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KMID : 0380020060210030199
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Korean Journal of Biotechnology and Bioengineering
2006 Volume.21 No. 3 p.199 ~ p.203
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Recovery of Lactic Acid from Fermentation Broth Using Precipitation and Reactive Distillation
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Park Suk-Chan
Lee Sang-Mok
Kim Young-Jun
Kim Woo-Sik
Koo Yoon-Mo
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Abstract
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Precipitation and reactive distillation were employed to recover lactic acid from fermentation broth. Lime was initially added to fermentation broth in order to convert soluble lactic acid to an insoluble calcium lactate form. Drowning-out crystallization was used to decrease the solubility of calcium lactate by adding ethanol as a co-precipitant. In the ideal solution of organic acids as well as fermentation broth, precipitation experiments were performed with varying amounts of ethanol. Precipitation process was followed by reactive distillation. Carboxylate salts formed in the previous precipitation process were mixed with carbon dioxide and triethylamine to precipitate as calcium carbonate. The remaining liquid was distilled for 1hr at different temperatures. Triethylamine and water were recovered from the top of the distiller, while organic acids, inducing lactic acid as a main component remained in feeding bottle. The yield of recovered lactic acid was 67.5% with the purity of 99.7%.
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KEYWORD
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Lactic acid, calcium Lactate, drowning-out crystallization, precipitation, reactive distillation
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