Abstract:

With self-prepared SO₄^2-/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 ℃. SO₄^2－/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.