Process for production of acetyl anhydrides and optionally...

C - Chemistry – Metallurgy – 07 – C

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C07C 51/15 (2006.01) C07C 53/00 (2006.01) C07C 303/00 (2006.01) C07C 309/00 (2006.01)

Patent

CA 2533264

Acetyl anhydrides such as acetyl sulfate are produced by a process for comprising contacting methane and carbon dioxide in an anhydrous environment in the presence of effective amounts of a transition metal catalyst and a reaction promoter, and an acid anhydride compound, and optionally an acid. The acetyl anhydride can be contacted with water to produce acetic acid or with an alcohol to produce a product comprising an acetate ester and that may also comprise acetic acid. Optionally, water in stoichiometric amounts or less, with respect to the acetic anhydride, may be fed to a continuous process of this type to produce some acetic acid in situ.

Selon l'invention, les anhydrides acétiques, tels que le sulfate d'acétyle, sont produits par un processus qui consiste à placer du méthane au contact d'un dioxyde de carbone dans un environnement anhydre, en présence de quantités efficaces d'un catalyseur de métaux de transition et d'un promoteur de réaction, d'un composé d'anhydride d'acide et éventuellement d'un acide. L'anhydride acétique peut être placé au contact de l'eau en vue de produire un acide acétique, ou au contact de l'alcool en vue d'obtenir un produit comprenant un ester d'acétate et, éventuellement, également un acide acétique. De l'eau peut être apportée éventuellement dans des quantités stoechiométriques ou inférieures, relativement à l'anhydride acétique, pour alimenter un processus continu de ce type afin de produire in situ un peu d'acide acétique.

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