| 摘要 |
PURPOSE:To deposit and purify a dicarboxylic acid useful as a raw material for synthetic resins, insect pheromones, musk perfumes, etc., by adjusting an aqueous solution of an alkali metal salt of a crude long-chain dicarboxylic acid produced by a fermentation method to a specific pH. CONSTITUTION:An aqueous solution of a crude alkali metal salt of a long-chain dicarboxylic acid produced by a fermentation method, preferably brasylic acid is kept at preferably 20-30 deg.C and a mineral acid is slowly added to adjust the pH to 5.5-6.5. Thereby the above-mentioned dicarboxylic acid is deposited, filtered and dried to afford the aimed high-purity dicarboxylic acid.
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