NMP 加助剂精制润滑油馏分结焦量的考察`

在润滑油NMP 加助剂精制过程中常出现结焦的现象。确定了测量结焦量的方法, 并分别对NMP +油、NMP +油+助剂、NMP+油+助剂+水3 种体系在0.101 、0 .003 6 及0.000 53 MPa 压力下的结焦量进行了考察。氧气对体系的结焦影响起决定性作用, 助剂对结焦有促进作用。氧气对不同体系结焦量影响的顺序从大到小是:剂+NMP+油、剂+NMP+油+水、NMP +油;水对体系的结焦有抑制作用。解决和防止NMP 精制结焦的关键是非临氧操作, 但实际操作中很难完全做到, 建议在临氧情况下通过筛选出适宜的助剂的方法, 以大幅度降低体系的结焦量。

Coking in the Process of VGO Refining With NMP Solvent Adding Assistant

The phenomenon of coking often appeared in the process of VGO refining with NMP solvent adding additive. The method of measuring coke content was founded, and the coke contents of three kinds of systems (NMP+ oil, additive + NMP + oil and additive + NMP + oil + water ) were measured respectively under 0.101, 0.003 6 and 0.000 53 MPa. There effect of oxygen on the coking of the systems is significant. The effect of oxygen on the coke content of the different systems gives the following subsequence(from great to little): additive + NMP + oil, additive + NMP + oil + water, NMP + oil. The water can resist the coking. The key factor to prevent coking is the operation without oxygen, but it is impossible to be controlled in practice. So the best method is to screen out the suitable additive in oxygen-bearing operation to decrease coke content.