Production and recovery of organic acids

Details Production and recovery of organic acids Production and recovery of organic acids

1996-11-20

1998-06-16

Lilling, Herbert J.

Chemistry: electrical and wave energy

Processes and products

Electrophoresis or electro-osmosis processes and electrolyte...

204519, 204522, 204527, 204530, 204534, 204537, 204637, 210259, 210651, 210654, 435135, 435136, 435139, 435142, 435145, 435146, 435803, 562578, 562580, 562586, 562593, C12P 752, C25B 300, C07C 5142, C07C 5908

Patent

active

057664390

ABSTRACT:
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.

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