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    • 6. 发明申请
    • Reactive Extraction of Free Organic Acids from the Ammonium Salts Thereof
    • 从其铵盐中反应提取游离有机酸
    • US20100210871A1
    • 2010-08-19
    • US12706512
    • 2010-02-16
    • Christoph KoblerDieter BussAxel RonneburgChristoph Weckbecker
    • Christoph KoblerDieter BussAxel RonneburgChristoph Weckbecker
    • C07F9/535C07C61/00C07C59/01C07C59/10C07C53/126C07C309/25
    • C07F9/3834C07C51/02C07C51/48C07C303/22C07C319/20C07C2602/42C07C59/01C07C59/08C07C53/126C07C323/52C07C309/27
    • The invention relates to a process for converting ammonium salts of organic acids to the particular free organic acid, wherein an aqueous solution of the ammonium salt is contacted with an organic extractant and the salt is dissociated at temperatures and pressures at which the aqueous solution and the extractant are in the liquid state, and a stripping medium or entraining gas is introduced in order to remove NH3 from the aqueous solution and transfer at least a portion of the free organic acid formed to the organic extractant. The invention described here thus provides an improved process for releasing an organic acid, preferably a carboxylic, sulphonic or phosphonic acid, especially an alpha-hydroxycarboxylic acid or beta-hydroxycarboxylic acid, from the ammonium salt thereof by release and removal of ammonia and simultaneous extraction of the acid released with a suitable extractant from the aqueous phase. This process corresponds to a reactive extraction. The reactive extraction of an organic acid from the aqueous ammonium salt solution thereof can be improved significantly by the use of a stripping medium or entraining gas, for example nitrogen, air, steam or inert gases, for example argon. The ammonia released is removed from the aqueous solution by the continuous gas stream and can be fed back into a production process. The free acid can be obtained from the extractant by a process such as distillation, rectification, crystallization, re-extraction, chromatography, adsorption, or by a membrane process.
    • 本发明涉及将有机酸的铵盐转化为特定的游离有机酸的方法,其中铵盐的水溶液与有机萃取剂接触,并且盐在水溶液和 萃取剂处于液体状态,并且引入汽提介质或夹带气体以从水溶液中除去NH 3并将至少一部分形成的游离有机酸转移到有机萃取剂中。 因此,这里描述的发明提供了一种通过释放和除去氨并同时提取从其铵盐中释放有机酸,优选羧酸,磺酸或膦酸,特别是α-羟基羧酸或β-羟基羧酸的改进方法 的酸从水相中用合适的萃取剂释放。 该过程对应于反应萃取。 通过使用汽提介质或夹带气体,例如氮气,空气,蒸气或惰性气体,例如氩气,可以显着地改善有机酸从其铵盐水溶液中的反应萃取。 释放的氨通过连续气流从水溶液中除去,并可以反馈到生产过程中。 游离酸可以通过蒸馏,精馏,结晶,再萃取,色谱法,吸附法或膜法等方法从萃取剂得到。