催化裂化过程中影响丙烯和丁烯选择性的因素
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摘要
采用ACE评价装置研究了重油催化裂化过程中丙烯和丁烯选择性的影响因素。结果表明:随着反应温度的升高,丙烯、丁烯选择性存在极大值,且丁烯选择性的极值温度低于丙烯;随反应剂油比的增大,丙烯和丁烯选择性均呈下降趋势,但丁烯选择性的下降幅度明显大于丙烯;随择形分子筛ZSM-5含量的增加,丙烯选择性有所提高,但丁烯选择性下降;ZSM-5改性方式同时影响丙烯和丁烯选择性;随Y型分子筛晶胞常数的增大,丙烯、丁烯选择性均下降,且丁烯选择性下降幅度大于丙烯。
ACE(Advanced Catalyst Evaluation)was employed to investigate the factors impacting the selectivities of propylene and butene in the process of catalytic cracking of heavy oil.The results showed that with the increase of temperature,there were maximum values for the selectivities of propylene and butene.But the corresponding reaction temperature for maximum butene selectivity was lower than that of propylene;with the increase of cat-to-oil ratio,selectivities of both propylene and butene decreased.However,the selectivity for butene dropped more than that of propylene;the increase of ZSM-5 zeolite was in favor of propylene,while selectivity of butene decreased.Moreover,modification ways of ZSM-5 had an impact on the selectivities of the both light olefins;with the increase of the molecular sieve cell constant of Y zeolite,the selectivities of the two olefins were decreased and the selectivity of butene decreased more than that of propylene.
ACE(Advanced Catalyst Evaluation)was employed to investigate the factors impacting the selectivities of propylene and butene in the process of catalytic cracking of heavy oil.The results showed that with the increase of temperature,there were maximum values for the selectivities of propylene and butene.But the corresponding reaction temperature for maximum butene selectivity was lower than that of propylene;with the increase of cat-to-oil ratio,selectivities of both propylene and butene decreased.However,the selectivity for butene dropped more than that of propylene;the increase of ZSM-5 zeolite was in favor of propylene,while selectivity of butene decreased.Moreover,modification ways of ZSM-5 had an impact on the selectivities of the both light olefins;with the increase of the molecular sieve cell constant of Y zeolite,the selectivities of the two olefins were decreased and the selectivity of butene decreased more than that of propylene.
引文
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[2] 高永灿,张久顺.催化裂化过程中的热裂化与催化裂化[J].化工学报,2002,53(5):469-472
[3] 王为然,张文斌,王刚,等.FCC汽油二次裂化增产丙烯过程中主要影响因素的研究[J].燃料化学学报,2009,37(1):65-70
[4] 马文明,朱根权,谢朝钢.催化裂化反应中丁烯的生成与转化规律[J].石油化工,2015,44(6):762-769
[5] 沙有鑫,龙军,谢朝钢,等.催化裂解过程中空速和剂油比对液化气生成的影响[J].石油炼制与化工,2012,43(4):1-4
[6] 蔡目荣,丁福臣,易玉峰,等.操作参数对FCC 汽油烯烃度的影响[J].石油与天然气化工,2004,33(5):344-346
[7] 龙军.中孔择形沸石与烃类催化裂化[J].石油炼制与化工,1997,28(7):24-28
[8] 李晓慧,郑庆庆,米硕,等.磷铝复合改性ZSM-5 分子筛及其催化性能[J].化工学报,2016,67(8):3357-3362
[9] 刘欣梅,阎子峰.柠檬酸对USY 分子筛的化学改性研究[J].化学学报,2000,58(8):1009-1014