Preparation of hydroxylammonium salts

Details Preparation of hydroxylammonium salts Preparation of hydroxylammonium salts

C - Chemistry, Metallurgy

01

B

C01B 21/14 (2006.01) C01B 21/20 (2006.01)

Patent

CA 2141123

A process for the preparation of hydroxylammonium salts by catalytic reduction of nitrogen monoxide using hydrogen in the presence of a hydrogenation catalyst, comprises (a) in a first step, filtering the reaction mixture obtained after the reaction, giving a solution of essentially hydroxylammonium salt and a filter residue essentially comprising a mixture of hydrogenation catalyst and a solution of essentially hydroxylammonium salt, and (b) in a second step, subjecting the filter residue to a further separation process in order to concentrate the hydrogenation catalyst, giving a mixture having a higher concentration of hydrogenation catalyst than the filter residue and a mixture having a lower concentration of hydrogenation catalyst than the filter residue.

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