CHEN 3101 Lecture Notes - Lecture 16: Vaporization, Activity Coefficient, Ideal Solution
25 Dec 2014
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Liquid-liquid equilibrium (sandler 11-2 contains most of today"s lecture) (wrapping up activity coefficient vle sandler 10-2) Generally neither phase is pure (there is always some solubility) Effect of pressure on ll eqbm is weak focus on t-dependence. If mixh > 0, solubility increases with increasing t. 2 compositions @ end of tie line = the ones there upper consolute point. If mixh < 0, solubility decreases with increasing t. Chen thermo page 2 lower consolute point there are some materials that don"t mix w/in some certain t range but do mix above and below it. Vaporization or freezing may prevent mixing here positive enthalpy of mixing. @ this t, have l, l, and v coexistence. Pressure dependence: mu"s in liquid depend weakly on p. @ fixed t if you drop p low enough, it will vaporize but we work high enough. If we use pure liquid standard states & activities,
