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
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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Catalysis and Enzymatic Reactions
Catalysis is the kind of chemical reaction in which the rate (speed) of a reaction is enhanced by the catalyst which is not consumed during the process of reaction and afterward it is removed when the catalyst is not used to make up the impurity in the product. The enzymatic reaction is the reaction that is catalyzed via enzymes.
Lock And Key Model
The lock-and-key model is used to describe the catalytic enzyme activity, based on the interaction between enzyme and substrate. This model considers the lock as an enzyme and the key as a substrate to explain this model. The concept of how a unique distinct key only can have the access to open a particular lock resembles how the specific substrate can only fit into the particular active site of the enzyme. This is significant in understanding the intermolecular interaction between proteins and plays a vital role in drug interaction.
Question
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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