Abstract: The invention concerns a process for the recovery of a solvent adsorbed in an adsorber, or other substances which are condensable. The adsorber (3) is, at first, heated to a temperature which is below the decomposition temperature of the solvent, then the adsorber chamber (2) is sealed off from the surroundings and a high negative pressure is applied to the adsorber chamber (2), as a result of which the solvent is desorbed. During a portion of the time when this high negative pressure is applied, the temperature of the adsorber (3) is brought to a value which is above the decomposition temperature of the solvent. In spite of this, there is no decomposition under the noted conditions, however, the high temperature does enable an almost complete desorption of the solvent. Finally, the desorbed solvent is drawn off from the adsorber chamber (2) and condensed.