水滑石組成和結(jié)構(gòu)對(duì)其酯交換反應(yīng)催化活性及壽命的影響.pdf

1、華中科技大學(xué)碩士學(xué)位論文水滑石組成和結(jié)構(gòu)對(duì)其酯交換反應(yīng)催化活性及壽命的影響姓名：于琴琴申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：有機(jī)化學(xué)指導(dǎo)教師：李光興20050510IIAbstractDiphenylcarbonate(DPC)isanimptantprecursfthesynthesisofpolycarbonatewithoutusingphosgenetransesterificationofdimethylcarbonatewithpheno

2、lisconsideredtobethemostpromisingprocess.Hydrotalcitelikecompounds(HTLcs)exhibithighcatalyticactivityuniqueivityinmanyreactionsribedtotheirspecialstructurechemicalpropertiesHTLcswereedasthecatalystsfthesynthesisofDPCinth

3、ispaper.TheeffectofthestructurechemicalcomponentsofHTLcsonthecatalyticactivityhasbeeninvestigated.ThelamellarstructureofHTLcsshowedsignificanteffectonthetransesterificationthecatalyticactivityofHTLcsisrelatedtothecompone

4、nts.HTLcsdecomposeathightemperaturewiththechangingofthecomponentsstructuresothestabilityofHTLcshasbeenstudied.TheresultsshowedthatMgAlhydrotalcitewithCO32astheinterlayeranionexhibitedpreferablecatalyticactivitystability.

5、Underthereactionconditionsofn(Phenol)n(DMC)=4massfractionofcatalyst=1.5%T=160~190oCt=8hyieldofDPCMPCwas13.9%19.9%respectivelytheivityftransesterificatedproductswas90.6%.ThecatalyticactivityofMgAlhydrotalcitealmostunchang

6、edafterthreerecycles.ZnAlhydrotalciterevealedexcellentcatalyticactivityinthetransesterificationunderthesamereactionconditionsbothyieldofDPCMPCreached19.8%theivityftransesterificatedproductswas90.4%.HoweverZnAlhydrotalcit

7、eshowedpostabilityrathershtlifetime.ItisobviousthatthecarbonatedMgAlhydrotalciteispromisingtobeusedintheindustrialprocess.FurthermeseveralkindsofnanoHTLcshavebeenpreparedbycoprecipitationunderultrasonicradiationwithwellc

8、rystallizationthecatalyticactivityofthemhasbeentested.TheresultsindicatedthatHTLcspreparedbythismethodexhibithighercatalyticactivitythantheroutinecoprecipitationmethodwhenthecarbonatedMgAlhydrotalcitewasusedasthecatalyst