PRINCIPLE

Drawn-up gases and vapours are compressed by the liquid ring pump until they reach atmospheric pressure. Along with ring liquid, they are then cooled in a heat exchanger (where the vapours are condensed).

Condensates and ring liquid are recovered in the separator tank and returned to the liquid ring pump whereas saturated incondensables are exhausted through the vent.

This means that the amount of residual vapours released to atmosphere only depends on the chosen cooling liquid temperature.

Example : the output of toluene residual vapours exhausted through the vent would be (at 20°C) 0,1 kg/h for 1 kg of dry air. At - 10°C, it would be only 0,014 kg/h.