化工原理习题答案英文.doc

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1、ProblemsandSolutionsDistillation1、Acontinuousfractionatingcolumnisusedtoseparate4000kg/hofamixtureof30percentCSand70percentCCl.Bottomproductcontain5percentCSatleast,andtherateofrecoveryofCSintheoverheadproductis88%byweight,required.Calculate(a)themolesflowofoverheadproductperhour.(b)themole

2、fractionsofCSandCClintheoverheadproduct,respectivelySolution:FormoverallmaterialbalanceKnownbythejusticeoftheproblemTaketheplaceof3typesandenter2typesTheunitconverts：（molefraction）2、Aliquidcontaining40molepercentmethanoland60molepercentwateristobeseparatedinacontinuousfractionalcolumnat1atm

3、pressure.Calculatethevalueofqunderthethreefollowingconditions(a)thefeedingisliquidat40C(b)thefeedingissaturatedliquid.Theequilibriumdataformethanol-waterliquidat1atmpressurearegivenintheattachedtable.Ifthecolumnisfedwith100koml/h.Themolarfractionsofmethanolinoverheadproductandbottomproducta

4、re0.95and0.04,respectively.Arefluxratioatthetopofcolumnis2.5.Calculate(a)themoleflowofoverheadproductperhour(b)themoleflowofliquidinrectifyingcolumn(c)themoleflowofvaporinstrippingcolumn.Assumethattheconstantmolarflowappliestothissystem.Solution:FormoverallmaterialbalanceSolvetheequtionweca

5、nhave：AndTheseuppervaluesarefixedunderthethreefeedconditions。Thefeedat40℃，q=1.07Feedsaturatedliquid，q=13、Thefeedingatdewpointisfedtoacontinuousfractionatingcolumn,andtheequilibriumrelationsaregivenbyequations:y=0.723x+0.263(inrectifyingcolumn);y=1.25x–0.0187(instrippingcolumn).Calculate(a)t

6、hecompositionsoffeeding,overheadproductandbottomproduct,respectively(b)therefluxratioSolution:TheslopeoftheoperatinglineinrectifyingcolumnisWecanget：R=2.61TheinterceptoftherectifyinglineonyaxisisTheintersectionofthestrippinglineandthediagonalisY=X=XwsoXw=0.0748Formtheintersectionofthesetwoo

7、peratinglines,gives:Becausethefeedatdewpoint,sothefeedlineishorizon,andthecompositionoffeedis6.12Itisdesiredtoproduceanoverheadproductcontaining95.7molepercentAformaidealmixtureof44moleAand50molepercentBfeedingintoacontinuousfractionatingcolumn.Theaverag