焦化汽油催化裂解反应特性探析
|
摘要
分析了典型焦化汽油的烃类组成特点,重点研究了焦化汽油催化裂解反应过程中影响反应转化率以及低碳烯烃产率和选择性的主要因素。结果表明:催化裂解反应条件下焦化汽油转化率较低,提高反应温度是提高低碳烯烃产率的有效手段,但是目标产物的选择性变化不大;采用高选择性的催化剂可以在提高乙烯和丙烯产率的同时提高其选择性,并达到少产丁烯的目的;焦化汽油的正构烷烃转化程度较低,尤其是C_5~C_7正构烷烃,这是因其分子碳链短,所形成的正碳离子的β断裂反应不易发生所致。
Based on the analysis on composition characteristics of coker gasoline,coker gasoline cracking experiments over zeolite catalyst were conducted in a laboratory fixed fluidized bed reactor.The main influence factors on reaction conversion,yields and selectivities of light olefins of coker gasoline cracking were studied.The results indicated that the conversion of coker gasoline is low under the cracking reaction conditions.Increasing reaction temperature is one of the effective ways to promote the yields of light olefins;however,the selectivity of the target products changes little.The yields and selectivities of ethylene and propylene can be enhanced simultaneously by employing a new high selectivity catalyst along with lower butylene yield.The conversion degree of alkanes in coker gasoline,especially for C_5—C_7,is lower due to the fact that-βscission is not easy to occur for cabonium ion with less than 7 carbon atoms.
Based on the analysis on composition characteristics of coker gasoline,coker gasoline cracking experiments over zeolite catalyst were conducted in a laboratory fixed fluidized bed reactor.The main influence factors on reaction conversion,yields and selectivities of light olefins of coker gasoline cracking were studied.The results indicated that the conversion of coker gasoline is low under the cracking reaction conditions.Increasing reaction temperature is one of the effective ways to promote the yields of light olefins;however,the selectivity of the target products changes little.The yields and selectivities of ethylene and propylene can be enhanced simultaneously by employing a new high selectivity catalyst along with lower butylene yield.The conversion degree of alkanes in coker gasoline,especially for C_5—C_7,is lower due to the fact that-βscission is not easy to occur for cabonium ion with less than 7 carbon atoms.
引文
[1]延迟焦化新工艺如何实现清洁生产[EB/OL].http:∥news.cnpc.com.cn/system/2015/04/24/001538965.shtml,2015-04-24
[2]罗勇.焦化汽油改质方案的比较[J].石油炼制与化工,2002,33(2):66-68
[3]王林.直馏汽油掺炼焦化加氢汽油作重整原料[J].内蒙古石油化工,2007(9):147-148
[4]龙伟灿,陈郑.焦化汽油加氢后流向优化[J].石油炼制与化工,2010,41(8):6-10
[5]李成霞,张强,李春义,等.焦化汽油催化裂化改质的反应条件研究[J].炼油技术与工程,2005,35(6):11-14
[6]孙金鹏,山红红,李春义,等.焦化蜡油两段提升管催化裂解多产丙烯与焦化汽油改质研究[J].石油炼制与化工,2011,42(11):46-51
[7]赵赞立,孟凡东,闫鸿飞,等.FDFCC工艺加工焦化汽油的工业实践[J].中外能源,2015,20(8):80-83
[8]陈俊武,曹汉昌.催化裂化工艺与工程[M].2版.北京:中国石化出版社,2005:1330
[9]2020全国推广乙醇汽油,MTBE和烷基化油市场空间将受冲击?[EB/OL].https:∥www.baidu.com/home/news/data/newspage?source=pc&nid=9949343645779177831&n_type=1&p_from=4,2017-09-27
[10]许友好,屈锦华,杨永坛,等.MIP系列技术汽油的组成特点及辛烷值分析[J].石油炼制与化工,2009,40(1):10-14
[11]汪燮卿,舒兴田.重质油裂解制轻烯烃[M].北京:中国石化出版社,2015:58-60
[12]林世雄.石油炼制工程[M].4版.北京:石油工业出版社,2009:302
[2]罗勇.焦化汽油改质方案的比较[J].石油炼制与化工,2002,33(2):66-68
[3]王林.直馏汽油掺炼焦化加氢汽油作重整原料[J].内蒙古石油化工,2007(9):147-148
[4]龙伟灿,陈郑.焦化汽油加氢后流向优化[J].石油炼制与化工,2010,41(8):6-10
[5]李成霞,张强,李春义,等.焦化汽油催化裂化改质的反应条件研究[J].炼油技术与工程,2005,35(6):11-14
[6]孙金鹏,山红红,李春义,等.焦化蜡油两段提升管催化裂解多产丙烯与焦化汽油改质研究[J].石油炼制与化工,2011,42(11):46-51
[7]赵赞立,孟凡东,闫鸿飞,等.FDFCC工艺加工焦化汽油的工业实践[J].中外能源,2015,20(8):80-83
[8]陈俊武,曹汉昌.催化裂化工艺与工程[M].2版.北京:中国石化出版社,2005:1330
[9]2020全国推广乙醇汽油,MTBE和烷基化油市场空间将受冲击?[EB/OL].https:∥www.baidu.com/home/news/data/newspage?source=pc&nid=9949343645779177831&n_type=1&p_from=4,2017-09-27
[10]许友好,屈锦华,杨永坛,等.MIP系列技术汽油的组成特点及辛烷值分析[J].石油炼制与化工,2009,40(1):10-14
[11]汪燮卿,舒兴田.重质油裂解制轻烯烃[M].北京:中国石化出版社,2015:58-60
[12]林世雄.石油炼制工程[M].4版.北京:石油工业出版社,2009:302