Patent ID: 8404022

Claim:
A method of concentrating ozone gas in which an ozone-oxygen mixture gas is acted in an adsorbing column ( 2 ) that is filled with an adsorbent ( 1 ), to cause the adsorbent ( 1 ) to selectively adsorb ozone gas, and the selectively adsorbed ozone gas is desorbed, thereby concentrating and purifying the ozone gas, wherein the ozone-oxygen mixture gas is acted on the adsorbent ( 1 ) in a non-cooled state to cause the ozone gas to be selectively adsorbed to the adsorbent ( 1 ); the adsorbing column ( 2 ) is vacuumed when performing an operation of desorbing the ozone gas, thereby desorbing the ozone gas from the adsorbent ( 1 ); for a constant time period after start of vacuuming, led-out ozone gas which is led out of the adsorbing column ( 2 ) is discarded; and, after elapse of the constant time period, the led-out ozone gas which is led out of the adsorbing column ( 2 ) is recovered.