硫酸钙晶须催化合成醋酸正丁酯的动力学研究
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摘要
以改性硫酸钙晶须作为催化剂,通过酯交换反应合成醋酸正丁酯,研究反应过程的化学反应动力学。结果表示反应条件为,当酯醇摩尔比为2,硫酸钙晶须添加量为反应总量的3%,超声波频率为25 kHz,反应温度为110℃,反应时间为6h时,得到该反应的活化能Ea=5.243kJ/mol,指前因子k_0=3.8496×10~3mol~(-1)·L·h~(-1),并最终建立了以硫酸钙晶须为催化剂合成醋酸正丁酯r=3.8496×10~3exp(-5243/RT)c_Ac_B。
Modified calcium sulfate whisker was used as the catalyst to synthesize n-butyl acetate by transesterification reaction, and the chemical reaction kinetics of this process was studied. The results showed that, the mole ratio of ester to alcohol was 2,the dosage of whisker was 3%,the ultrasound frequency was 25 kHz, the reaction time was 6 h and the reaction temperature was 110 ℃, the apparent activation energy was Ea=5.243 kJ/mol, and pre-exponential factor was k_0=3.849 6 × 10~3 mol~(-1)· L · h~(-1). Finally, the kinetics model of the ester exchange reaction was established r=3.8496×10~3exp(-5243/RT)c_Ac_B.
Modified calcium sulfate whisker was used as the catalyst to synthesize n-butyl acetate by transesterification reaction, and the chemical reaction kinetics of this process was studied. The results showed that, the mole ratio of ester to alcohol was 2,the dosage of whisker was 3%,the ultrasound frequency was 25 kHz, the reaction time was 6 h and the reaction temperature was 110 ℃, the apparent activation energy was Ea=5.243 kJ/mol, and pre-exponential factor was k_0=3.849 6 × 10~3 mol~(-1)· L · h~(-1). Finally, the kinetics model of the ester exchange reaction was established r=3.8496×10~3exp(-5243/RT)c_Ac_B.
引文
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[12]张连红,田彦文.硫酸钙晶须催化合成三羟甲基丙烷三丙烯酸酯[J].分子科学学报,2009,25(6):375-378.
[2]张连伟.乙酯正丁酯合成的研究迚展[J].当代化工,2005,34(3):173-175.
[3]Zhi-ming TIAN,Qi-gang DENG,Hui SUN,et al.Characterization and Catalytic Performance of La-SO42+/SBA-15 in Esterification of Acetic Acid with n-Butanol[J].Chemical Research in Chinese Universities,2008,24(3):357-361.
[4]王建荣.反应精馏合成乙酸正丁酯的工艺设计[D].兰州大学大学硕士论文,2007.
[5]田立朋,王丼君,王力.硫酸钙晶须制备过程中的兲键技术研究[J].化学工程师,2006,(8):12-14.
[6]龚安华,孙岳玱.纳米晶须材料的研究概述[J].化学工程师,2008,(5):41-43.
[7]江建样,江建坤.高聚物改善道路沥青性能的试验研究[J].化学建材,2000:11-12.
[8]毛常明,阵学玺.石膏晶须制备的研究迚展[J].IM&P化工矿物与加工,2005,(12):34-36.
[9]费文丼,李征芳,王珩.硫酸钙晶须的制备及应用评价[J].IM&P化工矿物与加工,2002,(9):31-32.
[10]孟季茹,赵磊,梁国正,等.无机晶须在聚合物中的应用[J].化工新型塑料,2001,29(12):1-6.
[11]张连红,田彦文.硫酸钙晶须催化合成一缩二乙二醇双甲基丙烯酯酯[J].材料导报:研究篇,2009,23(5):35-37.
[12]张连红,田彦文.硫酸钙晶须催化合成三羟甲基丙烷三丙烯酸酯[J].分子科学学报,2009,25(6):375-378.