高粘度减压馏分油NMP精制小试研究

Laboratory Trail Study on NMP Refining of High-Viscosity VGO

以某炼厂高粘度润滑油馏分油为原料,进行了NMP溶剂精制的小试研究。首先进行单级抽提试验,然后通过正交试验并借助数学手段,确定了NMP精制的适宜操作条件。在此基础之上,进行了NMP的假三段抽提试验及脱蜡试验。结果表明,无水抽提适宜操作条件为:抽提温度87℃,剂油体积比为0.75,在相同条件下,NMP单级抽提精制油收率为90.1%,60℃折光率为1.464 5;NMP假三段抽提精制油60℃折光率为1.462 2,油收率为90%。含水体积分数为1.5%的抽提适宜操作条件为:抽提温度88.5℃,剂油体积比1.38,在相同条件下,NMP单级抽提精制油收率为87.7%,60℃折光率为1.463 1;NMP假三段抽提精制油60℃折光率为1.461 0,油收率为87%。由折光率的变化可知假三段试验的精制效果优于单级抽提试验。

Single stage refining of high-viscosity lubricating oil using N-methyl-2-pyrrolidone（NMP） was carried out.The suitable operating conditions of the NMP refining were determined by orthogonal test and mathematical ways.On this basis,a simulate-three-stage extraction and dewaxing tests of NMP were done.The results show that the operation conditions of NMP anhydrous extraction are as follows： extracting temperature 87 ℃,the volume ratio of solvent to oil is 0.75.Under same conditions,NMP anhydrous single-stage extraction are as follows： the yield of refined oil is 90.1%,the refractive index is 1.464 5 at 60 ℃.NMP anhydrous simulate-three-stage extraction are as follows： the yield of refined oil is 90%,the refractive index is 1.462 2 at 60 ℃.Volume fraction of water 1.5% of extraction suitable operating conditions are as follows： extracting temperature 88.5 ℃,the volume ratio of solvent to oil is 1.38.Under same conditions,NMP single-stage extraction are as follows： the yield of refined oil is 87.7%,the refractive index is 1.463 1;NMP simulate-three-stage extraction are as follows： the yield of refined oil is 87%,the refractive index is 1.461 0 at 60 ℃.From refractive index changes to know that the effect of simulate-three-stage test is better than single-stage extraction test.