Mechanical Vapor Recompression (MVR)

Lower steam consumption for processes and saving energy

Large quantities of process steam is required in numerous industrial applications. To achieve this, companies must use considerable amounts for energy. An effective measure to save energy – and to reduce the high consumptions of steam up until now – is the mechanical vapor recompression method, used in evaporation, distillation, crystallization and drying.

The MVR process

The temperature of the resulting process steam (vapor) is increased with a radial fan (mechanical vapor recompressor, MVR), and therefore to a higher energy level, and then fed back into the process as fresh heating steam. The energy contained in the steam is not lost; only the energy required to increase the temperature must be additionally raised.

The closed process enables to evaporate temperature-sensitive fluids such as milk in high vacuum at approx. 60 °C and even blood plasma at 35 °C. Valuable components for the end product (e.g. milk powder) remain unaffected and thus increase the quality and value of the product.

Areas of Application

Mechanical vapor recompression was initially used almost exclusively in the dairy industry. In the following years, its areas of application were expanded, and now include the dairy industry, brewing industry, sugar industry, saline industry, pulp industry, chemical industry, alcohol industry etc.

Thermal separation

Thermal separation is a widespread technology in many industries.

However, companies typically incur considerable energy costs due to the high demand for process steam. An effective measure to save energy, and to reduce high steam consumption, is the implementation of mechanical vapor compression. This technology is used in a wide variety of applications such as distillation, crystallization and concentration.


PILLER high-performance blowers are used as compressors in these processes and are precisely tailored to the application.


During distillation, liquid mixtures of substances with different vapor pressures and boiling temperatures are separated. Examples include distillation of alcohol, or the recovery and purification of solvents.


Evaporation produces a concentration of the substance being processed. In applications such concentrated milk or fruit juice production, evaporative systems are also used as a precursor to dryers in the food industry.


During the crystallization process, substances are separated from one another by using different solution equilibria. Applications include salt extraction and fertilizer production.

The Blower

PILLER high-performance blowers are used as compressors in these processes and are precisely tailored to the application.


The high-performance blowers from PILLER achieve the necessary temperature increases by means of impeller circumferential speeds of over 300 m/s. Even the impeller geometries are constantly optimized with regard to increasing demands for mechanical strength and efficiency.


MVR Blower Portfolio

Additional Processes

PILLER video – Insight into the production process

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