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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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FR39462D1930-12-061930-12-06Appareil à deux colonnes pour la concentration de l'acide nitrique et pour la dénitration d'acide sulfonitrique résiduaire
ExpiredFR39462E
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