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C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
C01B21/00—Nitrogen; Compounds thereof
C01B21/20—Nitrogen oxides; Oxyacids of nitrogen; Salts thereof
C01B21/38—Nitric acid
C01B21/44—Concentration
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FR455532D1912-03-121913-03-11Procédé pour la concentration de l'acide nitrique au moyen d'agents déshydratants, d'acide sulfurique par exemple
ExpiredFR455532A
(fr)
Procédé pour l'obtention d'acide nitrique et d'acide sulfurique concentrés au moyen de l'acide nitrosulfurique ou de l'acide sulfurique nitreux
Procédé et dispositifs pour la concentration continue des acides, l'extraction par distillation de l'acide nitrique de son mélange avec l'acide sulfurique, etc.