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In the production of painkiller tablets, 4500 kg/h of a solution that is 33.3% drug by mass is joined by a recycle stream containing 36.4% drug, and the combined stream is fed into an evaporator (see Figure 2). The concentrated stream leaving the evaporator contains 49.4% drug, and is in turn fed into a crystallizer in which it is cooled. The cooling causes crystals of the drug to precipitate. The crystals are then filtered out of the solution. The "filter cake" consists of drug crystals and a solution that contains 36.4% drug by mass, such that the crystals account for 95% of the total mass of the filter cake. The "filtrate" solution that passes through the filter also contains 36.4% drug, and is recycled.

In the production of painkiller tablets, 4500 kg/h of a solution that is 33.3% drug by mass is joined by a recycle stream containing 36.4% drug, and the combined stream is fed into an evaporator (see Figure 2). The concentrated stream leaving the evaporator contains 49.4% drug, and is in turn fed into a crystallizer in which it is cooled. The cooling causes crystals of the drug to precipitate. The crystals are then filtered out of the solution. The "filter cake" consists of drug crystals and a solution that contains 36.4% drug by mass, such that the crystals account for 95% of the total mass of the filter cake. The "filtrate" solution that passes through the filter also contains 36.4% drug, and is recycled.

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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a) What is the mass rate of production of the crystals?
b) What is the mass rate of evaporation
c ) Calculate the mass flow rate entering the evaporator, the mass flow rate entering the crystallizer, and the mass flow of the recycle.
In the production of painkiller tablets, 4500 kg/h of a solution that is 33.3% drug by mass is joined by a recycle stream containing 36.4% drug, and the combined stream is fed into an evaporator (see Figure 2). The concentrated stream leaving the evaporator contains 49.4% drug, and is in turn fed into a crystallizer in which it is cooled. The cooling causes crystals of the drug to precipitate. The crystals are then filtered out of the solution. The "filter cake" consists of drug crystals and a solution that contains 36.4% drug by mass, such that the crystals account for 95% of the total mass of the filter cake. The "filtrate" solution that passes through the filter also contains 36.4% drug, and is recycled.
Transcribed Image Text:In the production of painkiller tablets, 4500 kg/h of a solution that is 33.3% drug by mass is joined by a recycle stream containing 36.4% drug, and the combined stream is fed into an evaporator (see Figure 2). The concentrated stream leaving the evaporator contains 49.4% drug, and is in turn fed into a crystallizer in which it is cooled. The cooling causes crystals of the drug to precipitate. The crystals are then filtered out of the solution. The "filter cake" consists of drug crystals and a solution that contains 36.4% drug by mass, such that the crystals account for 95% of the total mass of the filter cake. The "filtrate" solution that passes through the filter also contains 36.4% drug, and is recycled.
H20 Feed 49.4% drug crystallizer mixer evaporator and 33.3% drug filter Filter cake = crystals (pure drug) + solution (36.4% drug) Recycle 36.4% drug Figure 2. An evaporative crystallization process.
Transcribed Image Text:H20 Feed 49.4% drug crystallizer mixer evaporator and 33.3% drug filter Filter cake = crystals (pure drug) + solution (36.4% drug) Recycle 36.4% drug Figure 2. An evaporative crystallization process.
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