Phase Distribution of Ethanol, and Water in Ethyl Esters at K and K
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1 Phase Distribution of Ethanol, and Water in Ethyl Esters at K and K Luis A. Follegatti Romero, F. R. M. Batista, M. Lanza, E.A.C. Batista, and Antonio J.A. Meirelles a ExTrAE Laboratory of Extraction, Applied Thermodynamics and Equilibrium, Department of Food Engineering, Faculty of Food Engineering, University of Campinas, UNICAMP, Zip Code , Campinas, SP, Brazil, tomze@fea.unicamp.br. ABSTRACT The most common method to purify biodiesel is washing with water. Washing the biodiesel is necessary in order to improve its fuel properties, largely by removing residual free glycerol and small amount of the catalyst, excess of ethanol and soap. During biodiesel washing process there are two phases, the water rich phase and ethyl esters rich phase. The goal of the present work is to study the inter solubility of ethyl linoleate/ethyl oleate/ethyl stearate + ethanol + water at temperatures between and (± ) K. The high ethanol distribution coefficients make water washing a very effective way of recovering ethanol from the ester rich phase generated at the end of the ethanolysis reaction. An increase of the system solubilities was observed with increasing temperature. The low deviation obtained in the global mass balance indicate the good quality of the equilibrium data for the systems of interest in biodiesel washing process at temperatures between and K, containing different ethyl esters (linoleate, oleate, and estearate) + ethanol + water. Keywords: Biodiesel; liquid-liquid equilibrium; transesterification; washing; ethyl esters; ethanol. INTRODUCTION The transesterification reaction can generate very pure ethylic esters, but a purification step is usually required in order to separate the esters obtained from the glycerol, the excess of alcoholic reagent, the residual acylglycerols that did not react, and from any contaminants introduced into the process together with the reagents, such as other minor fatty compounds. The purity grade of biodiesel has an important influence on its fuel properties, so it must be almost free of water, alcohol, glycerol, catalyst and acylglycerols. The washing of biodiesel is used to remove the residues of ethanol, glycerol, catalyst and soaps. Karaosmanoğlu et al. tested different alternatives for purifying biodiesel and selected washing with hot distilled water at K as the best refining option, capable of producing a biofuel with purity of around 99%. Despite the importance of this purification step, experimental equilibrium data on the two phases formed during biodiesel washing are scarce, especially in the case of ethylic biodiesel. Some research groups have recently published experimental results on the phase behaviour of the reactants and products present in the biodiesel reaction. Follegatti Romero et al. investigated the liquid liquid equilibrium of the ethyl laurate/ethyl myristate + ethanol + water system at , and K and compared the experimental data with predictions by the CPA EoS model. In this work, liquid liquid equilibrium data for the following ternary systems of interest in the production of ethylic biodiesel were investigated: ethyl linoleate/ethyl oleate/ethyl stearate + ethanol + water between and (± ) K. MATERIALS & METHODS Ethyl linoleate, ethyl oleate and ethyl stearate used in this work were purchased from Sigma Aldrich, and their mass purities were 99.7, 77.5 and 99.8 %, respectively. The solvents used were anhydrous ethanol from Merck (Germany), with a mass purity of 99.9 %, and acetonitrile from Vetec, with a mass purity of 99.8 %. Quantification of ethyl esters and ethanol was carried out in a Shimadzu VP series HPLC equipped with two LC 10ADVP solvent delivery units for binary gradient elution, a model RID10A differential refractometer, a automatic injector with an injection volume of 20 μl, a model CTO-10ASVP column oven for precision
2 temperature control even at subambient temperatures, a single ODS column (250 mm 4.6 mm ID, 5 mm), a model SCL 10AVP system controller, and LC Solution 2.1 software for remote management. The water content of both phases was determined by Karl Fischer titration using a model 701 Metrohm apparatus (Switzerland) equipped with a 5 ml burette. The Karl Fischer reagent used in the titration was from Merck (Germany). The experiments were realized using glass test tubes with screw caps (32 ml). Known quantities of each component were weighed on an analytical balance with a precision of 001 g (Precisa, model XT220A, Sweden), and added directly to the glass test tubes. The mixture of ethyl ester, ethanol, and water was maintained under intensive agitation for 10 