罗门哈斯除油树脂资料-英文版

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1、IONEXCHANGERESINSUpdate10Oct2005 WATERDE-OILING(coalescenceprocess)IntroductionTheprocesswasdevelopedaround1980bytheFrenchoilcompanyElf-Aquitaine(nowTotalFinaElf)togetherwithANVAR,agovernmentalresearchinstitute.theresinusedinallexistingplants,wasdiscont

2、inuedbyRohmandHaasinthe1990'sduetoverylowsales.GeneralprincipleoftheprocessThewatercontainingoiltoberemovedispassedthroughabedofionexchangeresinsonwhichasurfactant(afattyamine)hasbeengrafted.Thesurfactantmakestheresinoleophilic,whichmeansitattractsoilmo

3、lecules.Theresinbedisabletoremovehydrocarbonsfromthewater.Additionallyitcanalsoremovesuspendedsolidsbyfiltration.Twooperatingprocessescanbeused:1.Upflowloading(purecoalescence)Theoilywaterpassesthroughtheresinbedfrombottomtotop.Theresinbeadsadsorboilont

4、heirsurface,whichformsafilmaroundthebeadsandprogressivelygrowtomakedroplets.Whenthedropletshavereachacriticalsize,theyfloattothetopofthecoalescerwheretheyareremovedbyskimming.Thebrokenfilmaroundtheresinbeadsgrowsagainandtheprocesscontinuesindefinitely.T

5、hisisaself-regeneratingprocess.2.Downflowloading(coalescenceandfiltration)Theoilywaterpassesthroughthebedfromtoptobottom.Theresinbeadsadsorbtheoilwiththesamemechanismasabove,butoncetheyareheavilyloaded,theymustbebackwashedperiodicallytoremovetheoil.Susp

6、endedsolidsaccumulatedontheresinbedarealsoremoved.Whentheamountofsuspendedsolidsinthefeedishigh,itisrecommendedtoinstallapre-filtrationwithasandfilter.Themostattractivevariantisthefirstone(upflow,purecoalescence)DetailsofthecoalescenceprocessThebigdropl

7、etsrisetothetopfollowingStokes’law:withv=velocityρ=densityofthefluidsη=viscosityg=gravityconstantd=diameteroftheoildropletsImplementationofthecoalescenceprocessThecoalescenceanddecantationstepsareperformedinverticalvessels.Theoilywaterpassesthroughafixe

8、d(notfluidised)resinbedwithaheightof200to400mm,frombottomtotop.Thelinearflowrateisabout10m/h.Theresinhasacoarseparticlesize.Atthesurfaceoftheresinbed,largehydrocarbondropsappearandareseparatedinadecanterabovetheresinbed.Numberedi