Patent ID: 6797127
Filing Date: 2004-09-28
Classification: A61L,B01D

Abstract:
A method for purifying an oxygen containing gas comprising:a first step of generating ozone in the oxygen containing gas; a second step of radiating ultraviolet rays of a medium wavelength of 200 nm or longer, but shorter than 300 nm, to the gas treated in the first step to form active oxygen; a third step of radiating ultraviolet rays of a wavelength of 300 nm or longer, but shorter than 380 nm, to the gas treated in the second step to convert said active oxygen into an oxygen molecule in a ground state, at least one of said second step or said third step being conducted in the presence of a photocatalyst including at least one of particles of titanium oxide of an orthorhombic crystal system or particles of titanium oxide of an orthorhombic crystal system supporting fine particles of another metal; and a step of irradiating the oxygen containing gas treated in said third step, with rays radiated from an infrared lamp and with rays radiated from a halogen lamp to dry the gas.