沈北、大庆混合减四线脱蜡油NMP精制及选择性系数求取

NMP Refining of the Blended Oil of Shenbei and Daqing VGO-4 Oil and the Determination of Its Selectivity Coefficient

以沈北、大庆混合减四线脱蜡油为原料,进行NMP单级抽提试验,借助数学手段得到最优操作条件。NMP精制的最佳操作条件为:剂油比1.38(m/m),抽提温度60.8℃,含水量2.1%。在此操作条件下,精制油的收率为88.74%,60℃折光率为1.4776,黏度指数95.27。采用柱色谱法分析减四线脱蜡油族组成,测出所得四组分黏度指数,并确定理想组分与非理想组分。在此基础上,求得NMP溶剂精制在最优操作条件下的选择性系数为28.30。以相同的试验路线及方法,求得糠醛精制在最优操作条件下的选择性系数β值为20.04,表明NMP确实比糠醛有更好的选择性。

The NMP single-stage tests are proceed with the blended oil of Shenbei and Daqing VGO-4 oil as raw materials, the mathematical methods is used to obtain the best operating conditions. The best operating conditions of NMP refining are as follows： the ratio of solvent to oil is 1.38 （m/m）, the extraction temperature is 60.8 ~C and the moisture content is 2.1%. Under those operating conditions, the yield of refining oil is 88.74%, the RI at 60℃ is 1.4776 and the viscosity index is 95.27. The group compositions of VGO-4 are analyzed by silica gel column chromatography, the viscosity index of four components is determined and the ideal and non-ideal components are confirmed. Based on these, the selectivity coefficient （13） about NMP-solvent refining obtained under the best operating conditions is 28.30. Selectivity coefficient （13） about furfural-solvent refining under the best operating conditions is also acquired with the same experiment route and methods which is 20.04. It is proved that NMP has better selectivity than furfural.