Treating methanol-containing waste gas streams

Details Treating methanol-containing waste gas streams Treating methanol-containing waste gas streams

B - Operations, Transporting

01

D

B01D 53/86 (2006.01) B01J 37/02 (2006.01) C07C 45/38 (2006.01) D21C 11/06 (2006.01)

Patent

CA 2271723

A method wherein a methanol-containing waste gas stream, such as a pulp mill waste stream which contains methanol and other waste products, including methyl mercaptans, is passed in contact with a catalyst comprising certain supported metal oxides in the presence of an oxidizing agent; preferably the gas stream is contacted with the catalyst, in the presence of the oxidizing agent, for a time sufficient to convert at least a portion of the methanol to formaldehyde (CH2O).

Cette invention concerne un procédé de traitement d'effluents gazeux contenant du méthanol, tels que des effluents qui sont issus d'une usine de pâte à papier et qui contiennent du méthanol ainsi que d'autres déchets, y compris des mercaptans de méthyle. Ces effluents sont mis en contact rapide avec un catalyseur qui contient certains oxydes métalliques supportés, ceci en présence d'un agent oxydant. Les effluents gazeux sont de préférence mis en contact avec le catalyseur, en présence de l'agent oxydant, pendant une durée qui permet de transformer une partie au moins du méthanol en formaldéhyde (CH¿2?O).

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