A stripper is unable to obtain the specified purity of the outlet liquid. The ou

Question

A stripper is unable to obtain the specified purity of the outlet liquid. The outlet liquid concentration of the impurity can be decreased (which might allow one to reach or exceed the specified purity) by doing which of the following changes? Circle all correct answers. There are five correct answers—one in each pair (A,B,C,D,E). Note: Think of this as doing each change by itself and determine if it decreases the concentration of impurity in the outlet liquid

Increase inlet gas flow rate. b. A. a. Decrease inlet gas flow rate. B. c. Increase inlet liquid flow rate d. Decrease inlet liquid flow rate. C. e. D. g. E. i. Increase number of stages. f. Decrease number of stages. Increase column pressure. h. Decrease column pressure. Increase temperature of inlet gas and inlet liquid. Decrease temperature of inlet gas and inlet liquid. j.

Explanation / Answer

Stripping factor

S = mG/L

m = slope of equilibrium line

G= Gas flow rate

L = liquid flow rate

Greater the stripping factor, higher the purity of outlet liquid

Part a

Increase in the G, will increase the purity of outlet liquid

Part b

Decrease in the G, will increase the purity of outlet liquid

Part C

Increasing the stages, will increase the purity of outlet liquid

Part d

Decrease the pressure, will increase the purity of outlet liquid

Part e

Increase the temperature, will increase the purity of outlet liquid

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