Fischer-tropsch jet fuel process

Abstract

The invention provides a Fischer-Tropsch jet fuel refining process which has a jet fuel yield in excess of 60% by mass, said process including at least four of the following five conversion processes: a. hydrocracking one or more of a FT kerosene and heavier material fraction and a C9 and heavier FT syncrude fraction; b. oligomerising an FT syncrude fraction including hydrocarbons in the range C2 to C8; c. hydrotreating one or more of an FT syncrude fraction, a product from process b., and an alkylated FT syncrude fraction; d. aromatizing one or more of an FT syncrude fraction including hydrocarbons in the range C2 to C8, a product from process a., a product from process b, a product from process c., and a product from an aromatic alkylation process; and e. alkylating one or more of an FT syncrude fraction including hydrocarbons in the C2 to C6 range, a product from process b., and a product from process d.

1 . A Fischer-Tropsch jet fuel refining process which has a jet fuel yield in excess of 60% by mass, said process including at least four of the following five conversion processes:
 a. hydrocracking one or more of a FT kerosene and heavier material fraction and a C9 and heavier FT syncrude fraction;   b. oligomerising an FT syncrude fraction including hydrocarbons in the range C2 to C8;   c. hydrotreating one or more of an FT syncrude fraction, a product from process b., and an alkylated FT syncrude fraction;   d. aromatizing one or more of an FT syncrude fraction including hydrocarbons in the range C2 to C8, a product from process a., a product from process b, a product from process c., and a product from an aromatic alkylation process; and   e. alkylating one or more of an FT syncrude fraction including hydrocarbons in the C2 to C6 range, a product from process b., and a product from process d.   
   
   
       2 . A process as claimed in  claim 1 , wherein the conversion processes b. and e. are combined when process b. is carried out using SPA catalyst. 
   
   
       3 . A process as claimed in  claim 1 , wherein processes d. and e. are combined. 
   
   
       4 . A process as claimed in any one of the preceding claims, wherein the oligomersation process b. is selected to oligomerise a C3 to C8 FT syncrude fraction to kerosene range hydrocarbons while maintaining and/or imparting cold flow properties. 
   
   
       5 . A process as claimed in any one of the preceding claims, wherein the hydrotreating process c. removes olefins and additionally removes oxygenates to produce kerosene. 
   
   
       6 . A process as claimed in any one of the preceding claims, wherein the aromatization process d. is selected to produce aromatics and not octane as such. 
   
   
       7 . A process as claimed in  claim 6 , wherein the aromatization process d converts Naphtha from hydrocracking process a. 
   
   
       8 . A process as claimed in  claim 6  or  claim 7 , wherein the aromatization process d. produces H 2 , Benzene, Toluene, Ethylbenzene, Xylene, and kerosene range aromatics. 
   
   
       9 . A process as claimed in  claim 8 , wherein the aromatization process d. avoids co-production of binuclear aromatics. 
   
   
       10 . A process as claimed in any one of the preceding claims, wherein the alkylation process e. increases multiple alkylation of aromatics with ethylene to produce aromatics in the kerosene boiling range, while reducing the ethylene in the product.