7/28/2015 IntroductiontoDistillationhttp://lorien.ncl.ac.uk/ming/distil/distiltyp.htm 1/1IntroductionTypesofColumnsBasicEquipmentandOperationColumnInternalsReboilersDistillationPrinciplesVapourLiquidEquilibriaDistillationColumnDesignEffectsoftheNumberofTraysorStagesFactorsAffectingOperationCrosswordOtherResourcesCopyrightInformationVisitoursponsorBacktotheNotesSectionTYPESOFDISTILLATIONCOLUMNSTherearemanytypesofdistillationcolumns,eachdesignedtoperformspecifictypesofseparations,andeachdesigndiffersintermsofcomplexity.BatchandContinuousColumnsOnewayofclassifyingdistillationcolumntypeistolookathowtheyareoperated.Thuswehave:batchandcontinuouscolumns.BatchColumnsInbatchoperation,thefeedtothecolumnisintroducedbatchwise.Thatis,thecolumnischargedwitha'batch'andthenthedistillationprocessiscarriedout.Whenthedesiredtaskisachieved,anextbatchoffeedisintroduced.ContinuousColumnsIncontrast,continuouscolumnsprocessacontinuousfeedstream.Nointerruptionsoccurunlessthereisaproblemwiththecolumnorsurroundingprocessunits.Theyarecapableofhandlinghighthroughputsandarethemostcommonofthetwotypes.Weshallconcentrateonlyonthisclassofcolumns.TypesofContinuousColumnsContinuouscolumnscanbefurtherclassifiedaccordingto:thenatureofthefeedthattheyareprocessing,binarycolumnfeedcontainsonlytwocomponentsmulticomponentcolumnfeedcontainsmorethantwocomponentsthenumberofproductstreamstheyhavemultiproductcolumncolumnhasmorethantwoproductstreamswheretheextrafeedexitswhenitisusedtohelpwiththeseparation,extractivedistillationwheretheextrafeedappearsinthebottomproductstreamazeotropicdistillationwheretheextrafeedappearsatthetopproductstreamthetypeofcolumninternalstraycolumnwheretraysofvariousdesignsareusedtoholduptheliquidtoprovidebettercontactbetweenvapourandliquid,hencebetterseparationpackedcolumnwhereinsteadoftrays,'packings'areusedtoenhancecontactbetweenvapourandliquidPrevious Next[visitoursponsor]anintroductionCopyright19972009byM.T.Tham