Post Mixing Optimization and Solutions, LLC
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About: Tom Post

Mixing Course

This course is given in conjunction with the Professional Development Centre at the University of Toronto.  The next course will be posted in News . Hyperlinks will bring you to the appropriate page under Mixing

Fluid Mixing: Improving Product Yield, Throughput & Quality by Optimizing Mixing in Reactors

Course Length:

3 Day Seminar: (e.g. 14-21 hours). The course has been typically 2.5 days. I leave the final 0.5 day for subjects of interest and those who don't want to stay for that are welcome to leave. I call this session "Chalk Talk" and we typically discuss anything of interest. It is time for the audience to try and put me on the spot!

Course Overview:

Course focus - Fluid mixing is rarely taught at any level in any school. Perfect mixing is always assumed. This course focuses on imperfect mixing and the pitfalls of neglecting the influence of mixing on chemical reactions. Introduction to the basics and in-depth coverage of topics of interest, such as multi-phase mixing and scale-up.

The course is broken down into 12 chapters spread over 3 days. It is presented in the form of PowerPoint presentations. Concepts are reinforced with quizzes. Some handouts are given and recommendations to books in the field.

Intended Audience:

Positions: Chemists, Biochemists, Chemical Engineers, Technicians, Plant Operators

Work positions: Chemical Development Group, Pilot Plant Operations, Process Optimization Group

Educational background: Experience in the chemical and biochemical industry. Most participants have college degrees, but the math and physical concepts are presented on a basic level.

Industries: Bulk Chemical, Pharmaceutical, Fine Chemicals, Specialty Chemicals, Cosmetics, Tank Manufactures, Mixer Manufactures, Fermentation Equipment Suppliers, Consultants, Engineering Companies

Prerequisite: A keen interest in improving the processes at your company or in having a better fundamental understanding of the role that mixing plays.

Course Outline:


  • Introduction - Examples of mixing in a multitude of processes
  • Mixing Basics - Fundamentals, General Concepts, Terminology, Pipes, Jets, Mixers
  • Quantitative Mixing - How is mixing quantified? - Flow Characterization, Shear and Turbulence
  • Power Correlations - Power Number, Effect of Baffles and Impeller Position, Effect of Number of Impellers
  • Blending of a Single Phase - Effect of Density and Viscosity Differences
  • Single Phase Reactions - Mixing Time Correlations, Degree of Mixing, Examples


  • Solids Suspension - Suspension Characteristics, Effect of Solid Density, Concentration, Particle Size
  • Solid-Liquid Mass Transfer - Effect of Energy Intensity and Suspension Characteristics
  • Liquid-Liquid Mixing and Mass Transfer - Solvent Extraction, Dispersions, Emulsions
  • Gas-Liquid Mixing - Dispersion Characteristics, Mass Transfer, Optimum Equipment


  • Heat Transfer in Agitated Tanks - Jacket, Coils, Plates
  • High Viscosity Blending - Anchors and Helical Impellers, Others
  • Scale-up: Blending, Solids Suspension, Gas-Liquid Mass Transfer
  • Chalk Talk: Discussion of Processes of Interest from the Audience

Course Notes:

A hard copy of all power-point slides is given to each participant on Day 1.

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Last modified: June 2013