Method for preparing hydroxylamine

Details Method for preparing hydroxylamine Method for preparing hydroxylamine

2007-04-05

2008-08-26

Davis, Brian J (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Amino nitrogen containing

C564S301000

Reexamination Certificate

active

07417168

ABSTRACT:
A method for preparing hydroxylamine is provided that includes the steps of (i) pretreating an acidic buffer solution; and (ii) reducing nitrate ions in the acidic buffer solution with hydrogen to give hydroxylamine in the presence of catalysts, wherein the pretreatment is performed by adding a precipitant represented by formula (I) to the acidic buffer solution,in-line-formulae description="In-line Formulae" end="lead"?[(A)aM(CN)6.xH2O]  (I)in-line-formulae description="In-line Formulae" end="tail"?allowing the metal impurities in the acidic buffer solution to react with the precipitant to form metal complex, and then to remove the metal complex. The metal complex is formed and separated by pretreating the acidic buffer solution with a specific precipitant without adjusting pH and changing the composition of the acidic buffer solution prior to hydroxylamine synthesis, thus enhancing the selectivity of the hydroxylamine production.

REFERENCES:
patent: 3767758 (1973-10-01), Mars et al.
patent: 4062927 (1977-12-01), De Rooij et al.

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