磷系高温缓蚀剂对环烷基减压馏分油加氢处理的影响

Effect of phosphorus- containing high temperature corrosion inhibitor on hydrotreating of naphthenic base vacuum gas oil

在中型加氢试验装置上,考察了磷系高温缓蚀剂对环烷基减压馏分油加氢处理的影响。结果表明,在系统压力（即氢分压）为3.0 MPa,反应温度为300℃,液时体积空速为1.0 h-1,氢油（氢气/原料油）体积比为400∶1的条件下,新鲜催化剂稳定运转1 900 h后活性稳定。在原料油中加入0.03%~0.20%的磷系高温缓蚀剂,加氢试验装置运行约1 000 h后,催化剂床层出现压降,且压降随运转时间的增加呈现先缓慢增加后快速上升的变化规律,床层压降最高达到1.4 MPa,顶部瓷球结焦、催化剂结块是导致加氢反应器产生压降的直接原因;在原料油中加入0.03%~0.20%的磷系高温缓蚀剂,精制油的酸值超标随运行时间的增加而增大;将反应温度逐渐提高至340℃,精制油的酸值、密度、折光率等性质均呈现先降低后迅速升高的变化规律;原料油中磷系高温缓蚀剂,降低了催化剂的活性以及环烷基减压馏分油的加氢处理深度。

The effect of phosphorus - containing high temperature corrosion inhibitor on hydrotreating of naphthenie base vacuum gas oil was investigated in a hydrogenation pilot unit. The results showed that under the conditions of system pressure （H2 pressure） 3.0 MPa, reaction temperature 300 ℃ , liquid hourly space velocity 1.0 h^-1, hydrogen to raw oil volume ratio 400：1 ,the new mode catalyst showed a stable trend after operating 1 900 h. When 0.03 % - 0. 20% phosphorus - containing high temperature corrosion inhibitor was added in raw oil and the hydrogenation unit had been operating for about 1 000 h, the pressure drop occurred, and with the extension of operation time, it increased slowly at first and then rose dramatically to the maximum1.4 MPa. The pressure drop formed in the hydrogenation reactor was attributed directly to the coking on the surface of Ceramic balls at the top of reactor and the agglomeration of catalyst, the overproof acid value of refined oil increased with extending operation time. When the reaction temperature was raised gradually to 340 ℃ , the acid value, density, refractive index and other properties all decreased first and then increased significantly. The phosphorus - containing high temperature corrosion inhibitor reduced the activity of catalyst, so that the hydrotrea- ting was lowered.