Mechanical Vapor Recompression with Positive Displacement Blower

The mechanical recompression of vapor is used for applications such as concentrating and drying of products with low energy consumption, thermal heat discharge recovery, compression of toxic vapors or for high value product recovery.


The operating principle is simple.

A liquid to be concentrated is first heated in an evaporator. 

The vapor from this evaporator is drawn in and compressed by the 'roots' positive displacment  blower, which increases its temperature by compression. 

This superheated vapor is then distributed to a heat exchanger for condensation. The heat from the exchanger is used to heat the liquid to be concentrated, which is then re-injected into the evaporator. 

This process loop produces a new quantity of vapor. With CMV mechanical vapor recompression, we recover a concentrate (for landfill or incineration) and a distillate (or condensate) for reuse. The reduction in the volume of liquid effluent, or even zero discharge, is significant, and cooling water consumption is low or non-existent.

This application reduces energy consumption and delivers unrivalled energy efficiency.


Solution for customer processes between 1,000 & 3,500 kg/h Water vapor, blower flow range determined by available machine size. 

  • Pressure operation: discharge temperatures up to T° saturation of 115°C for steam intake of 100°C. 
  • Vacuum operation: from a saturation T° of 85°C at suction, for steam discharged at 100°C.

To find out more, download our white paper on mechanical vapor recompression.



Hibon process blowers are used in this application to compress the vapors produced by evaporation. 

There are numerous references for Hibon process blowers in the chemical industry in ethanol and methanol processes. 

MVR - Mechanical vapor recompression using Hibon positive displacement blowers (roots type) is also used in the pharmaceutical industry for the distillation of pure water and essential oils. 

To protect the environment, Hibon has expertise in concentrating:

  • residues from polluted soils, 
  • heavy metals, 
  • cutting oils, 
  • radioactive oil, 
  • printing ink, 
  • brine, and the
  • treatment of rubber, paint and metal rejects. 

In the agri-food industry, many plants use PROCESS Hibon positive displacement blowers to concentrate juices (tomatoes, fish, etc.), brewing water, brine or in seawater desalination processes... More recently, the green oil sector, which is in full development phase, also uses mechanical vapor recompression processes equipped with rotary piston blowers.