Patent ID: 7294173

Claim:
A method for desorption and recovery of desorbed compounds from a material, comprising: generating a recirculation stream of inert gas, which passes through the material to be desorbed; heating the recirculation stream of inert gas to a temperature sufficient to cause a desorption process; yielding a gas effluent from the recirculation stream of inert gas in such a manner that the recirculation stream of inert gas maintains constant pressure; delivering the gas effluent to cooling means adapted for cooling the gas effluent; cooling the gas effluent to cause condensation of the desorbed compounds contained in the gas effluent, said cooling being obtained at least partly by pressure vaporization of a cryogenic fluid; and feeding the vaporized cryogenic fluid into the recirculation stream of inert gas; wherein the cryogenic fluid is liquid nitrogen.