In the production of solid potassium chromate (K2CrO4) a crystallization evaporation system is used to obtain chromate crystals (solid) from an aqueous solution with 33.3% of chromate. The 33.3% solution is fed with a flow of 4500 kg / h to the process and joins
In the production of solid potassium chromate (K2CrO4) a crystallization evaporation system is used to obtain chromate crystals (solid) from an aqueous solution with 33.3% of chromate. The 33.3% solution is fed with a flow of 4500 kg / h to the process and joins
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:In the production of solid potassium chromate (K2CrO4) a crystallization evaporation
system is used to obtain chromate crystals (solid) from an aqueous solution with 33.3%
of chromate. The 33.3% solution is fed with a flow of 4500 kg / h to the process and joins
a recirculated stream that comes from the filtration process. The recycle stream contains
36.4% chromate and the remainder is water. The resulting mixture is fed to an evaporation
equipment where the necessary water is eliminated to concentrate the solution to 49.4%
of chromate. The concentrated solution that comes out of the evaporator goes to a
crystallization process where crystals (solid) of the chromate are generated suspended
in 36.4% solution. Both the crystals and the solution that suspends them are passed to a
filter where they are separated. From the filter a "cake" is obtained that contains 100%
crystals and a "filtrate" with the 36.4% chromate solution that is recirculated to the
process.
a) Draw a flow chart for this process, clearly establishing the names of the streams, the
equipment and the known data.
b) Calculate the flow of water that is stirred in the evaporator in kg / h.
c) If the filtrate were discarded from the process instead of recirculating it, how much
would be the production of chromate crystals in kg / h in the process?
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