C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 51/43 (2006.01) B01J 27/232 (2006.01) C07C 51/02 (2006.01) C07C 51/15 (2006.01) C07C 51/265 (2006.01) C07C 51/41 (2006.01) C07C 51/42 (2006.01) C07C 51/47 (2006.01) C07C 51/487 (2006.01) C07C 63/15 (2006.01) C07C 63/26 (2006.01) C07C 63/307 (2006.01) C07C 63/337 (2006.01) C07C 63/38 (2006.01) C08G 63/189 (2006.01)
Patent
CA 2383346
A method is provided to produce dicarboxylic or tricarboxylic aromatic acid from salts of such acids, the method including the steps of providing an aqueous solution of a salt of a dicarboxylic or tricarboxylic aromatic acid, the aqueous solution having a pH of about 7 or greater; contacting the aqueous solution with sufficient carbon dioxide to lower the pH of the aqueous solution resulting in precipitation of at least a portion of the dicarboxylic or tricarboxylic aromatic acid; separating precipitated dicarboxylic or tricarboxylic aromatic acid from the solution; and recovering carbon dioxide from the solution.
L'invention concerne un procédé utilisé pour produire un acide aromatique dicarboxylique ou tricarboxylique à partir de sels de ces mêmes acides. Ce procédé comporte les étapes suivantes : (a ) produire une solution aqueuse d'un sel d'acide aromatique dicarboxylique ou tricarboxylique, cette solution aqueuse possédant un pH environ égal ou supérieur à 7; (b) mettre en contact cette solution aqueuse avec une quantité suffisante de dioxyde de carbone pour abaisser le pH de la solution aqueuse, ce qui revient à précipiter au moins une partie de l'acide aromatique dicarboxylique ou tricarboxylique; (c) séparer l'acide aromatique dicarboxylique ou tricarboxylique de la solution; enfin (d) retirer le dioxyde de carbone de la solution.
Mossi & Ghisolfi Overseas S.a.
Smart & Biggar
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