CO2 RECOVERY METHOD USING CRYO-CONDENSATION

摘要

Disclosed is a method for producing at least one gas having a low CO2 concentration and one or more primary fluids having a high CO2 concentration from a fluid which is to be treated and contains CO2 and at least one compound that is more volatile than CO2. Said method comprises the following steps: a) the fluid to be treated is subjected to a first cooling process using heat exchange without the fluid undergoing a change of state; b) at least some of the fluid to be treated and cooled in step a) is cooled a second time such that a solid is obtained which contains mainly CO2 and at least the gas having a low CO2 concentration; and c) a step in which at least some of said solid is liquefied and/or sublimed such that the one or more primary fluids having a high CO2 concentration are obtained. The disclosed method is characterized in that at least some of the cold required for the first cooling process and/or the second cooling process is supplied by one or more refrigeration cycles, each of which includes at least one quasi isentropic expansion of a gas.