Separation isotopique d'azote 15—III. influence du degre d'oxydation des gaz de reflux pour le systeme NO, NO2-HNO3
✍ Scribed by J. Nielsen; G. Guernier; M. Enjalbert
- Publisher
- Elsevier Science
- Year
- 1974
- Tongue
- English
- Weight
- 651 KB
- Volume
- 29
- Category
- Article
- ISSN
- 0009-2509
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✦ Synopsis
The authors present a spectrophotometer built to measure NO2 concentration in nitrogen oxides mixture. The coefficient of oxydation of these vapours, at fixed pressure and temperature, is quite linear with the NO, concentration in the gas.
In reduction of nitric acid with SO,, a constant coefficient of oxydation of nitrogen oxides has been obtained using the spectrophotometer as the controller in the regulation loop. The influence of this parameter on the isotopic separation of nitrogen 15 is described; reflux gases with a coefficient of oxydation of 25 per cent is recommended for the first stage of a separation process using a 57% weight nitric acid feed.