Catalyst for use in production of methacrylic acid and...

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B01J 27/24 (2006.01) C07C 51/235 (2006.01) C07C 57/055 (2006.01) C07B 61/00 (2006.01)

Patent

CA 2603005

[PROBLEMS] To provide a method for preparing, with ease and simplicity, a catalyst which can be used for producing methacrylic acid through the vapor phase catalytic oxidation of methacrolein or the like with a high yield and high selectivity, can maintain a stable yield of methacrylic acid over a long period of time and can respond to various reaction conditions. [MEANS FOR SOLVING PROBLEMS] A method for preparing a catalyst containing, as an active component, a salt formed by partially neutralizing a heteropoly acid having molybdenum, phosphorus, vanadium, cesium, antimony and ammonia as essential components, characterized in that a composite oxide containing the active components except antimony of the above essential active catalyst components is mixed with an antimony compound. The antimony compound may be added when a slurry is prepared.

Le problème à résoudre dans le cadre de l'invention est de fournir un procédé pour la préparation de manière aisée et simple, d~un catalyseur pouvant être utilisé pour la fabrication d'acide méthacrylique via l'oxydation catalytique en phase vapeur de méthacroléine ou similaire avec un rendement élevé et une grande sélectivité, pouvant maintenir un rendement stable et de longue durée d~acide méthacrylique et pouvant répondre à plusieurs conditions de réaction. La solution proposée consiste à fournir un procédé pour la préparation d~un catalyseur contenant, en tant que principe actif, un sel formé par la neutralisation partielle d~un acide hétéropoly contenant du molybdène, du phosphore, du vanadium, du césium, de l~antimoine et de l~ammonium en tant que composants essentiels, caractérisé en ce qu~un oxyde composite contenant les principes actifs hormis l~antimoine parmi les composants actifs essentiels du catalyseur est mélangé avec un composé d~antimoine. Le composé d~antimoine peut être ajouté lors de la préparation d~une bouillie.

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