Table IV. Isothermal Enthalpy Departure of Liquid Methane
third parameter, the capability of its overall representatior, of the liquid state is only compatible with or even inferior to the generalized two-parameter method, with the exception of highly polar compounds. The Fuller equation is more complicated and the justification of its use for nonpolar compounds appears to be questionable.
(H*- H),
Temp, OF
Pressure, psia
-200
200,600,1000,1500,2000 200,600,1000,1500,2000 200,600,1000,1500,2000 200,600,1000,1500,2000 200,600,1000,1500,2000 Overall av
-220 --240 -260 -280
av abs dev, % Hamam Fuller e t al. 1.24
0.80
1.69 2.36 2.69
0.60
L i t e r a t u r e Cited
1.11
American Petroleum Institute. “Technical Data Book-Petroleum Refining”, 2nd ed, Washington, D.C.. 1971. Canjar, L. N.,Manning, F. S., “Thermodynamic Properties and Reduced Correlations for Gases”, Gulf Publishing Co., 1967. Chang, S.D., Lu, B. C.-Y., Can. J. Chem. Eng., 48, 261 (1970). Chang, S. D., Lu, B. C.-Y., Adv. Cryog. Eng.. 17, 255 (1972). Chaudron, J.. Asselineau, L., Renon, H. Chem. Eng. Sci., 28, 839 (1973.1. Fuller, G. G., Ind. Eng. Chem., Fundam., 15, 254 (1976). Goodwin, R. D., Prydz, R. NBS J. Res., 75A, 81 (1972). Hamam, S.E. M., Chung, W. K.,Elshayal, I. M.,Lu, B. C.-Y., Ind. Eng. Chern., Process Des. Dev., 16, 51 (1977). Jones, M. L., Jr., Mage. D. T., Faulkner, R. C., Jr., Katz, D. L., Chem. Eng. Progr. Symp. Ser. No. 44, 59, 61 (1963). Lu. B. C.-Y., Chang, S.-D., Elshayal. I. M., Yu, P., Gravelle, D.,Poon, D. P.L.. Proceedings, First International Conference on Calorimetry and Thermodynamics, pp 755-766, Warsaw, 1969. Redlich, O., Ind. Eng. Chem., Fundam., 14, 257 (1975). Soave, G., Chem. Eng. Sci., 27, 1197 (1972).
3.03 2.20
1.64 2.99 1.43
two-parameter method. The difference between the two methods is about 0.1%. In addition, isothermal enthalpy departures of pure liquid methane from ideal gas behavior, (H* - H), were calculated a t five temperatures and compared with the data reported by Jones et al. (1963). A summary of the calculated results is given in Table IV. The results obtained by the Fuller method are less satisfactory than the generalized two-parameter method. Although the Fuller modification satisfies the horizontal inflection condition a t the critical point by the addition of a
Department of Chemical Engineering University of Ottawa Ottawa, Ontario, Canada K l N 6N5
W. K. Chung S. E. M. Hamam B. C.-Y. Lu*
CORRECTIONS In the article, “An Empirical Correlation among Azeotropic Data,” by K. M. Seymour, R. H. Carmichael, J. Carter, J. Ely, E. Isaacs, J. King, R. Naylor, and T. Northern [Ind.Eng. Chem., Fundam., 16, 200 (1977)], the abscissa of Figure 2 should be labeled f(p)At degrees instead of At degrees.
In the article, “A New Vapor Pressure Equation and Its Application to Normal Alkanes,” by M. G6mez-Nieto and G. Thodos [Ind.Eng. Chem., Fundam., 16,254 (1977)],the last term in eq 9 should be 3.6529 e5473/s3.5
Ind. Eng. Chem., Fundam., Vol. 16, No. 4, 1977
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