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Unformatted text preview: VLE for NONIDEAL MIXTURES Low P. When Then some activity coefficient is >1 and viceversa. These are Positive and negative deviations from Raoult’s law To locate the extremum we set Recall (what equations is this?) Now, it can be proven that 0 (Exercise 9.18) Substituting, we get: which leads to and together with x1+x2=1 and y1+y2=1, we get AZEOTROPE!!!! And Ignore the rest of the chapter...
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 Spring '08
 staff
 Chemical Engineering, Thermodynamics, Randall, activity coefficient method

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