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Received February 24, 2005
Accepted August 12, 2005
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On the information and methods for calculation of Sanchez-Lacombe and group-contribution lattice-fluid equations of state
1Mathematics Research Group, School of Science, Beijing Jiaotong University, Beijing, 100044, China 2State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Box35, Beijing, 100029, China
leizhg@mail.buct.edu.cn
Korean Journal of Chemical Engineering, January 2006, 23(1), 102-107(6), 10.1007/BF02705699
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Abstract
The algorithms for calculation of densities from Sanchez-Lacombe (S-L) and group-contribution latticefluid (GCLF) equations of state have been put forward, respectively. From the S-L equation of state the relationship between the equation characteristic parameters and critical properties was deduced, and the influence of molecular weight of the polymers on critical properties was investigated. However, for the GCLF equation of state, it was surprising to find that there as many as four roots were found at a saturation temperature and pressure for gases, while still two roots above the critical temperature. For polymers, only two roots could be found. So the formerly accepted consistency between the magnitude of the density and vapor or liquid phase is not applicable yet. A way about how to identify the root and corresponding phase was suggested.
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References
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Garg A, Gulari E, Manke CW, Macromolecules, 27(20), 5643 (1994)
High MS, Danner RP, AIChE J., 36, 1625 (1990)
Lee BC, Danner RP, AIChE J., 42(3), 837 (1996)
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Ko MS, Na S, Cho J, Kim H, Korean J. Chem. Eng., 19(6), 996 (2002)
Lei Z, Li C, Chen B, Korean J. Chem. Eng., 20(6), 1077 (2003)
Lei ZG, Li CY, Chen BH, Sep. Purif. Rev., 32, 121 (2003)
Lei ZG, Chen BH, Ding ZW, Special distillation processes, Elsevier, Amsterdam, 1 (2005)
Li JW, Lei ZG, Ding ZW, Li CY, Chen BH, Sep. Purif. Rev., 34, 87 (2005)
Peng CJ, Liu HL, Hu Y, Chem. Eng. Sci., 56(24), 6967 (2001)
Poling BE, Prausnitz JM, O'connell JP, The properties of gases and liquids, 6th Edition, McGraw-Hill, New York (2001)
Sanchez IC, Lacombe RH, J. Phys. Chem., 80, 2352 (1976)
Sanchez IC, Lacombe RH, Macromolecules, 11, 1145 (1978)
Serbanovic SP, Grguric IR, Kijevcanin MLJ, Tasic AZ, Djordjevic BD, Korean J. Chem. Eng., 21(4), 858 (2004)
