| 摘要 |
"SEPARATION OF CITRIC ACID FROM FERMENTATION BROTH WITH A NON-ZEOLlTE POLYMERIC ADSORBENT' Citric acid is separated from a fermentation broth by using a waterinsoluble polymeric adsorbent selected from the group consisting of a neutral, crosslinked polystyrene polymer, a nonionic hydrophobic polyacrylic polyacrylicester polymer, a weakly basic anionic exchange resin possessing tertiary amine or pyridine functional groups, and a strongly basic anionic exchange resin possessing quaternary amine functional groups and mixtures thereof and a desorbent comprising water or an inorganic acid or a ketone or mixtures thereof. The pH of the feed is preferentially adjusted and maintained below the first ionization constant (pKal) of citric acid in order to maintain selectivity. |
