Chemistry of inorganic compounds – Extracting – leaching – or dissolving
Patent
1996-06-04
1998-06-02
Langel, Wayne
Chemistry of inorganic compounds
Extracting, leaching, or dissolving
423 99, 423139, 568 14, B01D 1104, C07F 902
Patent
active
057595127
ABSTRACT:
The invention provides a method of regenerating dithiophosphorus extractants such as dithiophosphoric acids, dithiophosphonic acids and dithiophosphinic acids from their sulfur-sulfur bonded oxidation products contained in an organic solution. The process generates active hydrogen for regenerating the spent dithiophosphorus extractants. Advantageously, this active hydrogen originates either from introducing a reactive metal into a liquid mixture containing the organic solution and an acidic aqueous solution to form nascent hydrogen or from using hydrogen gas in the presence of a catalyst in the organic solution. The active hydrogen generated in the process breaks the sulfur-sulfur bonds of the dithiophosphorus molecules to form the corresponding dithiophosphorus acids.
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Krause Eberhard
Louie Pak Kuen
Love Bruce John
Mihaylov Indje Ognianov
Rickelton William Andrew
Biederman Blake T.
Cytec Technology Corp.
Inco Limited
Langel Wayne
Steen Edward A.
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