PROCESS TO PREPARE MIDDLE DISTILLATES AND BASE OILS

摘要

A process to prepare a first middle distillates fraction, a second middle distillates fraction and one or more base oils, the process comprising the steps of providing a Fischer-Tropsch product stream; separating the Fischer-Tropsch product stream to obtain at least a low boiling fraction, boiling below a temperature in the range of from 300 to 450° C., and a high boiling fraction, boiling above a temperature in the range of from 300 to 450° C.; subjecting the high boiling fraction to a hydrocracking/hydroisomerization step to obtain an at least partially isomerised product stream; separating the partially isomerised product stream to obtain a first middle distillates fraction and a residual fraction, wherein the residual fraction has a T10 wt. % boiling point of between 200 and 450° C.; dewaxing the low boiling fraction to obtain a second middle distillates fraction; and dewaxing the residual fraction to obtain one or more base oils.