Question: Diethylene glycol (DEG) is used as a solvent in the UDEX liquid-liquid extraction process to separate paraffins from aromatics. If 280 lbmol/h of 42.86 mol%

Diethylene glycol (DEG) is used as a solvent in the UDEX liquid-liquid extraction process to separate paraffins from aromatics. If 280 lbmol/h of 42.86 mol% n-hexane, 28.57 mol% n-heptane, 17.86 mol% benzene, and 10.71 mol% toluene is contacted with 500 lbmol/h of 90 mol% aqueous DEG at 325°F and 300 psia, calculate, using a simulation computer program and the UNIFAC L/L method for estimating liquid-phase activity coefficients, the flow rates and molar compositions of the resulting two liquid phases. Is DEG more selective for the paraffins or the aromatics?

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