公开(公告)号：EP1212279A2

公开(公告)日：2002-06-12

申请号：EP00957331.2

申请日：2000-08-08

申请人： SHELL INTERNATIONALE RESEARCHMAATSCHAPPIJ B.V.

发明人： BROWNSCOMBE, Thomas, F.

IPC分类号： C07C51/43 ,  C07C63/26 ,  C07C63/38 ,  C07C63/307 ,  C07C63/15 ,  C07C63/337

CPC分类号： C08G63/189 ,  B01J27/232 ,  C07C51/02 ,  C07C51/15 ,  C07C51/265 ,  C07C51/412 ,  C07C51/416 ,  C07C51/42 ,  C07C51/43 ,  C07C51/47 ,  C07C51/487 ,  C07C63/38 ,  C07C63/15 ,  C07C63/24 ,  C07C63/36 ,  C07C63/16 ,  C07C63/26 ,  C07C63/307

摘要： 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.