焦化粗苯两段加氢精制Ni-Mo/TiO_2-Al_2O_3和Co-Mo-P/TiO_2-Al_2O_3催化剂  

Ni-Mo/TiO_2-Al_2O_3 and Co-Mo-P/TiO_2-Al_2O_3 Catalysts for Hydrorefining of Coking Crude Benzol

作　　者：宿亮虎[1] 祝一锋[1] 江大好[1] 李小年[1] 

机构地区：[1]浙江工业大学绿色合成技术国家重点实验室培育基地,浙江杭州310032

出　　处：《石油化工》2010年第8期885-890,共6页Petrochemical Technology

基　　金：浙江省博士后科研项目择优资助(2009-BSH-002)

摘　　要：采用分步浸渍法制备了系列Ni-Mo/TiO_2-Al_2O_3和Co-Mo-P/TiO_2-Al_2O_3催化剂,在固定床微型反应装置上考察了n(Ni):n(Ni+Mo)、n(Co):n(Co+Mo)、P的添加量对催化剂预加氢和主加氢反应性能的影响;对粗苯两段加氢精制的工艺条件进行了研究。实验结果表明,2Ni-8Mo/TiO_2-Al_2O_3预加氢催化剂(NiO和MoO_3质量分数分别为2%和8%)和2Co-8Mo-1P/TiO_2-Al_2O_3主加氢催化剂(CoO,MoO_3,P_2O_5质量分数分别为2%,8%,1%)对粗苯加氢反应效果最好;粗苯两段加氢精制最优工艺条件为:预加氢反应温度190～230℃、主加氢反应温度310～360℃、反应压力2.0～3.5MPa、液态空速2.0～3.5h^(-1)、氢油体积比350～800,在此条件下加氢液体产物中噻吩硫含量为零,苯、甲苯和二甲苯总收率保持在99%以上;催化剂在160h的稳定性实验中表现出良好的稳定性。Ni-Mo/TiO2-Al2O3 and Co-Mo-P/TiO2-Al2O3 catalysts were prepared through a multi- step impregnation method. Effects of Ni（Co）/Mo mole ratio and phosphorus content on performances of these catalysts in two-stage hydrorefining of coking crude benzol were evaluated in a fixed-bed microreactor. Reaction conditions for the two-stage hydrorefining of coking crude benzol were investigated. 2Ni-8Mo/TiO2-Al2O3 and 2Co-8Mo-IP/TiO2-Al2O3 were found the two best catalysts for pre-hydrogenation and main hydrogenation of coking crude benzol respectively, in which mole ratio of Ni to （Ni ＋ Mo） and Co to （Co ＋ Mo） were 0. 325 and 0. 324, and mass fractions of NiO, CoO, MoO3 and P205 were 2%, 2%, 8% and 1%, respectively. Thiophenic sulfur content in the liquid products was zero and total recovery of benzene, toluene and xylene reached more than 99% under the optimized reaction conditions： pre-hydrogenation temperature 190 -230 ℃, main hydrogenation temperature 310 - 360℃, pressure 2.0 - 3.5 MPa, LHSV 2.0 - 3.5 h ^-1 and volume ratio of H2 to oil 350 -800. All the two catalysts exhibited good stability in a 160 h life test.

关 键 词：焦化粗苯 加氢精制 镍-钼催化剂 钴-钼催化剂 氧化钛-氧化铝复合载体 磷改性 

分 类 号：TQ522.62[化学工程—煤化学工程]