Halcon Research and Development Corp.

Halcon International, Inc.

Richard A Johnson

A monovalent thallium compound is converted to a trivalent thallium compound by treating the thallium (I) compound with molecular oxygen in the presence of a Group VIII noble metal catalyst in a liquid medium and in the presence of a promoter comprising at least one member selected from the group consisting of alkyl ammonium salts, to oxidize the thallium (I) compound to a thallium (III) compound.

Process for catalytic conversion of thallium (I) to thallium (III)

Trivalent thallium values are extractively recovered from aqueous media containing dissolved trivalent and monovalent thallium values by treating the aqueous medium with an extractant comprising a carboxylic acid medium having limited solubility in water to preferentially extract at least a portion of the dissolved trivalent thallium values into the carboxylic acid extractant medium and recovering a carboxylic acid extract containing the extracted trivalent thallium values as a separate phase.

Extractive recovery of trivalent thallium values from aqueous solutions

A mono-valent thallium compound is converted to a trivalent thallium compound by treating the thallium (I) compound with molecular oxygen in the presence of a Group VIII noble metal catalyst and in the presence of a promoter comprising an alkali metal compound to oxidize the thallium (I) compound to a thallium (III) compound.

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Midland Park, NJ, United States of America

Richard A Johnson