CHE 501 Assignment 5 - ChE 501 Fall 2016 HW Assignment 5...

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Unformatted text preview: ChE 501 Fall 2016 HW Assignment 5 Solution 1. Classify the following processes as either continuous, batch or semi-batch An open tank full of water is heated until the water boils. The water continues to boil until the water level has fallen three feet. The heat is then shut off. --Semi—B atch. The vapor leaves continuously Raw petroleum enters the middle of a distillation column at a constant rate. A light stream leaves the top of the column and a heavy stream leaves the bottom, both at a constant rate and constant composition. —-Continuous A bio-reactor is charged with a nutrient solution and a bacteria culture. After four hours, the reactor is opened and the solution is removed. --B atch A mixture of nitrogen and hydrogen is fed to a catalytic reactor at a constant rate. A product stream containing nitrogen, hydrogen 'and ammonia leaves the'react‘or‘at 'a ' " " constant rate. --Continuous 2. Draw and label a flow diagram for the following process. Determine if it is a continuous or batch process, perform a degree of freedom analysis, and write a complete set of independent material balances. If possible, solve for the unknowns. A solution of 32.7 wt% NaCl in water enters a crystallizer at a rate of 855 kg/h. Two streams leave the reactor; a stream of pure NaCl with a flow-rate of 12.4 kg/h and a stream of NaCl in water with a mass fraction x; of NaCl. x2 kg NaCl/kg 2 855 kg/h 0.327 kg NaCl/kg 3 12.4 kg NaCl/h --Continuous process. Two Components => 2 balance equations Two variables m2 and xz. => 2 unknowns ...
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