A compressed liquid mixture of 42 mol percent n-hexane (1) and58 mol percent ethane (2) is to be fed to a flash tank where the pressure is reduced and a liquid and vapor stream separated. The flashing operation will be carried out at 32 °C. The liquid product should have a composition of 81.7 mol percent n-hexane to meet the requirement of the succeeding unit.
Data: n-hexane ethane
Molar liquid volume(cm3/mol) 132.0 45.7
Solubility parameter(J/cm3)1/2 14.9 19.4
Vapor pressure(bar) 0.284 46.195