The coexistence curves of {xC₆H₅NO₂+(1-x)CH₃(CH₂)₁₂CH₃} in the critical region

Author： An X. Zhao H. Jiang F. Mao C. Shen W.

ISSN： 0021-9614

Source： Journal of Chemical Thermodynamics, Vol.29, Iss.9, 1997-09, pp. : 1047-1054

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Abstract

Coexistence curves for {xC₆H₅NO₂+(1-x)CH₃(CH₂)₁₂CH₃} have been determined by measurements of refractive index. The critical amplitude B and the critical exponent &bgr; have been deduced from (T, n), (T, x) and (T, φ) curves, where n, x, and φ are refractive index, mole fraction, and volume fraction, respectively. The values of &bgr; are consistent with the theoretical ones. The experimental results have also been analysed to examine Wegner correction terms and the behaviour of the diameter of the coexistence curve in various units over a temperature range of 10 K from the critical temperature. The coexistence curves have been successfully described by a combination of the Wegner equation and the expression for the diameter. The molar mass (M)-dependence of critical volume fraction φ_c may be expressed as (1-φ_c)/φ_c∝M^-r and -r is found to be 0.40.