Patent ID: 9409849
Filing Date: 2016-08-09
CPC Classification: C07C,C22B,Y02P

Claim Text:
1. A process comprising: (a) producing a residue stream from manufacture of an aromatic polycarboxylic acid; (b) separating the residue stream into a solid aromatic dicarboxylic acid rich stream, an aqueous stream rich in catalyst metal, acetic acid and aromatic tricarboxylic acid, and an organic stream rich in an aromatic monocarboxylic acid using a solvent extraction and (c) separating at least one aromatic polycarboxylic acid from the dicarboxylic acid rich stream wherein the separation process in step (b) comprises simultaneous extraction of the residue stream with two liquid phases, followed by filtration, wherein the simultaneous extraction of residue comprises the use of water and an organic solvent comprising at least one member selected from the group consisting of toluene, benzene, cylcohexane, petroleum ether, methanol and mixtures thereof.