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1、如何用真空蒸发结晶法制取无水硫酸钠的方法（Howtoobtainanhydroussodiumsulfatebyvacuumevaporationcrystallization）LiShuping,LiuYouzhi(Departmentofchemicalengineering,NorthChinaInstituteoftechnology,Shanxi,Taiyuan030051,China)Anhydroussodiumsulfateorsodiumsulfate,sodiumsulfide,widelyusedinthepr
2、oductionofwaterglassandultramarineetc.canalsobeusedinthemanufactureofglass,paper,washingagent,soap,dyes,syntheticfiber,leather,medicineandceramicindustries,isanimportantchemicalrawmaterial1.1experimentalprincipleThecommonlyusedmethodofproducinganhydroussodiumsulfatewit
3、hmirabilitedehydration,transformation,by-productmethod,calciummirabilitemethod1mirabilitedewateringmethodisdividedintopervaporationdehydration,hotmeltevaporationdehydrationandthawoutdehydration[2.Theauthoradoptsthewaterringvacuumpumpvacuum,usingD(TBguidetube-baffleplat
4、etypecrystallizerandmethod)directlyfromtheindustrialcoarsemirabilitecrystallizationofanhydroussodiumsulfateandthemethodhasshortprocess,lessequipment,lessinvestment,productsizeandpuritybyvacuumevaporationandcrystallization.Theadvantagesofeasycontrol.Accordingtothediagra
5、m[1]phaseequilibriummaterial(Fig.1)youcandeterminewhat,toformthematerialcrystallizedfromsolution.FromthecurveinFigure1canbeseenthatthesolubilitycurveofsodiumsulfateis3B,C,Apoint,Bpoint.Whenthetemperatureis32.4DEGT<32.4DEGC,sodiumsulfateinwaterThesolubilityinthesolution
6、increasesrapidlywiththeincreaseoftemperature,andthesaturatedsolutionisbalancedsolidis10watersodiumsulfate;andwhenthe32.4C7、rthorhombicsodiumsulfate.Therefore,whenT>32.4DEGC,sodiumsulfatesolutiontoachievefullfigure1sodiumsulfateandwatersystemphasediagramandwhentherewillbeanhydroussodiumsulfateprecipitate.ThisdeterminestheFig.1TfromcoarsemirabilitehephaseequilibriumofNa2SO4forpreparationofan
8、hydroussodiumsulfate2H2Omustbeusedinevaporationcrystallizationmethod.2selectionofcrystallizerAlphaDTBmoldisakindofmol
