Chemical Industry

Central vacuum supply
Central vacuum supply systems are used to replace a multitude of individual generators. The advantage of this configuration: lower energy consumption and controlled removal of cooling energy.

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When industrial surfaces are coated, metal vapours are handled under vacuum. In typical processes the metal condenses as a thin layer on the surface of the substrate. Vacuum is necessary to keep the metal vapours under pressure.

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Surfaces are cooled through the controlled evaporation of water or other solvents. The latent heat of the substrate and the vacuum remove the localised heat, causing a cooling effect.

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Continuous and batch distillation
See “Solvent recovery.”

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Extruders are typically used for product degassing. In extruders highly viscous substances are compressed and simultaneously freed of solvents. The vacuum pump used serves exclusively to evacuate low boiling point solvents as well as any air that has entered the material through leaks.

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All medicinal products are dried before entering the marketplace. Solvents are removed from the product in a heatable static or dynamic dryer. The advantage of vacuum drying is that the product can be processed at low temperatures. The temperature always corresponds to the vapour pressure of the solvent being used.

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Gas compression
Gases must be compressed before they can be pumped through pipelines for further use. In many cases this compression is also necessary in order to reduce the volume of storage space required.

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Impregnation involves the following process: The final product, a motor winding for example, is evacuated in a receiving vessel. A suitable impregnating agent, such as a resin, penetrates the surface of the material under vacuum.

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Pneumatic conveying
Chemicals can be conveyed safely and economically with stand-alone compressors or vacuum pumps and central systems. Dust free and therefore loss-free conveying, simple design of the piping and no deformation of the conveyed material are assured.

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Solvent recovery

Wastewater that is contaminated with solvents must be treated for environmental reasons. The simplest method is vacuum distilling, where the low-boiling-point fraction is evaporated and then condensed. The wastewater is then transported elsewhere for further use.

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Thin-layer evaporation
This process, which is also called molecular evaporation, is used to separate substances that have narrow boiling point ranges. Such equipment has a special design that only operates properly at specific vacuum levels.

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