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d. Four thousand kilograms per hour of a solution that is one-third K,Cr0, by mass is joined by a r ontaining 36.4% K,CrO, and the combined stream is fed into an evaporator. The concentrated ne evaporator contains 49.4% K,CrO,; this stream is fed into a crystallizer in which it is cooled (c of K2CRO, to come out of solution) and then filtered. The filter cake consists of K,CrO, crystals that contains 36.4% K¿CrO, by mass; the crystals account for 95% of the total mass of the filter cak that passes through the filter, also 36.4% K2CrO7, is the recycle stream.

d. Four thousand kilograms per hour of a solution that is one-third K,Cr0, by mass is joined by a r ontaining 36.4% K,CrO, and the combined stream is fed into an evaporator. The concentrated ne evaporator contains 49.4% K,CrO,; this stream is fed into a crystallizer in which it is cooled (c of K2CRO, to come out of solution) and then filtered. The filter cake consists of K,CrO, crystals that contains 36.4% K¿CrO, by mass; the crystals account for 95% of the total mass of the filter cak that passes through the filter, also 36.4% K2CrO7, is the recycle stream.

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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A steady-state process to recover crystalline potassium chromate (K,CrOz) from an aqueous solution of this salt is required. Four thousand kilograms per hour of a solution that is one-third K,CrO, by mass is joined by a recycle stream containing 36.4% K2CrO7, and the combined stream is fed into an evaporator. The concentrated stream leaving the evaporator contains 49.4% K,CrO; this stream is fed into a crystallizer in which it is cooled (causing crystals of K,CrO, to come out of solution) and then filtered. The filter cake consists of K,CrO, crystals and a solution that contains 36.4% K,CrO, by mass; the crystals account for 95% of the total mass of the filter cake. The solution that passes through the filter, also 36.4% K,CrO,, is the recycle stream. 1- Draw the flowchart of the system and put all known information. 2- Calculate the rate of evaporation, the rate of production of crystalline K,CrO7, the feed rates that the evaporator and the crystallizer must be designed to handle, and the recycle ratio (mass of recycle)(mass of fresh feed). 3- Suppose that the filtrate was discarded instead of being recycled. Calculate the production rate of crystals. What are the benefits and costs of the recycling?
Transcribed Image Text:A steady-state process to recover crystalline potassium chromate (K,CrOz) from an aqueous solution of this salt is required. Four thousand kilograms per hour of a solution that is one-third K,CrO, by mass is joined by a recycle stream containing 36.4% K2CrO7, and the combined stream is fed into an evaporator. The concentrated stream leaving the evaporator contains 49.4% K,CrO; this stream is fed into a crystallizer in which it is cooled (causing crystals of K,CrO, to come out of solution) and then filtered. The filter cake consists of K,CrO, crystals and a solution that contains 36.4% K,CrO, by mass; the crystals account for 95% of the total mass of the filter cake. The solution that passes through the filter, also 36.4% K,CrO,, is the recycle stream. 1- Draw the flowchart of the system and put all known information. 2- Calculate the rate of evaporation, the rate of production of crystalline K,CrO7, the feed rates that the evaporator and the crystallizer must be designed to handle, and the recycle ratio (mass of recycle)(mass of fresh feed). 3- Suppose that the filtrate was discarded instead of being recycled. Calculate the production rate of crystals. What are the benefits and costs of the recycling?
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