xZnO-CaO催化乙酸甲酯和丙二醇甲醚合成丙二醇甲醚醋酸酯  

Synthesis of propylene glycol methyl ether acetate from methyl acetate and propylene glycol methyl ether catalyzed by xZnO-CaO

作　　者：吴志鹏 李宇斌 刘相洋 闫晓亮[1,2] WU Zhipeng;LI Yubin;LIU Xiangyang;YAN Xiaoliang(College of Chemical Engineering and Technology,Taiyuan University of Technology,Taiyuan 030024,Shanxi,China;State Key Laboratory of Clean and Efficient Coal Utilization,Taiyuan University of Technology,Taiyuan 030024,Shanxi,China)

机构地区：[1]太原理工大学化学工程与技术学院,山西太原030024 [2]太原理工大学省部共建煤基能源清洁高效利用国家重点实验室,山西太原030024

出　　处：《低碳化学与化工》2025年第4期55-63,共9页Low-Carbon Chemistry and Chemical Engineering

基　　金：国家自然科学基金(22278286);中国石油化工集团有限公司项目(122027)。

摘　　要：调控碱性强度是提高CaO基催化剂酯交换反应催化性能的重要方法之一。采用等体积浸渍法制备了不同ZnO质量分数的ZnO-CaO催化剂(xZnO-CaO),并应用于乙酸甲酯与丙二醇甲醚酯交换反应。通过XRD和SEM等表征了xZnO-CaO的物相组成和微观形貌等,利用CO_(2)-TPD研究了ZnO质量分数对xZnO-CaO碱性强度的影响,采用单因素分析法优化了酯交换反应条件。结果表明,ZnO质量分数为5%的ZnO-CaO催化剂(5ZnO-CaO)具有适宜的碱性强度并表现出较好的催化性能,在V(乙酸甲酯)/V(丙二醇甲醚)为10、反应温度为160℃和催化剂用量为0.100 g的条件下反应2 h,其丙二醇甲醚转化率和丙二醇甲醚醋酸酯选择性分别为70.0%和大于98.0%。活性相CaO转化为非活性相Ca(AC)_(2)或Ca(AC)_(2)·0.5H_(2)O是导致催化剂失活的主要原因。失活5ZnO-CaO可通过焙烧获得再生,再生5ZnO-CaO在前述反应条件下的丙二醇甲醚转化率为69.5%。Adjusting alkaline strength is one of the important methods to improve the transesterification catalytic performances of CaO-based catalysts.ZnO-CaO catalysts with different ZnO mass fractions(xZnO-CaO)were prepared by equal volume impregnation method and applied to transesterification of methyl acetate and propylene glycol methyl ether.The phase compositions and micro-morphologies of xZnO-CaO were characterized by XRD and SEM,etc,.The effects of ZnO mass fractions on xZnO-CaO’s alkaline strengths were studied by CO_(2)-TPD.The transesterification conditions were optimized by single factor analysis method.The results show that the ZnO-CaO catalyst with ZnO mass fraction of 5%(5ZnO-CaO)has suitable alkaline strength and good catalytic performance.Under the conditions of V(methyl acetate)/V(propylene glycol methyl ether)of 10,reaction temperature of 160℃,catalyst dosage of 0.100 g and reaction time of 2 h,the propylene glycol methyl ether conversion rate and propylene glycol methyl ether acetate selectivity of 5ZnO-CaO are 70.0%and greater than 98.0%,respectively.The conversion of active phase CaO to inactive phase Ca(AC)_(2) or Ca(AC)_(2)·0.5H_(2)O is the main cause of catalyst deactivation.The deactivated 5ZnO-CaO can be regenerated by roasting,and propylene glycol methyl ether conversion rate of the regenerated 5ZnO-CaO is 69.5%under the above-mentioned reaction conditions.

关 键 词：ZnO-CaO催化剂 酯交换反应 丙二醇甲醚醋酸酯 碱性强度 催化剂再生 

分 类 号：TQ203.2[化学工程—有机化工]