Lactic acid has been used in various applications such as chemicals, pharmaceuticals and food. For the production of biodegradable polylactic acid (PLA), the high purity of lactic acid is required. Lactic acid can be produced by chemical synthesis and fermentation of carbohydrates. The chemical synthesis is more expensive and only racemic mixture of lactic acid is obtained. Thus, fermentation process is preferred due to more selective production of lactic acid with different stereoisomers. Adsorption is a promising method to remove metal ions. To get high purity of lactic acid, the existence of Na(I), K (I), Ca (II), Mg (II), Fe (II) and Mn (II) ions in lactic acid fermentation broth must be removed. Coconut shell-activated carbon (CSAC) with specific pore size, high surface area and negatively charged surface was chosen as an adsorbent for the lactic acid purification. In this study, the component of lactic acid fermentation broth was investigated by Gas chromatography–mass spectrometry (GC-MS) with the trimethylsilylation reaction condition. The adsorption experiment was determined by Atomic adsorption spectroscopy (AAS) and the percentage of metal ions removal was calculated. Moreover, the adsorption isotherms will be investigated to reveal the specific relation between the equilibrium concentration of adsorbate and the adsorbed amount on the adsorbent using 4 important isotherm models; which are the Langmuir, Freundlich, Temkin, and Frumkin isotherm models, respectively.

Purification of lactic acid by using a cost-effective adsorbent: Studying of adsorption isotherm for scale-up production

2019 Spring National Meeting

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