Chptr1PrblmSolns

Chptr1PrblmSolns - 1.1-1.7The solutions for these problems...

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Unformatted text preview: 1.1-1.7The solutions for these problems are the solutions for problems 1.1-1.7 in the 2ndedition Solutions Manual. 1.8The washing machine is a batch reactor in which a first order decay of grease on the clothes is occurring. The integrated form of the mass balance equation is: ktCC-e=First, find k: 1-min0.1280.881ln min110.88ln min11ln1====CCCCtkNext, calculate the grease remaining on the clothes after 5 minutes: ( )()()g0.264eg0.500e1-1min.005min128.--===ktmmThe grease that is not on the clothes must be in the water, so g/L0.00472L50.0g0.264-g0.500w==CQ, CQs, CsQb, CfarmPlateau CreekC.V. Qf/2, Cf1.9 Qf, Ca.A mass balance around control volume (C.V.) at the downstream junction yields ( )( )( ) ( )( )( )mg/L0.112/sm4.5mg/L0015./sm4.0mg/L00.1/sm0.5/2333sbffs=+=+=QCQCQCb. Noting that Qb= Q– Qfand Qs= Q– Qf/2 the mass balance becomes (Qf/2)Cf+ (Q– Qf)C= (Q–Qf/2)Csand solving for the maximum Qfyields ( )( )( )/sm0.371mg/L20.040.0015-21.0mg/L0.0015-04./sm5.02-2-33sfsf=⎟⎠⎞⎜⎝⎛+=⎟⎠⎞⎜⎝⎛+=CCCCCQQ1.10Write a mass balance on a second order reaction in a batch reactor: Accumulation = Reaction 2-erewhkmr(m)Vr(m)dtdmV==∫∫=t...
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This note was uploaded on 04/03/2008 for the course C E 370 taught by Professor Burgos during the Spring '08 term at Penn State.

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Chptr1PrblmSolns - 1.1-1.7The solutions for these problems...

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