Determination of Optimum Condition of Tri-n-Butylamine Solvent Recovery Tri-n-Butylamine by Evaporation for Liquid Liquid Extraction of Lactic Acid

Miranti Miranti, Misri Gozan

Abstract

This study evaluated the optimum condition of solvent recovery by evaporation method for the liquid-liquid extraction of lactic acid. The aspects observed in this study include the separation coefficient and the concentration of lactic acid obtained as the product of evaporation. Independent variables used are variations of temperature (110, 120 and 130 oC), and operating pressure (20, 30, and 40 mbar). Analyzes have been performed by using volume balance and characterization test using HPLC method. The result of this study indicate that the decrease of operating pressure, as well as temperature rises, can increase the performance of evaporation. However, at temperature above 120 oC, degradation of lactic acid happened, so that the amount of TBA that evaporated is lower. The optimum operating conditions at TBA recovery process is at temperature of 120 oC and pressure at 20 mbar with distribution coefficient 0.78. Lactic acid concentration that obtained at the optimum conditions is 76% (v/v). This study prove that the vacuum evaporation method can be used in the solvent recovery process of liquid-liquid extraction of lactic acid.

Keywords—Lactic acid, Liquid-Liquid Extraction, Rotary vacuum Evaporator, Solvent recovery, Tri-n-Butylamine

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