A compressed liquid feed stream containing an equimolar mixture of n-pentane and n-hexane fl ows into a fl ash unit as shown in Figure E8.3 at fl ow rate F. At steady state, 33.3% of the feed stream is vaporized and leaves the drum as a vapor stream with fl ow rate V. The rest leaves as liquid with fl ow rate L. If the fl ash temperature is 20°C, what is the pressure required? What are the composition of the liquid and vapor exit streams?

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C5H12(a) C6H14(b) Xa,feed = 0.5 Feed, F T = 20C Vapor, V Ya Flash tank V Xa Liquid, L Figure E8.3 Flash vaporization of an n-pentane and n-hexane feed stream.