Raschig hydroxylamine process
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The Raschig hydroxylamine synthesis is an industrial process for producing hydroxylamine. The hydroxylamine is generally used in the manufacture of caprolactam and hence nylon-6, although it also finds use in the semiconductor industry.
Process chemistry
The synthesis is a three step process. First, ammonia is oxidized in air to give nitrogen oxides (preferably dinitrogen trioxide), which react with ammonium carbonate to give ammonium nitrite:
- 2NH3 + 3O2 → N2O3 + 3H2O
- N2O3 + (NH4)2CO3 → 2NH4NO2 + CO2
The ammonium nitrite is reduced with sulfur dioxide in the presence of ammonia at 5 °C to give diammonium hydroxylaminedisulfonate:
- NH4NO2 + 2SO2 + NH3 → (NH4)2[HON(SO3)2]
The disulfonate is then hydrolyzed at 100 °C to give hydroxylamine sulfate:
- (NH4)2[HON(SO3)2] + H2O → NH2OH·H2SO4 + (NH4)2SO4
References
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