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8564945 
Meetings & Symposia 
MUTUAL DIFFUSION COEFFICIENTS NEAR LIQUID-LIQUID BINODAL CURVES 
Rowley, RL; Clark, WM 
1985 
AIChE 
Houston, TX, USA 
1985 Spring National Meeting and Petro Expo '85 - American Institute of Chemical Engineers. 
English 
A Gouy interferometer and a flowing-junction, boundary-sharpening cell have been used to obtain the composition and temperature dependence of the mutual diffusion coefficient near the critical solution temperature of the methanol - hexane system. The results have been fitted to a smoothing equation which allows extrapolation to zero diffusivity characteristic of the spinodal curve. In particular, NRTL parameters were fitted as a function of temperature to measured coexistence curve data and then used to predict spinodal compositions; the results differ appreciably from the experimentally derived values. Additionally, a temperature-jump cell was used to measure the diffusion coefficient as a function of temperature along the critical composition line and critical exponent of 0. 685 was obtained.