Question 6, Professional Case, Afternoon, 2016
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A distillation column is used to treat a benzene-toluene mixture containing 50% benzene by mole fraction; the processing rate is 100 Kmol/h, and the top product is required to contain at least 98% benzene. The upward gas flow rate in the stripping section is 120 Kmol/h, the reflux ratio is R = 1.3Rmin, feeding is at the bubble point, and the equilibrium relationship is y = 1.425x. What is the yield of the product at the top of the tower (kmol/h)? A, 30.45 B 36.80 C 45.45 D 52.17 How is Rmin calculated for this question? There is no relative volatility. How is the equilibrium equation used? Seeking advice from experts!
Fed by bubbling, xq=xF=0.5, yq=1.425xq=0.7125; Rmin=xD-yq/yq-xq=0.98-0.7125/0.7125-0.5=1.259; R=1.3Rmin=1.636; D=V/(R+1)=120/2.636=45.52.
I came to check it only after the exam~~ Thanks, let’s continue next year haha