Process for production of transportation fuel

Abstract

A process and a process plant for production of a hydrocarbon composition useful as a transportation fuel from a hydrocarbonaceous feedstock, including the steps of a. directing a hydrocarbonaceous feedstock to hydrotreatment in one or more steps providing an intermediate product including less than 0.1 wt % oxygen and a specific gravity, for the fraction boiling in the range defined by the commercial transportation fuel specification, above the upper limit of specific gravity under the commercial transportation fuel specification, b. providing a hydrotreated hydrocarbon stream for hydroconversion from the intermediate product, wherein a fraction for hydroconversion has a T50 being below T95 of the commercial transportation fuel specification, c. directing the stream for hydroconversion to contact a hydroconversion catalyst under hydroconversion conditions to provide a hydroconverted hydrocarbon stream, d. fractionating said hydroconverted hydrocarbon stream to provide at least said hydrocarbon composition useful as a transportation fuel.

1 . A process for production of a hydrocarbon composition useful as a transportation fuel according to a commercial transportation fuel specification from a hydrocarbonaceous feedstock comprising at least 0.5 wt % oxygen and at least 25 wt % carbon in cyclic structures, comprising the steps of
 a. directing a hydrocarbonaceous feedstock to hydrotreatment in one or more steps providing an intermediate product comprising less than 0.1 wt % oxygen and a specific gravity, for the fraction boiling in the range defined by the commercial transportation fuel specification, above the upper limit of specific gravity under the commercial transportation fuel specification,   b. providing a hydrotreated hydrocarbon stream for hydroconversion from said intermediate product optionally by fractionation, wherein said fraction for hydroconversion has a T50 being below T95 of the commercial transportation fuel specification,   C. directing the stream for hydroconversion to contact a hydroconversion catalyst under hydroconversion conditions to provide a hydroconverted hydrocarbon stream,   d. fractionating said hydroconverted hydrocarbon stream to provide at least said hydrocarbon composition useful as a transportation fuel.   
     
     
         2 . The process according to  claim 1 , wherein fractionating said hydroconverted hydrocarbon stream further provides at least a fraction boiling above T95 of the commercial transportation fuel specification, which is directed as recycle to be combined with said hydrotreated hydrocarbon stream for hydroconversion. 
     
     
         3 . The process according to  claim 1 , wherein the hydroconversion conditions involves a pressure above 15 MPa and below 25 MPa. 
     
     
         4 . The process according to  claim 1 , wherein the hydroconversion conditions involves a temperature above 350° C. and below 420° C. 
     
     
         5 . The process according to  claim 1 , wherein the hydroconversion catalyst comprises an active metal, either one or more elemental noble metals or one or more sulfided base metals, an acidic support. 
     
     
         6 . The process according to  claim 1 , wherein at least one step of hydrotreatment is carried outside a fixed bed reactor. 
     
     
         7 . The process according to  claim 1 , wherein at said commercial transportation fuel specification is a diesel specification. 
     
     
         8 . The process according to  claim 1 , wherein the provision of a hydrotreated hydrocarbon stream for hydroconversion from said intermediate product by fractionation involves separating said intermediate product into a fraction boiling in the naphtha range and a fraction boiling above the naphtha range. 
     
     
         9 . The process according to  claim 1 , wherein the hydrocarbonaceous feedstock originates from a thermochemical decomposition process. 
     
     
         10 . The process plant for production of a hydrocarbon by a process according to  claim 1 .