Recycling method for the preparation and processing of a hydroxyl ammonium salt solution
US4122153A · kind A · utility
3Cited by
1References
2Claims
0Family size
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Key dates
| Filing date | Dec 27, 1977 |
| Grant date | Oct 24, 1978 |
| Priority date | — |
| Expiry date | Dec 27, 1997 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B21/1418
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
An improved process is described for the reduction of ammonium ions, while avoiding any increase in nitrate ion concentration, in a liquid stream recycled between a zone of synthesis of hydroxyl ammonium salt and a zone for synthesis of oxime, wherein the liquid stream is contacted with a gas stream consisting essentially of nitrogen monoxide and containing nitrogen dioxide at a pressure above 1 atmosphere, at a temperature of at least 80.degree. C., such that after the contact the molar NO.sub.2 /NO ratio of the gas stream is within the range of between about 10.sup.-1 to 10.sup.-4 :1.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.