Abstract: An installation for the treatment of objects in a defined gas atmosphere whose oxygen content is smaller than that of air and with which environmentally damaging treatment gases are produced with a housing with an entry opening and with an exit opening for the objects passing through, conveyed through the housing, with a first treatment zone in the housing, which comprises the entry opening and which produces the treatment gas for the production of a process gas atmosphere, with a second treatment zone which is connected to the exit opening and which is connected to the first treatment zone via a passage opening for the objects and in which the atmosphere is lean of treatment gas and oxygen, with a circulation for the process gas with which a ventilator suctions process gas from the first treatment zone and sends it via a filter device which holds back the treatment gas, with a first sluice which is allocated to the entry opening and which is flowed upon by the purified process gas coming from the filter

Abstract: A process for the recovery of solvents is disclosed. A hot carrier gas stream laden with solvent vapors from an evaporation space is compressed, cooled, and expanded with production of work for condensing and separating the solvent. The carrier gas stream lean in solvent vapors is conducted back into the evaporation space after being reheated. The whole of the work arising on expansion is transferred in direct mechanical coupling to one of two or more compression stages for compression of the carrier gas stream laden with solvent vapors. An apparatus for practicing the process is also disclosed.

Abstract: The present invention relates to the cleaning or stripping of coated objects. The coating is dissolved in a receiver tank rendered inert by means of nitrogen, by a solvent and the mixture of solvent and coating product is transferred into a thickening tank swamped by a heated nitrogen flow. The nitrogen-solvent mixture is separated by cooling and condensation of the solvents extracted. The invention is applied to the stripping of objects coated with paints and varnish.

Abstract: A process and an apparatus for the recovery of solvents adsorbed from exhaust air containing solvent vapors by an adsorbent is disclosed. A stream of hot inert gas is made to pass preferably, in an alternating manner through two absorbent charges laden with solvent to achieve desorption. The solvent vapors picked up by the stream of inert gas are condensed and separated. The stream of inert gas, lean in solvent vapors, is used as a desorption medium.

Abstract: A process for drying solvent containing material is disclosed. The solvent containing material is passed through a drying chamber containing an inert gas. Inert gas is introduced into at least one lock chamber preceding and/or following the drying chamber. An annular flow of inert gas is produced in the lock chamber. A minor amount of the inert gas required for drying the material is jetted into the lock chamber proximate to the inlet and/or outlet opening of the drying chamber and a mixture of inert gas and sucked-in external air being discharged from the lock chamber in the peripheral region of the annular flow. The major portion of the inert gas is introduced directly into the drying chamber. An apparatus for practicing the invention is also disclosed.