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ProMax Tutorial

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					ProMax Tutorial

  Terry A. Ring
  CH EN 4253
   Process Simulation Software
• Steady State Process           • Dynamic Process
  Simulation                       Simulation
   –   AspenPlus                   – Aspen Dynamics
   –   ProMax                      – CADSim
   –   ChemCad                     – Simulation Solutions, Inc.
   –   Hysis
   –   HySim
   –   ProSim
   –   CADSim
   –   OLI Process Simulator
   –   KemSimp
   –   Chemical Workbench Code
   –   Ascend IV
                       Overview
                 Differences to Aspen
•   Aspen                                  •   ProMax
    – Next Button                              – More Thermo Package Choices
                                               – Fewer units that perform a given
    – Many units that perform a given            function
      function                                     • You choose the Degrees of
         • Degrees of Freedom are chosen             Freedom
           for you                             – Reaction setup is more straight
    – Setup for kinetic reactions are            forward
      tricky                                   – Detailed design of
                                                   • HX
                                                        – Reboilers
                                                        – Condensers
                                                   • Distillation Columns
    – Accounts for particle sizes              – Does not deal with particle sizes
         • Simple block models                 – No Plant Costing
    – Automatic Plant Costing (Icarus)         – Some minor bugs not worked out
                     Steps to Run
• Aspen (Left Hand Bar)              • ProMax
   –   Title                           – Environment
   –   Components                         • Components
   –   Thermopackage                      • Thermopackage
   –   Process Flow Sheet              – Process Flow Sheet
   –   Feed Stream                     – Feed Stream
   –   Unit Specifications             – Unit Specifications
        • Fixed degrees of freedom        • Various degrees of
                                            freedom
   – Run
                                       – Run
   – Results
                                       – Results
   – Report
                                       – Report
               Degrees of Freedom
• Statistical Mechanics –Gasses
    – Gives Heat Capacity of Gasses = NR/2
                        Monatomic   Linear molecules   Non-Linear
                                                       molecules
Position (x, y and z)   3           3                  3
Rotation (x, y and z)   0           2                  3
Vibration               0           3N - 5             3N - 6
Total                   3           3N                 3N
         Degrees of Freedom
• Phase Diagram       • Process Simulation
  – F = C-P+2         • ND= Nvariables-Nequations
     • C=Components
     • P=Phases
                      • Nvariables for each stream
     • 2 = T and P       – Mole fractions
                         – Mole flow rate
                         – Enthalpy (T,P)
                      • Nequations
                         – Overall Component mole
                           balance
                         – Mole fractions add to 1.0
                           for each stream
                         – Enthalpy Balance
               Example-I
• Problem 5.12
• Alternatives in preparing a feed. A
  process under design requires that 100
  lbmol/hr of toluene at 70F and 20 psia be
  brought to 450 F and 75 psia.
• Flow sheets using Peng-Robinson
  – Boil-Superheat-Compress
  – Pump to 75 psi-Boil-Superheat
               Problem -2
• Use Gibbs
                        CO  2 H 2  CH 3OH
  Minimization reactor
  in Aspen to determine CO  H 2  H 2O  C ( s)
  the products of
  reaction at 10 atm and
  200 C.
• Feed equimolar in CO
  and H2
                 Example-4
• Distillation/Flash
• Isopropanol – Water
  – 100 lbmole/hr
    • Flash at 90C
    • Distillation
       – R=2
       – BUR=3

				
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posted:7/23/2012
language:English
pages:9