Consider a mixture of 40% (mole) toluene (T) and 60% n-butanol (B) at 101.3 kPa. The mixture can be assumed to form an ideal gas mixture and a non- ideal liquid mixture. The K-values can be calculated from modified Raoults law. The activity coefficients are given by the van Laar equation:

lnTlnB=[1+1.3060.855xBxT]20.855=[1+0.8551.306xTxB]21.306 The vapor pressure is given by Antoine Equation lnP1sat=9.3935T53.673096.52lnP2sat=10.5958T94.433137.02 Where T is in K and P is in bar. a) Find the bubble point and dew point temperature of a mixture. (Ans: Tdew= 382.57K) b) If this mixture is flashed midway between the bubble and dew points and 101.3kPa, what fraction is vaporized (V/F), and what are the phase compositions? ( Ans: xT=0.3 )