Method and catalyst for removing mercaptans and mercaptide compounds from aqueous alkaline solutions
AssigneeAshland Oil, Inc.
InventorsGilbert P. Anderson, Jr., Clifford Ward
Life of this patent
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Abstract
Disclosed is a catalyst and method for converting mercaptans and mercaptide compounds in aqueous alkaline solution to disulfides. Catalytic agent is metal compound of tetrapyridinoporphyrazine (TPPA) preferably impregnated on an inert granular support. Method comprises contacting mercaptans and mercaptide compounds in aqueous alkaline solution with air in the presence of the catalyst and subsequently separating alkaline solution from the resultant disulfide compounds.
Claims16
A catalyst for oxidizing alkali mercaptide compounds to disulfide in an aqueous alkaline solution comprising:
- a caustic-inert carrier having impregnated thereon a metal compound of tetrapyridinoporphyrazine or substituted derivatives thereof having the structural formula:
- ##SPC6##
- where M is a metal selected from the group consisting of iron, manganese, chromium, magnesium, copper, nickel, zinc, titanium, hafnium, thorium, tin, lead, columbium, tantalum, antimony, bismuth, molybdenum, palladium, platinum, silver, mercury, vanadium and cobalt, R is selected from the group consisting of hydrogen, methyl, ethyl, propyl, iso-butyl, phenyl, benzyl and napthyl groups, and X is a nitrogen atom, or a carbon atom having one R group attached thereto.
A catalyst for oxidizing alkali mercaptide compounds to disulfides in an aqueous solution, said catalyst comprising a caustic-inert carrier having impregnated thereon a metal-tetrapyridinoporphyrazine compound having the structural formula:
- ##SPC7##
- where M is a metal selected from the group consisting of cobalt and vanadium.
A method for preparing a catalyst for oxidizing alkali mercaptide compounds in aqueous alkaline solution to disulfide comprising:
- a. dissolving a metal compound selected from the group consisting of cobalt and vanadium tetrapyridinoporphyrazine compounds, and mixtures thereof, in a solvent;
- b. adding a granular adsorbent solid carrier to the solution resulting from (a) and saturating said solid carrier with said solution;
- c. separating said solid carrier from said solution and;
- d. washing said separated solid of (c) with a liquid selected from the group consisting of water, acetone, and mixtures thereof.
Dependencies are inferred from the claim text.