Method for producing acrylic acid and methacrylic acid

C - Chemistry – Metallurgy – 07 – C

Patent

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C07C 51/43 (2006.01)

Patent

CA 2303445

The invention relates to a method for producing acrylic acid and methacrylic acid by producing a gaseous product mixture which essentially has the composition of a reaction mixture of the catalytic gas phase oxidation of C3- /C4- alkanes, -alkenes, -alkanols or -alkanals or precursors thereof to form acrylic acid or methacrylic acid. The product is separated from the gaseous product mixture according to a method comprising the following steps: a) condensing the gaseous product mixture; b) crystallising the acrylic acid or methacrylic acid from the solution obtained in (a); c) separating the resulting crystals from the mother liquor and d) returning at least a part of the mother liquor from stage (c) to stage (a).

L'invention concerne un procédé pour la préparation d'acide acrylique ou d'acide méthacrylique par préparation d'un mélange de produits gazeux présentant sensiblement la composition d'un mélange réactionnel de l'oxydation catalytique en phase gazeuse d'alcales C¿3?-/C¿4?, d'alcènes C¿3?-/C¿4?, d'alcanols C¿3?-/C¿4? ou bien d'alcanals ou encore de précurseurs de ceux-ci pour donner de l'acide acrylique ou de l'acide méthacrylique. La séparation du produit contenu dans le mélange de produits gazeux s'effectue selon un procédé comportant les étapes suivantes: a) condensation du mélange de produit gazeux, b) cristallisation de l'acide acrylique ou de l'acide méthacrylique contenu dans la solution obtenue lors de l'étape (a), (c) séparation des cristaux obtenus contenus dans la lessive-mère et (d) recyclage d'eau vers l'étape (a) d'au moins une partie de la lessive-mère issue de l'étape (c).

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