ISSN:
1572-9567
Keywords:
aqueous systems
;
alcohol
;
cloud points
;
phase equilibria
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract Cloud point measurements are presented for the ternary mixture of tertiary butyl alcohol (tBA), secondary butyl alcohol (sBA), and water. At a zero tBA concentration the system displays a large immiscibility gap, but with an increasing proportion of tBA, the gap pinches off at a critical double point to a closed loop and a lower gap, then the loop shrinks and disappears at a hypercritical point, leaving only the lower gap. This behavior is shown to be semiquantitatively similar to the behavior of sBA/water with increasing pressure. If a pseudobinary assumption is made, the shape of the cloud-point curves can be shown to be qualitatively similar to coexistence curves in binary mixtures, with an exponent of β ≃ 1/3. Near the critical double point this exponents appears to double.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00503237
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