废柴油机油絮凝抽提精制工艺

Flocculation-Extraction of Waste Diesel Engine Oil for Base Oil

采用絮凝抽提法对4S店回收的废柴油机油进行了再生利用研究。分别用异丙醇、丁酮两种单一溶剂,考察了精制温度、精制时间、剂油比(溶剂与废柴油机油的质量比)对精制油收率及性质的影响,得到最佳精制条件为:精制温度40℃,精制时间30 min,异丙醇的剂油比3,丁酮的剂油比5。在最佳精制条件下,异丙醇精制油的收率只有27.99%;而丁酮精制油的收率达到92.68%,但精制油的质量差。将异丙醇和丁酮混合作为复合溶剂,在精制温度40℃、精制时间30 min的条件下,考察了复合溶剂配比、剂油比等因素的影响。实验结果表明,复合溶剂的最优配比为m(丁酮)∶m(异丙醇)=3、最佳剂油比为3。复合溶剂精制油经白土补充处理后的油品符合HVI400基础油的标准,收率达65.77%。

Waste diesel engine oil was refined by flocculation-extraction with isopropanol and/ or butanone as solvents. The effects of extraction temperature, extraction time and the mass ratio of solvent to the waste oil on the yield and quality of the refined oil were researched. The experimental results showed that under the conditions of extraction temperature 40℃, extraction time 30 min, and the mass ratios of solvent to the waste diesel engine oil 3 for isopropanol and 5 for butanone, the refined oil yield were 27.99% and 92.68% respectively. But when butanone was used as the solvent, the quality of the refined oil was not good. A composite solvent is composed of isopropanol and butanone. Under the optimal conditions of the mass ratio of butanone to isopropanol 3, the mass ratio of the composite solvent to the waste oil 3, extraction time 30 min and extraction temperature 40℃, after the refined oil was treated with clay, its quality could meet the standard of HVI400 base oil and the yield reached 65.77%.