Wang Xin-rong
2011
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China Surfactant Detergent & Cosmetics
Abstract
Using self-prepared SO42-/TiO2-Al2O3 solid superacid as catalyst,pentaerythritol and isostearic acid were esterified to synthesize pentaerythritol tetraisostearate.Effects of factors,such as molar ratio of isostearic acid to pentaerythritol,the dosage of catalyst,reaction temperature,reaction time on the results of esterification were investigated.The optimal conditions were determined as:n(isostearic acid)∶n(pentaerythritol)=4.3∶ 1,the dosage of the catalyst w=0.060% of total mass of the reactants,reaction time 10 h and reaction temperature 230 ℃.The reaction products were characterized by the FTIR.Results showed that SO42-/TiO2-Al2O3 solid superacid performs good catalytic activity with high reaction selectivity in the process of synthesis of pentaerythritol tetraisostearate.The esterifying conversion achieves more than 97%,and the catalyst could be repeatedly used for five times without significant declining of its catalytic activity.