Patent ID: 8608832

Claim:
A method for concentrating or diluting only a specific gas from a gas containing plural gas species wherein a chamber is filled therein a particle material for condensation and vaporization of the specific gas or is equipped therein a gas transmission member selectively transmitting other gases than the specific gas, with a function of cooling the gas in the chamber, and a gas feeding and retrieving system having a function of retrieving a gas containing the specific gas having been diluted or retrieving a gas containing the specific gas having been concentrated is provided; and including the following steps: introducing the specific gas containing the plural gas species to the chamber; cooling the gas in the chamber, thereby selectively condensing only the specific gas or selectively transmitting the other gases than the specific gas on a surface of the particle material or the gas transmission member, so as to realize dilution of the specific gas by a diluted gas retrieving part of the chamber; and heating a surrounding of a concentrated gas retrieving part of the chamber while streaming down a liquid condensed on the surface of the particle material or the gas transmission member to a lower part of the chamber by gravitation, thereby vaporizing the condensed gas on the surface of the particle material to realize high concentration of the specific gas at a concentrated gas retrieving part of the chamber, and continuously retrieving a gas containing the specific gas having been diluted from the diluted gas retrieving part of the chamber or a gas containing the specific gas having been concentrated from the concentrated gas retrieving part of the chamber.