Patent ID: 7419641

Claim:
Evaporation device of a liquid solution based on solvent and compounds or solutes inside an enclosure containing: evaporation zones at different temperatures which correspond to the respective evaporation temperatures of the n constituents of the solution, and means for separating the vapors of the solvent and of the compounds, wherein, the different evaporation zones are separated by separating partitions into several distinct elementary chambers enabling fractionated evaporation via outlets generating a plurality of separate flows of vapor specific to each constituent, the solution is injected into a first chamber subjected to the lowest temperature (T 1 ) so as to impregnate a porous mobile element that passes through the different partitions being successively in contact with said chambers heated to increasing temperatures, means for injecting a neutral carrier gas in the vicinity of the partitions for control of the pressure losses of the gas flows between the different chambers, and means for injecting a neutral carrier gas are formed next to each separating partition by three distinct inlet ducts, two inlet ducts being respectively arranged on both sides of each separating partition and one inlet duct opening out into a hole of each separating partition, the hole allowing movement of the porous mobile element between two elementary chambers.