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Chapter9GasAbsorptionMaintasksoftowercalculationcountercurrentCo-currentCalculationofabsorptiontowerV,Y2（1）astraightline，theslopeisL/V；（2）passingpoints(X1,Y1)and(X2，Y2).taskgivenV,Y1andY2,orV,Y1and，findL（orL/V）andX1Theverticaldistancebetweentheequilibriumcurveandtheoperationlineisthegasbaseddrivingforce.Thehorizontaldistanceistheliquidbasedabsorbdrivingforce.Thechangeof（Y-Y*）or（X*-X）showsthechangeofabsorbdrivingforcealongthetowerheight.Y1=y1/(1-y1)=0.1/0.9=0.1111Y2=Y1(1-h)=0.1111×(1-0.95)=0.0056GA=V(Y1-Y2)=39.3×(0.1111-0.0056)=4.148kmol/hmistakesoftenoccurred（1）V=qv1=1000m3/h—Vshouldbemolarflowrate,kmol/h（2）V1=1000/22.4—qV1isnotunderthestandardstateandshouldbecorrected.（3）V=V1—V1istheflowrateofgasmixture,nottheinertgas.（4）GA=V（y1-y2）——yshouldbeexchangedtoY.determinationofsolventflowrateminimumliquid/gasratio,（L/V)minForprotrudingequilibriumcurveNeededsolventflowrate,L——suitableliquid/gasratiocalculationequationforpackingheightmasstransferareaIntower,YandXvarywiththeheight，and△Y（△X）changewithZ,too.TakepositivedirectionofZfromtoptobottomandadifferentialheightdZ,wehavetowerheightforlowconcentrationabsorption
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