midterm3 2007 - Chemcial Engineering 140 Midterm #3 (180)...

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Chemcial Engineering 140 November 21, 2007 Midterm #3 (180) From Felder and Rousseau* In the final stage of the manufacturing process for a solid organic product, the product is cleaned with liquid toluene and then dried in a process whose flowchart is shown below. The wet product enters the dryer at a rate of 300 lb m /h containing 0.200 lb m toluene/lb m dry solids. A stream of nitrogen at 200 º F, 1.2 atm, and containing a small amount of toluene vapor also enters the dryer. (A higher temperature would cause the product to soften and degrade.) Heat is transferred in the dryer from the gas to the wet solids, causing most of the toluene to evaporate. The final product contains 0.020 lb m toluene/lb m dry solids. Gas leaves the dryer at 150 º F and 1.2 atm with a relative saturation of 70% and passes through a water-cooled condenser. Gas and liquid streams leave the condenser in equilibrium at 90 º F and 1 atm. The gas is reheated to 200 º F and reenters the dryer. Dryer
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This note was uploaded on 09/15/2009 for the course CHEM 1 taught by Professor Pines during the Spring '08 term at University of California, Berkeley.

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midterm3 2007 - Chemcial Engineering 140 Midterm #3 (180)...

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