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1、ProblemsfMassTransferSeparationProcessAbsption1Theammonia–airmixturecontaining9%ammonia(molarfraction)iscontactwiththeammoniawaterliquidcontaining5%ammonia(molarfraction).Underthisoperatingconditiontheequilibriumrelation

2、shipisy=0.97x.WhentheabovetwophasesarecontactwhatwillhappenabsptionstrippingSolution：09.0?y05.0?xxy97.0??Itisanabsptionoperation.09.00485.005.097.0??????yy2Whenthetemperatureis10theoverallpressureis101.3KPathesolubilityo

3、foxygenc0inwatercanberepresentedbyequationp=3.27?104xwherep(atm)xrefertothepartialpressureofoxygeninthevapphasethemolefractionofoxygenintheliquidphaserespectively.Assumethatwaterisfullycontactwiththeairunderthatcondition

4、calculatehowmuchoxygencanbedissolvedinthepercubicmeterofwaterSolution:themolefractionofoxygeninairis0.21hence:p=Py=1x0.21=0.21amt6441024.61027.321.01027.3????pxBecausethexisverysmallitcanbeapproximatelyequaltomolarratioX

5、thatis61042.6???xXSo??)()(4.11)(18)(1)(32)(1042.6lub2322222226OHmOgOkmolHOkgHOkmolHkmolOkgOkmolOilityso???3Anacetoneairmixturecontaining0.02molarfractionofacetoneisabsbedbywaterinapackedtowerincountercurrentflow.99％oface

6、toneisremovedmixedgasmolarflowfluxis0.03kmols—1m2practiceabsbentflowrateLis1.4timesasmuchastheminamountrequired.Undertheoperatingconditiontheequilibriumrelationshipisy=1.75x.VolumetotalabsptioncoefficientisKya=0.022kmols

7、—1m2y1..Whatisthemolarflowrateoftheabsbentwhatheightofpackingwillberequiredsolution：xa=0??0002.01????bayy733.175.102.099.002.0min????????????ababxxyyVL43.24.1min????????VLVLsmkmolL20729.003.043.2???solution：(1)35.12.103.

8、08.0003.003.0????GL(2)89.035.12.1??S26.689.0003.003.011.089.011??????????InNOY(3)mNZHOYOY958.026.66???47.889.0002.003.011.089.011????????????InNOYSinceitisnotsuitablemNHZOYOY0.61.847.8958.0??????6Purewaterisusedinanabspt

9、iontowerwiththeheightofthepackedlayer3mtoabsbammoniainanairstream.Theabsptivityis99percent.Theoperatingconditionsofabsberare101.3kpa20crespectively.ThefluxofgasVis580kg(m.h)6percent(volume%)of02ammoniaiscontainedinthegas

10、mixture.ThefluxofwaterLis770kg(m.h).Thegas2liquidiscountercurrentinthetoweratisothermaltemperature.Theequilibriumequationy=0.9xgasphasemasstransfercoefficientkaisproptionaltoV0.8butithasnothingtodowithL.GWhatistheheighto

11、fthepackedlayerneededtokeepthesameabsptivitywhentheconditionsofoperationchangeasfollows:(1)theoperatingpressureis2timesasmuchastheiginal.(2)themassflowrateofwaterisonetimemethantheiginal.3)themassflowrateofgasistwotimesa

12、smuchastheiginalSolution:31293ZmpatmTK???1210.060.063810.06(10.99)0.000638YYY??????TheaveragemolecularweightofthemixedgasM=290.94170.06=28.2822580(10.06)19.28()28.2877042.78()180.919.280.405642.78VkmolmhLkmolmhmVL???????

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