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Optimization of Precipitation Process for the Recovery of Lactic Acid

Lactic acid 회수를 위한 침전공정 최적화

  • Choi, Kook-Hwa (Department of Chemical Engineering, Kongju National University) ;
  • Chang, Yong-Keun (Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology) ;
  • Kim, Jin-Hyun (Department of Chemical Engineering, Kongju National University)
  • 최국화 (공주대학교 화학공학부) ;
  • 장용근 (한국과학기술원 생명화학공학과) ;
  • 김진현 (공주대학교 화학공학부)
  • Received : 2010.12.07
  • Accepted : 2011.02.14
  • Published : 2011.02.28

Abstract

In this study, precipitation process was developed for the recovery of the lactic acid from calcium lactate fermentation broth. Calcium lactate yield was improved by decreasing the solubility of calcium lactate through the addition of ethanol (25%, v/v) as a co-precipitant. The optimal lime type, lime concentration, stirrer speed, precipitation time, temperature, and solvent amount for $Ca(LA)_2$ precipitation were CaO, 0.0175 g/mL, 220 rpm, 24 h, $5^{\circ}C$, ethanol 25% (v/v), respectively. Lactic acid was easily and efficiently recovered from precipitated $Ca(LA)_2$ by adding sulfuric acid ($Ca(LA)_2/H_2SO_4$ molar ratio=1:1). In the model solution of organic acids and fermentation broth, the overall yields of recovered lactic acid were 62% and 55%, respectively, under the aforementioned optimal conditions.

Acknowledgement

Grant : Industrial Source Technology Development Programs

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