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1、PubMedessentialcoursewarecourseware,ninthchaptersevaporate（考研化工原理必备课件第九章蒸发）Thispaperconsistsof821240550contributionsPptdocumentsmayexperiencepoorbrowsingontheWAPside.ItisrecommendedthatyoufirstselectTXT,ordownloadthesourcefiletothelocalview.Theninthchapterisevaporation9.1overview9.2evaporationequ
2、ipment9.3singleeffectevaporation9.4energysaving9.5multieffectevaporationmultieffectevaporation9.1overview(1)applicationofevaporationoperationinindustry:obtainingconcentratedsolutionaschemicalproductorsemi-finishedproductdirectly.Removalofsolvent,solubilizationofthesolutiontothesaturatedstate,andt
3、hencooling,precipitationofsolidproducts,thatis,evaporation,crystallizationofjointoperationtoobtainsolidsolute.Removeimpuritiesandobtainpuresolvent.9.1overview(2)thecharacteristicsofevaporationoperation:boilingpointrising,evaporationofmaterialisdissolvedinnonvolatilesolutesolution.AccordingtoRaoul
4、'slaw,thevaporpressureofpuresolventislowatthesametemperature,sotheboilingpointofthesolutionishigherthantheboilingpointofthepuresolventunderthesamepressure.Therefore,whenthetemperatureoftheheatingsteamisconstant,theheattransfertemperaturedifferenceoftheevaporationsolutionissmallerthanthatofthepure
5、solventevaporation,andthegreatertheconcentrationofthesolution,themoreobvioustheeffectis.Savingenergy9.1overview(3)classification:accordingtotheevaporationoperation,thespacepressurecanbedividedinto:atmosphericpressure,pressure,ordecompression(vacuum)evaporation.Accordingtotheutilizationoftwosteam,
6、itcanbedividedintosingleeffectevaporationandmultieffectevaporation.9.2evaporationequipment9.2.1evaporatorTheevaporatorismainlycomposedofaheatingchamberandaseparatingchamber.Heatingroomsareavailableinmanydifferentwaystomeetdifferentrequirementsofvariousmanufacturingprocesses.Accordingtothemovement
7、ofthesolutionintheheatingchamber,theevaporatorcanbedividedintotwotypes,onecycletypeandonewaytype(nocycle).(1)thecharacteristicsofthecirculationtypeevaporator:thecirculationofthesolutionintheevaporatorcanimprovetheheatt
