PROCESS FOR DEWAXING WAXY OILS PRODUCED BY HYDROTREATING

摘要

An improved process for dewaxing waxy oils which have been produced by hydrotrcating to produce a base oil suitable for the production of high-quality lubricating oil. The dewaxing process is carried out utilizing a solvent and a dewaxing aid. The dewaxing aids are alkyl acrylate polymers which improve the characteristics of the filtration stage of the dewaxing operation resulting in improved filtration rate and yield. The preferred alkyl acrylate polymers contain an alkyl group containing the number of carbon atoms "n" defined by the following equation 6.4 + 0.235t ? n ? 7.4 + 0. 235t.