DOI:
https://doi.org/10.14483//udistrital.jour.RC.2016.25.a11Published:
08/31/2016Issue:
Vol. 25 No. 2 (2016): May-August 2016Section:
Science and EngineeringNueva correlación generalizada para estimar la presión de vapor
A new generalized correlation for accurate vapor pressure
Keywords:
Vapor pressure, pure substances, enthalpy of vapourization, hydrocarbons, Waring’s criteria (en).Keywords:
Presión de vapor, sustancias puras, entalpía de vaporización, hidrocarburos, criterio de Waring. (es).Downloads
Abstract (es)
En el presente trabajo se propone una nueva correlación generalizada para el cálculo de la presión de vapor de sustancias puras. A partir de datos de equilibrio líquido-vapor de 28 refrigerantes y mediante minimización de la suma de los cuadrados de las desviaciones relativas de la presión de vapor, se determinó los parámetros y constantes característicos de la nueva ecuación y a partir del factor acéntrico se generaliza para cualquier sustancia pura. Se evaluó en 45 sustancias puras que no participaron en la minimización, generando porcentajes de desviación relativas promedio de 1.6073%. Se comparan los resultados obtenidos con otros modelos para el cálculo de la presión de vapor y los resultados indican que la nueva ecuación propuesta genera una mejor precisión. Finalmente se calculan entalpías de vaporización con desviaciones del 0.882% y se aplica el criterio de Waring con el fin de comprobar las constantes presentadas en la investigación.
Abstract (en)
In this work, a new generalized correlation for pure substances is proposed for the estimation of vapor pressure, applicable in wide temperature range. Was used equilibrium liquid-vapor data with 28 refrigerants and minimizing the sum of the squares of the relative deviation in liquid-vapour pressure were determined the parameters and constants characteristics of the new equation and generalized for any pure substance using the acentric factor. Vapor pressure predictions were made for 45 pure substances who they didn´t not participate in the minimization, generated percent relative average deviation of 1.6073%. The results were compared with others equations for calculating the vapor pressure and the comparison indicates that the proposed method provide more accurate results than other methods used in this work. Finally, the calculations of enthalpies of vaporization were done with deviations of 0.880% and the Waring criterion was applied to check the constants presed in this paper
References
Chapra, S. & Canale, R. (1988). Métodos Numéricos para Ingenieros, México DF, México: McGraw-Hill.
Forero G., L. A., & Velásquez J., J. A. (2011). Wagner liquid–vapour pressure equation constants from a simple methodology. The Journal of Chemical Thermodynamics, 43(8), 1235–1251.
Godavarthy, S. S., Robinson, R. L., & Gasem, K. a. M. (2006). SVRC–QSPR model for predicting saturated vapor pressures of pure fluids. Fluid Phase Equilibria, 246(1-2), 39–51.
Lasdon, L.S., Waren, A.D., Jain A. & Ratner, M. (1976). Design and Testing of a Generalized Reduced Gradient Code for Nonlinear
Programming. ACM Trans. Math. Softw. 1-45.
McGarry, J. (1983). Correlation and Prediction of the Vapor Pressures of Pure Liquids over Large Pressure Ranges. Ind. Eng. Chem. Process Des. Dev., 313–322.
Mejbri, K., & Bellagi, A. (2005). Corresponding states correlation for the saturated vapor pressure of pure fluids. Thermochimica Acta, 436(1-2), 140–149.
Mohebbi, A., Taheri, M., & Soltani, A. (2008). A neural network for predicting saturated liquid density using genetic algorithm for pure and mixed refrigerants. International Journal of Refrigeration, 31(8), 1317–1327.
NIST Chemistry WebBook. (2016). Propiedades termofísicas de sistemas fluidos. Estados Unidos de Norte America. Recuperado de http://webbook.nist.gov/chemistry/fluid/
Reid, R. C., Prausnitz, J. M. & Poling, B. E., (1987), The Properties of Gases & Liquids, Nueva York: Estados Unidos de Norte America: McGraw-Hill.
Riedel, L. (1954). Kritischer Koeffizient, Dichte des gesättigten dampfes und verdampfungswärme. untersuchungen über eine erweiterung des theorems der übereinstimmenden zustände. Teil III. Chem. Ing. Tech. 26, 679-683.
Sanjari, E. (2013). A new simple method for accurate calculation of saturated vapor pressure. Thermochimica Acta, 560, 12–16.
Sanjari, E., Honarmand, M., Badihi, H., & Ghaheri, A. (2013). An accurate generalized model for predict vapor pressure of refrigerants. International Journal of Refrigeration, 36(4), 1327–1332.
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