Patent ID: 7354508
Filing Date: 2008-04-08
Classification: C10G,C10M,C10N

Abstract:
1. A process to prepare a heavy base oil having a kinematic viscosity at 100° C. of above 15 cSt and a light lubricating base oil having a kinematic viscosity at 100° C. of between 3.8 and 6 cSt from a partly isomerized Fischer-Tropsch derived feedstock, said feedstock having an initial boiling point of below 400° C. and a final boiling point of above 600° C. and the fraction boiling above 540° C. is at least 20 wt %, said process comprising: (a) separating, via distillation, said feedstock into a light base oil precursor fraction and a heavy base oil precursor fraction; (b) reducing the pour point of each separate base oil precursor fraction by means of dewaxing; and, (c) and isolating the desired base oil products from said dewaxed oil fractions as obtained in step (b).