hydroxylammonium sulfate

Hydroxylammonium sulfate can be obtained by the acid-base reaction of hydroxylamine with sulfuric acid:

Hydroxylammonium sulfate is used in the production of anti-skinning agents, pharmaceuticals, rubber, textiles, plastics and detergents.

Hydroxylammonium sulfate is also used to generate hydroxylamine-O-sulfonic acid from oleum or chlorosulfuric acid.

At 120 C, hydroxylammonium sulfate begins to decompose to sulfur trioxide, nitrous oxide, water, and ammonia:

Hydroxylammonium sulfate, (NHOH)SO, is the sulfuric acid salt of hydroxylamine.

The main step in this process, patented by Raschig in 1887, is the reduction of nitrite with bisulfite towards hydroxylamine di sulfonate, which is hydrolysed to hydroxylammonium sulfate.

The reaction is exothermic above 138 C, and is most exothermic at 177 C. Metals (especially copper, its alloys and its salts) catalyse the decomposition of hydroxylammonium sulfate.

Hydroxylammonium sulfate is used in organic synthesis to convert aldehydes and ketones to oximes, carboxylic acids and their derivatives (e.g. esters) to hydroxamic acids, isocyanates to N-hydroxyureas and nitriles to amidoximes.