Hydrocarbon Fluids

Abstract

Provided herein is a method for producing a hydrocarbon fluid from waste plastic feedstock, comprising (a) providing a first hydrocarbon feed stream, wherein at least 50 wt % off said first hydrocarbon feed stream is obtained from pyrolysis of plastic waste; (b) removing contaminants from said first hydrocarbon feed stream using a washing step with a polar solvent and/or contacting the stream with one or more adsorbents; thereby obtaining a first hydrocarbon fluid; and (c) hydrogenation of olefins and diolefins in said first hydrocarbon fluid; thereby obtaining a hydroprocessed hydrocarbon fluid containing less than 0.1 wt % olefins; a total amount of Nmetals selected from mercury, lead, and iron below 5 wppm; less than 5 wppm of chlorine and fluorine; and less than 5 wppm of sulfur.

1 . A method for producing a hydrocarbon fluid from waste plastic feedstock, comprising:
 a) providing a first hydrocarbon feed stream, wherein at least 50 wt % of said first hydrocarbon feed stream is obtained from the pyrolysis of plastic waste;   b) removing contaminants from said first hydrocarbon feed stream by:
 subjecting at least a portion of said first hydrocarbon feed stream to a washing step with a polar solvent; and/or 
 contacting at least a portion of said first hydrocarbon feed stream with one or more adsorbents suitable for removing one or more contaminants selected from water, metals, chlorides, nitrogen-containing compounds, oxygenates, and phosphorous-containing compounds; 
   thereby obtaining a first hydrocarbon fluid;   c) hydrogenation, in one or more hydroprocessing steps, of olefins and diolefins in said first hydrocarbon fluid, optionally blended with a second hydrocarbon feed stream;   thereby obtaining a hydroprocessed hydrocarbon fluid containing:
 less than 0.1 wt % olefins; 
 a total amount of metals selected from mercury, lead, and iron below 5 wppm; 
 less than 5 wppm of chlorine and fluorine; and 
 less than 5 wppm of sulfur. 
   
     
     
         2 . The method of  claim 1 , wherein at least 80 wt % of said first hydrocarbon feed stream is obtained from the pyrolysis of plastic waste. 
     
     
         3 . The method of  claim 1 , wherein said first hydrocarbon feed stream comprises at least 30% of hydrocarbons having a boiling point ranging from 100° C. to 350° C. 
     
     
         4 . The method of  claim 1 , wherein said hydrogenation of olefins and diolefins is done via
 c1) selective hydrogenation of diolefins in said first hydrocarbon fluid or a fraction thereof, thereby obtaining a second hydrocarbon fluid; and   c2) subjecting said second hydrocarbon fluid or a part thereof, optionally blended with a second hydrocarbon feed stream, to one or more hydroprocessing steps.   
     
     
         5 . The method of  claim 1 , wherein said hydroprocessed hydrocarbon fluid has a T10 distillation point of at least 100° C., and a T90 distillation point of at most 350° C. 
     
     
         6 . The method of  claim 1 , wherein said first hydrocarbon fluid is blended with 5 wt % to 95 wt % of a second hydrocarbon feed stream. 
     
     
         7 . The method of  claim 1 , wherein at least one of said one or more hydroprocessing steps is performed under conditions allowing for the saturation of aromatics, and wherein the hydroprocessed hydrocarbon fluid contains less than 0.5 wt % of aromatics. 
     
     
         8 . The method of  claim 1 , wherein the hydroprocessed hydrocarbon fluid contains:
 less than 0.001 wt % olefins;   less than 1 wppm of selected from mercury, lead, and iron;   less than 1 wppm of chlorine and fluorine; and   less than 5 wppm of sulfur.   
     
     
         9 . The method of  claim 1 , wherein said one or more adsorbents comprise one or more adsorbents selected from the group consisting of molecular sieves, silica gel, activated carbon, and alumina. 
     
     
         10 . The method of  claim 1 , wherein the removal of said contaminants is done by a combination of said washing step and said contacting of at least a portion of the first hydrocarbon feed stream with one or more adsorbents. 
     
     
         11 . The method of  claim 1 , wherein the hydrogenation is preceded by a gas stripping step to reduce the O 2  content in said purified hydrocarbon fluid. 
     
     
         12 . The method of  claim 1 , further comprising fractionation of said hydroprocessed hydrocarbon fluid, thereby obtaining two or more fractions having a different boiling range. 
     
     
         13 . The method of  claim 1 , wherein said first hydrocarbon feed stream comprises at least 10 wt % of olefins, preferably at least 20 wt % of olefins. 
     
     
         14 . The method of  claim 1 , wherein said first hydrocarbon feed stream comprises at least 1 wt % of diolefins. 
     
     
         15 . The method of  claim 1 , further comprising a hydro-isomerization step.