Production of high quality diesel fuel and lubricant from high boiling aromatic carbonaceous material

Abstract

A broad embodiment of the present disclosure relates to a process for removal of at least 20%, 40% or 80% of the aromatics content of the fraction boiling above 190° C. from a heavy hydrocarbonaceous feedstock comprising at least 30 wt % aromatics, at least 3000 wt ppm nitrogen and at least 0.5 wt % oxygen said method being carried out in a single stage in which no intermediate stream is withdrawn and comprising the steps of a. providing a hydrotreater feed by combining said heavy hydrocarbonaceous feedstock with excess hydrogen, providing a hydrotreater feed, b. providing a hydrotreated hydrocarbon product comprising less than 30 wt ppm nitrogen, less than 20 wt ppm nitrogen or less than 10 wt ppm nitrogen by hydrotreating said hydrotreater feed by contacting it with a material catalytically active in hydrotreatment under hydrotreatment conditions, c. providing a hydrotreated product either as the hydrotreated hydrocarbon product of step b or by fractionation as a fraction of said hydrotreated hydrocarbon product, with the associated benefit of a process providing a low level of nitrogen in the hydrocarbon product also providing a high potential for dearomatization. The aromatics content of the heavy hydrocarbonaceous feedstock may typically be between 30 wt % aromatics and 90 wt % aromatics. The nitrogen content of the heavy hydrocarbonaceous feedstock may typically be between 3000 wt ppm and 10000 wt ppm. The oxygen content of the heavy hydrocarbonaceous feedstock may typically be between 0.5 wt % and 10 wt %. The removal of aromatics content from the fraction boiling above 190° C. may be from 20%, 40% or 80% to 99% or 100%.

1 . A process for removal of at least 20%, 40% or 80% of the aromatics content of the fraction boiling above 190° C. from a heavy hydrocarbonaceous feedstock comprising at least 30 wt % aromatics, at least 3000 wt ppm nitrogen and at least 0.5 wt % oxygen said method being carried out in a single stage in which no intermediate stream is withdrawn and comprising the steps of
 a. providing a hydrotreater feed by combining said heavy hydrocarbonaceous feedstock with excess hydrogen, 
 b. providing a hydrotreated hydrocarbon product comprising less than 30 wt ppm nitrogen, less than 20 wt ppm nitrogen or less than 10 wt ppm nitrogen by hydrotreating said hydrotreater feed by contacting it with a material catalytically active in hydrotreatment under hydrotreatment conditions, 
 c. providing a hydrotreated product either as the hydrotreated hydrocarbon product of step b or by fractionation as a fraction of said hydrotreated hydrocarbon product. 
 
     
     
         2 . A process according to  claim 1  in which the material catalytically active in hydrotreatment comprises a group VIII metal, a group VIB metal and an oxidic support, taken from the group consisting of alumina, silica, titania and combinations thereof. 
     
     
         3 . A process according to  claim 1 , in which the hydro-treatment conditions involve a hydrogen pressure from 120, 140 or 160 to 200 bar. 
     
     
         4 . A process according to  claim 1 , in which the hydro-treatment conditions involve a temperature from 340° C. or 360° C. to 400 or 420° C. 
     
     
         5 . A process according to  claim 1 , in which the hydro-treatment conditions involve a liquid hourly space velocity of 0.1 hr −1  or 0.2 hr −1  to 0.5 hr −1 , 0.6 hr −1  or 1.0 hr −1 . 
     
     
         6 . A process for production of a hydroprocessed product comprising the steps of  claim 1 , and the further steps of
 d. a further hydroprocessing step, directing said hydrotreated product or a fraction thereof to contact a further material catalytically active in hydroprocessing, under hydroprocessing conditions providing a hydroprocessed hydrocarbon and   e. providing a hydroprocessed product either as the hydroprocessed hydrocarbon product of step (d) or as a fraction of said hydroprocessed hydrocarbon product.   
     
     
         7 . A process according to  claim 6  in which the material catalytically active in hydroprocessing is a material catalytically active in hydrocracking such as a material comprising a metal component selected from Group VIII and/or VIB of the Periodic System and being supported on a carrier containing one or more oxides taken from the group consisting of alumina, silica, titania, silica-alumina, molecular sieves, zeolites, ZSM-11, ZSM-22, ZSM-23, ZSM-48, SAPO-5, SAPO-11, SAPO-31, SAPO-34, SAPO-41, MCM-41, zeolite Y, ZSM-5, and zeolite beta. 
     
     
         8 . A process according to  claim 7  in which the reaction step in the presence of a material catalytically active in hydrocracking is carried out at a temperature between 2000° C. and 400° C.,
 a pressure between 15 and 200 bar, 
 a liquid hourly space velocity between 0.2 hr−1 and 5 hr−1, 
 and a hydrogen to hydrocarbon ratio between 100 and 2000 Nm 3 /m 3 . 
 
     
     
         9 . A process according to  claim 1 , in which at least 80 wt % of either said hydrotreated product or said hydroprocessed product is a fraction boiling above 360° C. 
     
     
         10 . A process according to  claim 9  in which said hydroprocessed product fraction boiling above 360° C. is a lubricant or a lubricant base stock having a viscosity index of at least 110 or 120. 
     
     
         11 . A process according to  claim 1 , in which at least 80 wt % of either said hydrotreated product or said hydroprocessed product is a fraction boiling between 150 and 350° C. 
     
     
         12 . A process according to  claim 11  in which said fraction boiling between 150 and 350° C. is a diesel or a diesel blend stock having a cetane index of at least 35, 38 or 40.