I’m urgently seeking answers from experts regarding issues with the calculation results of different versions of Pro II
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This post was last edited by zszzsz on 2009-12-17 at 14:06. The differences between the results obtained by following the example problems and those in the reference materials are they caused by different versions? (Note: Same thermodynamic model and same specifications) Separation of 0.1 propanol from 0.9 water. Results from my calculations: SUMMARY OF UNDERWOOD CALCULATIONS MINIMUM REFLUX RATIO 1.60754 FEED CONDITION Q 1.00824 FENSKE MINIMUM TRAYS 3.07454 OPERATING REFLUX RATIO 1.20 * R-MINIMUM TOTAL FEED R/R-MIN M/M-MIN REFLUX DUTY, MM BTU/HR TRAYS TRAY RATIO CONDENSER REBOILER ----- ---- ------- ------- ------ ---------- ---------- 9 2.98 1.100 2.776 1.768 -1.865E+01 2.343E+01 8 2.83 1.150 2.612 1.849 -1.919E+01 2.397E+01 8 2.70 1.200 2.472 1.929 -1.973E+01 2.451E+01 7 2.60 1.250 2.351 2.009 -2.027E+01 2.505E+01 7 2.50 1.300 2.246 2.090 -2.081E+01 2.560E+01 Results provided in the data: MINIMUM REFLUX RATIO 1.91341 FEED CONDITION Q 1.00553 FENSKE MINIMUM TRAYS 3.57154 OPERATING REFLUX RATIO 1.20 * R-MINIMUM TOTAL FEED R/R-MIN M/M-MIN REFLUX DUTY, MM BTU/HR TRAYS TRAY RATIO CONDENSER REBOILER ----- ---- ------- ------- ------ ---------- ---------- 10 5 1.100 2.694 2.105 -1.949E+01 2.427E+01 9 5 1.150 2.529 2.200 -2.009E+01 2.487E+01 9 4 1.200 2.389 2.296 -2.069E+01 2.547E+01 8 4 1.250 2.270 2.392 -2.129E+01 2.607E+01 8 4 1.300 2.167 2.487 -2.189E+01 2.668E+01
What about the experts? Looking forward to answers from experts!
It’s hard to expect complete consistency. It is still better to trust the calculation results of the new version; the examples are only for reference and not absolute truths.