过碳酸钠反应结晶过程及粒子团聚行为研究

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1、天津大学磷±学位论文过碳酸钠反应结晶过程及粒子团聚行为研究AStudyonReactiveCrystallizationProcessandAgg]【omerationBehaviorofSodiumPercarbonate(申请硕士学位)学科专业：化学工稷研究生：蝴英腰握导教师：尹歇响教授天津大学化工学院二零零五年一胄ABSTRACTASanew—styleoxidationbleachingagent,sodiumpercarbonateiswidelyusedasallassistant融thesynthes

2、isofabstergent．Comparedwiththeoverseasproducts，sodiumpercarbonatewhichmadeinchinalaidinallinferiorpositionbecauseofthelittlebulkdensity,roughgranulesurface，nonuniformparticlesize，poorstabilityandSOon．Therefore，itisnecessarytoimprovetheproducingtechniqueofsodiu

3、mpercarbonate．Inthisthesis，thereactioncrystallizationprocessofsodiumpercarbonatewassystematicallyinvestigated。ThesolubilityofsodiumpercarbonateinwaterWaSmeaSuredusingthelasermethod．SomeinfluencefactorsOnsolubility,suchastemperatureandthequantityofthesalting-ou

4、tagentwereexperimentallystudied．Accordingtotheexperiments，wehavedrawnaconclusionthatbyaddingthesalting-outagentintothereactionsolutionismoreefficaciousforprecipitationofsodiumpercarbonatethanbylowingdownthecrystallizationtemperature．Sointhisworkthemethodofaddi

5、ngsalting-outagentintothesolutionundertheroomtemperatureWasusedtoimprovetheproductionyield．Theoptimaloperationconditionsforthereactivecrystallizationprocessofgranularsodiumpercarbonatewereobtainedafterstudyingtheinfluencesoftemperature，feedcomposition，dropping

6、speed，stirspeed，quantityofsalting-outagentandrecireulatingofmothersolutiononthebulkdensity,contentofeffectualoxygen,stability,andyieldofproduct．Thekineticsmodelsofthereactivecrystallizationprocessofsodiumpercarbonatewerebuiltonthebasisofthepopulationbalanceand

7、thequalitybalanceequations．ThereasonofagglomerationofsodiumpercarbonateWasexploredinordertoimprovethebulkdensityandmakethesurfaceofgranulessmoother．Finallythecrystallizationkineticswithagglomerationagentexistinginthesystemwasinvestigated，andtheagglomerationgro

8、wthmodelofsodiumpercarbonateparticlesWasobtainedwhichisdifferentfromthetraditionalcrystalgrowthmodels。Thepapersuppliedadatabasis赫thefurtherstudyandtheindustrialcrystallizationprodu