Vc棕櫚酸酯制備工藝的研究.pdf

1、河北科技大學碩士學位論文Vc棕櫚酸酯制備工藝的研究姓名：楊立會申請學位級別：碩士專業(yè)：化學工程與技術指導教師：李小云20120524AbstractExperimentadoptthesmfHcaCidesterificationmemodtopreparVcpalmitate，tllee髖ctsofstallingreactiontime，reactiontemperature，t11emolarratioofPalmiticacid

2、a11dVc，stildngreaCtiontime，amouIltofsul如響cacid，aIldsulf砸cacidconcentrationonmeyieldafepanicularlyresearchedAndthetecⅢquedconditionsareoptimizedbyonhogonalexperimentaldesignAndgoodtechniquesconditionsaIldyieldarereceiVed，

3、tllemolarmtioofPa】miticacida11dVcis12，鋤ountofsul觚cacidis25mL，ttlereactiontemperatureis28℃，也estallingreactiontiIIleis19h，tllesti仃ingreactiontimeis2h，andmeyieldofcmdeproductsis6807％111mechoiceofprecipitationagent，weuSeamix

4、tureoficewaterandemylacetate，andstudythee丘bctSofdiabrentratioofice、vatera11detllylaCetateonthec11Jdeproductprecipitatedstate，fil缸ation，andtlleyieldT11jsmethodaVoidemulsificationandgainbetter伊ainshapeItmakestllecmdeproduc

5、tssepar撕oneasilyauldthebestVol啪eproportionofice、vatera11detllylacetateisl：029111ordert0slowdo、ⅣnorirmibitmeoxidationofVc，weaddaIltioxidantsyne畫sticagent舶mt11eexperiment，wec鋤ob“nemebestsyne唱istice行ectisph”icacid，鋤d也esuita

6、bleaddition鋤ountis175g，produCtyieldfinallyreached7131％，tlle324％highcrthaulmeoriginalIntlle叫fica：tionprocess，weresearCh吐圮efrectsoftheextractiontemperature鋤dt11evol啪eratiooftoluenewateronttleyieldofproductS，andtlleenectsof

7、t11erecrystallisationofmeblendedliquorofhexaIleaIldemanol0ntheyiledofproducts，andstudyontllebestproportionofblendedliquorofhexaneandetllan01111ebestp面ficationconditioIlSandme妒ledareobtainedEx仃actiontemperatureoftolueneis

8、8℃，Vol啪eratiois10：1，thebestpropoltionofmeblendedliquorofhex勰eandetIlallolisl：O5，nleyiledofproductSis7426％TheproductSistestcdbymeltingpoint，iodinetitration，hi曲pe—、o咖anceliquidcllromato伊印hy，infraredabS0叩tionspectn姍，andtlle

9、resultSindicatedmecontentofVcpalmita_teirIⅡ他Selfmadeproductis9782％也emel婦gpiontis109℃一114℃111eproductShavegoodo刪appe蚴ce鋤dStablecolouThequalityofp剃uCtSanaintothestan出瞰lsofGBl63141996KeyWbrdsVcpalmitate；Diren∞terification；y