以磷钨酸为催化剂的丁二酸二丁酯的合成及其动力学研究.pdf

21 4 No.4 Vol.21 2007 8 Journal of Chemical Engineering of Chinese Universities Aug. 2007 1003-9015(2007)04-0627-06 , , , , ( , 450002) 3.0:1 1.1 22 2 h99.47% − 1 − 1 − 1 Ea =80.435 kJ⋅mol k0 =7.066×108 mol ⋅L⋅min TQ225.242 O623.624.2 A Study on Synthesis of Dibutyl Succinate Catalyzed by Phosphtungstic Acid and its Reaction Kinetics SUN Xiao-Bo, HUANG Qiang, REN Ke, FENG Yang, LIU Guo-ji (Department of Chemical Engineering, Zhengzhou University, Zhengzhou 450002, China) Abstract: Dibutyl succinate was synthesized by using succinate acid and n-butanol as reactants, phosphotungstic acid as catalyst and toluene as azeotropic agent. The optimum synthesis conditions affecting the yield of dibutyl succinate, such as the amount of catalyst, molecular ratio of n-butanol to succinate acid, amount of azeotropic agent used and reaction time, were investigated by the experiments according to uniform design. The results indicate that 99.47% yield of dibutyl succinate could be obtained with following optimal reaction conditions: the molecular ratio of n-butanol to succinate acid 3.0:1, the amount of catalyst 1.1% by mass of acid, the amount of azeotropic used 22% of total mass and the reaction time 2 h. The kinetic parameters, such as the apparent activation energy Ea and the frequency factor k0, were obtained by regression of the experimental data achieved under various reaction conditions, and the kinetic equation of the esterification reaction