PERFEZIONAMENTI AL PROCEDIMENTO DI SEPARAZIONE DI UNA MISCELA GASSOSA PER UTILIZZAZIONE DI UN ASSORBENTE SELETTIVO RAPIDO MIGLIORATO

A method of separating the constituents of a gaseous mixture comprising a first stage of injecting the gaseous mixture to be processed, eg a vaporised hydrocarbon mixture (7), with a vector gas 8 in a column (22, 23, 24) provided with a selective adsorbent capable of saturating the latter, then a second stage of periodically injecting into the column a mixture of vector gas and less than 40% of the gaseous product to be purified injected in the first stage and then comprising successive collection (25, 26) of the fraction enriched by the non-adsorbed constituent and the fraction containing the purified adsorbed constituent, is characterised in that the method employs an apparatus equipped with a plurality of columns (22, 23, 24) disposed in parallel, filled with a selective adsorbent to which possibly a hydrogenating catalyst is added, in which evaporation of the charge is carried out (4) continuously and at a constant rate of flow, at a temperature and pressure which are determined by the product to be purified, the vector gas being recycled (6) and preheated by exchange (2, 3) of heat with the effluents (26). The heat exchange (2, 3) cools the effluents resulting in condensation of the gaseous mixture components enabling their separation (29, 30) from the vector gas to be recycled.