Guideline_homework5

Guideline_homework5 - composition is 4% water and 96% KNO3...

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Guideline of Homework 5 Problem 1 12.6, p. 381. Cereal is being dried in a vertical drier by air flowing countercurrent to the cereal. To prevent breakage of the cereal flakes, exit air from the drier is recycled. For each 1000 kg/hr of wet cereal fed to the drier, calculate the input of moist fresh air in kg/hr and the recycle rate in kg/hr. Data on the stream compositions (Note that air compositions are given as mole fractions and cereal compositions are given as weight fractions.): Fresh air Wet cereal Exit air Dried cereal Air entering drier H 2 O 0.0132 0.200 0.263 0.050 0.066 200 . 0 2 O H 050 . 0 2 O H 263 . 0 2 O H y 066 . 0 2 O H y 263 . 0 2 O H y 263 . 0 2 O H y 0132 . 0 2 O H y Basis: 1000 kg/h wet cereal Find: 6 m 5 m Balance on dry cereal over drier (mass) ………. Calculate molecular weights air air O H O H avg MW y MW y MW 2 2 ……… Balances on drier (moles) We have 2 equations and 2 unknowns ( 7 m , 3 m ) Balances on mixer We have 2 equations and 2 unknowns ( 5 m , 6 m )
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Problem 2 12.7, p.382. Examine Figure P12.7. What is the quantity of the recycle stream in kg/hr? In stream C the
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Unformatted text preview: composition is 4% water and 96% KNO3 Basis: 10 4 kg/h is the fraction of KNO 3 in that stream % given is the % by weight First, do overall balances to get total mass of C and W. Then, do balances on equipments to get total mass of R and M. Problem 3 12.8, p.382. Sea water is to be desalinized by reverse osmosis using the scheme indicated in Figure P12.8. Use the data given in the figure to determine: a) The rate of waste brine removal (B) b) The rate of desalinized water (called potable water) production (D) c) The fraction of the brine leaving the reserve osmosis cell (which acts in essence as a separator) that is recycled. % given is the % by weight Do overall balances to get mass flow rate of D and B. Then balances on equipments. Part c) asks for ratio of R/C....
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This note was uploaded on 09/07/2009 for the course CHEN 2800 taught by Professor Process during the Summer '08 term at University of Utah.

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Guideline_homework5 - composition is 4% water and 96% KNO3...

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