COLD TRAP SYSTEM FOR RECOVERING CONDENSABLE GAS FROM A VESSEL TO BE EVACUATED

摘要

1. A system for recovering a condensible gas by solidifying the same in a cold trap that comprises a vessel to be evacuated, a pump having an inlet and an outlet side and arranged to withdraw gas from said vessel, means connecting said vessel with the intake side of said pump, a refrigerated cold trap for solidifying said gas, said trap having an inlet and an outlet, means connecting the inlet of said cold trap with the outlet side of said pump, an absorbent trap connected with the outlet of said cold trap and arranged to absorb traces of the condensible gas passing through said cold trap, and means for admitting an inert and relatively incondensible gas into said vessel to purge the condensible gas therefrom.