CH1012
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14
FRACTIONAL DISTILLATION
ptotal = pA + pB = poA xA   + poB xB
• with ideal behaviour the
presence of the two
liquids lowers the V.P.
of each component
• the vapour has a higher
mole fraction of the more
volatile solution component.
benzene(95torr):toluene(28torr)
liquid 50:50      vapour 77:23
     eg. petroleum refining