Method of separating vaporous substances from air saturated with high proportions of components having a low boiling point

A method of separating by condensation and absorption vaporous substances from a gaseous medium containing a high proportion of components having a low boiling point and at least some of which are non-condensible, comprising the steps of:

• cooling said gaseous medium in scrubber means;
• providing in said scrubber means a location having a temperature sufficiently low to reduce said components to a liquid condensate having an inherent coldness component and containing said non-condensible components solved therein;
• removing said liquid condensate including said non-condensible components solved therein;
• increasing the pressure of said liquid condensate including said non-condensible components solved therein;
• transferring said inherent coldness component to a circulating refrigerant medium to reduce the temperature thereof, thereby raising the temperature of said liquid condensate to ambient temperature;
• removing a quantity of liquid condensate equal to the quantity of vaporous substance contained in said gaseous medium;
• thermally degassing said removed quantity of liquid condensate and extracting, in vaporous state, said non-condensible components solved therein;
• removing water from said liquid condensate;
• recirculating said liquid component as a refrigerant with improved absorbability for components having a low boiling point.