Abstract: Process for improving the characteristics of absorption and desorption of a gas by a reaction medium consisting of several salts in powder form and a porous solid product, characterized in that it consists in mixing 0 to 60% by mass of the porous product with the powdered salt(s). The porous product consists of a mixture of expanded graphite and a second expanded product of rigid structure and high permeability.

Abstract: A method is provided of conducting a thermochemical absorption or desorption reaction between a gas and a solid in the presence of a heat-carrying fluid in a closed enclosure. This method comprises a first step in which, for the pressure prevailing in the reactor, the variation of the mean power of the reaction is determined as a function of the difference which exists between the temperature of the heat-carrying fluid and the equilibrium temperature of the reaction, given by the Clapeyron diagram, for defining an optimum zone in which the reaction takes place with maximum mean power, and a second step in which the reaction takes place, in which a reference temperature is imposed on the heat-carrying fluid such that the reaction takes place in the optimum zone.

Abstract: Method of conducting an absorption or desorption reaction between a gas and a solid in which the reaction medium is formed using a powdery solid having a compaction between 5 and 60% of the optimum compaction of the reaction without graphite.