| 摘要 |
PURPOSE:To obtain in a good yield a high-quality naphthene base oil suitable for refrigerator oil, etc. by hydrotreating a naphthenic lubricating oil stock in the presence of a catalyst consisting of Mo and Ni and/or Co supported on alumina under specified conditions after solvent extraction. CONSTITUTION:A vacuum gas oil obtd. from a naphthenic crude oil by vacuum distillation is subjected to solvent extraction with a solvent such as furfural to adjust arom. carbon content in %(CA) according to ring analysis to 10-16. Then the purpose high-quality naphthene base oil is obtd. by hydrotreating the obtd. oil in the presence of a catalyst consisting of Mo and Ni and/or Co supported on alumina at liquid hourly space velocity of 0.1-0.7hr<-1>, a pressure of 40-100kg/cm<2>, a temp. of 270-350 deg.C and a hydrogen/oil ratio of 70- 200Nm<2>/kl. If necessary, it is possible to obtain a higher-quality naphthene base oil by adsorption with active clay, etc. |
