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Milton Roy Mixing gas-liquid reaction operations

Many chemical reactions are created between a liquid, a gas, and a solid (catalyst). These reactions are classified as exothermic or andothermic. The heat transfer can be a limiting factor for the reaction rate.

  • The gas dispersion in fine bubbles allows for a close contact surface in a gas-liquid, resulting in a faster reaction rate.
  • It has also been noted that the ability of an agitator to make a gas transfer is linked to the power dissipated in the bulk. 

Milton Roy Mixing has developed a large, flexible range of turbines offering a good balance between the dissolved-gas flow rate and the power that must be dissipated within the product.

  • The design of our sparger—an essential component for gas dispersion in a liquid—offers advantages such as ease of cleaning and regularity of gas diffusion.
  • To complete the mixing system, Milton Roy Mixing will provide one or several impellers for the shaft to assure proper renewal of the bulk upon the wall where a heat exchanger is often located, as well as an impeller to hold solids in suspension. 

Milton Roy Mixing hydrogenization operations

These gas-liquid reactions require precision, due to the high temperatures and pressure necessary to conduct them. As the gas is hazardous and costly, it must be contained in a closed and controlled area, and must be completely consumed in the course of the reaction. 

Milton Roy Mixing offers an original, proven self-suction turbine which works as follows:

The gas is injected into the top of the reactor.
The turbine is fixed on a hollow shaft, which includes opening ears in the reactor dome.
During the rotation, the turbines create a depression.
The gas level in the hollow shaft decreases to reach the turbine.
Finally, the gas will make contact with the liquid in the heart of the turbine, where it is sheared into fine bubbles.
The unreacted gas then rises to the surface in order to be sucked through again, until it is exhausted (according to gas pressure).

Main advantages of this process are:

  • A very high mass-transfer coefficient
  • Gas-liquid contact at the heart of the turbine
  • An important heat-transfer coefficient providing transfer of calories
  • No sparger at bottom of the tank (no clogging or plugging)
  • Gas recycling until the expected reaction step and full consumption

Milton Roy Mixing operation: synthesis under pressure

End-product and intermediate bulk-product synthesis have a specific mode of operation amid high pressure and temperature, a variable level of liquid, and several processes including:

  • Heating
  • Dissolving
  • Reaction
  • Homogenization
  • Cooling


To solve the challenges of these processes, Milton Roy Mixing offers agitators fitted with multiple impellers, helping to better manage the operation.

Agitators are equipped with:

  • Variable speed to adjust the mixing intensity at each step
  • A mechanical solution with reliable seal devices (single or double seal with nitrogen counter-pressure and cooling coil)

Maintenance is simple—side removal of the seal eliminates the need to dismantle the mixer, thanks to a specific device built into the guiding support, and all tools are supplied.


Equipment used


The F5 type is used in all operations processed under pressure or within a vacuum, or for mixing hazardous substances. The F5 offers a wide array of options for customization.

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New range of folding blade mixers ideal for Intermediate Bulk Containers

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