patented chemical (density 0.975 kg/L), to strengthen wood fibres since wood is known to be easily degrades without sufficient preservation. The chemical is costly to produce, and the company hopes to reuse as much of it as possible. 4.5 L/min of chemical and 100 kg/hr of wood fibre are fed into a steady state mixer. The chemical stream is a combination of recycled and make-up (fresh chemical) streams. The mixture is then fed into a filter where the top product has a mass flow of 3.5 times that of wood fibre fed to the mixer, where the filter's bottom product has equal parts mass of wood and chemical.

Introduction to Chemical Engineering Thermodynamics
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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The company you are working in, is attempting to use a new patented chemical (density 0.975 kg/L), to strengthen wood fibres since wood is known to be easily degrades without sufficient preservation. The chemical is costly to produce, and the company hopes to reuse as much of it as possible. 4.5 L/min of chemical and 100 kg/hr of wood fibre are fed into a steady state mixer. The chemical stream is a combination of recycled and make-up (fresh chemical) streams. The mixture is then fed into a filter where the top product has a mass flow of 3.5 times that of wood fibre fed to the mixer, where the filter's bottom product has equal parts mass of wood and chemical. The filter's top product is fed into an evaporator which produces a pure chemical vapour stream. The chemical vapour is then condensed into liquid and recycled into the mixer. Any non-vaporized mass leaves the bottom of the evaporator with a mass fraction of 0.50 chemical and combines with the bottom product of the filter. (a) Illustrate a completely labelled flow chart of the process described above. (b) Define the basis of calculation and required assumption(s). Perform degree of freedom analysis on the overall process and each of the process units. (c) Determine the compositions of unknown compositions for each stream and the ratio of make-up chemical to recycled chemical. Based on the ratio obtained, explain two (2) ways to reduce the use of make-up chemical in the process.
Transcribed Image Text:The company you are working in, is attempting to use a new patented chemical (density 0.975 kg/L), to strengthen wood fibres since wood is known to be easily degrades without sufficient preservation. The chemical is costly to produce, and the company hopes to reuse as much of it as possible. 4.5 L/min of chemical and 100 kg/hr of wood fibre are fed into a steady state mixer. The chemical stream is a combination of recycled and make-up (fresh chemical) streams. The mixture is then fed into a filter where the top product has a mass flow of 3.5 times that of wood fibre fed to the mixer, where the filter's bottom product has equal parts mass of wood and chemical. The filter's top product is fed into an evaporator which produces a pure chemical vapour stream. The chemical vapour is then condensed into liquid and recycled into the mixer. Any non-vaporized mass leaves the bottom of the evaporator with a mass fraction of 0.50 chemical and combines with the bottom product of the filter. (a) Illustrate a completely labelled flow chart of the process described above. (b) Define the basis of calculation and required assumption(s). Perform degree of freedom analysis on the overall process and each of the process units. (c) Determine the compositions of unknown compositions for each stream and the ratio of make-up chemical to recycled chemical. Based on the ratio obtained, explain two (2) ways to reduce the use of make-up chemical in the process.
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