Method for removing carbon dioxide from combustion exhaust gas

• US 6,036,931 A
• Filed: 06/03/1997
• Issued: 03/14/2000
• Est. Priority Date: 02/27/1992
• Status: Expired due to Term

• Current Assignee: Kansai Electric Power Company Incorporated, Mitsubishi Jukogyo Kabushiki Kaisha (Mitsubishi Heavy Industries, Ltd.)
• Original Assignee: Kansai Electric Power Company Incorporated, Mitsubishi Jukogyo Kabushiki Kaisha (Mitsubishi Heavy Industries, Ltd.)
• Inventors: Iijima, Masaki, Mimura, Tomio, Yoshida, Kunihiko, Karasaki, Mutsunori, Mitsuoka, Shigeaki, Shimojo, Shigeru, Seto, Touru
• Primary Examiner(s): Lewis, Michael
• Assistant Examiner(s): DI MAURO, PETER T
• Application Number:
  US08/867,988
• Time in Patent Office: 1,015 Days
• Field of Search: 423/226, 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-ethylaminoethanol 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-methylaminoethanol, 2-piperidineethanol and 2-ethylaminoethanol.

Claims

1. A method for removing carbon dioxide from a combustion exhaust gas which comprises the step of bringing said combustion exhaust gas under atmospheric pressure into contact with a mixed aqueous solution of 100 parts by weight of an amine compound (X) which has one alcoholic hydroxyl group and a primary amino group in its molecule, said primary amino group being bonded to a tertiary carbon atom having two unsubstituted alkyl groups;

and 1-25 parts by weight of an amine compound (Y) selected from the groups consisting of (E) piperidine, (F) morpholine, (G) glycine, and (H) a compound having one alcoholic hydroxyl group and a secondary amino group in its molecule, said secondary amino group having an unsubstituted alkyl group of 3 or less carbon atoms and an N atom bonded to a group having a chain of 2 or more carbon atoms.

2. A method for 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 (X), consisting of 2-amino-2-methyl-1 -propanol;

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