Patent ID: 7914665

Claim:
A process to prepare lube basestocks from the lube oil boiling range feedstreams comprising: a) solvent dewaxing a lube oil boiling range feedstream in a solvent dewaxing stage operated under effective solvent dewaxing conditions thereby producing at least a partially dewaxed fraction, wherein the solvent dewaxing solvent is selected from the group consisting of methyl ethyl ketone, methyl isobutyl ketone, propane, ethane, and mixtures thereof; and b) contacting said partially dewaxed fraction with a hydrodewaxing catalyst in the presence of a hydrogen-containing treat gas in a reaction stage operated under effective mild hydrodewaxing conditions, thereby producing a reaction product comprising at least a gaseous product and liquid product, wherein said liquid product comprises a lube basestock, wherein the hydrodewaxing catalyst consists essentially of ZSM-48, wherein the effective mild hydrodewaxing conditions include temperatures of from 250° C. to 310° C., pressures of from 4,238 to 10,443 kPa (600 to 1,500 psig), liquid hourly space velocities of from 0.5 to 2 hr −1 , and hydrogen treat gas rates of 107 to 445 m 3 /m 3 (600 to 2,500 SCF H 2 /B) to convert trace paraffins remaining in said partially dewaxed fraction, and wherein the lube basestock has a VI within 0 to 2 points of the partially dewaxed fraction, a yield loss of 0 to 5 wt% based on the partially dewaxed fraction, a pour point within 0 to −3° C. of the partially dewaxed fraction, and a mini-rotary viscometry (MRV) value of at least 18% lower than the fully dewaxed fraction using only solvent dewaxing when blended into a finished lubricating oil, wherein said lube oil boiling range feedstreams are selected from raffinates, partially solvent dewaxed oils, deasphalted oils, distillates, vacuum gas oils, coker gas oils, foots oil, and dewaxed oils.