工艺条件对柴油吸附分离重芳烃轻质化反应的影响  

Effects of process condition on performance of diesel aromatic to light aromatic

作　　者：刘凯隆 朱孔义 郭春垒 马晓彪 王宇健 盛强 李翔 王银斌 靳凤英 LIU Kailong;ZHU Kongyi;GUO Chunlei;MA Xiaobiao;WANG Yujian;SHENG Qiang;LI Xiang;WANG Yinbin;JIN Fengying(CenerTech Tianjin Chemical Research and Design Institute Co.,Ltd.,Tianjin 300131,China;College of Chemical Engineering and Materials Science,Tianjin University of Science and Technology,Tianjin 300457,China;Inner Mongolia YiTai Petrochemical Institute Limited Co.,Ltd.,Ordos 017000,China)

机构地区：[1]中海油天津化工研究设计院有限公司,天津300131 [2]天津科技大学化工与材料学院,天津300457 [3]内蒙古伊泰石油化工有限公司,内蒙古鄂尔多斯017000

出　　处：《无机盐工业》2024年第6期139-146,共8页Inorganic Chemicals Industry

基　　金：国家重点研究计划项目(E-J723TH05);中海油能源发展重大科技专项课题(HFZXKT-TJY2020-01)。

摘　　要：馏分油芳烃吸附分离技术是炼厂过剩汽、煤、柴油资源高效利用的途径。分离得到的非芳烃组分可通过蒸汽裂解或催化裂解增产低碳烯烃,以单环芳烃为主的芳烃组分则可通过重芳烃轻质化技术增产苯、甲苯和二甲苯等轻质芳烃,同时副产优质乙烯裂解原料。以吸附分离重芳烃组分为原料,测定了氢气溶解量。吸附分离重芳烃油中氢气的溶解量随温度和氢压的增加而增加,达到1.0×10^(-4)~3.2×10^(-4) mol/g,比油中多环芳烃加氢成单环芳烃所需理论耗氢量低1~2个数量级。进一步采用NiMo/β轻质化催化剂在固定床反应器上考察了催化剂还原条件、反应器高径比、反应温度、氢分压、氢油比、空速等工艺参数对吸附分离重芳烃轻质化反应的影响。在低温高压(350℃、4 MPa)的还原工况下,反应器高径比为4.5、反应温度为400~410℃、氢分压为5.0~5.5 MPa、氢油体积比为800~1 000、质量空速为1~1.5 h^(-1)的条件下,吸附分离重芳烃轻质化效果最佳,C^(+)_(10)转化率≥85%,C_(6)~C_(9)芳烃收率≥50%,C_(6)~C_(9)芳烃纯度≥97.5%。柴油芳烃吸附分离和重芳烃轻质化可实现高效耦合,显著提高化工品收率,具有重大的现实意义和广阔的应用前景。The adsorptive separation of heavy aromatics from fuel fractions yields is an efficient way to utilize surplus gasoline and diesel resources in refineries.The non-aromatic products can be used to increase the production of low-carbon olefins through steam cracking or catalytic cracking processes.The aromatic products are mainly composed of mono-aromatics,which can be turned into good feedstocks for ethylene production and light aromatics like benzene,toluene,and xylene through the heavy aromatic lightening technology.The hydrogen solubility was measured using adsorption separation of heavy aromatic hydrocarbon components as raw materials.The solubility of H_(2) in the heavy aromatics was between 1.0×10^(-4)~3.2×10^(-4) mol/g,and increased with temperature and H_(2) pressure.It was 1~2 order of magnitude lower than that needed for the hydrogenation of ploy-aromatics to mono-aromatics.The effects of the reduction temperature of catalyst precursor,the aspect ratio of fixed-bed reactor,the reaction temperature,the H_(2) partial pressure,the H_2-oil ratio,and the weight hourly space velocity(WHSV) on the lightening of heavy aromatics obtained by adsorptive separation from a diesel fractions over a NiMo/β catalyst were also studied.Over the catalyst prepared by reduction of the precursor under relatively low temperature and high pressure(350℃and 4 MPa),the optimal reaction conditions were aspect ratio of 4.5,reaction temperature of 400~410℃,H_(2) pressure of 5.0~5.5 MPa,H_2-oil ratio of 800~1000,and WHSV of 1~1.5 h^(-1).Under the conditions,the conversion of the C~+_(10) compounds was above 85%,while the yield and the purity of C_6~C_(9) aromatics were more than 50%and97.5%,respectively.The coupling of diesel adsorptive separation and the lightening of the obtained heavy aromatics to light aromatics greatly improved the yields of chemicals from diesel fractions,which made broad application prospect and enormous practical significance.

关 键 词：吸附分离芳烃 柴油芳烃 重芳烃轻质化 芳烃收率 溶氢 

分 类 号：TQ127.2[化学工程—无机化工]