催化裂化原料烃类组成对低碳烯烃生成的影响  

EFFECT OF HYDROCARBON COMPOSITION OF CATALYTIC CRACKING FEEDSTOCK ON THE PRODUCTION OF LIGHT OLEFINS

作　　者：白旭辉 韩月阳 左严芬 王新[1] 杜令印 Bai Xuhui;Han Yueyang;Zuo Yanfen;Wang Xin;Du Lingyin(SINOPEC Research Institute of Petroleum Processing,Beijing 100083)

机构地区：[1]中国石化石油化工科学研究院,北京100083

出　　处：《石油炼制与化工》2022年第9期27-32,共6页Petroleum Processing and Petrochemicals

基　　金：中国石油化工集团公司“十条龙”项目(120001)。

摘　　要：采用固定流化床反应装置,以加氢减压蜡油HVGO-1、HVGO-2、HVGO-3、HVGO-3轻馏分和HVGO-3重馏分为原料,考察了催化裂化原料烃类组成对低碳烯烃生成的影响。结果表明:与密度、氢含量相近的HVGO-1相比,HVGO-2中环烷烃含量高、芳烃含量低是低碳烯烃产率高的原因;HVGO-3、HVGO-3轻馏分和HVGO-3重馏分反应得到相同规律,即链烷烃、环烷烃和烷基苯是生产低碳烯烃和汽油的优势组分,其中,链烷烃和环烷烃是生成低碳烯烃的高价值组分,烷基苯是多产汽油和轻芳烃(BTX)的高潜能组分;HVGO-3轻馏分和HVGO-3重馏分在相同反应条件下,由于HVGO-3轻馏分中环烷基苯含量高,促使低碳烯烃前身物及低碳烯烃发生氢转移副反应,影响低碳烯烃生成;催化裂化原料加氢预处理通过控制加氢深度,实现多环芳烃超深度加氢转化为环烷烃,避免因加氢深度不够导致环烷基苯的生成,有利于提高低碳烯烃产率。A fixed fluidized bed reactor was used to study the effect of hydrocarbon components of catalytic cracking feedstock on the production of light olefins from the feedstock of HVGO-1,HVGO-2,HVGO-3,HVGO-3 light fraction and HVGO-3 heavy fraction.Compared with HVGO-1 with the similar density and hydrogen content,the higher cycloalkane content and lower aromatic content of HVGO-2 resulted in higher light olefins yield,and the same reaction rules were obtained for HVGO-3,HVGO-3 light fraction and HVGO-3 heavy fraction.Paraffins,naphthenes and monocyclic aromatics are the dominant components in the production of light olefins and gasoline.Among them,paraffins and naphthenes are the high value components in the production of light olefins,while alkylbenzenes are the high potential components in the production of gasoline and light aromatics(BTX).Under the same reaction conditions,the high content of cycloalkylbenzene in the HVGO-3 light fraction leads to the hydrogen transfer side reaction of light olefin precursors and light olefins,which affects the formation of light olefins.The hydrogenation pretreatment of FCC feedstock can improve the yield of light olefins by controlling the hydrogenation depth and realizing the conversion of polycyclic aromatic hydrocarbons to naphthenes,avoiding the formation of cycloalkylbenzene due to the lack of hydrogenation depth.

关 键 词：加氢减压蜡油 催化裂化 低碳烯烃 

分 类 号：TE624.41[石油与天然气工程—油气加工工程] TQ221.2[化学工程—有机化工]