112811-hw7-f011

112811-hw7-f011 - Department of Chemical Engineering University of California Santa Barbara CHE 140B Fall 2011 Problem Set No 7 Due Tuesday Problem

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Department of Chemical Engineering Fall, 2011 University of California, Santa Barbara 1 CHE 140B Problem Set No. 7 Due Tuesday, November 22, 2011 Problem 1: Schmidt, 7.18 A certain spherical porous catalyst with a pellet diameter of 1/8 in. has a Thiele modulus of 0.5 for a first-order reaction and gives 90% conversion in a packed bed reactor under a given set of conditions. It is proposed to replace this catalyst by the exact same catalyst, but with pellets of 1/4 or 1/2 in. to reduce the pressure drop. How will the conversion change with these catalysts? (Be quantitative.) Problem 2: Schmidt, 7.19 A first-order catalytic reaction has an activation energy of 20 kcal/mole for a given catalyst pellet size and gives a 90% conversion in a slurry reactor at 50 °C. (a) What will be the conversion if the temperature is increased by 10 K if the Thiele modulus is small? (b) What will be the conversion if the temperature is increased by 10 K if the Thiele modulus is large?
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This note was uploaded on 12/29/2011 for the course CHE 140b taught by Professor Ceweb during the Fall '10 term at UCSB.

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112811-hw7-f011 - Department of Chemical Engineering University of California Santa Barbara CHE 140B Fall 2011 Problem Set No 7 Due Tuesday Problem

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