甲醛-乙醛反應(yīng)特性及其羥醛縮合反應(yīng)的初步研究.pdf

1、同濟大學(xué)碩士學(xué)位論文甲醛乙醛反應(yīng)特性及其羥醛縮合反應(yīng)的初步研究姓名：臧紅霞申請學(xué)位級別：碩士專業(yè)：化學(xué)工程與技術(shù)指導(dǎo)教師：錢君律伍艷輝20050301AbstractABSTRACTThecondensationreactionsofaldehydesaswellasofketonesarewidelyusedinorganicsynthesismainlybecausetheyleadtoCCbondformation.Inchemi

2、calindustryformaldehydeaswellasacetaldehydeischeapandabundant.Theiraldolcondensationcanproduce3hydroxypropanal.Andbyhydrogenating3hydroxypropanal13propanediolcanbederivedwhichisanimportantcompoundtoproducepolytrimehtylen

3、eterephthalate(PTT).Inthisthesistheprimaryresearchaboutthealdolcondensationofacetaldehydewithformaldehydeinliquidphaseiscarriedout.3HydroxypropanalfromhydrationofacroleinaswellasotherproductsandmaterialsareanalyzedbyGCMS

4、andHighchemMassfrontier3.0software.Characteristicsofreactionofformaldehydeandacetaldehydearestudiedthroughexperimentalandtheoreticalanalysis.Thecatalystsforthecondensationofaldehydesarescreened.Liquidcatalystssuchassodiu

5、mhydroxideorpotassiumhydroxidesolutionispreferabletherecommendedcontentofalkalineisn(cat.CH3CHO))=0.020.1.InaqueoussolutionformaldehydeundergoesaCannizaroreactioninthepresenceofalkalies.Asmallamountofacroleinisproducedon

6、lyinfewexperiments.Thereasonforthisphenomenonmaycomefromtheformationofglycolfromformaldehydeoracetaldehydeinwater.Aldolcondensationismorelikelytobehappenedatthetemperatureof5300C.Isopropanoland2ethylhexanolwithdefinitepo

7、larirityaregoodsolvents.More3Hydroxypropanal(YMAx13.58%)andacrolein(YmAx9.05%)canbeproducedwhenthecrosscondensationusingnewdistilledaldehydes.Furthercondensationamongproductsformaldehydeandacetaldehydecanproceededinlongr

8、eactionbecauseofhighactivityofmaterialsandaldolproducts.Thereactionshouldendinlessthan2.5h.Catalystsandreactionconditionshouldbeoptimized.Theretentiontimeofmaterialsinthereactorandreactionandseparationexecutingsimultaneo