(Vapor + liquid) equilibrium for the binary systems {water + glycerol} and {ethanol + glycerol, ethyl stearate, and ethyl palmitate} at low pressures

Abstract This work reports the experimental measurements {(vapor + liquid) equilibrium} for the systems {water(1) + glycerol(2)}, {ethanol(1) + glycerol(2)}, {ethanol(1) + ethyl stearate(2)}, and {ethanol(1) + ethyl palmitate(2)}. Boiling temperatures were measured using an Othmer-type ebulliometer over a pressure range of 14 kPa to 96 kPa. The experimental data were well correlated using the NRTL and UNIQUAC models. The performance of the UNIFAC-Dortmund model in relation to predicting the phase equilibrium of the systems was also studied.

[1]  Esteban A. Brignole,et al.  Phase equilibria in ternary mixtures of methyl oleate, glycerol, and methanol , 2008 .

[2]  António J. Queimada,et al.  Phase equilibria of glycerol containing systems and their description with the Cubic-Plus-Association (CPA) Equation of State , 2009 .

[3]  William H. Press,et al.  Numerical recipes in C. The art of scientific computing , 1987 .

[4]  R. Reid,et al.  The Properties of Gases and Liquids , 1977 .

[5]  L. C. Meher,et al.  Technical aspects of biodiesel production by transesterification—a review , 2006 .

[6]  B. Satyavathi,et al.  Experimental (vapour + liquid) equilibrium data of (methanol + water), (water + glycerol) and (methanol + glycerol) systems at atmospheric and sub-atmospheric pressures , 2010 .

[7]  David H. T. Chen,et al.  Isobaric vapor-liquid equilibriums for the systems glycerol-water and glycerol-water saturated with sodium chloride , 1970 .

[8]  William H. Press,et al.  Book-Review - Numerical Recipes in Pascal - the Art of Scientific Computing , 1989 .

[9]  Yongsheng Guo,et al.  Volatility of Blended Fuel of Biodiesel and Ethanol , 2007 .

[10]  J. Gmehling,et al.  A modified UNIFAC model. 1. Prediction of VLE, hE, and .gamma..infin. , 1987 .

[11]  J. Marchetti,et al.  Possible methods for biodiesel production , 2007 .

[12]  Ram Prasad,et al.  TRIGLYCERIDES-BASED DIESEL FUELS , 2000 .

[13]  J. Prausnitz,et al.  Statistical thermodynamics of liquid mixtures: A new expression for the excess Gibbs energy of partly or completely miscible systems , 1975 .

[14]  J. F. González,et al.  Biodiesel Fuels from Vegetable Oils: Transesterification of Cynara cardunculus L. Oils with Ethanol , 2002 .

[15]  Hüseyin Serdar Yücesu,et al.  The potential of using vegetable oil fuels as fuel for diesel engines , 2001 .

[16]  Shin-ichi Sakai,et al.  Application of UNIFAC models for prediction of vapor–liquid and liquid–liquid equilibria relevant to separation and purification processes of crude biodiesel fuel , 2009 .

[17]  J. Prausnitz,et al.  LOCAL COMPOSITIONS IN THERMODYNAMIC EXCESS FUNCTIONS FOR LIQUID MIXTURES , 1968 .

[18]  Esteban A. Brignole,et al.  Phase equilibria modeling of biodiesel related mixtures using the GCA-EoS model , 2010 .