Process for conversion of a deasphalted oil

Abstract

The invention relates to a process for conversion of a heavy feedstock that has a boiling point of more than 340° C. for at least 80% by weight of the feedstock, a Conradson carbon content of at least 5% by weight, an asphaltene content of at least 1% by weight, a sulfur content of at least 0.5% by weight, and a metal content of at least 20 ppm, process in which: Said feedstock is subjected to deasphalting, and a deasphalted oil that contains less than 1% by weight of asphaltenes is obtained At least a portion of said oil, and preferably all of it, is subjected directly to hydroconversion in the presence of a supported or dispersed catalyst, and the effluent that is obtained is distilled to separate a residue At least part if not all of said residue is recycled with the feedstock to deasphalting.

1 . A process for conversion of a heavy feedstock that has a boiling point of more than 340° C. for at least 80% by weight of the feedstock, a Conradson carbon content of at least 5% by weight, an asphaltene content of at least 1% by weight, a sulfur content of at least 0.5% by weight, and a metal content of at least 20 ppm, said process comprising: 
 subjecting said feedstock to deasphalting, to obtain a deasphalted oil that contains less than 1% by weight of asphaltenes    subjecting at least a portion of said deasphalted oil directly to hydroconversion in the presence of a supported or dispersed catalyst, and distilling the resultant effluent to separate a residue, and    recycling at least part of said residue with the feedstock to said deasphalting.    
     
     
         2 . A process according to  claim 1 , wherein all of the deasphalted oil is subjected to hydroconversion.  
     
     
         3 . A process according to  claim 1 , wherein the feedstock has a boiling point of more than 540° C. for at least 80% by weight of the feedstock and a viscosity that is lower than 100,000 cSt at 100° C.  
     
     
         4 . A process according to  claim 1 , wherein the hydroconversion stage is conducted in a boiling bed with a conversion per pass of at least 60% by weight.  
     
     
         5 . A process according to  claim 1 , wherein the hydroconversion stage is conducted in a fixed bed with a conversion of greater than or equal to 20% by weight and less than 50% by weight.  
     
     
         6 . A process according to  claim 1 , wherein the hydroconversion stage is conducted in a moving bed with a conversion of greater than or equal to 20% by weight and less than 50% by weight.  
     
     
         7 . A process according to  claim 1 , wherein the hydroconversion stage is conducted as a slurry with a conversion of at least 50% by weight.  
     
     
         8 . A process according to  claim 7 , wherein the hydroconversion stage is conducted at a temperature of 400-470° C. and with a conversion of at least 80% by weight.  
     
     
         9 . A process according to  claim 1 , wherein said feedstock is directly subjected to deasphalting.  
     
     
         10 . A process according to  claim 1 , wherein all of the residue is fed to the deasphalting.  
     
     
         11 . A process according to  claim 2 , wherein all of the residue is fed to the deasphalting.  
     
     
         12 . A process according to  claim 11 , wherein said feedstock is directly subjected to deasphalting.