异丁烯催化裂解反应的研究

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英文篇名：Study on the catalytic cracking reaction of isobutene 作者：王定博 ; 刘红梅 ; 吴长江 英文作者：Wang Dingbo;Liu Hongmei;Wu Changjiang;Sinopec Beijing Research Institute of Chemical Industry; 关键词：ZSM-5分子筛催化剂 ; 改性 ; 丁烯 ; 催化裂解 ; 丙烯 英文关键词：ZSM-5 zeolite catalysts;;modification;;butylene;;catalytic cracking;;propylene 中文刊名：SYHG 英文刊名：Petrochemical Technology 机构：中国石化北京化工研究院; 出版日期：2019-05-15 出版单位：石油化工 年：2019 期：v.48 语种：中文; 页：SYHG201905002 页数：6 CN：05 ISSN：11-2361/TQ 分类号：12-17

摘要

分别采用磷改性、钙改性和磷-钙同时改性的方法处理成型后的ZSM-5分子筛,得到ZSM-5分子筛催化剂,并研究了催化剂的结构,以及评价了ZSM-5分子筛催化剂对异丁烯、1-丁烯和混合丁烯的催化裂解性能。实验结果表明,催化剂表面的强酸位和弱酸位都能使丁烯裂解,但强酸位还会引发氢转移和芳构化副反应的发生;3种改性方法都可以有效减少催化剂表面的酸性位,提高乙烯和丙烯的选择性,且乙烯和丙烯的产率与丁烯原料的异构体种类无关;与钙改性相比,磷改性和磷-钙同时改性对催化剂性能的改善更显著;在温度为500～560℃时,升高温度可以促进裂解反应,有利于生成乙烯和丙烯;在540℃、0.05 MPa、重时空速16 h~(-1)的条件下,丙烯产率大于29.5%。
        ZSM-5 zeolite catalysts were prepared through treating the molded ZSM-5 zeolite by phosphorus modification,calcium modification or simultaneous phosphorus-calcium modification respectively. The structures of the catalysts were studied,and the catalytic cracking performances of the ZSM-5 zeolite catalysts on isobutene,1-butene and mixed butene were evaluated. It is found that,both strong and weak acid sites on the ZSM-5 catalyst surface can crack butene molecules.However,the strong acid sites also play key roles in the side reactions,such as hydrogen transfer reaction and aromatization. Each kind of the three modification methods could effectively decrease the number of acid sites and improve the selectivity of ethylene and propylene,and the yields of ethylene and propylene are independent of the types of isomers of butene raw materials. Compared with calcium modification,phosphorus modification and phosphorus-calcium modification have more significant improvements in catalyst performance. In the range of 500-560 ℃,the increase of reaction temperature could promote the cracking reactions,which is beneficial to the formation of ethylene and propylene. A propylene yield over 29.5% can be obtained under a reaction temperature of 540 ℃,a reaction pressure of 0.05 MPa and WHSV of 16 h~(-1).

引文

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