Process for the purification of acrylic acid

C - Chemistry – Metallurgy – 07 – C

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C07C 57/04 (2006.01) C07C 51/21 (2006.01) C07C 51/46 (2006.01)

Patent

CA 2086779

A process for producing acrylic acid is described, which process comprising providing a mixed gas of acrylic acid and by-products produced by catalytic gas phase oxidation of propylene and/or acrolein, contacting the mixed gas with water to obtain an aqueous solution, and adding an azeotrope solvent to the aqueous solution for distillation to obtain a mixture of the by-products, water and the azeotrope solvent from a tower top and acrylic acid from a tower bottom. Highly pure acrylic acid is obtained by using, as the azeotrope solvent, a mixed solvent of solvent A selected from diethyl ketone, methyl propyl ketone, methyl isobutyl ketone, methyl-tert-butyl ketone, n-propyl acetate and mixtures thereof and solvent B selected from toluene, heptane, methyl cyclohexane and mixtures thereof. 27

Méthode pour produire de l'acide acrylique, consistant à générer un mélange gazeux d'acide acrylique et de produits secondaires obtenus par oxydation catalytique en phase gazeuse de propylène et (ou) d'acroléine, à mettre en contact le mélange gazeux avec de l'eau pour former une solution aqueuse et à ajouter un solvant azéotrope à la solution aqueuse pour distillation, de façon à obtenir un mélange de produits secondaires, d'eau et de solvant azéotrope à partir du sommet d'une colonne, et de l'acide acrylique à partir du bas d'une colonne. On obtient un acide acrylique très pur en utilisant, comme solvant azéotrope, un solvant mixte composé d'un solvant A, choisi parmi une diéthylcétone, une méthylpropylcétone, une méthylisobutylcétone, une méthyl-tert-butylcétone, un acétate de n-propyle et leurs mélanges, et d'un solvant B choisi parmi le toluène, l'heptane, le méthylcyclohexane et leurs mélanges.

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