Title: Study on synthesis of methyl oleate catelyzed by 1-alkyl-3-methylimidazolium hydrosulfate
Abstract: Five acidic ionic liquids with an hydrogen sulfate acid group were synthesized(HSO4,n=0,2,4,6,8).Their acidity was studied.Their application in esterification utilizing oleic acid and methanol was explored.The experimental results showed 1-hexyl-3-methyl-Imidulium hydrogen sulphate(HSO4) was the best catalyst of acidic ionic liquid in esterification.Under optimal esterification conditions:n(methanol) ∶n(oleic acid)=2.5∶1,m(oleic acid)∶m(HSO4)=1∶0.08,temperature 90 ℃ and time 14 h,mass fraction of fatty acid methyl ester could reach more than 91%.The ionic liquids were stable and could be reused.Methyl oleate was separated from raw material easily;even if ionic liquid was reused beyond 6 times,the conversion of esterification did not decrease.
Publication Year: 2009
Publication Date: 2009-01-01
Language: en
Type: article
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