4500 kg/h of a solution that is 1/3 K2CrO4 by mass is joined by a recycle stream containing 36.4 % K2CrO4, and the combined stream is fed into an evaporator. The concentrated stream leaving the evaporator contains 49.4% K2CrO4, and is in turn fed into a crystallizer in which it is cooled. The cooling causes crystals of K2CrO4 to precipitate. The crystals are then filtered out of the solution. The "filter cake" consists of K2Cr04 crystals and a solution that contains 36.4 % K2CrO4 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 % K2CrO4, and is recycled. Determine the following: a. Mass rate of evaporation b. Mass rate of production of K2CrO4 crystals c. Mass feed rates that the evaporator and the crystallizer must handle d. Recycle ratio. The recycle ratio = (mass of recycle)/(mass of fresh feed). filter cake 4500 ko'h evaporator 49.4% K,CrO, crystallizer K2cro, (solid crystals) 3.3% K2CrO4 and fiter 36.4% K,Cro, solution tcrystals consttute 95 % by mass of the fiter cake) fitrate: 36.4% K2Cro4 solution
4500 kg/h of a solution that is 1/3 K2CrO4 by mass is joined by a recycle stream containing 36.4 % K2CrO4, and the combined stream is fed into an evaporator. The concentrated stream leaving the evaporator contains 49.4% K2CrO4, and is in turn fed into a crystallizer in which it is cooled. The cooling causes crystals of K2CrO4 to precipitate. The crystals are then filtered out of the solution. The "filter cake" consists of K2Cr04 crystals and a solution that contains 36.4 % K2CrO4 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 % K2CrO4, and is recycled. Determine the following: a. Mass rate of evaporation b. Mass rate of production of K2CrO4 crystals c. Mass feed rates that the evaporator and the crystallizer must handle d. Recycle ratio. The recycle ratio = (mass of recycle)/(mass of fresh feed). filter cake 4500 ko'h evaporator 49.4% K,CrO, crystallizer K2cro, (solid crystals) 3.3% K2CrO4 and fiter 36.4% K,Cro, solution tcrystals consttute 95 % by mass of the fiter cake) fitrate: 36.4% K2Cro4 solution
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:3. 4500 kg/h of a solution that is 1/3 K2CrO4 by mass is joined by a recycle stream containing 36.4 %
K2CrO4, and the combined stream is fed into an evaporator. The concentrated stream leaving the
evaporator contains 49.4% K2CrO4, and is in turn fed into a crystallizer in which it is cooled. The
coling causes crystals of K2CrO4 to precipitate. The crystals are then filtered out of the solution.
The "filter cake" consists of K2CrO4 crystals and a solution that contains 36.4 % K2Cr04 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 % K2C•O4, and is recycled. Determine the
following:
a. Mass rate of evaporation
b. Mass rate of production of K2CrO4 crystals
c. Mass feed rates that the evaporator and the crystallizer must handle
d. Recycle ratio. The recycle ratio = (mass of recycle)/(mass of fresh feed).
H20
evaporator 49.4% KgCrO,
filter cake
crystallizer K2Cro, (solid crystals)
4500 koh
33.3% K2C1O4
and
fiter
36.4% K,Cro, solution
(crystals consttute 95 %
| by mass of the filter cake)
fitrate: 36.4% K,Cro, solution
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