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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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Vaporization, Distillation, Condensation, Sublimation, And Cold Traps
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Organic Low-Molecular-Weight Compounds And Preparation Thereof
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FR420803D1910-03-311910-09-26Procédé de concentration d'acide azotique faible à l'aide d'acide sulfurique ou d'autres agents absorbant l'eau
ExpiredFR420803A
(fr)
Procédé pour la production d'acide sulfurique et spécialement d'acide concentré ou d'oleum et de sulfate neutre à partir du bisulfate de soude
Procédé pour l'obtention d'acide nitrique et d'acide sulfurique concentrés au moyen de l'acide nitrosulfurique ou de l'acide sulfurique nitreux