分子蒸餾過程稀薄氣體的流動及天然產(chǎn)物提純的研究

1、天津大學(xué)碩士學(xué)位論文分子蒸餾過程稀薄氣體的流動及天然產(chǎn)物提純的研究姓名：王淑華申請學(xué)位級別：碩士專業(yè)：化學(xué)工程指導(dǎo)教師：許松林20050101ABSTRACTABSTRACTMoleculardistillation①毋)，whichalsodefinedasshortpathdistillation(SPD)，isaspecialseparationtechnologywithoutboiling，nonequilibriumandc

2、ontinualdistillationprocessathighvacuumconditionSinceMDcameoutin1930s，enormousdevelopmentsofMDhasbeenacquiredwithitslotsofvirtuesespeciallytremendousexcessinseparatingthermalsensitivenaturalproductHoweverlackofdeepstudie

3、sonMDmadethemoleculardistillatoryinindustryrestrainedTherefore，combined誦tllmassandheattransferinliquidfilmitisimportantforoptimizirlgoperationconditionandenlargingequipmenttostudyrarefiedgasflowingindistillator)Inthisdis

4、sertation，thespaceindistillatoryisdividedintothreesections，includingevaporatingkineticlayersteadyflowinglayerandcondensingkineticlayenInfact，rarefiedgasflowingisproducedbytemperaturedifferencebetweenevaporationsurfaceand

5、condensationsurfaceTheflowingprocesswhichCanbesimplyregardedasonedimensionflowing，isstudiedonbasisofenergyconservationlawandmulti—compositionmomentequationoftwoparallelplanesManypropertiesofrarefiedgascanbeestablishedbyf

6、ourmomentequation，includingmacroscopicandmicroscopicproperties，massandheattransferequationsWhat’Smore，theseequatiomaresolvedwithDelphiprogram。ThemathematicalmodelsCanpredicttheprofileofrarefiedgas，suchasnumericaldensityk

7、inetictemperatureandmacroscopicvelocityandtheprofileofdistillate，tooSotheflowingmodelmakeitpossibletoapplyexperimentaldistillatorytoindustrialequipmentTheinfluenceofOperatingandstructureparametersonmasstransferefficiency

8、andseparationefficiencyisstudied，includingcompositioninliquidfilm，partialpressureofinertgas，evaporationandcondensationtemperature，anddistancebetweenevaporatingandcondensingsurfacesItcarlbeconcludedfromsimulationthatmacro

9、scopictemperatureinsteadyflowinglayerfailswithvelocitygrowingwhenevaporatingandcondensingtemperatureareconstantandthatmasstransferefficiencyandseparationefficiencyaredecreasingwithevaporatingtemperatureincreasingHowevert

10、hemasstransferefficiencyissensitiveforcondensingtemperatureBesides，theeffectofdistanceoftwosurfacesonmasstransferefficiencyandseparationefficiencyisquiteweekwhethertakinginertpartialpressureintoconsiderationornotThetechn