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Rabat, Morocco

Matricarde Falleiro R.M.,LPT | Meirelles A.J.A.,EXTRAE | Krahenbuhl M.A.,LPT
Journal of Chemical Thermodynamics

(Vapor + liquid) equilibrium (VLE) data for three binary mixtures of saturated fatty acids were obtained by differential scanning calorimetry (DSC). However, changes in the calorimeter pressure cell and the use of hermetic pans with holes (φ{symbol} = 250 mm) in the lids were necessary to make it possible to apply this analytical technique, obtaining accurate results with smaller samples and shorter operational times. The systems evaluated in this study were: myristic acid (C14:0) + palmitic acid (C16:0), myristic acid (C14:0) + stearic acid (C18:0), and palmitic acid (C16:0) + stearic acid (C18:0), all measured at 50 mm Hg and with mole fractions between 0.0 and 1.0 in relation to the most volatile component of each diagram. The fugacity coefficients for the components in the vapor phase were calculated using the Hayden and O'Connell method [J.G. Hayden, J.P. O'Connell, Ind. Eng. Chem. Process Design Develop. 14 (3) (1975) 209-216] and the activity coefficients for the liquid phase were correlated with the traditional gE models (NRTL [H. Renon, J.M. Prausnitz, Aiche J. 14 (1968) 135-144], UNIQUAC [D.S. Abrams, J.M. Prausnitz, Aiche J. 21 (1975) 116-128], and Wilson [J.M. Prausnitz, N.L. Linchtenthaler, E.G. Azevedo, Molecular Thermodynamics of Fluid-phase Equilibria, River-Prentice Hall, Upper Saddle, 1999]). The sets of parameters were then compared in order to determine which adjustments best represented the VLE. © 2009 Elsevier Ltd. All rights reserved. Source

Driouich M.,LPT | Gueraoui K.,LPT | Gueraoui K.,University of Ottawa | Haddad Y.M.,University of Ottawa | And 5 more authors.
International Review on Modelling and Simulations

The main objective of this work is to establish a numerical code for studying the flow of molten polymers in rigid pipes. Using an iterative numerical method based on finite differences, we determine the profiles of the fluid velocity, the temperature and the apparent viscosity of the fluid. The numerical code presented can also be applied to other industrial applications. © 2010 Praise Worthy Prize S.r.l. - All rights reserved. Source

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