ation in the feed kerosene, (Xr) is the benzoic acid concentration in the raffinate, (Ys) is the benzoic acid concentration in the extract, and (N) is the number of theoretical stages. With the number of stages determined and knowing the height of the experimental column, the following equation taken from Perrys Handbook (6thedition) is used to calculate the HETS: Equation. 2Where (Zt) is the actual height of the experimental column, (N) is the number of theoretical stages, and (HETS) is the height of the equivalent theoretical stages. IV. Results and Conclusion.At steady state and a flowrate of 0.361 (gal/min) the number of theoretical stages is equal to 1.76 and the HETS is equal to 27.71 inches. For a kerosene flowrate of 0.157 (gal/min) the number of theoretical stages is equal to 0.87 and the HETS is equal to 56.42 inches. We consider both of the steady state conditions to have given good separations. We also believe the correlation between the pH of the aqueous benzoic acid solution and the actual acid concentration to be accurate. We recommend that the liquid-liquid extraction column in the senior laboratory be used more. The process is very interesting and appears to work well.NomenclatureSymbolDefinitionUnitsXfConcentration of benzoic acid in the feed kerosene(gm/mL)XrConcentration of benzoic acid in the raffinate(gm/mL)YsConcentration of benzoic acid in the extract(gm/mL)mslope of the equilibrium linedimensionseextraction factordimensionsNnumber of theoretical stagesdimensionsZtactual height of experimental column(inches)HETSheight of equivalent theoretical stages(inches)ReferencesRobbins, L. A., Liquid-Liquid Extraction, in Perrys Chemical Engineers Handbook, Sixth Ed., D. Green and R. H. Perry, McGraw Hill, New York, NY, p 51-1, (1984)Allerton, J., Liquid Extraction in Perforated-Plate and Packed Towers. American Institute of Chemical Engineers. 39:361-384 (1943)....
