ter working on the process we would recommend that it be used more often. We also believe the results obtained from our experiments are accurate and well within experimental error. Liquid-Liquid ExtractionTable of ContentsSUMMARYI.INTRODUCTIONII. THEORYIII. APPARATUS AND PROCEEDUREIV. RESULTS AND CONCLUSIONNOMENCLATUREREFERENCESList of Figures1.pH vs. BENZOIC ACID CONCENTRATION2.EQUILIBRIUM CURVE 3.EQULIBRIUM CURVE WITH OPERATING LINESList of Equations1.NUMBER OF THEORETICAL STAGES2.HEIGHT OF EQUIVALENT THEORETICAL STAGESSUMMARYLiquid-Liquid Extraction of Benzoic AcidThe number of theoretical stages and the height of the equivalent theoretical stages were determined for a liquid-liquid extraction process in the senior laboratory. The process transferred benzoic acid form kerosene to water through a stirred liquid-liquid extraction column. The column was operated at two different steady state conditions to compare benzoic acid concentrations for various flow rates. From the experiment it was determined that the number of theoretical stages were 1.76 and 0.87 for flow rates of 0.361 (gal/min) and 0.157 (gal/min) respectively. The height of the equivalent theoretical stages for the above conditions were found to be 27.71 inches and 56.42 inches respectively, they were calculated using a column height of 48.9 inches. It is recommended that the experiment be repeated at different steady state conditions and at the same conditions as above to verify the results. It is also suggested that several different methods be used to determine the concentration of the benzoic acid in the kerosene. I. Introduction.Liquid-liquid extraction is very common in industry and can be used to easily separate components that would otherwise be inseparable. This mass transfer operation takes advantage of the solubility of benzoic acid and two immiscible liquids. Good contact surface area, contact time, and the correct solvent choice are all very importa...
