摘要
采用重油催化裂解多产丙烯专用催化剂R0,考察了燕山FCC汽油C5窄馏分的催化裂解反应特性。由于热裂解反应和催化裂解反应的反应机理不同,对于C5窄馏分,其中的烷烃热裂解反应转化率高于烯烃热裂解反应转化率;而烯烃的催化裂解反应转化率高于烷烃的催化裂解反应转化率,且催化裂解反应的丙烯收率较高。C5窄馏分的催化裂解反应中,C5烯烃转化率随温度变化较小,C5烷烃转化率随温度升高显著增加,且丙烯选择性随温度先增加后降低,表明烯烃更易于生成丙烯;C5烷烃转化率和C5烯烃转化率均随质量空速的增加而降低,且C5烷烃转化率下降更显著;C5烷烃转化率和C5烯烃转化率均随催化剂积炭量的增加而降低,且C5烷烃转化率降低更为显著。当催化剂积炭量达0.44%后,烷烃的催化裂解反应消失,烷烃转化率完全由热裂解反应所控制。
The reactive characteristics of catalytic pyrolysis for C5 narrow distillation of Yanshan gasoline were investigated over R0 catalyst which was specially designed for producing more propylene from heavy oil. Due to different mechanisms for respective thermal and catalytic pyrolysis reactions, the conversion of paraffins was higher than that of olefins in thermal pyrolysis reaction of C5 distillation, while the conversion of olefins was higher than that of paraffins in catalytic pyrolysis reaction of C5 distillation over R0 catalyst, and the yield of propylene in catalytic pyrolysis reaction was higher than that in thermal pyrolysis reaction. In catalytic pyrolysis reaction of C5 distillation, the conversion of olefins varied in relative small scale with the change of reaction temperature, while the conversions of paraffins significantly increased with the increase of reaction temperature, and the selectivity of propylene exhibited the trend of increasing firstly and then decreasing. All these implied that olefins were more favorable for propylene production. Both the conversions of paraffins and olefins in the catalytic pyrolysis reaction of C5 hydrocarbons decreased with respective increase of space velocity and coke deposition amount on catalyst, and more significant decrease of paraffins conversion was found. The catalytic reaction of paraffins disappeared when the coke deposition amount on catalyst reached 0.44%, and then the conversion of paraffins was totally led by thermal pyrolysis reaction.
出处
《石油学报（石油加工）》
EI
CAS
CSCD
北大核心
2012年第5期769-774,共6页
Acta Petrolei Sinica(Petroleum Processing Section)
基金
国家重点基础研究发展规划"973"项目(2012CB224800)资助
关键词
C5窄馏分
转化率
选择性
质量空速
积炭
C5 narrow distillation
conversion rate
selectivity
mass space velocity
coke deposition
