Optimization of Process Variables in the Synthesis of Isoamyl Isovalerate Using Sulfonated Organic Heteropolyacid Salts as Catalysts

Journal of the Brazilian Chemical Society

Keke Chen¹  Wei Yan¹  Xiaofang Zhang¹  Yingying Kuang¹  Xiujuan Tang¹  Xiaoxiang Han¹ 

关键词: heteropolyacids;    ionic liquid;    esterification;    isoamyl isovalerate;    response surface methodology;   

DOI  :  10.5935/0103-5053.20150015

来源: SciELO

【 摘 要 】

Based on single factor experiments, a three level, four variable central composite designs were carried out to establish a quadratic regression model for the catalytic synthesis of isoamyl isovalerate over sulfonated organic heteropolyacid salts as a function of molar ratio of alcohol to acid, reaction time, the amount of water-carrying agent and the amount of catalyst. The optimum conditions were obtained as follows: n (isoamyl alcohol): n (isovaleric acid) = 1.1:1, amount of catalyst was 6.4% of acid, reaction time 2 h and water-carrying agent 10 mL. Under these conditions, the yield of isoamyl isovalerate reached 97.5%. The ionic liquid could be reused six times without noticeable drop in activity. Under optimum conditions, catalysts showed a superior catalytic efficiency and reusability due to better superacidity, lower molecular transport resistance and self-separation characteristics.

【 授权许可】

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