Custom gasification plates for injecting gas into liquid systems.

High-efficiency gas-liquid contacting with Kady rotor-stator mills and purpose-designed gasification plates

Many industrial processes require the controlled injection of gas into a liquid phase—whether for aeration, oxygenation, hydrogenation, carbonation, sparging of inert gas, or reactive gas-liquid mass transfer. Conventional spargers, dip pipes, and static mixers often produce large bubbles with limited interfacial area, resulting in low mass-transfer rates, incomplete dissolution, and inefficient gas utilization. When high viscosity, high solids content, or rapid dispersion is also required, these limitations become even more pronounced.

Kady International addresses these challenges with custom-engineered gasification plates integrated into high-speed rotor-stator dispersion mills. The combination of intensive mechanical shear and precisely directed gas injection creates extremely fine bubbles, maximizes interfacial area, and delivers superior gas-liquid contacting performance in a single intensive mixing zone.

Technical Requirements of Effective Gas Injection

Efficient gas-liquid mass transfer depends on several interrelated factors:

• Bubble size and interfacial area – Smaller bubbles provide higher surface area per unit volume of gas and longer residence times before rising to the surface.
• Local turbulence and shear – High energy dissipation rates break large bubbles into micro-bubbles and continuously renew the gas-liquid interface.
• Dispersion uniformity – Gas must be distributed throughout the vessel rather than rising in a localized plume.
• Compatibility with process rheology – Systems containing high solids, high viscosity, or non-Newtonian fluids require energy levels that conventional spargers cannot supply.
• Control of gas hold-up and foaming – The injection method must allow regulation of gas volume fraction while minimizing unwanted foam or entrainment.

Standard open-pipe spargers or sintered metal elements generate relatively large bubbles and rely primarily on buoyancy-driven rise. In viscous or solids-laden liquids their effectiveness drops sharply. Mechanical agitators can improve dispersion, but without a properly designed gas introduction system the benefits remain limited.

How Kady Gasification Plates Work

A Kady gasification plate is a custom-machined component that introduces gas directly into the high-shear zone of the rotor-stator head. Depending on the process requirements, the plate may be configured as:

• A perforated or slotted plate mounted immediately below or around the stator
• A multi-orifice distributor integrated into the stator housing
• A specialized gas-inlet ring or manifold that feeds gas into the rotor-stator gap
• A combination of bottom-entry gas injection with controlled recirculation paths

When the rotor spins at high tip speed (typically 5,000–10,000+ ft/min), the following mechanisms occur simultaneously:

• Primary bubble breakup – Gas exiting the plate orifices is immediately subjected to extreme shear and impact forces that shatter large bubbles into micro-bubbles.
• Intense local turbulence – The high-energy dissipation zone surrounding the head continuously deforms and fragments bubbles while promoting rapid surface renewal.
• Forced recirculation – The powerful pumping action of the rotor-stator draws liquid and already-dispersed gas back through the head, ensuring repeated contacting and uniform distribution throughout the batch.
• Cavitation assistance – In many operating regimes, localized pressure fluctuations further aid bubble size reduction and gas dissolution.

The result is a fine, stable gas dispersion with high interfacial area and rapid mass-transfer rates—even in challenging high-viscosity or high-solids systems.

Design Flexibility and Customization

Because every process has unique gas flow rates, pressure requirements, liquid properties, and vessel geometries, Kady gasification plates are engineered to order. Key design variables include:

• Orifice size, pattern, and open area to match desired gas flow and pressure drop
• Materials of construction (stainless steel, Hastelloy, abrasion-resistant alloys, or specialty coatings) selected for chemical compatibility and wear resistance
• Integration with top-entry or bottom-entry mill configurations
• Provision for single-gas or multi-gas injection
• Optional temperature control or jacketed designs when reaction heat or cooling is required
• Sealing and pressure-rated designs for elevated-pressure or vacuum systems

The plate can be supplied as part of a new Kady mill or retrofitted to existing equipment in many cases. Laboratory and pilot-scale testing allows optimization of orifice geometry, gas flow rate, and tip speed before full-scale implementation.

Process Advantages

• Dramatically increased mass-transfer rates – Micro-bubble generation and continuous interface renewal accelerate dissolution or reaction of the injected gas.
• Higher gas utilization efficiency – More complete dissolution reduces the volume of unreacted or undissolved gas that must be handled downstream.
• Uniform dispersion in difficult media – High-shear action maintains fine bubbles even in viscous, solids-laden, or non-Newtonian liquids where conventional spargers fail.
• Reduced processing time – Faster gas-liquid contacting shortens batch cycles for aeration, hydrogenation, oxidation, or other gas-dependent reactions.
• Improved product consistency – Uniform gas distribution eliminates localized concentration gradients that can cause quality variations.
• Flexibility for multiple gases – The same platform can handle air, oxygen, nitrogen, hydrogen, carbon dioxide, or process-specific reactive gases with appropriate materials and sealing.
• Integration with simultaneous solids dispersion – Many applications require both gas injection and particle-size reduction or homogenization; a single Kady mill performs both functions.

Typical Applications

Custom gasification plates on Kady mills are used across a wide range of industries and processes, including:

• Aeration and oxygenation of wastewater, fermentation broths, and biological treatment systems
• Hydrogenation and other catalytic gas-liquid reactions
• Carbonation of beverages or process liquids
• Inert-gas blanketing or sparging for oxygen-sensitive formulations
• Oxidation or chlorination reactions requiring fine gas dispersion
• Flotation and mineral processing applications
• Specialty chemical and pharmaceutical processes needing precise gas-liquid contacting
• Simultaneous dispersion of solids and injection of gas in coatings, adhesives, or slurry systems

Why Specify Kady Gasification Technology

Conventional gas injection methods rely primarily on buoyancy and moderate turbulence. Kady gasification plates place the gas introduction point inside the highest-energy zone of a rotor-stator mill, where shear rates and turbulence intensities far exceed those of traditional agitators or spargers. The result is finer bubbles, higher interfacial area, and more efficient mass transfer—particularly in systems that are viscous, solids-rich, or otherwise difficult to aerate.

Kady International has designed and manufactured high-speed rotor-stator dispersion mills in Scarborough, Maine since 1949. Our engineering team routinely develops custom gasification plates and complete gas-liquid contacting systems matched to specific process requirements. Equipment is operating in more than forty countries across chemical, pharmaceutical, food, environmental, and industrial process applications.

Whether the need is simple aeration, high-pressure reactive gas injection, or simultaneous solids dispersion and gas contacting, a custom Kady gasification plate integrated with a high-speed mill provides a robust, high-performance solution.

Need efficient gas injection into your liquid system? Contact Kady International to discuss your gas type, flow rate, liquid properties, vessel geometry, and process goals. Our engineers will design a gasification plate and mill configuration optimized for your application.

Kady International
30 Parkway Drive
Scarborough, ME 04074
Phone: 207.883.4141
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KADY® high-speed rotor-stator dispersion mills – mixing, dispersing, blending, emulsifying, aerating, and homogenizing solutions for demanding fluid/solid and gas-liquid applications.