Patent ID: 7670476

Claim:
A process to optimize the yield of gas oils from a Fischer-Tropsch derived feed by performing the following steps (a) performing a hydroconversion/hydroisomerisation step on part of the Fischer-Tropsch derived feed, the feed comprising at least 20 wt % of the feed stream of compounds boiling above 360° C.; (b) performing a hydroconversion/hydroisomerisation step on another part of the Fischer-Tropsch feed, the feed comprising at least 20 wt % of the feed stream of compounds boiling above 360° C., at a conversion greater than the conversion in step (a); wherein the composition of the feeds to steps (a) and (b) is the same, and (c) isolating by means of distillation a gas oil fraction from the two reaction products obtained in steps (a) and (b), which is defined as the weight percentage of the feed boiling above 370° C. which reacts per pass to a fraction boiling below 370° C., is at least 20% while the difference in conversion is steps (a) and (b) is more than 5 wt. %.