Abstract: Process for producing an atmosphere for the manufacture of high performance composite parts, of the type wherein the atmosphere is used in an autoclave above a superposition of cutouts with fibrous structure impregnated with a thermosetting organic material disposed between a lower mold and an upper sealing covering member, the space between the covering member and the mold being under vacuum. The atmosphere is nitrogen gas prepared from raw nitrogen by separation from air through permeation or adsorption, incorporating a residual content of oxygen between 0.5% and 6%, with a low content of water vapor. Application for example to the manufacture of secondary and primary structures in aeronautical and space construction.

Abstract: Process for the gas treatment of a product in a confined treatment zone by a flow of an inert gas, such as nitrogen, wherein a gas flow which originates from a gas treatment containing a high proportion of nitrogen, becomes loaded with impurities such as: oxygen, and/or carbon dioxide, and/or water, and wherein the flow of gas which originates from the treatment undergoes at least substantially in part, a removal of the impurities in a separator of the adsorption or permeation type before being recycled as treatment gas, with addition of a compensating gas flow predominantly containing nitrogen. Application for example to the deoxygenation of liquids, in particular nutritious liquids, to the providing of inert conditions in ovens or storage enclosures for products such as electronic pieces, or in chambers used for preserving nutritious products in an atmosphere which is substantially free from oxygen.