le 4.5:An oil containing 2.55 mole per cent of a hydrocarbon is stripped by running the oil downa column up which live steam is passed, so that 4 kmole of steam are used /100 kmol of oilstripped. Determine the number of theoretical plates required to reduce the hydrocarbon contentto 0.05 mole per cent, assuming that the oil is non-volatile. The vapour-liquid relation of thehydrocarbon in the oil is given by ye = 33x, where ye is the mole fraction in the vapour and x themole fraction in the liquid. The temperature is maintained constant by internal heating, so thatsteam does not condense in the tower.

L = oil moles = 100 kmol G = steam moles = 4 kmol x1 = 0.0255 , x2 = .0005 y = 33x yo=0

Answered: e 4.5:An oil containing 2.55 mole per…

Introduction to Chemical Engineering Thermodynamics

8th Edition

ISBN:9781259696527

Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Chapter1: Introduction

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In a counter-current absorption tower, a process gas containing 0.04 (mole fraction) ammonia is scrubbed with pure water. The exit gas contains 0.002 (mole fraction) ammonia.The diameter of the tower is 1m, and the packing has a large area per volume of 200 m2m–3. The overall mass transfer coefficient based on the liquid side driving force, KL, is 1.5×10−5ms–1. The total gas and liquid concentrations are 0.6kmolm–3and 20 kmolm–3respectively and the gas flowrateis 0.03kmols–1. The actual liquid to gas ratio is 1.5 times that of the minimum liquid to gas ratio. The equilibrium for ammonia between the air and water is given by y* = 1.04x. Draw a rough sketch of the operating and equilibrium lines and label the slopes. How many transfer units are needed? What is the height of the tower?
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In a counter-current absorption tower, a process gas containing 0.04 (mole fraction) ammonia is scrubbed with pure water. The exit gas contains 0.002 (mole fraction) ammonia.The diameter of the tower is 1m, and the packing has a large area per volume of 200 m2m–3. The overall mass transfer coefficient based on the liquid side driving force, KL, is 1.5×10−5ms–1. The total gas and liquid concentrations are 0.6kmolm–3and 20 kmolm–3respectively and the gas flowrateis 0.03kmols–1. The actual liquid to gas ratio is 1.5 times that of the minimum liquid to gas ratio. The equilibrium for ammonia between the air and water is given by y* = 1.04x. If the operator increases the gas flow by 20% while keeping the liquid flow and the entering gas and liquid compositions constant,what are the new mole fractions of ammonia in the exit gas and the exit liquid? Assume that the overall mass transfer coefficient does not change with the gas flow.

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