20120259138 | METHODS AND SYSTEMS OF PRODUCING DICARBOXYLIC ACIDS - A method of producing succinic acid (SA) includes providing fermentation derived diammonium succinate (DAS) containing solution, converting the DAS containing solution to a solution containing a half-acid, half-salt of succinic acid (MXS) by reactive evaporation, crystallizing MXS from the MXS containing solution by cooling and/or evaporative crystallization, converting MXS to SA by biopolar membrane electrodialysis, anion exchange, cation exchange, or a combination thereof, and crystallizing SA from SA the containing solution generated during conversion of the MXS to SA by cooling and/or evaporative crystallization. | 10-11-2012 |