Method for the recovery of palladium
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United States of America Patent
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Mar 25, 1986
Grant Date -
N/A
app pub date -
Jul 2, 1984
filing date -
Jul 2, 1984
priority date (Note) -
Expired
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Abstract
The present invention is directed to a method of separating and purifying palladium which is present in a solution with at least one other platinum group metal by adjusting the pH of the solution to from about 0 to 5, contacting the acidified solution with an ortho alkoxy substituted phenyl oxime of the formula: ##STR1## or a composition comprising of one or more of said compounds dissolved in an organic solvent, wherein: n is an integer of from 1 to 4; R.sub.1 is alkyl, cycloalkyl, or aralkyl; and R.sub.2 is nitro, halogen, hydrogen or substituted ro unsubstituted alkyl, alkoxy, aryloxy, cycloalkyl, aryl, aralkyl or alkaryl, wherein permissible substituents are those which are inert to process conditions; and R.sub.3 is alkyl, aryl, alkaryl, cycloalkyl or aralkyl either unsubstituted or substituted with one or more of the above referenced permissible substituents, using solvent extractions techniques, separating the aqueous phase from the organic phase containing substantially all of the palladium in association with the oxime compound, and stripping the palladium from the association with the oxime compounds in the organic phase by extraction with an aqueous ammonia solution.
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