Abstract:

This paper is aimed at increasinge the yield of lubricating oil from waste lubricating oil and improving the product by co-solvent assisted furfural purification. The assisting co-solvent，normal butyl alcohol and its addition amount were determined. The effect of refining temperature and solvent to oil ratio on product yield was investigated and the properties of the product were determined. The results showed that near yellow clear lubricating oil could be produced with a yield of 88.5% under the conditions of mixed solvent（15% normal butyl alcohol∶furfural），temperature 85 ℃ and solvent to oil ratio 2∶1. The viscosity index was 128，colority was 1.5，refractive index was 1.4503，solidification point was －19 ℃，flash point was 218 ℃，carbon residue was 0.080%. Because of the high yield and improved quality，this process has good prospect of application.