Post Mixing Optimization and Solutions


Show me an engineer that doesn't like to do what-if and I'll show you ...

What better way to end your consulting service with Post Mixing than to have a computer program tailor-made to your project? Together with the Mixer/Reactor Inventory, this program estimates mixing times, gas dispersion quality, degree of solids suspension, mass transfer characteristics and more. 

These programs are tailor-made to your process. Most likely the program will be in Excel utilizing VBA (Visual Basic for Applications) or Quattro Pro utilizing PerfectScript or VBA to automate calculations and usability. Together with the Mixer/Reactor Inventory, you can quickly make comparisons from one reactor to another, or use it to aide in scale-up, scale-down, or plant transfer. You can also use this to look at just one reactor and optimize its performance.

Because the program comes in spreadsheet format, it allows you to do what-ifs long after Post Mixing has left your company.

The program comes with many tried and true correlations from the mixing literature to get you into the ballpark. Use it as is, to get a feeling of the importance of mixing. Modify the inputs, to tailor the program to your processes and see how your processes are affected by mixing. The program allows you to modify essentially every correlation to make this generic program specific to just your processes. Then use the program to optimize your process. The program can also include solver buttons to streamline those what-ifs you do most frequently.

Documentation is in the program by way of comments and online help.

Key Benefits

  • Parameters are organized in sections
    • Reactor Selector
    • Input buttons
    • Tank/Reactor characteristics
    • Impeller factors
    • Mixing factors
    • Mass transfer parameters
    • Operational inputs and outputs
    • Process calculations
    • Impeller details for up to 6 impellers (standard)
    • Automated solver buttons
    • Automated scale-down assistance selector
  • A separate sheet holds all of the important impeller parameters
  • On-line glossary with hyperlinks for quickly finding what you need
  • Preinstalled graphs
  • One-button generation of a scaled reactor drawing. This handy little drawing is to scale. It can quickly alert you to something that might be obviously wrong. The problem may be real, or it may just be that the input was wrong. Red colored items warn you of possible problems, such as missing data, or that the red item is outside the range of typical situations. It also gives you a visual idea of how high the fluid is relative to the upper impeller.
  • Convenient drop-down Input Windows (click on pictures for a better view). After pushing an input button, the input window appears. Because of the enormous amount of information required to properly analyze a mixing problem, the inputs are grouped and organized like tabs in a filing cabinet. 
    • Program Inputs and Defaults Operational Inputs: Fluid weight, volume, density, Newtonian or non-Newtonian viscosity, gas hold-up model selector, and more are inputs here. The buttons and check marks allow you to select your inputs. The rest will be calculated for you.

    • Impeller Inputs: Specifies parameters for each individual impeller on the shaft based on the uniqueness of its position. These are not Np, Nq, etc, which are found on the Impeller Sheet.
    • Mixing Inputs: Specifies parameters dealing with the mixing, such as degree of mixing, inlet pipe positions, IEF-factors, etc.
    • Mass Transfer Inputs Mass Transfer Inputs: Specifies the parameters needed to solve mass transfer calculations. Currently there is only a module for gas-liquid mass transfer. If you use different equations than those shown here, they can be easily swapped out. Other modules for solid-liquid mass transfer, liquid-liquid mass transfer, and heat transfer can be easily set-up.

    • Program Defaults: Want to find out quickly which reactor in your plant/company will do the best for a particular process? Set the defaults of your process and apply them to all of your reactors. In an instant you can tell which reactor is going to give you the best results by looking at the preinstalled graph comparisons.
    • Tank Inputs: A place to lock and unlock access to your inventory. You don't want anyone to make changes here, unless it is to update the dimensions of the reactor. That can be necessary after someone noticed an error in the data, or after a retrofit or reactor modification took place.
    • Tank Calibration Tank Calibration: A nice and handy place for the experimental data that determines your no-load power draw. The data here is used to compare your measured power during a reaction and the calculated impeller power from the program.

    • Case Study: This is your case study maintenance center. So you have spent all this time doing "what-ifs". This window allows you to save your data without overwriting the original. By doing so, it also updates the Reactor Selector, so that you can come back to this case study as often as you wish.

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Last modified: February, 2013
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