SO_4^(2-)/TiO_2-Al_2O_3催化合成双季戊四醇六脂肪酸酯

Synthesis of dipentaerythritol hexa-esters catalyzed by SO_4^(2-)/TiO_2-Al_2O_3

以自制SO42-/TiO2-Al2O3固体超强酸为催化剂,进行双季戊四醇和脂肪酸的酯化反应,合成了双季戊四醇六脂肪酸酯,考察了酸醇摩尔比、催化剂用量、反应温度、反应时间等条件对酯化反应的影响。确定了较优的合成条件:n(脂肪酸)﹕n(双季戊四醇)=6.5﹕1,催化剂用量为总反应物质量的0.060%,210℃回流反应6 h。用红外光谱对反应产物进行了表征,结果表明,SO42-/TiO2-Al2O3固体超强酸在双季戊四醇六脂肪酸酯合成反应中有较高的催化活性和高的反应选择性,酯化率达98%以上,且催化剂重复使用8次仍保持较高活性。双季戊四醇六脂肪酸酯产品结构经FTIR表征确认。

With self-prepared SO42-/TiO2-Al2O3 solid super-acid as the catalyst,dipentaerythritol and fatty acid were esterified to dipentaerythritol hexa-esters.Effects of factors,such as molar ratio of fatty acid to dipentaerythritol,the dosage of catalyst,reaction temperature and reaction time on the results of esterification were investigated.The optimal condition was determined as n（fatty acid）∶n（dipentaerythritol）=6.5∶1,the dosage of the catalyst w=0.060% of total mass of the reactants,reaction time 6 h and reaction temperature 210 ℃.SO42-/TiO2-Al2O3 solid superacid shows good catalytic activity and high reaction selectivity in the process of dipentaerythritol hexa-esters synthesis.The esterifying conversion is above 98%,and the catalyst can be repeatedly used for eight times without significant declining of its catalytic activity.The reaction products were characterized by the FTIR.