One hundred kmol/h of an equimolar mixture of benzene (B), toluene (T), n-hexane (C6), and n-heptane (C7) is to be extracted at 150°C by 300 kmol/h of diethylene glycol (DEG) in a countercurrent, liquid–liquid extractor having five equilibrium stages. Estimate the flow rates and compositions of the extract and raffinate streams by the group method. In mole-fraction units, the distribution coefficients for the hydrocarbon can be assumed constant, with the following values:

Transcribed Image Text:

Component B T C6 C₁ KD;y (solvent phase)/ x(raffinate phase) 0.33 0.29 0.050 0.043