To provide a method for effectively concentrating concentrated methane gas and carbon dioxide gas, in high yield and to provide a concentrator.
The invention relates to the method for concentrating methane gas and carbon dioxide gas comprising following processes, a purification process separating methane gas in digested gas by contacting the digested gas with an absorption liquid 1 to preferentially dissolve carbon dioxide gas in the digested gas to prepare an absorption liquid 2, a deaeration process separating carbon dioxide gas from the absorption liquid 2 to prepare an absorption liquid 3, and a liquefaction process separating liquidized carbon dioxide gas and off-gas by liquidizing the separated carbon dioxide gas and then purifying, wherein the off-gas is mixed with the digested gas and repeatedly processed through the purification process, deaeration process and the liquefaction process, and the invention relates to the concentrator used in the concentration.
Tadashi Takahashi
Takashi Watanabe
Masakazu Aoyama
Suzuki Mitsuyoshi
Kazuya Nishi
Yasuhiko Murayama
Next Patent: BLOCK COPOLYMER MEMBRANE HAVING CYLINDER STRUCTURE ORIENTING PERPENDICULARLY