min at constant temperature and pressure using a test tube shaker (Phoenix, model AP 56). The ternary mixture was then left at rest for 24 h in a thermostatic water bath at the desired temperature, until two separate, transparent liquid phases were clearly observed. At the end of the experiment, samples were taken separately from the upper and bottom phases using syringes containing previously weighed masses of acetonitrile, so as to guarantee an immediate dilution of the samples and avoid further separation into two liquid phases at ambient temperature. The samples from the two phases were analyzed by liquid chromatography (HPLC). The quantitative determination was carried out using calibration curves (external calibration) obtained using standard solutions for each system component: ethyl linoleate, ethyl oleate, ethyl stearate and ethanol. These compounds were diluted with acetonitrile in the concentration range from 100 mg/ml. The experimental data for each tie line were replicated at least three times and the values reported in the present work are the average ones. The mass fractions of ethyl esters and ethanol were determined from the areas of the corresponding HPLC chromatographic peaks, adjusted by the response factors obtained by previous calibration. The water mass fractions were also determined at least three times using the Karl Fisher titration and the values reported are the average ones. RESULTS & DISCUSSION The type A standard uncertainties of the equilibrium compositions ranged from (05 to 882) % by mass for ethyl esters, (30 to 578) % for ethanol and (88 to 43) % for water, with the lowest figures associated with the lowest mass fractions within the composition range investigated. On the basis of the total system mass and of the phase and overall compositions, the mass balances were checked according to the procedure suggested by Marcilla et al. and recently applied to fatty systems by Follegatti-Romero et al. According to this procedure, the masses of both liquid phases were calculated and checked against the total initial mass used in the experimental runs. The average results obtained for the mass balance deviations of each set of experimental data were lower than 0 %, which indicates the good quality of the experimental data. The high ethanol distribution coefficients make water washing a very effective way of recovering ethanol from the ester rich phase generated at the end of the ethanolysis reaction (see Figure 1). Figures 2 to 4 show the equilibrium diagrams for the systems containing FAEEs (ethyl linoleate, oleate and stearate) + anhydrous ethanol + water at temperatures between K to K. As can be observed in these figures, the solubility in the ternary mixture was enhanced by the increase in temperature.
3 WP w EP w 3 Figure 1. Distribution diagram for ethyl esters (1,2,3) + ethanol (4) + water (5): ( ), linoleate (1); ( ), oleate (2); ( ), stearate (3). w 1 Figure 2. Liquid liquid equilibrium for the system containing ethyl linoleate (1) + ethanol (4) + water (5): experimental ( ) tie lines ( ) at K.
4 w 2 Figure 3. Liquid liquid equilibrium for the system containing ethyl oleate (2) + ethanol (4) + water (5): experimental ( ) tie lines ( ) at K. w 3 Figure 4. Liquid liquid equilibrium for the system containing ethyl stearate (2) + ethanol (4) + water (5): experimental ( ) tie lines ( ) at K.
5 CONCLUSION Equilibrium data were measured for the ethyl linoleate/ethyl oleate/ethyl stearate + ethanol + water systems at several temperatures. The high ethanol distribution coefficients make water washing a very effective way of recovering ethanol from the ester rich phase generated at the end of the ethanolysis reaction. REFERENCES [1] Karaosmanoğlu, F.; Cigizoglu, K. B.; Tuter, M.; Ertekin, S Investigation of the Refining Step of Biodiesel Production. Energy Fuels, 10, [2] Tizvar, R.; McLean, D. D.; Kates, M.; Dubé, M. A Liquid Liquid Equilibria of the Methyl Oleate Glycerol Hexane Methanol system. Ind. Eng. Chem. Res. 47, [3] Follegatti Romero L. A.; Lanza M.; Batista F. R. M.; Batista E. A. C.; Oliveira M. B.; Coutinho J. A. P.; and Meirelles A. J. A Liquid Liquid Equilibrium for Ternary Systems Containing Ethyl Esters, Anhydrous Ethanol and Water at , , and K. J. Chem. Eng. Data, 49, [4] Marcilla, A.; Ruiz, F.; Garcia, A. N Liquid Liquid-Solid Equilibria of the Quaternary System Water Ethanol Acetone-Sodium Chloride at 25 Degrees C. Fluid Phase Equilib, 112, [5] Follegatti Romero L. A.; Lanza, M.; da Silva, C. A. S.; Batista, E. A. C and Meirelles, A. J. A Mutual Solubility of Pseudobinary Systems Containing Vegetable Oils and Anhydrous Ethanol at ( to ) K. J. Chem. Eng. Data, 55,
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