Process for preparing monomers and polymers thereof

Details Process for preparing monomers and polymers thereof Process for preparing monomers and polymers thereof

C - Chemistry, Metallurgy

12

P

C12P 13/02 (2006.01) C07C 57/04 (2006.01) C07C 233/05 (2006.01) C12P 7/40 (2006.01) C12P 7/62 (2006.01)

Patent

CA 2573627

A process of preparing an ethylenically unsaturated amide or an ethylenically unsaturated carboxylic acid or salt thereof from the corresponding ethylenically unsaturated nitrile wherein the nitrile is subjected to a hydration or hydrolysis reaction in an aqueous medium in the presence of a biocatalyst, wherein the nitrite contains above 2 ppm acrolein and the amide or carboxylic acid or salt thereof contains less than 2 ppm acrolein. The process can be used to prepare high purity acrylamide or acrylic acid (salt) from low quality acrylonitrile containing high levels of acrolein. Suitable biocatalysts include microorganisms of the Rhodococcus genus.

L'invention concerne un procédé de préparation d'un amide éthyléniquement insaturé ou d'un acide carboxylique éthyléniquement insaturé ou d'un sel de ce dernier à partir du nitrile éthyléniquement insaturé correspondant, le nitrile étant soumis à une réaction d'hydratation ou d'hydrolyse dans un milieu aqueux en présence d'un biocatalyseur, le nitrite contenant plus de 2 ppm d'acroléine et l'amide ou l'acide carboxylique ou leur sel contenant moins de 2 ppm d'acroléine. Le procédé peut être utilisé pour préparer de l'acrylamide ou de l'acide acrylique (sel) de haute pureté à partir d'acrylonitrile de faible qualité contenant des niveaux élevés d'acroléine. Parmi les biocatalyseurs appropriés, on trouve les micro-organismes du genre Rhodococcus.

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