Patent ID: 6960291

Claim:
A naphtha desulfurization method, comprising: (a) contacting a sulfur-containing naphtha with hydrogen in the presence of a catalytically effective amount of a hydrotreating catalyst under catalytic hydrotreating conditions to form a hydrodesulfurized naphtha; (b) contacting the hydrodesulfurized naphtha with a first phase of a treatment composition containing water, alkali metal hydroxide, cobalt phthalocyanine sulfonate, and alkylphenols and having at least two phases, (i) the first phase containing dissolved alkali metal alkylphenylate, dissolved alkali metal hydroxide, water, and dissolved sulfonated cobalt phthalocyanine, and (ii) the second phase containing water and dissolved alkali metal hydroxide; (c) extracting mercaptan sulfur from the hydrodesulfurized naphtha to the first phase; and (d) separating an upgraded naphtha having less mercaptan sulfur than the hydrodesulfurized naphtha.