Catalytic Synthesis of Di-2-ethylhexyl Maleate by Aluminium Oxide
Wu Zhikun, Dai Qing, Li Juren, Gong Jian (College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha 410081)
Aluminium oxide was first used for the synthesis of di-2-ethylhexyl maleate. The optimum conditions were as follows: the molar ratio of 2-ethylhexanol to maleic anhydride was 3. 0 : 1, the reaction time of reflux was 1 h, the amount of catalyst was 4 wt. % of that of maleic anhydride. The conversion of maleic anhydride was 99. 5% , and the yield of product reached 88. 1%. The catalyst had some advantages, such as easy to obtain with low price, feasible to be used repeatedly, and less pollution to the environment.