초록

Carbon content of vent and purge gases from hydrotreating is included as charge to synthesis gas generation with resulting efficiencies including decreased need for steam moderation and increased conversion of charge to desired product.

대표청구항 ▼

The method which comprises hydrotreating a heavy hydrocarbon charge having a 95% boiling point above about 975°F. in the presence of hydrotreating catalyst at 700°F.-850°F. and 2,000-3,500 psig hydrogen partial pressure thereby forming a product stream containing (i) hydrotreated hydrocarbon charact

The method which comprises hydrotreating a heavy hydrocarbon charge having a 95% boiling point above about 975°F. in the presence of hydrotreating catalyst at 700°F.-850°F. and 2,000-3,500 psig hydrogen partial pressure thereby forming a product stream containing (i) hydrotreated hydrocarbon characterized by a boiling point lower than that of said heavy hydrocarbon charge, (ii) hydrogen, (iii) ammonia and hydrogen sulfide, and (iv) lower hydrocarbons; separating from said product stream a separated gas stream containing hydrogen, ammonia, hydrogen sulfide and lower hydrocarbons; passing at least a portion of said separated gas stream as temperature moderator to a synthesis gas generation reaction zone wherein a hydrocarbon charge stream is gasified in the presence of a free-oxygen-containing gas and in the presence of said temperature moderator thereby forming increased quantities of product synthesis gas; and recovering said product synthesis gas. The method which comprises (i) hydrotreating a heavy hydrocarbon charge having a 95% boiling point above about 975°F. in the presence of hydrotreating catalyst at 700°F.-850°F. and 2,000-3,500 psig hydrogen partial pressure thereby forming a product stream containing hydrotreated hydrocarbon characterized by a boiling point lower than that of said heavy hydrocarbon charge and a separated gas stream including, hydrogen, ammonia and hydrogen sulfide, and lower hydrocarbons; (ii) mixing said hydrotreated hydrocarbon characterized by a boiling point lower than that of said heavy hydrocarbon charge and a recycle stream containing naphtha and soot thereby forming a hydrotreated hydrocarbon stream containing naphtha and soot; (iii) fractionating said hydrotreated hydrocarbon stream containing naphtha and soot thereby forming a bottoms slurry stream containing a heavy hydrocarbon fraction and soot; (iv) passing at least a portion of said bottoms slurry stream containing a heavy hydrocarbon fraction and soot as charge to a synthesis gas generation reaction zone wherein at 2,000°F.-3,000°F. and 100-2,500 psig, gasification is effected to yield product synthesis gas; (v) passing at least a portion of said separated gas stream as temperature moderator to the synthesis gas generation reaction zone thereby forming increased quantities of product synthesis gas; (vi) recovering said product synthesis gas.