week 7 305-2

week 7 305-2 - Retrofit Application Subcooled Reflux L f L...

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Unformatted text preview: Retrofit Application Subcooled Reflux ' L f L h H h h C C reflux dliq sat = − − = ( ) L f L T T C C C reflux BP PL = − = λ ( ) ( ) RR f RR f V L V L C C + + + = = 1 1 1 2 1 5 Example A distillation column with a total condenser and a partial reboiler is separating an ethanol-water mixture. The feed is 20 M% ethanol, feed rate is 1000 kmoles/hr, and the feed temperature is 80 F. A distillate composition of 80 M% ethanol and a bottoms composition of 2 M% ethanol are desired. The external reflux ratio is 5/3. The reflux is returned as a saturated liquid and CMO can be assumed. Find the optimum feed plate location and the total number of equilibrium stages required. Pressure is 1 atm. ChE 305 Example 4-3 Q C D= 9336.738 kg/hr H V = 280 kcal/kg 230.7692 kmol/hr MW V= 615.384615 x D = 0.910942 wt fract EtOH 46.07 0.8 mol fract Water 18.016 h D = 60 kcal/kg RR= 1.666667 L= 384.6154 F= 23626.8 kg/hr L/V= 0.625 y intercept 0.3 1000 kmol/hr T F = 26.66667 °C P= 1 atm Z= 0.389981 wt fract q= 1.13253 0.2 mol fract 1517.146 h F = 15 kcal/kg 747.9147 80 ° F 2.028501 y intercept-0.02057 H= 485 Feed Line h= 70 slope= 8.545455 y intercept -1.509091 Q R B= 14290.06 kg/hr 769.2308 Kmol/hr x B = 0.049599 wt fract 0.02 mol fract h B = 98 kcal/kg Q C =-5477553 kcal/hr Q R = 7083781.6 kcal/hr = L = V = V L Analytical Stage-by-stage Calculations Matrix Method Excel Method Analytical Stage-by-Stage Calculation Heat of Vaporization Comp ∆H MW ∆H kJ/mole g/mole kJ/g pentane 25.77 72.15 0.357 hexane 28.85 86.17 0.335 heptane 31.69 100.20 0.316 octane 34.67 114.22 0.304 Average 30.25 0.328 ∆ 8.90 0.054 ∆/aver, % 29.43 16.36 Constant α ( ) equation m Equilibriu 1 ∑ = − −...
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This note was uploaded on 11/07/2011 for the course CHE 305 taught by Professor Rowell during the Fall '09 term at Drexel.

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week 7 305-2 - Retrofit Application Subcooled Reflux L f L...

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