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C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
C01B17/00—Sulfur; Compounds thereof
C01B17/69—Sulfur trioxide; Sulfuric acid
C01B17/74—Preparation
C01B17/76—Preparation by contact processes
C01B17/78—Preparation by contact processes characterised by the catalyst used
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FR493571D1916-10-191916-10-19Procédé pour la fabrication d'anhydride sulfurique et catalyseur servant à l'exécution de ce procédé
ExpiredFR493571A
(fr)