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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 9944575 B1

PDFFull Text
Date of Patent:
Apr. 17, 2018

Filed:

Feb. 27, 2014

Methane gas concentration method

Applicant:

Osaka Gas Co., Ltd., Osaka-shi, JP;

Inventors:

Shota Kawashima, Osaka, JP;

Takahisa Utaki, Osaka, JP;

Assignee:

Osaka Gas Co., Ltd., Osaka, JP;

Attorney:

The Webb Law Firm

Primary Examiner:

Brian A McCaig

Assistant Examiner:

Jason Y Chong

Int. Cl.
CPC ...
C07C 7/12 (2006.01); C10L 3/10 (2006.01); B01J 20/18 (2006.01); B01J 20/20 (2006.01); B01J 20/22 (2006.01); B01J 20/34 (2006.01); B01J 20/28 (2006.01); B01J 20/10 (2006.01); C07C 7/13 (2006.01); B01D 53/047 (2006.01); C07C 7/00 (2006.01);
U.S. Cl.
CPC ...
C07C 7/12 (2013.01); B01D 53/047 (2013.01); B01J 20/103 (2013.01); B01J 20/18 (2013.01); B01J 20/20 (2013.01); B01J 20/223 (2013.01); B01J 20/2808 (2013.01); B01J 20/3416 (2013.01); B01J 20/3425 (2013.01); B01J 20/3433 (2013.01); B01J 20/3491 (2013.01); C07C 7/005 (2013.01); C07C 7/13 (2013.01); C10L 3/101 (2013.01); B01D 2253/102 (2013.01); B01D 2253/106 (2013.01); B01D 2253/108 (2013.01); B01D 2253/204 (2013.01); B01D 2257/7025 (2013.01); B01D 2259/404 (2013.01); B01D 2259/40071 (2013.01); B01D 2259/40075 (2013.01); C10L 2290/542 (2013.01); C10L 2290/58 (2013.01); Y02C 20/20 (2013.01); Y02P 20/156 (2015.11);
Abstract

Adsorption towers are filled with adsorbents that adsorb methane gas in coal mine gas and perform a PSA cycle. For each of adsorption towers, a plurality of different pressure states of the internal pressure of the adsorption tower are set as an intermediate pressure state. As a pressure equalization step, an initial pressure equalization step of transferring the gas in one of the adsorption towers that is in a high pressure state to another one of the adsorption towers that is in an intermediate pressure state, and a final pressure equalization step of transferring the gas in one of the adsorption towers that is in the high pressure-side intermediate pressure state to another one of the adsorption towers that is in the low pressure state are performed.

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