Zheng Xiaofen
2014
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Journal
Industrial Catalysis
Abstract
Pentaerythritol derivatives with high symmetrical molecular structures have wide application in the fields of research and industry.It is difficult to achieve the esterification reaction of pentaerythritol and chloroacetic acid in solution due to the dissolution limitation of pentaerythritol.In this paper,using SO2-4/TiO2-SnO2 solid superacid as the catalyst,chloroacetic pentaerythritol tetraester was synthesized by melting solid esterification method under solvent-free condition.The influence of catalyst dosage,molar ratio of reactants,reaction time and reaction temperature on the esterification was investigated.The results showed that chloroacetic pentaerythritol tetraester yield of 98.7% was attained under the optimal reaction condition as follows:catalyst dosage 4% of the total mass of the reactants,n(pentaerythritol) ∶ n(chloroacetic acid) =1∶ 4.2,reaction temperature 170 ℃ and reaction time 6 h.The product was characterized by IR and1 H NMR techniques.