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    • 5. 发明授权
    • Production and recovery of organic acids
    • 生产和回收有机酸
    • US5766439A
    • 1998-06-16
    • US752803
    • 1996-11-20
    • Aharon M. EyalWilliam F. Lehnhardt
    • Aharon M. EyalWilliam F. Lehnhardt
    • C12P7/40C12P7/56C12P7/52C07C51/42C07C59/08C25B3/00
    • C12P7/56C12P7/40Y10S435/803
    • A process is described for producing organic acids such as lactic acid. The process includes the steps of producing lactic acid by fermentation, resulting in an aqueous fermentation broth containing lactic acid, and adding a calcium base, such as calcium carbonate, to the fermentation broth, thereby producing calcium lactate in the broth. Biomass is removed from the broth, thereby leaving an aqueous solution or dispersion of calcium lactate. The calcium lactate is reacted with a source of ammonium ions, such as ammonium carbonate, or a mixture of ammonia and carbon dioxide, thereby producing an ammonium lactate. Contaminating cations can be removed by ion exchange. The free lactic acid or a derivative thereof can be separated from the ammonium ions, preferably by salt-splitting electrodialysis.
    • 描述了用于生产有机酸如乳酸的方法。 该方法包括通过发酵生产乳酸的步骤,得到含有乳酸的含水发酵液,并向发酵液中加入钙碱如碳酸钙,从而在肉汤中产生乳酸钙。 从肉汤中除去生物质,从而留下乳酸钙的水溶液或分散体。 将乳酸钙与铵离子源如碳酸铵或氨和二氧化碳的混合物反应,从而产生乳酸铵。 污染的阳离子可以通过离子交换去除。 游离乳酸或其衍生物可以与铵离子分离,优选通过盐分解电渗析。