DEVICE AND METHOD FOR REMOVING WATER AND CARBON DIOXIDE FROM A GAS MIXTURE USING PRESSURE SWING ADSORPTION

摘要

A pressure swing adsorption (PSA) dryer for separating water and carbon dioxide from a gas stream includes two compound adsorbent columns [ 32, 42 ]. Each column comprises a primary adsorption material for adsorbing water and a secondary adsorbent that adsorbs carbon dioxide. The secondary adsorbent comprises a solid amine. The secondary adsorbent may be, for example, a highly porous polystyrene matrix with amine groups bonded to the porous resin structure. Preferably, a mixture of the primary and secondary adsorbent materials forms an intermediate layer [ 38, 48 ] sandwiched between a top layer [ 34, 44 ] and bottom layer [ 36, 46 ] of pure water adsorbent material in each of the columns [ 32, 42].