Recovery of Acetic Acid from Diluent Aqueous Solution by Solvent Extraction

Methods to recover acetic acid from diluent aqueous solution, glyoxal and waste water of producing methacrylic acid have been developed. A new process to extract HAc is to use a mixed solvent consisting of tertiary amine and tributyl phosphate. Various factors such as composition of the mixed solvents, concentrations of HAc, (HAc + HNO_3) and (HAc + MAA), contact time, and temperature were studied.The data of liquid-liquid equilibrium have been measured and related. A preliminary discussion of the extractive mechanism is also outlined.