System and method for making low volatile carbonaceous matter with supercritical co2

Abstract

A system for making low volatile carbonaceous material including a digestion vessel in communication with a carbonaceous material feedstock unit for producing a digested carbonaceous material; an extraction vessel in communication with the digestion vessel, the extraction vessel containing supercritical carbon dioxide fluid for extracting hydrocarbons from the digested carbonaceous material to produce an extract solvent and the low volatile carbonaceous material; and at least one separation vessel in communication with the extraction vessel for separating the extract solvent to a carbon dioxide gas and a stream of extracted hydrocarbons.

1 . A method for making low volatile carbonaceous material comprising:
 digesting contaminants in a carbonaceous material with an acid mixture solution to produce a digested carbonaceous material/acid mixture solution;   separating said digested carbonaceous material from said digested carbonaceous material/acid mixture solution;   contacting said digested carbonaceous material with a supercritical carbon dioxide fluid for extracting hydrocarbons from said digested carbonaceous material to produce an extract solvent and a low volatile carbonaceous material; and   separating said low volatile carbonaceous material from said extract solvent.   
     
     
         2 . The method for making low volatile carbonaceous material of  claim 1  further comprising:
 separating carbon dioxide gas from said extract solvent. 
 
     
     
         3 . The method for making low volatile carbonaceous material of  claim 1  further comprising:
 condensing said carbon dioxide gas to a carbon dioxide liquid. 
 
     
     
         4 . The method for making low volatile carbonaceous material of  claim 1  further comprising:
 heating said carbon dioxide liquid to produce a recycle stream of supercritical carbon dioxide fluid. 
 
     
     
         5 . A method for making carbon fiber comprising:
 digesting contaminants in a carbonaceous material with an acid mixture solution to produce a digested carbonaceous material/acid mixture solution;   separating said digested carbonaceous material from said digested carbonaceous material/acid mixture solution;   producing a carbon pitch from said digested carbonaceous material;   drawing ungraphitized carbon fiber from said carbon pitch to a desired diameter;   stabilizing said ungraphitized carbon fiber to produce a stabilized carbon fiber; and   graphitizing said stabilized carbon fiber to make said carbon fiber.   
     
     
         6 . The method for making carbon fiber of  claim 5  wherein said stabilizing ungraphitized carbon fiber comprises:
 transporting said ungraphitized carbon fiber on a plurality of heated rollers through a heater at a temperature of from about 200° C. to about 300° C. 
 
     
     
         7 . The method for making carbon fiber of  claim 5  wherein said graphitizing said stabilized carbon fiber comprises:
 transporting said stabilized carbon fiber through a heater in the absence of oxygen at a temperature of from about 1,850° C. to about 5,500° C. 
 
     
     
         8 . The method for making carbon fiber of  claim 5  further comprising:
 oxidizing the outer surface of said carbon fiber by contacting said carbon fiber with an oxidizing agent. 
 
     
     
         9 . The method for making carbon fiber of  claim 5  further comprising:
 coating said carbon fiber with an adhesive for to improve subsequent bundling of said carbon fiber.