尾油循环条件下悬浮床加氢产物氮分布的研究  

Research on Nitrogen Distribution in Products of Slurry-Bed Hydrocracking of Cracked Residues Recycle

作　　者：文萍[1] 李传[1] 李庶峰[1] 邓文安[1] 

机构地区：[1]中国石油大学(华东)重质油加工国家重点实验室,山东青岛266555

出　　处：《石油化工高等学校学报》2012年第3期31-34,共4页Journal of Petrochemical Universities

基　　金：国家自然科学基金青年基金项目(21106186)

摘　　要：以克拉玛依炼油厂常压渣油为原料,在高压釜中进行悬浮床加氢反应。反应时间为1h,反应温度为440℃,催化剂质量分数为1 000μg/g,尾油循环量分别为0,15.0%,20.0%和25.0%,对反应后产物进行常减压蒸馏,切割馏分为IBP～180℃(汽油),180～360℃(柴油),360～500℃(蜡油)及大于500℃(尾油)。得到的各馏分用非水电位滴定法测定碱性氮含量,用化学发光定氮法测定总氮含量。研究表明:增大尾油循环量使进料中总氮和碱性氮增加,而增加的这部分碱性氮和总氮在反应过程中主要富集到尾油中。产物中的碱性氮和总氮主要集中在蜡油和尾油中,只有10%左右分布到汽油和柴油中,悬浮床加氢汽油和柴油中的碱性氮占馏分氮的质量分数较高,为50%～70%,蜡油、尾油中约为30%。Atmosphic residue of Karamay petrochemical complex was hydrocracked in the presence of 1 000 μg/g multrimetal dispersed cagalyst in slurry--bed under the reaction time of 1 h, reaction temperature of 440 ℃, the cracked residue was put back and mixed with the fresh feed for recycling. The ratios of cracked residue for recycling were 0, 15.0%, 20.0%, 25.0%. The reaction products was separate into IBP- 180℃ （Gasoline）, 180 - 360 ℃ （AGO）, 360 - 500 ℃ （VGO） and 〉 500℃ （Cracked residue）. The basic nitrogen in each fraction was determined by non--aqueous potentiometric titration. The nitrogen was determined by boat-- inlet using REN-- 1000A device. The basic nitrogen and total nitrogen in the product are mainly concentrated into VGO and cracked residue. Both basic nitrogen content and total nitrogen content increased with the increase of the ratio of cracked residue to feedstock. Only about 10% of the basic nitrogen and total nitrogen were in gasoline and AGO. The ratio of fraction basic nitrogen content to fraction total nitrogen content in VGO and cracked residue was about 30%, which was about 50%-70% in Gasoline and AGO.

关 键 词：渣油 悬浮床加氢 尾油循环 氮分布 

分 类 号：TE624.3[石油与天然气工程—油气加工工程]