Process and composition for marine fuel

Abstract

A system and a method for producing a marine fuel are provided. An exemplary method includes processing a crude oil stream to remove at least a portion of metal contaminants to form a demetallized oil, processing the demetallized oil to remove at least a portion of sulfur contaminants to form a desulfurized oil, and stabilizing the desulfurized oil by removing light hydrocarbons to form the marine fuel.

What is claimed is: 
     
         1 . A method for producing a marine fuel, comprising:
 processing a crude oil stream to remove at least a portion of metal contaminants to form a demetallized oil;   processing the demetallized oil to remove at least a portion of sulfur contaminants to form a desulfurized oil; and   stabilizing the desulfurized oil by removing light hydrocarbons to form the marine fuel.   
     
     
         2 . The method of  claim 1 , comprising processing the crude oil stream in a hydrodemetallization reactor to form the demetallized oil. 
     
     
         3 . The method of  claim 1 , comprising processing the demetallized oil in a hydrodesulfurization reactor to form the desulfurized oil. 
     
     
         4 . The method of  claim 1 , comprising performing a partial distillation to separate the light hydrocarbons from the desulfurized oil to form the marine fuel. 
     
     
         5 . The method of  claim 4 , comprising adding a hydrocarbon blending stock to an effluent from a stabilization column to form the marine fuel. 
     
     
         6 . The method of  claim 1 , comprising reacting the crude oil stream with a supercritical water stream to remove the portion of the metal contaminants. 
     
     
         7 . The method of  claim 1 , comprising reacting the crude oil stream with a supercritical water stream to remove the portion of the sulfur contaminants. 
     
     
         8 . The method of  claim 1 , comprising reacting the crude oil stream with an alkali material to remove the portion of the metal contaminants. 
     
     
         9 . The method of  claim 1 , comprising reacting the crude oil stream with an alkali material to remove the portion of the sulfur contaminants. 
     
     
         10 . The method of  claim 1 , comprising reducing the sulfur contaminants in the desulfurized oil to form the marine fuel comprising less than about 0.5 wt. % sulfur. 
     
     
         11 . A system for producing a marine fuel from crude oil, comprising:
 a demetallization system;   a desulfurization system; and   a stabilization system to form the marine fuel.   
     
     
         12 . The system of  claim 11 , wherein the demetallization system comprises a hydrodemetallization reactor. 
     
     
         13 . The system of  claim 12 , comprising two hydrodemetallization reactors sequentially coupled. 
     
     
         14 . The system of  claim 13 , wherein the sequential coupling of the two hydrodemetallization reactors is reversible. 
     
     
         15 . The system of  claim 11 , wherein the desulfurization system comprises a hydrodesulfurization reactor. 
     
     
         16 . The system of  claim 15 , comprising two hydrodesulfurization reactors sequentially coupled. 
     
     
         17 . The system of  claim 16 , wherein the sequential coupling of the two hydrodesulfurization reactors is reversible. 
     
     
         18 . The system of  claim 11 , wherein the demetallization system, the desulfurization system, or both, comprises a supercritical water reactor. 
     
     
         19 . The system of  claim 11 , wherein the demetallization system, the desulfurization system, or both, comprises an alkaline metal reactor. 
     
     
         20 . The system of  claim 11 , wherein the stabilization system comprises a partial distillation tower. 
     
     
         21 . The system of  claim 11 , wherein the stabilization system comprises a full distillation tower. 
     
     
         22 . The system of  claim 11 , wherein the stabilization system comprises a flash vessel. 
     
     
         23 . The system of  claim 11 , where in the marine fuel comprises less than about 0.5 wt. % sulfur. 
     
     
         24 . The system of  claim 11 , wherein the demetallization system and the desulfurization system are combined into a single unit. 
     
     
         25 . The system of  claim 11 , comprising a secondary stripper coupled to a side draw from a stripper column. 
     
     
         26 . The system of  claim 25 , comprising a diesel stream from the secondary stripper.