Exxon Research and Engineering Company

Other

Kent A Howard

William E Winter, Jr

Howard L Mitchell, Iii

Robert H Waghorne

John D Paynter

Duane A Goetsch

Karsten H Moritz

A heavy hydrocarbonaceous oil containing certain types of organic sulfur compounds, such as, dibenzothiophenes, is hydrorefined in two stages with interstage removal of hydrogen sulfide and ammonia. A nickel-containing hydrorefining catalyst is used in the first hydrorefining stage and a cobalt-containing hydrorefining catalyst is used in the second hydrorefining stage.

Two-stage hydrorefining process

Liquid salts such as quaternary phosphonium and ammonium salts of halides, acids, or more complex anions can be utilized to extract aromatics from mixed aliphatic/aromatic hydrocarbon feeds such as isomerization process feed streams, cat naphthas, lube stocks, and the like. Such salts show the required solubilities in various solvents to exhibit a distinct selectivity advantage over more commonly used extraction solvents such as sulfolane in the extraction of benzene and other aromatics from heptane and other aliphatic feedstreams.

Liquid salt extraction of aromatics from process feed streams

A sulfur-containing naphtha is separated into at least three fractions. Each fraction is desulfurized separately by a different desulfurization method. Subsequently, the desulfurized fractions are recombined. The intermediate boiling point naphtha fraction is desulfurized by an alkali metal desulfurization process, preferably in the presence of added hydrogen.

Process for desulfurizing and blending naphtha

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Kent A Howard