多产重石脑油加氢裂化催化剂再生前后生产分析

Production analysis of heavy naphtha maximizing hydrocracking catalyst before and after regeneration

在中国石油辽阳石化公司110万t/a减压蜡油加氢裂化装置中,以减压蜡油为原料,采用FF-46加氢精制催化剂和FC-46加氢裂化催化剂生产重石脑油,并且在装置运行657 d后,对2种催化剂进行了器外再生。结果表明:在原料油性质相似、进料量均为130 t/h的情况下,FF-46经再生后,精制反应器第1和第2床层入口温度较再生前分别降低了5.6,9.1℃,再生前后反应器出口物料含氮量均低于20μg/g。FC-46经再生后,裂化反应器第1~第3床层入口温度较再生前依次降低了14.9,12.9,11.0℃,转化率提高了1.6个百分点。催化剂再生后,轻重石脑油和轻重柴油总收率由再生前的84.89%提高到87.64%,液化气和尾油收率分别下降了0.98,2.01个百分点,产物组成分布更趋合理。随着运行时间的延长,再生后2种催化剂的工作状况良好,装置可稳定运行到下一个换剂周期。

Heavy naphtha was produced with vacuum gas oil as feedstock in a 1.1 Mt/a vacuum gas oil hydrocracking unit which adopted FF-46 hydrofining catalyst and FC-46 hydrocracking catalyst in Liaoyang Petrochemical Company,PetroChina.The two kinds of catalyst were regenerated by ex-situ regeneration method after running for 657 d.The results showed that comparing to what it was before regeneration,when the feed properties were similar and the feed rate 130 t/h,the inlet temperatures of the first and second beds of the refining reactor had decreased by 5.6,9.1℃respectively after the regeneration of FF-46,the nitrogen content of refined oil(outlet oil from refining reactor)was lower than 20μg/g.The inlet temperatures of the first to the third beds of cracking reactor had decreased by 14.9,12.9,11.0℃respectively and the conversion had increased by 1.6 percent points using FC-46 regeneration catalyst.After catalyst regeneration,the total yield of light and heavy naphtha,light and heavy diesel had increased from 84.89%to 87.64%,while that of liquefied gas and tail oil had decreased by 0.98,2.01 percentage points respectively.The operation conditions of the two regeneration catalysts were robust and the unit could run stably until the next catalyst replacement.