Method for removing carbon dioxide from combustion exhaust gas

• US 6,500,397 B1
• Filed: 11/06/1998
• Issued: 12/31/2002
• Est. Priority Date: 02/27/1992
• Status: Expired due to Fees

• Current Assignee: Kansai Electric Power Company Incorporated, Mitsubishi Jukogyo Kabushiki Kaisha
• Original Assignee: Kansai Electric Power Company Incorporated, Mitsubishi Jukogyo Kabushiki Kaisha
• Inventors: Seto, Touru, Iijima, Masaki, Mimura, Tomio, Yoshida, Kunihiko, Karasaki, Mutsunori, Mitsuoka, Shigeaki, Shimojo, Shigeru
• Primary Examiner(s): Bos, Steven
• Assistant Examiner(s): Vanoy, Timothy C
• Application Number:
  US09/187,168
• Time in Patent Office: 1,516 Days
• Field of Search: 423/228, 423/229
• US Class Current: 423/228
• CPC Class Codes: B01D 53/1475 Removing carbon dioxide
• CPC Class Codes: B01D 53/1493 Selection of liquid materials for use as absorbents
• CPC Class Codes: Y02A 50/20 Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
• CPC Class Codes: Y02C 20/40 of CO2

Abstract

There are disclosed a method for removing CO₂ from a combustion exhaust gas which comprises the step of bringing the combustion exhaust gas under atmospheric pressure into contact with an aqueous solution of a hindered amine selected from the group consisting of 2-amino-2-methyl-1-propanol, 2-methylaminoethanol, 2-ethylamino-ethanol and 2-piperidineethanol; and another method for removing carbon dioxide from a combustion exhaust gas which comprises the step of bringing the combustion exhaust gas under atmospheric pressure into contact with a mixed aqueous solution of 100 parts by weight of an amine compound (X) selected from the group consisting of 2-amino-2-methyl-1, 3-propanediol, 2-amino-2-methyl-1-propanol, 2-amino-2-ethyl-1, 3-propanediol, t-butyldiethanolamine and 2-amino-2-hydroxymethyl-1,3-propanediol; and 1-25 parts by weight of an amine compound (Y) selected from the group consisting of piperazine, piperidine, morpholine, glycine, 2-methylamino-ethanol, 2-piperidineethanol and 2-ethylaminoethanol.

Claims

1. A method for removing carbon dioxide from a combustion exhaust gas containing oxygen gas which comprises the step of bringing said combustion exhaust gas under atmospheric pressure into contact with an aqueous solution consisting essentially of an absorbent selected from the group consisting of 2-(methylamino)-ethanol and 2-ethylamino ethanol.

4. The method of claim 1, wherein said combustion exhaust gas contains from about 9 to about 10% by volume of CO₂ and about 2 to about 3% by volume of O₂.

7. The method of claim 1, wherein the concentration of the absorbent is 25-65% by weight.

2. A method for removing carbon dioxide from a combustion exhaust gas containing oxygen gas consisting of the step of bringing the combustion exhaust gas under atmospheric pressure into contact with a mixed aqueous solution of 100 parts by weight of 2-amino-2-methyl-1-propanol;

and 1-25 parts by weight of piperazine.

5. The method of claim 2, wherein said combustion exhaust gas contains from about 9 to about 10% by volume of CO₂ and about 2 to about 3% by volume of O₂.

3. A method of removing carbon dioxide from a combustion exhaust gas containing oxygen gas which comprises the step of bringing the combustion exhaust gas under atmospheric pressure into contact with a mixed aqueous solution of 100 parts by weight of an amine compound selected from the group consisting of 2-amino-2-methyl-1, 3-propanediol, 2-amino-2-ethyl-1, 3-propanediol and2-amino-2-hydroxymethyl-1, 3-propanediol;

and 1-25 parts by weight of an amine compound selected from the group consisting of morpholine, glycine, 2-(methylamino)-ethanol and 2-(2-hydroxyethyl)piperdine.

6. The method of claim 3, wherein said combustion exhaust gas contains from about 9 to about 10% by volume of CO₂ and about 2 to about 3% by volume of O₂.