Patent ID: 7604691

Claim:
An adsorption filter for fuel vapors from the tank container in particular of an internal combustion engine in particular of a motor vehicle, said filter being regenerable by desorptive countercurrent backflushing and in which the adsorptive and/or desorptive filter material has heatstoring substances comprised of phase change material (PCM material =phase change material), wherein different phase change materials ( 7 ′, 7 ′) with individual phase change temperatures (conversion temperatures) are provided, which are arranged one after the other in the direction of flow through the adsorption filter, the phase change materials ( 7 ′, 7 ″) are distributed in small units within the reactive filter material, the filter material is activated carbon, which is in the form of granules ( 6 ), whereby wax in the form of tiny sheathed beads combined to form larger pellets is added as a phase change material ( 7 ′, 7 ″) to the granules ( 6 ) of the activated carbon, whereby these pellets contains additional filler material having a good conductivity; and wherein the adsorption filter comprises two interconnected chambers ( 1 , 2 ), whereby the chamber ( 1 ) is on the fuel vapor end, while the chamber ( 2 ) borders the fresh air end, so that the chamber ( 1 ) is upstream of the chamber ( 2 ) with respect to the direction of flow through the adsorption filter, in chamber ( 1 ) is arranged phase change material consisting of ( 7 ′), while in chamber ( 2 ) is arranged phase change material consisting of ( 7 ″); and wherein said phase change material ( 7 ′′) has a relatively high phase change (conversion) temperature and said phase change material ( 7 ′) has a relatively low phase change (conversion) temperature.