Removal of Fe.sup.(II) from hydroxylamine sulfate solution
 Purification of a concentrated aqueous solution of hydroxylamine sulfate (HAS) is carried out by contacting with an organic solution of 1-phenyl-3-methyl-4-trifluoroacetylpyrazol-5-one (HPMTFP) and trioctylphosphine oxide (TOPO). Divalent iron (Fe.sup.II) is removed to below about 3 wt. ppm making it possible to use the purified solution directly in the production of oxime compounds without further purification heretofore required. 
Allied-Signal Inc.
C
C01B
inventional
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