Patent ID: 7674363
Filing Date: 2010-03-09
Classification: C10G,C10M,C10N

Abstract:
1. A process to prepare a haze free base oil having a cloud point below 0° C. and a kinematic viscosity at 100° C. greater than 10 cSt comprising the following steps: (a) hydroisomerizing a Fischer-Tropsch synthesis product, which has a weight ratio of compounds having at least 60 or more carbon atoms to compounds having at least 30 carbon atoms in the Fischer-Tropsch product of at least 0.2 and wherein at least 30 wt % of the compounds in the Fischer-Tropsch synthesis product have at least 30 carbon atoms; (b) isolating one or more fuel products and a distillation residue; (c) reducing the wax content of the residue by contacting the feed with a hydroisomerization catalyst under hydroisomerization conditions; and (d) solvent dewaxing the product of step (c) to obtain a haze free base oil.