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Evaluation of the multiphase behavior in binaries using a new technique for describing solid phases based on the soave−redlich−kwong equation of state / Yang, Quan in Industrial & engineering chemistry research, Vol. 49 N° 4 (Fevrier 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 4 (Fevrier 2010) . - pp 1905–1909 Titre : Evaluation of the multiphase behavior in binaries using a new technique for describing solid phases based on the soave−redlich−kwong equation of state Type de document : texte imprimé Auteurs : Yang, Quan, Auteur ; Zhu, Shen-Lin, Auteur ; Zhao, Tian-Sheng, Auteur Année de publication : 2010 Article en page(s) : pp 1905–1909 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Multiphase  behavior  binaries  Equation  state. Résumé : In the petroleum industry, knowledge of phase behavior is essential to solve many problems, such as the design of the catalytic cracking of heavy oil. The catalyst tends to lose activity as a result of the formation of the solid phase, so the calculation of multiphase behavior of systems containing solid phases will serve to solve the problem. The Soave−Redlich−Kwong equation of state is widely employed to evaluate multiphase behavior, but cubic equations of state are incapable of calculating the properties of solid phases and thus cannot evaluate the multiphase behavior of systems containing solid phases. In this research, a new technique for describing the solid phase has been developed. The multiphase behavior of propane binaries with ployaromatic hydrocarbons was then explored. To evaluate the critical end point, which is difficult to calculate, an algorithm combining the method of Heidemann and Khalil ( AIChE J. 1980, 26, 769−780) to compute the critical point and the tangent-plane criterion was developed previously (Yang et al. Ind. Eng. Chem. Res. 2009, 48, 6877−6881). Setting the initial guesses with the values at the obtained critical end points, the three-phase loci were then computed successfully. The calculation results show that the three-phase loci terminate at a lower critical end point (LCEP), which is wrong according to the experimental data. To correct this mistake, the newly developed technique was employed, and the quadruple points where the three-phase loci really end were evaluated successfully. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9011003 [article] Evaluation of the multiphase behavior in binaries using a new technique for describing solid phases based on the soave−redlich−kwong equation of state [texte imprimé] / Yang, Quan, Auteur ; Zhu, Shen-Lin, Auteur ; Zhao, Tian-Sheng, Auteur . - 2010 . - pp 1905–1909. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 4 (Fevrier 2010) . - pp 1905–1909 Mots-clés : Multiphase  behavior  binaries  Equation  state. Résumé : In the petroleum industry, knowledge of phase behavior is essential to solve many problems, such as the design of the catalytic cracking of heavy oil. The catalyst tends to lose activity as a result of the formation of the solid phase, so the calculation of multiphase behavior of systems containing solid phases will serve to solve the problem. The Soave−Redlich−Kwong equation of state is widely employed to evaluate multiphase behavior, but cubic equations of state are incapable of calculating the properties of solid phases and thus cannot evaluate the multiphase behavior of systems containing solid phases. In this research, a new technique for describing the solid phase has been developed. The multiphase behavior of propane binaries with ployaromatic hydrocarbons was then explored. To evaluate the critical end point, which is difficult to calculate, an algorithm combining the method of Heidemann and Khalil ( AIChE J. 1980, 26, 769−780) to compute the critical point and the tangent-plane criterion was developed previously (Yang et al. Ind. Eng. Chem. Res. 2009, 48, 6877−6881). Setting the initial guesses with the values at the obtained critical end points, the three-phase loci were then computed successfully. The calculation results show that the three-phase loci terminate at a lower critical end point (LCEP), which is wrong according to the experimental data. To correct this mistake, the newly developed technique was employed, and the quadruple points where the three-phase loci really end were evaluated successfully. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9011003

Tuning the interaction parameter for the soave-redlich-kwong equation of state using the critical end points / Yang, Quan in Industrial & engineering chemistry research, Vol. 48 N° 14 (Juillet 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 14 (Juillet 2009) . - pp. 6877–6881 Titre : Tuning the interaction parameter for the soave-redlich-kwong equation of state using the critical end points Type de document : texte imprimé Auteurs : Yang, Quan, Auteur ; Yigui Li, Auteur ; Shenlin Zhu, Auteur Année de publication : 2009 Article en page(s) : pp. 6877–6881 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Heavy  oil  Catalytic  cracking  Phase  behavior Résumé : In the petroleum industry, to solve problems such as the design of the catalytic cracking of heavy oil, correct knowledge of the phase behavior is essential. As a benchmark where the number of degrees of freedom for binary mixtures is zero, the critical end points can represent the type of phase behavior of the binary mixtures according to van Konynenburg and Scott’s classification scheme (van Konynenburg, P. H. and Scott, R. L. Philos. Trans. R. Soc. London A 1980, 298, 495−540). Calculating the phase behavior of binary mixtures using interaction parameters evaluated by other methods can cause wrong determinations of the type of phase behavior. The critical end points were employed to fit the interaction parameters for binary mixtures in the critical state at high pressure. The molar Gibbs energy of mixing was evaluated to locate the ranges of values for the interaction parameters where exploration for the critical end point would not fail. The phase behavior at the critical end point is rather complex. Based on the Soave−Redlich−Kwong equation of state, the method developed by Heidemann and Khalil for calculating critical properties (Heidemann, R. A. and Khalil, A. M. AIChE J. 1980, 26, 769−780) was used to compute the critical points. A technique for determining the equilibrium phase of the critical point and thus determining the critical end point, which was difficult to evaluate, using the tangent plane criterion was developed. The developed algorithm was found to be rather stable and to converge rather quickly. The critical end points of different nonpolar, polar, and associating binary mixtures were calculated employing this algorithm. According to the calculation results and the experimental data for the critical end points, the interaction parameters were fitted successfully. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900069t [article] Tuning the interaction parameter for the soave-redlich-kwong equation of state using the critical end points [texte imprimé] / Yang, Quan, Auteur ; Yigui Li, Auteur ; Shenlin Zhu, Auteur . - 2009 . - pp. 6877–6881. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 14 (Juillet 2009) . - pp. 6877–6881 Mots-clés : Heavy  oil  Catalytic  cracking  Phase  behavior Résumé : In the petroleum industry, to solve problems such as the design of the catalytic cracking of heavy oil, correct knowledge of the phase behavior is essential. As a benchmark where the number of degrees of freedom for binary mixtures is zero, the critical end points can represent the type of phase behavior of the binary mixtures according to van Konynenburg and Scott’s classification scheme (van Konynenburg, P. H. and Scott, R. L. Philos. Trans. R. Soc. London A 1980, 298, 495−540). Calculating the phase behavior of binary mixtures using interaction parameters evaluated by other methods can cause wrong determinations of the type of phase behavior. The critical end points were employed to fit the interaction parameters for binary mixtures in the critical state at high pressure. The molar Gibbs energy of mixing was evaluated to locate the ranges of values for the interaction parameters where exploration for the critical end point would not fail. The phase behavior at the critical end point is rather complex. Based on the Soave−Redlich−Kwong equation of state, the method developed by Heidemann and Khalil for calculating critical properties (Heidemann, R. A. and Khalil, A. M. AIChE J. 1980, 26, 769−780) was used to compute the critical points. A technique for determining the equilibrium phase of the critical point and thus determining the critical end point, which was difficult to evaluate, using the tangent plane criterion was developed. The developed algorithm was found to be rather stable and to converge rather quickly. The critical end points of different nonpolar, polar, and associating binary mixtures were calculated employing this algorithm. According to the calculation results and the experimental data for the critical end points, the interaction parameters were fitted successfully. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900069t