Synthesis of dioctyl phthalate using acid functionalized ionic liquid as catalyst

摘要

Dioctyl phthalate were synthesized by using acid functionalized ionic liquid as catalyst.The results indicated that HSO3-functional- ized Bronsted acidic ionic liquids show better catalytic and reusable performance than non-functionalized ionic liquids or the combina tion of neutral ionic liquids and Bronsted acid.Under the optimum conditions,using l-methyl-3-(3-sulfopropyl)-imidazolium hydrogen sulfate as catalyst,the conversion of phthalic anhydride was 98%.After easily separated from the products the ionic liquid could be reused 8 times without any disposal,and the conversion of phthalic anhydride was not less than 95%.Therefore,an environmental friendly approach for the synthesis of dioctyl phthalate is provided.