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Calculate (a) the rate of evaporation, or the rate of water evaporated at the evaporator, and (b) the recycle ratio [i.e. (mass flow rate of recycle)/(mass flow rate of fresh feed)]

Calculate (a) the rate of evaporation, or the rate of water evaporated at the evaporator, and (b) the recycle ratio [i.e. (mass flow rate of recycle)/(mass flow rate of fresh feed)]

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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Material Balances of Processes with Recycling, Bypassing, and Purging Example 5.2 The flow chart of a steady-state process to recover crystalline potassium chromate (K2Cro.) from the aqueous solution is shown below Water vapour Filter cake Feed 4,500 kg/h 33.3% KCro. KCro. (solid crystals) 36.4% 49.4% Evaporator KCro. Crystalliser & Filter KCro. Filtrate 36.4% K:CrO. Forty-five hundred kilograms per hour of 33.3% K,Cro, solution is joined by a recycle stream of 36.4% K,Cro, solution, and the combined stream is fed into an evaporator. The concentrated stream leaving the evaporator contains 49.4% K,CrO,. This stream is then fed into a crystallizer where it is cooled, causing crystals of K,Cro, to come out of the solution. The resulting solution and K,Cro, crystals are separated by a filter, dividing the product into 2 streams: the filter cake, which consists of K,Cro, crystals and 36.4% K;CrO, solution; and the filtrate, which is the 36.4% K,Cro, solution. The K,Cro, crystals account for 95% of the total mass of the filter cake. The filtrate is recycled to mix with the feed. Calculate (a) the rate of evaporation, or the rate of water evaporated at the evaporator, and (b) the recycle ratio [i.e. (mass flow rate of recycle)/(mass flow rate of fresh feed)]
Transcribed Image Text:Material Balances of Processes with Recycling, Bypassing, and Purging Example 5.2 The flow chart of a steady-state process to recover crystalline potassium chromate (K2Cro.) from the aqueous solution is shown below Water vapour Filter cake Feed 4,500 kg/h 33.3% KCro. KCro. (solid crystals) 36.4% 49.4% Evaporator KCro. Crystalliser & Filter KCro. Filtrate 36.4% K:CrO. Forty-five hundred kilograms per hour of 33.3% K,Cro, solution is joined by a recycle stream of 36.4% K,Cro, solution, and the combined stream is fed into an evaporator. The concentrated stream leaving the evaporator contains 49.4% K,CrO,. This stream is then fed into a crystallizer where it is cooled, causing crystals of K,Cro, to come out of the solution. The resulting solution and K,Cro, crystals are separated by a filter, dividing the product into 2 streams: the filter cake, which consists of K,Cro, crystals and 36.4% K;CrO, solution; and the filtrate, which is the 36.4% K,Cro, solution. The K,Cro, crystals account for 95% of the total mass of the filter cake. The filtrate is recycled to mix with the feed. Calculate (a) the rate of evaporation, or the rate of water evaporated at the evaporator, and (b) the recycle ratio [i.e. (mass flow rate of recycle)/(mass flow rate of fresh feed)]
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