Production of formaldehyde using carbon oxides, hydrogen and...

C - Chemistry – Metallurgy – 07 – C

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C07C 45/49 (2006.01) B01J 23/00 (2006.01) B01J 27/04 (2006.01) C07C 45/27 (2006.01) C07C 45/32 (2006.01) C07C 47/04 (2006.01) C07C 319/02 (2006.01)

Patent

CA 2316810

A method wherein a gas stream containing hydrogen, a carbon oxide and hydrogen sulfide is first passed in contact with a catalyst comprising a porous alumina supported sulfided metal selected from the group consisting of molybdenum (Mo), chromium (Cr), tungsten (W), manganese (Mn), nickel (Ni), iron (Fe), zinc (Zn), cobalt (Co), copper (Cu), tin (Sn), vanadium (Va) and mixtures thereof, optionally promoted by an alkali metal sulfide, to convert said hydrogen, carbon oxide and hydrogen sulfide to methyl mercaptans, (primarily methanethiol (CH3SH)), and the gas stream containing the methyl mercaptans are passed in contact with a catalyst comprising a supported metal oxide or a bulk metal oxide in the presence of an oxidizing agent and for a time sufficient to convert at least a portion of the methyl mercaptan to formaldehyde (CH2O), and sulfur dioxide (SO2).

Procédé selon lequel on met en contact un flux gazeux, constitué d'hydrogène, d'oxyde de carbone et d'hydrogène sulfuré, avec un catalyseur qui renferme un métal sulfuré ayant pour support de l'alumine poreuse et choisi dans le groupe comprenant le molybdène (Mo), le chrome (Cr), le tungstène (W), le manganèse (Mn), le nickel (Ni), le fer (Fe), le zinc (Zn), le cobalt (Co), le cuivre (Cu), l'étain (Sn), le vanadium (Va) et leurs mélanges, en association éventuellement avec un sulfure d'un métal alcalin, de façon à convertir lesdits hydrogène, oxyde de carbone et hydrogène sulfuré en méthylmercaptans (principalement le méthanethiol CH¿3?SH); puis on met le flux gazeux contenant les méthylmercaptans en contact avec un catalyseur qui renferme un oxyde métallique supporté ou un oxyde métallique brut, en présence d'un agent oxydant et pendant une durée suffisante pour convertir au moins une partie du méthylmercaptan en formaldéhyde (CH¿2?O) et anhydride sulfureux (SO¿2?).

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