Process for the preparation of middle distillates

Details Process for the preparation of middle distillates Process for the preparation of middle distillates

2005-02-22

2005-02-22

Parsa, J. (Department: 1621)

Mineral oils: processes and products

Chemical conversion of hydrocarbons

Plural serial stages of chemical conversion

C208S058000, C208S107000, C208S108000, C208S133000, C518S700000, C518S715000

Reexamination Certificate

active

06858127

ABSTRACT:
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, in which process synthesis gas is converted into liquid hydrocarbons, at least a part of the hydrocarbons boiling above the kero/diesel range, having 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 the 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 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 the 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 % C30+ (based on total amount of hydrocarbons in the Fischer-Tropsch hydrocarbons stream) and in which stream the weight ratio C60+/C30+ is at least 0.2.

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International Search Report dated Apr. 11, 2003.

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