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1 1 . 6 - 3 . Minimum Reflux and Theoretical Number of Trays. A feed of ethanol - water containing 6 0 w t

11.6-3. Minimum Reflux and Theoretical Number of Trays. A feed of ethanol-water containing 60wt% ethanol is to be distilled at 101.32kPa pressure to give a distillate containing 85wt% ethanol and a bottoms containing 2wt% ethanol. The feed rate is 10000kgh and its enthalpy is 116.3kJkg(50btulbm). Use consistent units of kgh, weight fraction, and kJkg.
(a) Calculate the amount of distillate and bottoms.
(b) Determine the minimum reflux ratio using enthalpy-concentration data from Appendix A.3.
(c) Using 2.0 times the minimum reflux ratio, determine the theoretical number of trays needed.
(d) Calculate the condenser and reboiler heat loads.
(e) Determine the minimum number of theoretical plates at total reflux.
Ans. (b)Rm=0.373
(c)4.4 theoretical trays plus reboiler
(d)qc=3634kW,qR=4096kW
(e)2.8 theoretical trays plus reboiler
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