2012 : Liquid-Liquid Extraction to Separate Ethanol from Synthetic Broth Using n-Amyl Alcohol and 1-Dodecanol as Solvent in Packed Column

Prof.Ir. Ali Altway M.Sc


Abstract

This paper describes a search for ethanol and water separation performance and high performance solvents to be used in liquid-liquid solvent extraction of ethanol from dilute aqueous solutions by depending effective product recovery from the solvent. The present study was conducted theoretically and experimentally to analyze the performance of packed column that was expressed as% recovery of ethanol by using some solvents ie, n-amyl alcohol and 1-dodecanol and by varyng the solvent flow rate and type of packing. The extraction process was done to support the extractive fermentation process in producing bioethanol. The theoretical approach was carried out by developing a mathematical model in determining the extraction recovery percentage. The development of mathematical model required the mass transfer coefficient in dispersed and continuous phases that were obtained from empirical correlation by Siebert and Fair (1988) and Kumar and Hartland (1999) and ethanol distribution coefficient that was obtained experimentally. The mathematical model consists of a nonlinear ordinary differential equation, which was solved numerically using Euler method under MATLAB 6.1 environment. The study used the synthetic broth (10% ethanol, 3% sugar, 87% water) entering extraction column 3 cm in diameter filled with raschig rings packing (7mm x 10 mm) and glass ball packing (6 mm) to the height of 35 cm. The flow rate of solvent was varied 10-40 cm3/s. The theoretical study has been carried out in this research concerning the extraction of ethanol from synthetic fermentation broth using organic solvent (1-dodecanol and n-amyl …