用β沸石作催化剂合成丙酸戊酯的研究  

Studies on the Synthesis of Amyl Propionate Using β Zeolites as Catalysts

作　　者：赵瑞兰[1] 赵振华[1] 侯雁[1] 

机构地区：[1]湖南师范大学化学化工学院化学系,中国长沙410081

出　　处：《湖南师范大学自然科学学报》2002年第4期50-54,共5页Journal of Natural Science of Hunan Normal University

基　　金：湖南省教委科研基金资助项目(99C59)

摘　　要：用β沸石作催化剂合成丙酸戊酯,考察催化剂制备方法和合成条件对催化性能的影响.合成丙酸戊酯的最适宜条件如下:醇/酸摩尔比为1.2∶1,催化剂用量为1.2g/mol丙酸,环己烷用量为5.0mL/mol丙酸,反应温度为138～144℃,反应时间为3h,在此条件下反应所得产物经气相色谱分析,酯产率接近80%,对酯产物做红外光谱分析和物理性质测定,实测值与文献值吻合.同时对催化剂的稳定性及催化剂的类型对丙酸转化率的影响进行研究.丙酸与正戊醇在Fe β沸石存在下酯化反应的活化能为40.07kJ/mol,并提出了无催化剂和用Fe β沸石为催化剂时的酯化反应动力学模型.Amyl propionate was synthesized using β zeolites as catalysts. The effects of the methods of preparing catalyst, and reaction conditions on the catalytic properties have been investigated. The appropriate conditions for synthesizing amyl propionate were as follows: The molar ratio of amyl alcohol to propionic acid = 1.2:1, the amount of catalyst used = 1.2 g/mol propionic acid, the amount of cyclohexane used = 5.0 mL/mol propionic acid, reaction temperature = 138 ∼ 144 °C, and reaction time = 3 h. The yield, which was determined by GC, of amyl propionate obtained under the above appropriate conditions was close to 80%. The esterified product was characterized by IR, and its physical constants were determined. The experimental values obtained were consistent with the literature values. In addition, the activity steability of β zeolite catalysts, and the effect of the type of the catalysts on the conversion of propionic acid were investigated. The determined activation energy for the esterification reaction of propionic acid with n-pentanol over Fe-β zeolite is 40.07 kJ/mol. The kinetic equations for the esterification reactions carried out in the absence of catalyst and in the presence of Fe-β zeolite, were established, respectively.

关 键 词：Β沸石 催化剂 丙酸戊酯 合成条件 戊醇 丙酸 酯化反应 催化性能 

分 类 号：O623.624[理学—有机化学] O64[理学—化学]