Homework 5 - ChE 150B Problem Set 5 Due September 30, 2009...

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ChE 150B Problem Set 5 Due September 30, 2009 Problem 1. To raise the oxygen concentration in wastewater, air is injected through spargers located near the bottom of a water-holding tank. Oxygen is transferred from the released air bubbles into the surrounding aqueous phase. Determine the overall liquid mass-transfer coefficient, K L , and the percent resistance encountered in the liquid phase if the individual mass-transfer coefficients of oxygen transferring from air into 293 K water are k L = 2.15x10 -5 kg mole/m 2 ∙s∙(kg mole/m 3 ) and k G = 9.28x10 -8 kg mole/m 2 ∙s∙Pa. The Henry’s law modified coefficient for oxygen in water is reported to be 4.06x10 9 Pa/ (moles of oxygen per total moles of solution). Problem 2. Jasmone, C 11 H 16 O, a valuable intermediate in the fine chemical industry, is obtained from the jasmine plant. A common method of manufacture is to extract the plant material in water, and then use benzene to concentrate the jasmine in a simple liquid-liquid extraction process. Jasmone (species A) is 170 times more soluble in
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This note was uploaded on 01/13/2010 for the course CHEM 1 taught by Professor Pines during the Winter '08 term at University of California, Berkeley.

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Homework 5 - ChE 150B Problem Set 5 Due September 30, 2009...

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