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DIP_09

DIP_09.ppt. Extractive Distillation Balance PFD Report Heat/Work streams Heat Exchangers Stream properties. Balance. Extraction distillation of the mixture ETOH + WATER (ETGL) using ethyleneglycol (ETGL) as solvent. Property method: NRTL

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DIP_09

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  1. DIP_09.ppt • Extractive Distillation • Balance • PFD • Report • Heat/Work streams • Heat Exchangers • Stream properties

  2. Balance Extraction distillation of the mixture ETOH + WATER (ETGL) using ethyleneglycol (ETGL) as solvent. • Property method: NRTL • Stream 1: 20ºC, 1bar, 60 kmol-ETOH/h, 40 kmol-WATER/h • Stream 2: boiling point, 1 bar, 30 kmol-ETGL/h • Column D-110: 40 stages, RR=1.8; stream 1 -> stage 35, stream2 -> stage 4. • Column D-120: 99.9% recovery. • Results forms: flows and mole fractions.

  3. /Setup /Report Options: Stream Fraction basis, Mole ON • Components: ETOH, WATER, ETGLICOL • /Properties /Specifications: Global Base method NRTL • Stream 1: 20ºC, 1bar, 60 kmol-ETOH/h, 40 kmol-WATER/h • Stream2: V=0, 1 bar, 30 kmol-ETGL/h • Column D110: RADFRAC; Nt=40, Convergence=Azeotropic, D=60 kmol/h, RR=1.8; stream 1 -> stage 35, stream2 ->etapa 4, P=1 bar. • Column D120: DSTWU; RR=-1.1, LK: WATER 0.999, HK: ETGL 0.001, P=1 bar. DestExtrac_01.apw

  4. Stream 6 must be recycled to stream 2. The software doesn’t allow direct specifications for intermediate streams (stream 7). A Design Specification, a Calculator block or a Balance block must be used to calculate the make-up stream (stream 2) .

  5. Modify the PDF • Balance block: • /Flowsheeting Options /Balance /New: B-1 /Flowsheeting Options /Balance /B-1: Equations /Flowsheeting Options /Balance /B-1: Calculate DestExtrac_02.apw

  6. Results: Control Panel:

  7. PFD • /View /PFD Mode (F12) • [Right-click] /Page Brake Preview (F2) • [Right-click] /Reset Page Breaks (Shift+F2) • Streams table: /Results Summary /Streams [Stream Table] (NOTE: to view the table activate the Global Data option: Menu View: Clobal Data ON) • Move streams, add blocks, etc... : changes are not incorporated to simulation, only to drawing. • /View /Reset PFD mode (Shift+F12) • File /Page Setup: split the drawing in multiple pages.

  8. Report • Contents: /Data /Setup /Report Options • Generate: /File /Export: TYPE=Report Files (*.rep) • View with Notepad or Microsoft Word.

  9. Compare Report extension after adding Property options: ‘All physical property parameter used (in SI units)’ and ‘Property parameters’ descriptions, equations and source of data’. • From 14 to 55 pages!!

  10. Also the interface may be used to see the value of parameters. • /Tools /Retrive Parameter Results • Results in /Properties /Parameters /Results

  11. Heat/Work streams Heat from D-110 condenser may be used to preheat feed stream. • Modify the PFD: add heater E-130, stream 8 and heat stream Q-E130 • Heater E-130: P=0.

  12. The energy balance is correct, but the stream 8 is heated up to 348ºC, when the condenser operates at 78ºC. Caution with thermal levels. DestExtrac_03.apw

  13. Cool the liquid distillate stream from D-110 and use that heat to preheat the feed stream. • Modify the PFD: add heater E-130H. Change Q-E130 source to the new heater. • E-130H: P=0 and T=40ºC • Run

  14. 0.076 106 kcal/h 78ºC 40ºC 20ºC 49.3ºC DestExtrac_04.apw

  15. Cool now the liquid water product stream and use the heat to preheat the feed stream again. • Add heaters E-140C and E-140H. Add the stream Q-E-140, from E-140H to E-140C. • May stream 5 be cooled down to 40ºC?

  16. E-140C: P=0 • E-140H: P=0, T=59.3ºC (the cold stream, 8, is at 49.3ºC, then, assuming a minimum ΔT=10ºC, the maximum cooling in stream 11 will be 59.3ºC). 49.3ºC 60.0ºC 98.7ºC 59.3ºC 0.029 106 kcal/h DestExtrac_05.apw

  17. Heat Exchangers The last step is to replace two Heaters for a heat exchanger (HeatX). Although coefficients may be calculated according to geometry, a rough estimate will be better used. Modify the PFD: exchange Heaters E-140C and E-140H by Heatx E-140.

  18. Speficify minimun ΔTmín= 10ºC at hot stream outlet. Results.... DestExtrac_06.apw

  19. Stream properties 1. Select a stream 2. /Tools /Analysis /Stream 3. Point 4. Mole, Thermodynamic Properties Go

  20. Another example .... 3. Bubble/Dew Go

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