This means that you don't have any extra major factors to make the two compounds want to separate from each other. The chemical composition is very similar (both alkanes, only 1 CH2 different), and so the activity coefficient is close to 1, meaning close to ideal mixture behavior. The boiling points are significantly different (-1☌ butane vs -43☌ propane), and this allows for an ok separation with the first stage This is your most reliable way of knowing for sure if they will separate. View Notes - HW1 from CHEN 415 at American University of Beirut. If you look at the Txy diagram at a given pressure and choose a temperature, the maximum separation you can get would separate the two by about 0.3-0.4 in mole fraction (AKA 0.3 x1 vs 0.7 x2 kind of thing). You can get significant separation in one stage, but it would be insufficient for most purifying purposes. Use sliders to change the pressure and temperature a green line connects these two points. Select one of three hydrocarbons: methane, propane or -decane. Defining effectively as getting above 90% purity (though in practice you will want upwards of 95%, even 99% or above), one stage is insufficient. This Demonstration applies a DePriester chart, a set of nomograms to find the vapor-liquid equilibrium ratio (the gas phase mole fraction divided by the liquid phase mole fraction, known as the -value) for a series of hydrocarbons.
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