选择催化裂化制间二异丙苯反应工艺和催化剂的改性  

Preparation of m-Diisopropylbenzene by Selective Catalytic Cracking of Mixed Diisopropylbenzene over Modified Catalyst

作　　者：王丽华 谭涓[1] 刘靖[1] 

机构地区：[1]大连理工大学精细化工国家重点实验室,辽宁大连116012

出　　处：《石油化工》2010年第10期1104-1109,共6页Petrochemical Technology

摘　　要：在小型固定床反应器上采用纳米HZSM-5分子筛催化剂对混合二异丙苯进行选择催化裂化制间二异丙苯,考察了反应温度和重时空速对选择催化裂化反应的影响,得到的优化反应条件为:常压、反应温度420℃、重时空速3h^(-1)、氮气为载气。在此条件下,8h内的平均结果为:对二异丙苯裂化率89.8%,间二异丙苯收率72.7%,二异丙苯产物中间二异丙苯的质量分数90.2%。反应工艺的研究结果表明,在无载气的条件下,原料中通入苯可减少反应过程的积碳。对纳米HZSM-5分子筛催化剂进行改性的实验结果表明,采用水热处理12h的改性方法可有效提高催化剂的催化性能和稳定性,同时产物中间二异丙苯的含量很高,可有效提高后续分离过程的效率。Nano-HZSM-5 molecular sieve catalyst was applied to selective catalytic cracking of mixed diisopropylbenzenes（DIPB） into m-DIPB in a micro fixed-bed reactor, which could be used in preparation of 1,3-benzenediol. Effects of reaction temperature and WHSV on the selective catalytic cracking were investigated. It was showed that under the conditions of pressure 0. 1 MPa, reaction temperature 420℃, WHSV 3 h^-1 and carrier gas N2, conversion of p-DIPB in the cracking reached 89.8%, and 72.7% m-DIPB yield and 90.2% m-DIPB mass fraction in the product were obtained （the results were the average values in reaction 8 h）. Carbon deposition on the catalyst could be reduced effectively through adding benzene and disusing the cartier gas. The nano-HZSM-5 molecular sieve catalyst was modified by different methods. The results revealed that activity and stability of the nano-HZSM-5 molecular sieve catalyst could be improved significantly through hydrothermal-treatment for 12 h. If m-DIPB mass fraction in the product DIPB is high, efficiency of the subsequent separation process can be heightened.

关 键 词：二异丙苯 间二异丙苯 选择催化裂化 纳米ZSM-5分子筛催化剂 

分 类 号：TQ241.14[化学工程—有机化工]