Production of aromatic carboxylic acids

C - Chemistry – Metallurgy – 07 – C

Patent

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Details

C07C 51/265 (2006.01) B01D 53/86 (2006.01) C07C 63/26 (2006.01) F23G 7/06 (2006.01)

Patent

CA 2273958

An effluent gas containing organic components including an aliphatic carboxylic acid and methyl bromide, gases includings nitrogen, oxygen, carbon monoxide and carbon dioxide, and water, particularly when derived from the production of an aromatic carboxylic acid such as terephthalic acid, is processed to eliminate substantially all of its aliphatic carboxylic acid content and is then subjected to high temperature combustion, optionally in the presence of an oxidation catalyst and/or a combustion assistant, to effect complete conversion of its methyl bromide content to HBr and/or Br2. The resulting gas stream is passed to an energy conversion device such as a gas turbine and is then scrubbed to remove HBr and/or Br2.

On traite un effluent gazeux contenant des constituants organiques dont un acide carboxylique aliphatique et du bromure de méthyle, des gaz dont l'azote, l'oxygène, le monoxyde et le dioxyde de carbone et de l'eau, en particulier quand ce gaz provient de la production d'un acide carboxylique aromatique tel que l'acide téréphtalique, dans le but d'éliminer sensiblement tout l'acide carboxylique aliphatique qu'il contient, et on lui fait subir ensuite une combustion à haute température, éventuellement en présence d'un catalyseur d'oxydation ou d'un auxiliaire de combustion, ou des deux, pour effectuer la conversion complète du bromure de méthyle qu'il contient en HBr ou Br¿2?, ou les deux. Le courant de gaz ainsi obtenu est transmis à un appareil de conversion d'énergie tel qu'une turbine à gaz, après quoi il est épuré pour éliminer le HBr ou le Br¿2?, ou les deux.

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