Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group ib metal
Patent
1998-02-20
1999-11-30
Bos, Steven
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group ib metal
423 99, 423139, 423DIG14, C22B 1500, C22B 2300, C22B 1900
Patent
active
059937572
ABSTRACT:
A process for purifying a degraded oxime metal extractant organic phase from a metal extraction circuit wherein a degraded oxime metal extractant organic phase comprised of an oxime metal extractant, and aldehyde or ketone degradates in a water immiscible hydrocarbon solvent is reoximated thereby restoring the oxime extractant organic phase for further extraction in the metal extraction circuit. Optionally the degraded organic phase may be purified by distillation prior to reoximation. The distillation is carried out in a wiped film evaporator at temperatures above 180.degree. C. up to about 250.degree. C. at a pressure from about 0.5 mm Hg or lower up to about 10 mm Hg and the reoximation is carried out with hydroxylamine in the presence of a weak organic carboxylic acid as a phase transfer catalyst and in the presence of an alkali metal or alkaline earth metal hydroxide or carbonate, preferably sodium carbonate.
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Casey Mary
Krbechek Leroy
Virnig Michael J.
Bos Steven
Henkel Corporation
Jaeschke Wayne C.
Millson Jr. Henry E.
Szoke Ernest G.
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