Method and system for desorption and recovery of desorbed compounds

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;
• feeding the vaporized cryogenic fluid into the recirculation stream of inert gas, the cryogenic fluid being liquid nitrogen;
• stopping feeding of the vaporized cryogenic fluid, which is used to cool at least a part of the gas effluent, into the recirculation stream of inert gas;
• stopping circulation of the recirculation stream of inert gas;
• sucking in the recirculation stream of inert gas to generate a negative pressure in a bed of the material to be desorbed and regenerated;
• and
• delivering sucked gas to the cooling means.