Ultrasonic Technology in Degassing Application

Ultrasonic degassing is a physical method that uses high-frequency sound waves (usually 20 kHz–1 MHz) to remove dissolved or dispersed gases in liquids. This technology is widely used in metallurgy, chemical industry, food, medicine and other fields. It has the advantages of high efficiency, energy saving and environmental protection, and can replace traditional heating or vacuum degassing methods. The local instantaneous high pressure effectively removes the air inside the liquid.

Existing degassing systems can be improved,won' t destroy food components. And the

such as heating, vacuum or bubbling. Used in industrial scale, for example in the food and

ultrasonic cavitation can improve the no beverage industry, chemical solutions, hydraulic oils, coolants, drilling fluids, crude condensation of bacteria, make bacteria oils, emulsions, paints, inks, adhesives, virulence loss or death, so as to achieve the varnishes, coatings, epoxies, shampoos, detergents and many other products.

Principle of ultrasonic degassing

Cavitation effect drives gas precipitation

When ultrasonic waves propagate in liquid, cavitation bubbles are generated, and their growth and collapse process promotes degassing through the following mechanisms:

Gas nucleus aggregation: tiny gas nuclei (dissolved gas) in the liquid expand in the negative pressure phase of the sound wave to form microbubbles.

Bubble merging: cavitation bubbles merge with surrounding dissolved gas during oscillation to increase bubble size.

Buoyancy rise: large bubbles quickly float to the liquid surface and escape due to buoyancy.

Acoustic Streaming

The macroscopic liquid flow generated by ultrasound enhances the gas transmission efficiency and avoids local gas enrichment.

Influencing factors

Frequency: Low frequency (20–50 kHz) is more conducive to the generation of large bubbles and is suitable for high-viscosity liquids.

Power: Need to be optimized to avoid excessive cavitation and liquid splashing.

Liquid properties: Viscosity, surface tension and gas solubility affect the degassing rate.

Application of ultrasonic degassing

Metal melt degassing (metallurgical industry)

Aluminum/magnesium alloy casting: remove harmful gases such as H₂, prevent pore defects, and improve material mechanical properties.

Steel liquid treatment: reduce oxide inclusions and improve ingot quality.

Chemical and polymer industries

Polymer degassing: remove bubbles in resins and adhesives to improve product uniformity.

Chemical reaction system: avoid gas side reactions interfering with the catalytic process.

Food and medicine

Beverage deoxygenation: extend the shelf life of beer and juice.

Medical liquid treatment: ensure that there are no bubbles remaining in injections or biological preparations.

Water treatment

Remove dissolved oxygen: prevent pipeline corrosion or microbial growth.

Advantages

Energy-saving and efficient: more than 50% lower energy consumption than vacuum degassing, shortened processing time.

Non-thermal process: suitable for heat-sensitive liquids (such as biological agents).

In-line integration: can be used with continuous production lines.

Conclusion

As a green process, ultrasonic degassing has shown irreplaceable value in many industrial fields. In the future, with the refinement of acoustic equipment, its application scope will be further expanded.