改性分子筛催化剂催化邻二甲苯选择性氯化  

Study on Selective Chlorination of o-Xylene Catalyzed by Molecular Sieve

作　　者：吕宏飞[1] 张惠[1] 

机构地区：[1]黑龙江省石油化学研究院,黑龙江哈尔滨150040

出　　处：《石油化工》2004年第11期1028-1031,共4页Petrochemical Technology

摘　　要：首先对邻二甲苯的分子动力学直径进行估算,以NH4+,Li+,K+改性的NaX,NaY,ZSM-5分子筛为催化剂,研究邻二甲苯的选择性氯化,探讨选择性催化氯化的反应机理。实验发现,分子筛的孔道结构及其酸中心的种类和酸性强弱是影响氯化选择性的决定性因素。在80℃时,用氯气氯化邻二甲苯,Y型分子筛表现出较好的对位选择性。当以KY型分子筛为催化剂时,4-氯代邻二甲苯和3-氯代邻二甲苯的摩尔比可达1.6以上。同时考察了反应时间、反应温度、催化剂用量及氯气流量等因素对氯化选择性的影响。Minimum cross-sectional kinetic diameter of o-xylene and (OX) its chlorinated derivatives were calculated. Liquid phase chlorination of o -xylene was investigated by using a series of alkali/alkali earth cationexchanged (NH4+,Li+ ,K+) molecular sieves (NaX,NaY,ZSM^5) as catalysts. The reaction was carried out under atmospheric pressure. The pore structure of molecular sieves, type and strength of acid site on molecular sieves were key factors influenced chlorination selectivity of o-xylene. KY molecular sieve showed the highest p -chloro-o-xylene selectivity at 80℃,under atmospheric pressure,and m(4-Cl-OX)/m(3-Cl-OX)>1.6. Effects of reaction time, temperature, dosage of catalyst, and flow rate of chlorine on yield and selectivity of p-chloro-o-xylenes were also investigated.

关 键 词：邻二甲苯 分子筛 选择性氯化 机理 氯代邻二甲苯 

分 类 号：TQ242.1[化学工程—有机化工]