资源描述:
《pubmed essential courseware courseware, ninth chapters evaporate(考研 化工原理 必备课件第九章 蒸发)》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
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