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1、ProblemforMassTransferandSeparationProcessesAbsorption1At20℃,theammoniasolubilityinwaterisl0kgNH3／1000kgH2O,gasphaseequilibriummolarfractiony*is0.008,trytocalculatefollowingcoefficients,HenrycoefficientE,equilibriumconstantmwhenthefollowingconditionsare(1)Totalpressureab
2、ovetheammoniais101.3kPa(absoluteatmosphere);(2)Totalpressureabovetheammoniais301.9kPa(absoluteatmosphere);2Theammonia–airmixturecontaining9%ammonia(molarfraction)iscontactwiththeammonia-waterliquidcontaining5%ammonia(molarfraction).Underthisoperatingcondition,theequilibr
3、iumrelationshipisy*=0.97x.Whentheabovetwophasesarecontact,whatwillhappen,absorptionorstripping?3Whenthetemperatureis10oCandtheoverallpressureis101.3KPa,thesolubilityofoxygeninwatercanberepresentedbyequationp=3.27´104x,wherep(atm)andxrefertothepartialpressureofoxygeninthe
4、vaporphaseandthemolefractionofoxygenintheliquidphase,respectively.Assumethatwaterisfullycontactwiththeairunderthatcondition,calculatehowmuchoxygencanbedissolvedinpercubicmeterofwater?4Anacetone-airmixturecontaining0.02molarfractionofacetoneisabsorbedbywaterinapackedtower
5、incountercurrentflow.99％ofacetoneisremovedwhenmixedgasmolarflowrateis0.03kmol·s-1m-2andpracticeabsorbentflowrateLis1.4timesasmuchastheminamountrequired.Undertheoperatingcondition,theequilibriumrelationshipisy*=1.75x,volumetotalabsorptioncoefficientisKya=0.022kmol·s-1m-2y
6、-1..Whatisthemolarflowrateoftheabsorbentandhowheightofpackingwillberequired?5ThemixedgasfromanoildistillationtowercontainsH2S=0.04(molarfraction).Triethanolamine(三乙醇胺)isusedastheabsorbenttoremove99%H2Sinthepackingtower,theequilibriumrelationshipisy*=1.95x,themolarfluxrat
7、eofthemixedgasis0.02kmol·m-2·s-1，volumetotalabsorptioncoefficientisKya=0.05kmol·s—1m-2,ThesolventfreeofH2Sentersthetoweranditcontains70%oftheH2Ssaturationconcentrationwhenleavingthetower.Trytocalculate:(a)thenumberofmasstransferunitsNoy,and(b)theheightofpackinglayerneede
8、d,Z.6Ammoniaisremovedfromammonia–airmixturebycountercurrentscrubbingwithwaterinapackedtoweratanatmosphe
