C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
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 63/38 (2006.01) C08G 63/189 (2006.01)
Patent
CA 2383232
Disclosed is a process for purifying 2,6-naphthalene dicarboxylic acid produced by disproportionation and more efficiently recycling byproduct dipotassium salts which includes the steps of: a) Contacting an aqueous solution containing the disalt of 2,6-NDA(2,6-K2NDA) with carbon dioxide to form as a precipitate the monopotassium salt of 2,6-NDA (KHNDA) and an aqueous solution containing 2,3-KHNDA, K2NDA, and potassium bicarbonate; b) Disproportionating said monopotassium salt (KHNDA) to form 2,6-NDA and an aqueous solution containing K2NDA, and potassium bicarbonate; c) Separating said 2,6-NDA and concentrating said aqueous solution containing K2NDA and potassium bicarbonate by reverse osmosis.
L'invention concerne un procédé permettant la purification d'acide 2,6-naphthalène dicarboxylique produit par dismutation, ainsi qu'un recyclage plus efficace du sous-produit constitué par des sels dipotassiques. Ce procédé comprend les étapes suivantes : a) on met en contact une solution aqueuse contenant le disel de 2,6-NDA (2,6-K2NDA) avec du dioxyde de carbone afin d'obtenir le sel monopotassique de 2,6-NDA (KHNDA) sous forme de précipité et une solution aqueuse contenant 2,3-KHNDA, K2NDA, et du bicarbonate de potassium; b) on soumet ce sel monopotassique (KHNDA) à une réaction de dismutation afin d'obtenir du 2,6-NDA et une solution aqueuse contenant du K2NDA, et du bicarbonate de potassium; c) On sépare ce 2,6-NDA et on concentre la solution aqueuse contenant du K2NDA et du bicarbonate de potassium au moyen d'une osmose inverse.
Diaz Zaida
Rodden John B.
Mossi & Ghisolfi Overseas S.a.
Smart & Biggar
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