Whizzo Problem
5
{t *fi/€'/ /1 CA tr tr*/ Felder and Rousseau page 169 Problem 4.37 Following a diagram of the shirt-cleaning process used by the Floods of Suds One Day Laundry Services, lnc. The shirts are soaked in an agitated tub containing Whizzo, the Wonder Detergent, and are then wrung out and sent to a rise 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. Data: L. Each 100 lbm of dirty shirts contains 2.0 lbm of dirt. 2. The washing removed 95o/o of the dirt in the difi sheets. 3. For Each 100 lbm of dirty shirts, 25 lbm of Whizzo leaves with the clean shirts, of which 22 lbm is wring back into the tub. 4. The detergent that enters the tub contains 97%oWhizzo, and that which enters the filter contains 87%.The wet dirt that leaves the filter contains 8%Whizzo. Questions a.) How much pure Whizzo must be supplied per 100lbm of dirty shirts? b.) What is the composition of the recycled stream?
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Transcript of Whizzo Problem
{t *fi/€'/ /1 CA tr tr*/
Felder and Rousseau page 169
Problem 4.37
Following a diagram of the shirt-cleaning process used by the Floods of Suds One Day Laundry Services,
lnc. The shirts are soaked in an agitated tub containing Whizzo, the Wonder Detergent, and are then
wrung out and sent to a rise 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.
Data:
L. Each 100 lbm of dirty shirts contains 2.0 lbm of dirt.
2. The washing removed 95o/o of the dirt in the difi sheets.
3. For Each 100 lbm of dirty shirts, 25 lbm of Whizzo leaves with the clean shirts, of which 22 lbm is
wring back into the tub.
4. The detergent that enters the tub contains 97%oWhizzo, and that which enters the filter
contains 87%.The wet dirt that leaves the filter contains 8%Whizzo.
Questions
a.) How much pure Whizzo must be supplied per 100lbm of dirty shirts?
b.) What is the composition of the recycled stream?
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