Patent ID: 6858127

Claim:
A process for the preparation of one or more hydrocarbon fuel products boiling in the kero/diesel range from a stream of hydrocarbons produced in a Fischer Tropsch process comprising converting synthesis gas into liquid hydrocarbons, at least a part of the hydrocarbons boiling above the kero/diesel range, comprising the following steps: (1) hydrocracking/hydroisomerizing at least a part of the Fischer Tropsch hydrocarbons stream at a conversion per pass of at most 80 wt % of the material boiling above 370° C. into material boiling below 370° C.; (2) separating the product stream obtained in step (1) into one or more light fractions boiling below the kero/diesel boiling range, one or more fractions boiling in the kero/diesel boiling range and a heavy fraction boiling above the kero/diesel boiling range; (3) hydrocracking/hydroisomerizing a major part of the heavy fraction obtained in step (2) at a conversion per pass of at most 80 wt % of the material boiling above 370° C. into a product stream of material boiling below 370° C.; (4) separating the product stream obtained in step (3) into one or more light fractions boiling below the kero/diesel boiling range, one or more fractions boiling in the kero/diesel boiling range and a heavy fraction boiling above the kero/diesel boiling range; and, (5) hydrocracking/hydroisomerizing a major part of the heavy fraction obtained in step (4) in the hydrocracking/hydroisomerizing process described in step (1) and/or step (3), in which process the Fischer Tropsch hydrocarbons stream comprises at least 35 wt % C 30 + (based on total amount of hydrocarbons in the Fischer Tropsch hydrocarbons stream) and in which stream a weight ratio C 30 +/C 60 + is at least 0.2.