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Vacuum drying

Vacuum drying. A thermal separation process to remove moisture present in a substance by means of vacuum. With low temperatures and short drying times.


How does vacuum drying work?

Vacuum drying is used in many industrial sectors to dry substances fast, gently and energy-efficiently. The liquid contained in the processed materials is evaporated by pressure reduction and extracted as vapor.

This technique is therefore particularly suited for drying of sensitive products that would be destroyed or degraded if being dried by means of heat. For example, chemicals, pharmaceuticals or foodstuffs.

Moreover, vacuum drying is the procedure of choice for drying of products with a large surface area. Such as plastic granules or other hygroscopic materials and industrial components.

Busch Vacuum Technology for Vacuum Drying

We offer the optimum vacuum generator for all of these drying processes. And for many more.

Applications where vacuum drying is used

Vacuum drying in the chemical and pharmaceutical industry

Drying is one of the most common and important processes in the chemical and pharmaceutical industries. It consists of removing a solvent from a solution or a suspension to form a dry solid.

The water or liquid is removed by vaporization which normally requires heat.

Vacuum, however, allows to lower the evaporation point of the liquid. And to reduce the contact of the substance to be dried with oxygen from the ambient air. Therefore, the substances are not damaged during the drying process. Moreover, vacuum drying lowers the risk of explosion and allows for significant energy savings.

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Vacuum drying in the plastics industry

Vacuum drying is commonly used in the plastics industry to remove moisture from plastic material. And thus preparing it for molding or extrusion.

Vacuum dryers allow to gently dry plastics at low temperatures,as the boiling point of water can be lowered by means of vacuum. This means that the material does not need to be heated up to high temperatures. Drying times can therefore be shortened which reduces the risk of material degradation. This would otherwise result from the materials being exposed to elevated temperatures over a long period of time.

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Vacuum drying in the woodworking industry

Vacuum drying is increasingly replacing the conventional drying of wood. Under vacuum, the boiling point of water is reduced which enables the drying of wood at lower temperatures.

This brings considerable advantages. The energy consumption can be significantly reduced. Drying times are shorter. And drying defects caused by heat can be avoided. The lack of oxygen during the drying process is another important benefit. It ensures that the wood retains its original color.

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Vacuum drying in practice

  • Pre-cooling lettuces reliably, thanks to cutting-edge vacuum technology

    Pre-cooling lettuces reliably, thanks to cutting-edge vacuum technology

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