BT2.SEP

This file was created on 23 Jun'03 0:42 by ChemSep v4.50
( C:\CHEMSEP\BT2.SEP)


INDEX: Input Iteration history Tables Graphs


Input

 Column C:\CHEMSEP\BT2.SEP

 Components:
  Benzene
  Toluene

 Operation:
  Simple Distillation
  Total (Liquid product) Condenser
  Partial (Liquid product) Reboiler
  10 Stages
  Feeds to stages 5

                           |----|
                 |------>-----| |
                 |         |1 | |
              |--|------|  |--|-|
              |  |   |----<-------->-
              |--|---|--|
              |--|---|--|
  ----->----5-|--|---|--|
              |--|---|--|
              |--|---|--|
              |  |---|-----<----|
              |------|--|    |--|-|
                     |--->---------->-
                           10|----|

 Properties:
  DECHEMA K model
  UNIFAC Activity coefficient
  Antoine Vapour pressure
  Excess Enthalpy
   Enthalpy reference state Vapour
   Enthalpy reference temperature 25.00 ( C)
   Formation enthalpies Excluded
   Exergy surroundings temperature 25.00 ( C)

 Reactions:

 Specifications:

  Column pressure
   Condenser pressure 1.115 (bar)
   Top pressure 1.115 (bar)

  Default efficiency = 1.000 (-)

  Feed                                 1 
   Stage                               5 
   Pressure (bar)                  1.115 
   Enthalpy (kJ/kmol)                    
   Vapour fraction (-)            0.0000 
   Temperature ( C)                      
   Component flows (mol/s)      
   Benzene                         5.874 
   Toluene                         5.874 

  Condenser
   Reflux ratio = 2.000 (-)
   Initialization guess: *

  Reboiler
   Bottom product flow rate = 5.874 (mol/s)
   Initialization guess: *

 Solve options:
  Automatic Initialization
  Newton's method
  Flow Step limit 0.5000 (-)
  Temperature Step limit 10.00 ( C)
  Composition Step limit 1.000 (-)
  Accuracy = 0.0001
  Maximum iterations = 30
  Feeds type = Stage below
  User program = CSW

Iteration history

ChemSep (TM) - Flash/Col2 v4.30s
Copyright(c) H.Kooijman and R.Taylor, 1988-2001
Checking data file C:\CHEMSEP\BT2.SEP
 Reading configuration
 Reading component property libraries
 Reading thermodynamic property options
 Reading specifications
 Checking Component Data
  Benzene                                           
  Toluene                                           
 Determining feed conditions
Generating initial flow profiles
Generating initial composition profiles
 Starting Newtons method
Ctrl-Break will terminate execution

      Iteration              Error

         0                   1.2908E+04
         1                   9.6881E+01
         2                   2.1764E-01
Convergence obtained in 2 iterations                         
 Generating equilibrium data
c:/chemsep/bin/go-col2.exe done

Tables

Mass and Energy Balances

 Stream / Apparatus               Mass (mol/s)   Energy (MW)    Exergy (MW)

 Feed 1                            11.75          -0.2899        -1.114    
 Top                               -5.873         0.1479         0.5088    
 Bottom                            -5.874         0.1355         0.5933    
 Condenser Duty                                   -0.5471        -0.09197  
 Reboiler Duty                                    0.5536         0.1235    
                                  ----------- +  ----------- +  ----------- +
 Balance                           -3.958E-05     1.125E-06      0.01939   

 Thermodynamic efficiency = 0.3841    



 Component discrepancies (mol/s)

 Benzene                           -2.141E-05
 Toluene                           -1.905E-05

 Stage Temperature Pressure              Flow rates (mol/s)
          ( C)         (bar)      Liquid     Vapour     Feed     Product

    1 85.24      1.115      11.75                            5.873      L 
    2 87.54      1.115      11.53      17.62                 
    3 90.49      1.115      11.32      17.41                 
    4 93.61      1.115      11.16      17.20                 
    5 96.30      1.115      22.79      17.03      11.75      
    6 98.59      1.115      22.65      16.91                 
    7 101.6      1.115      22.53      16.78                 
    8 104.9      1.115      22.46      16.66                 
    9 108.0      1.115      22.44      16.58                 
   10 110.6      1.115                 16.57                 5.874      L 

 Profile for Toluene

  Stage     Liquid (-)          Vapour (-)          K  (-)

      1     0.07929             0.03190             0.4023    
      2     0.1813              0.07929             0.4373    
      3     0.3028              0.1469              0.4851    
      4     0.4202              0.2264              0.5389    
      5     0.5142              0.3026              0.5886    
      6     0.5891              0.3730              0.6332    
      7     0.6806              0.4730              0.6949    
      8     0.7752              0.5959              0.7688    
      9     0.8579              0.7236              0.8435    
     10     0.9206              0.8357              0.9077    

 Profile for Toluene

  Stage     Liquid (-)          Vapour (-)          K  (-)

      1     0.07929             0.03190             0.4023    
      2     0.1813              0.07929             0.4373    
      3     0.3028              0.1469              0.4851    
      4     0.4202              0.2264              0.5389    
      5     0.5142              0.3026              0.5886    
      6     0.5891              0.3730              0.6332    
      7     0.6806              0.4730              0.6949    
      8     0.7752              0.5959              0.7688    
      9     0.8579              0.7236              0.8435    
     10     0.9206              0.8357              0.9077    

 Stream                     Feed 1      Top         Bottom      

 Stage                      5           1           10          
 Pressure (bar)             1.115       1.115       1.115       
 Vapour fraction (-)        0.0000      0.0000      0.0000      
 Temperature ( C)           95.89       85.24       110.6       
 Enthalpy (kJ/kmol)         -2.468E+04  -2.519E+04  -2.307E+04  
 Entropy (J/kmol/K)         2.353E+05   2.061E+05   2.614E+05   

 Mole flows (mol/s)         
 Benzene                    5.874       5.407       0.4661      
 Toluene                    5.874       0.4657      5.408       

 Total molar flow           11.75       5.873       5.874       

 Mole fractions (-)         
 Benzene                    0.5000      0.9207      0.07936     
 Toluene                    0.5000      0.07929     0.9206      

 Mass flows (kg/s)          
 Benzene                    0.4588      0.4224      0.03641     
 Toluene                    0.5412      0.04291     0.4983      

 Total mass flow            1.0000      0.4653      0.5347      

 Mass fractions (-)         
 Benzene                    0.4588      0.9078      0.06810     
 Toluene                    0.5412      0.09222     0.9319      

Graphs

Liquid compositions

Vapor compositions

K-values

Temperatures

Pressures

Flow profiles

Enthalpies

Stripping factors

Key-ratios

Relative volatilities

McCabe-Thiele