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Digitale Medien

Ternary liquid diffusion coefficients near plait points (1985)

Clark, W. M. ; Rowley, R. L.

Springer

International journal of thermophysics 6 (1985), S. 631-642

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ISSN: 1572-9567

Schlagwort(e): critical exponents ; diffusion coefficients ; Gouy interferometry ; plait points ; ternary liquid systems

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract Mutual diffusion coefficients were measured as a function of temperature above the 30°C plait point of the water + 2-propanol + cyclohexane system using a Gouy interferometer and a new temperature-jump procedure. The four independent diffusion coefficients were found to decrease rapidly along the constant plait-point line as the temperature approached the consolute or plait temperature. Effective critical exponents were found to be 0.55 for the individual diffusion coefficients and 1.31 for the determinant of the diffusion coefficient matrix. The measured diffusion coefficients satisfy all stability requirements, although cross diffusion coefficients were found to be as large as main diffusion coefficients and a negative value was obtained for the water main diffusion coefficient in the component representation utilized in this work.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00500335

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Digitale Medien

The mutual diffusion coefficient of methanol-n-hexane near the consolute point (1986)

Clark, W. M. ; Rowley, R. L.

Hoboken, NJ : Wiley-Blackwell

AIChE Journal 32 (1986), S. 1125-1131

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ISSN: 0001-1541

Schlagwort(e): Chemistry ; Chemical Engineering

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung

Notizen: The composition and temperature dependence of the mutual diffusion coefficient near the liquid-liquid critical point of methanol-n-hexane mixtures has been determined by Gouy interferometry. The critical exponent was found to be 0.685. Constant-temperature extrapolation to zero diffusivity located the spinodal curve. Spinodal loci calculated from the NRTL model are inconsistent with the experimentally determined values.

Zusätzliches Material: 5 Ill.