Patent ID: 8957249
Filing Date: 2015-02-17
Classification: C07B,C07C,C12P

Abstract:
1. A process for separating, recovering, and purifying dicarboxylic acids from a fermentation broth containing biomass, comprising the following steps: a) separating biomass from a dicarboxylic acid moiety-containing fermentation broth in at least two steps, by wherein prior to step a)1) the temperature and pH of the fermentation broth correspond to the temperature and pH used during fermentation of the formation broth; b) lowering the pH of the permeate from step a)2) to convert dicarboxylic acid salts contained in the permeate to free dicarboxylic acid, forming an acidified permeate; c) separating dicarboxylic acid from the acidified permeate by d) purifying the dicarboxylic acid-containing extract from step c)2) by a nanofiltration to form a nanofiltered permeate containing dicarboxylic acid; e) evaporating liquid from the nanofiltered permeate of step d) to increase the concentration of dicarboxylic acid to minimally about 30 weight percent, and cooling to crystallize dicarboxylic acid; and f) separating and drying crystalline dicarboxylic acid.