Patent ID: 7772424
Filing Date: 2010-08-10
Classification: C07C

Abstract:
1. A process for making a polycarboxylic acid composition, said process comprising: (a) subjecting an oxidizable compound to oxidation in a primary oxidation zone to thereby produce an initial slurry comprising a polycarboxylic acid and an initial liquid, wherein less than about 10 weight percent of said initial liquid is formed of aromatic compounds; wherein said initial slurry has at least 10 wt % solids; (b) subjecting at least a portion of said initial slurry to oxidative digestion in a digestion zone to thereby produce a secondary slurry comprising a secondary solid and a secondary liquid; and (c) concentrating said secondary slurry in a concentrating zone to thereby produce a concentrated slurry having an increased solids concentration relative to said secondary slurry, wherein said concentrating includes evaporating at least about 10 percent of the mass of said secondary liquid.