Process for Catalytic Conversion of Fischer-Tropsch Derived Olefins to Distillates

Abstract

The invention provides a low aromatic producing process for catalytical conversion of Fisher-Tropsch derived olefins to distillates (COD), which process includes the step of contacting Fisher-Tropsch derived olefins with a zeolyte type catalyst at pressures of more than 50 barg.

1 - 18 . (canceled) 
     
     
         19 . A process for catalytic conversion of Fisher-Tropsch derived olefins to distillates, comprising the steps of:
 contacting Fisher-Tropsch derived olefins with a zeolite type catalyst selected from the group consisting of a COD-9 catalyst and a ZSM-5 catalyst at a pressure of more than 50 barg and at a reactor temperature maintained below 280° C. to produce a COD product; and   hydrotreating the COD product to obtain a hydrotreated fraction.   
     
     
         20 . The process of  claim 19 , wherein the hydrotreating step comprises a first step of distillate hydrotreating the COD product followed by a second step of deep hydrotreating the COD product. 
     
     
         21 . The process of  claim 20 , wherein a hydrotreated fraction is collected during the distillate hydrotreating step before the COD product is subjected to the deep hydrotreating step. 
     
     
         22 . The process of  claim 19 , wherein the hydrotreating step comprises a one step deep hydrotreating of the COD product followed by collecting a hydrotreated fraction. 
     
     
         23 . The process of  claim 22 , wherein the one step deep hydrotreating step comprises hydrogenation over a high nickel content catalyst. 
     
     
         24 . The process of  claim 22 , wherein the one step deep hydrotreating step comprises hydrogenation over a noble metal catalyst. 
     
     
         25 . The process of  claim 24 , wherein the one step deep hydrotreating step comprises hydrogenation over a bimetallic catalyst. 
     
     
         26 . The process of  claim 19 , wherein the hydrotreating step is conducted at a hydrogenation reaction pressure of from 5000 kPa to about 8000 kPa, at a reaction temperature of from 200 deg C. to 260 deg C., and a liquid hourly space velocity of from 0.3 to 2. 
     
     
         27 . The process of  claim 20 , wherein the COD product is hydrogenated over a catalyst selected from the group consisting of a nickel-molybdenum or cobalt-molybdenum catalyst. 
     
     
         28 . The process of  claim 27 , wherein the COD product is hydrogenated at a reaction temperature range of from about 240 to below 350° C. at a pressure of from 5000 to 8000 kPa, at a hydrogen to hydrocarbon ratio maintained at about 400 nm 3 /hr, and at a liquid hourly space velocity of from 0.3 to 1. 
     
     
         29 . The process of  claim 19 , wherein a portion of the hydrotreated COD product is recycled to quench the hydrogenation reaction of the hydrotreating step. 
     
     
         30 . The process of  claim 19 , wherein a hydrotreatment catalyst bed of the hydrotreating step has multiple zones with increased grades. 
     
     
         31 . The process of  claim 19 , further comprising a step of blending the COD product or the hydrotreated fraction with a component selected from the group consisting of crude derived diesel, biodiesel, and alcohols.