A process for separation of the dipotassium salt of...

C - Chemistry – Metallurgy – 07 – C

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C07C 51/41 (2006.01) B01J 27/232 (2006.01) C07C 51/02 (2006.01) C07C 51/15 (2006.01) C07C 51/265 (2006.01) C07C 51/42 (2006.01) C07C 51/43 (2006.01) C07C 51/47 (2006.01) C07C 51/487 (2006.01) C07C 63/14 (2006.01) C07C 63/337 (2006.01) C07C 63/38 (2006.01) C08G 63/189 (2006.01)

Patent

CA 2383507

In a process for producing aromatic dicarboxylic acids which incorporates the disproportionation of a salt of an aromatic mono- or dicarboxylic acid to produce the unreacted salt of an aromatic mono- or dicarboxylic acid and the salt of the desired aromatic dicarboxylic acid, a method is disclosed for separating the salt of the desired product from the unreacted salt which comprises passing both said unreacted salt and said salt of the desired product in an aqueous solution over an adsorbent comprising an activated carbon. The process is particularly suitable for separating potassium naphthoate from 2,6-K2NDA after potassium naphthoate is disproportionated to produce 2,6-K2NDA and 1- or 2- potassium naphthoate. The adsorbent can be regenerated by the use of a displacing agent and reused without off site regeneration.

Dans un processus de production d'acides dicarboxyliques aromatiques comprenant la dismutation d'un sel d'un acide monocarboxylique ou dicarboxylique aromatique visant à produire le sel inaltéré d'un acide monocarboxylique ou dicarboxylique aromatique et le sel de l'acide dicarboxylique aromatique désiré, on décrit une méthode pour séparer le sel du produit désiré du sel inaltéré, qui consiste à passer sur un adsorbent comprenant un charbon actif le sel inaltéré et le sel du produit désiré placés dans une solution aqueuse. Ce processus convient particulièrement lorsqu'on veut séparer du naphtoate de potassium de 2,6-K2NDA, après avoir effectué la dismutation du naphtoate de potassium pour produire 2,6-K2NDA et 1- ou 2-naphthoate de potassium. L'adsorbent peut être régénéré au moyen d'un agent de déplacement, et réutilisé sans recourir à une régénération à l'extérieur.

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