Patent ID: 7021296
Filing Date: 2006-04-04
Classification: B01D,F02M

Abstract:
1. An evaporative emission control system for a vehicle, comprising a primary canister comprising activated carbon granules as hydrocarbon adsorbent and, downstream of the activated carbon granules a scrubber containing an activated carbon fiber material selected to adsorb butane and/or pentane isomer vapors in low concentrations in air passing through the scrubber and to desorb the adsorbed butane and/or pentane isomer vapors without heat, wherein the activated carbon fiber material has an average fiber diameter of from about 8 to about 10 microns and has an average pore diameter of up to about 20 Angstroms, wherein the activated carbon granules are capable of absorbing higher amounts of hydrocarbon vapor from exhaust air than the activated carbon fiber material and the activated carbon fiber material is capable of adsorbing higher amounts of butane and/or pentane isomer vapors in low concentrations from the air than the activated carbon granules.