PROCEDE DE PRODUCTION PAR PERMEATION, A PARTIR D'UN MELANGE GAZEUX, D'AU MOINS DEUX FLUX GAZEUX ET INSTALLATION DE MISE EN OEUVRE D'UN TEL PROCEDE

This method permits the production from a gaseous mixture containing a permeable component of at least two gaseous fluxes enriched in said component, with contents that are considerably different, compared to the gaseous mixture. In this method, a first permeation unit (20) is supplied by the gaseous mixture. A second permeation unit (22) is supplied by the non-permeate produced by the first unit (20), the permeate produced by the second unit (22) forming a first enriched flux. A third permeation unit (24) is supplied by the permeate produced by the first permeation unit (20), the permeate produced by the third permeation unit (24) forming a second enriched flux.