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US 4,515,757 AGranted
Stripping a solution containing molybdenum, tungsten and/or vanadium values
AssigneeChevron Research Company
InventorsGale L. Hubred, Dean A. Van Leirsburg
Life of this patent
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Abstract
A method of stripping an organic extraction solvent containing quaternary alkyl ammonium complexes. The extraction solvent is contacted with an aqueous stripping solution having at least 75 g/l bicarbonate ion, while maintained at between pH 7 and 9 at a temperature of no more than 50.degree. C.
Claims10
A method of stripping an organic extraction solvent containing
- (a) a metal quaternary alkyl ammonium complex selected from the group consisting of molybdenum, vanadium and tungsten quaternary alkyl ammonium complex or mixture of molybdenum, vanadium and tungsten quaternary alkyl ammonium complexes
- (b) a mixture of molybdenum and tungsten quaternary alkyl ammonium complexes,
- (c) a mixture of vanadium and tungsten quaternary alkyl ammonium complexes comprising:
- contacting said organic extraction solvent with an aqueous stripping solution maintained at a temperature of no more than 50.degree. C., a pH between 7 and 9, and containing at least 75 grams per liter of a salt of a bicarbonate ion, for a time sufficient to convert said metal quaternary alkyl ammonium complex or mixtures thereof to an aqueous soluble metal complex;
- and
- separating said organic extraction solvent and said aqueous stripping solution.
3 more elements
Dependencies are inferred from the claim text.