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DIP_07

DIP_07.ppt. Practical exercises Distillation: changing the feed stream vapor fraction. Using two levels of pressure to separate azeotropic mixtures. Exercise 1. Perform a sensitivity analysis in a distillation tower to study the influence of the ‘feed vapor fraction‘ on tower PERFORMANCE.

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DIP_07

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  1. DIP_07.ppt • Practical exercises • Distillation: changing the feed stream vapor fraction. • Using two levels of pressure to separate azeotropic mixtures.

  2. Exercise 1 Perform a sensitivity analysis in a distillation tower to study the influence of the ‘feed vapor fraction‘ on tower PERFORMANCE. • Components: Orto-Xylene+ Para-Xylene • Feed: 100 kmol/h (50%MOL), 1 bar y 20ºC • Reflux ratio: 10% higher than minimum • Components recovery: 99% • Properties: NRTL • Evaluate the influence of the feed vapor fraction on the following variables: • Reflux ratio (RR) • Number of theoretical stages in stripping and rectifying sections. • Duties (Condenser – Boiler – Preheater)

  3. 14 13.5 RR 13 12.5 0 0.2 0.4 0.6 0.8 1 Feed vapor fraction Sensitivity: Reflux ratio

  4. 70 Rectifying Striping 65 Nt 60 0 0.2 0.4 0.6 0.8 1 Feed vapor fraction Sensitivity: Number of theoretical stages (Nt)

  5. 7 6.5 Energy (MMkcal/h) 6 5.5 0 0.2 0.4 0.6 0.8 1 Feed vapor fraction Sensitivity : Duties QB + QPH QC QB

  6. ETHANOL + WATER P = 10 atm T P = 1 atm 0.818 0.895 x , y Exercise 2 Design a process for the recovery of absolute alcohol by operating two distillation towers at 1 and 10 atm. Components: ETHANOL + WATER Feed: 50 kmol/h (70%MOL de ETHANOL), 1 bar saturated liquid (boiling point). Properties: NRTL Final products purity: 99.9%mol

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