Raschig hydroxylamine process
Revision as of 19:24, 3 July 2010 by Physchim62 (talk | contribs) (moved Raschig hydroxylamine synthesis to Raschig hydroxylamine process)
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:
- 2 NH3 + 3 O2 → N2O3 + 3 H2O
- N2O3 + (NH4)2CO3 → 2 NH4NO2 + CO2
The ammonium nitrite is reduced with sulfur dioxide in the presence of ammonia at 5 °C to give diammonium hydroxylaminedisulfonate:
- NH4NO2 + 2 SO2 + NH3 → (NH4)2[HON(SO3)2]
The disulfonate is then hydrolyzed at 100 °C to give hydroxylamine sulfate:
- 2 (NH4)2[HON(SO3)2] + 3 H2O → (NH3OH)2SO4 + 2 (NH4)2SO4
References
External links
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