Recovery of acetic acid from dilute aqueous streams formed...

Details Recovery of acetic acid from dilute aqueous streams formed... Recovery of acetic acid from dilute aqueous streams formed...

C - Chemistry, Metallurgy

07

C

C07C 53/08 (2006.01) C07C 51/12 (2006.01) C07C 51/493 (2006.01) C07C 67/08 (2006.01)

Patent

CA 2217028

A method is provided to improve the quality of recycle of certain residues by modifying the separation of alkanes and alkane-like materials and carbonyl-containing impurities from the recycle during the manufacture of acetic acid by the carbonylation of methanol. The improvement comprises partitioning the residues by the addition of water obtained from aqueous streams containing up to 50 wt.% acetic acid and which have been treated in a catalytic distillation unit to react the acetic acid with methanol to form recyclable methyl acetate and water and wherein the water is separated from the organics by distillation.

L'invention décrit un procédé visant à améliorer la qualité du recyclage de certains résidus en modifiant la séparation des alcanes, matériaux du type alcane et impuretés contenant du carbonyle provenant du recyclage, au cours de la fabrication d'acide acétique par carbonylation de méthanol. L'amélioration apportée consiste à séparer les résidus par addition d'eau obtenue à partir de courants aqueux contenant jusqu'à 50 % en poids d'acide acétique et qui ont été traités dans une unité de distillation catalytique pour faire réagir l'acide acétique avec du méthanol afin d'obtenir un acétate de méthyle recyclable et de l'eau, l'eau étant séparée des substances organiques par distillation.

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