Felder, Roussea Bullard, Elementary Principles of chemical Processes, 4e Roussea

Question

Felder, Roussea Bullard, Elementary Principles of chemical Processes, 4e Rousseau, u, Announcements CALCULATOR PRINTER VERSION BACK NEXT Problem 4.50 Whizzo Following is a diagram of the shirt-cleaning process used by the Floods of Suds One-Day Laundry Services, Inc. he shirts are soaked in an agitated tub containing whizzo, the wonder Detergent, and are then wrung out and sent to a rinse stage. The dirty whizzo is sent to a filter in which most of the dirt is removed, and the cleaned detergent is recycled back to join a stream of pure whizzo, with the combined stream serving as the feed to the washtub. Dirty Shirts Clean Shirts AGITATED 97.0% Whizz Waste FILTER Recycled Whizzo 1. Each 100.0 Ibm of dirty shirts contains 3.00 lbm of dirt. 2. The washing removes 90.0% of the dirt in the dirty shirts. 3. For each 100.0 lbm of dirty shirts, 28.0 lbrm of Whizzo leaves with the clean shirts, of which 22.0 lbm is wrung back into the tub. 4. The detergent that enters the tub contains 97.0% Whizzo, and that which enters the filter contains 79.0%. The wet dirt that leaves the filter contains 8.00% Whizzo.

Explanation / Answer

Given 100 lbm shirt contains 2 lbm of dirt.

SO undirt is=98lbm

As given washing removes 90% of the dirt.

Washed dirt=2*90/100=1.8lbm

Unremoved dirt=2.0-1.9=0.1ibm

It is also given that for 100lbm of shirt 28ibm whizzo detergent powder leaves with clean shirt

Whizzo adheared with 100ibm shirt=28-22=5 ibm

Mass of wet shirt=100+5=105ibm

Mass of wet shirt=100/97/100=103.1ibm

whizzo powder 103.1 lbm inlet of the filter

87% of this is 105.1*87/100= 90.2 lbm outlet of the filter

Now 8 % of 105=8*105/100=8.5lbm the

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