Compound including oxalate, carbon dioxide absorbent including the same, method of preparing carbon dioxide absorbent and method of removing carbon dioxide

Patent metadata

Field	Value
Publication number	US-9713790-B2
Application number	US-201314140063-A
Country	US
Kind code	B2
Filing date	Dec 24, 2013
Priority date	Aug 21, 2013
Publication date	Jul 25, 2017
Grant date	Jul 25, 2017

Abstract

Disclosed are a compound including an oxalate, a carbon dioxide absorbent including the same, a method of preparing the carbon dioxide absorbent and a method of removing carbon dioxide, which may overcome issues of high recycling energy and low absorptivity of a conventional carbon dioxide absorbent to considerably reduce recycling energy and absorb a greater amount of carbon dioxide per unit absorbent, so that a size of a carbon dioxide absorption tower may be reduced and a less amount of recycling energy may be used, contributing to a substantial decrease in device manufacture costs and management costs.

First claim

What is claimed is:

1. A compound comprising:
a divalent metal ion;
an oxalate; and
an amine ligand;
wherein the divalent metal ion comprises magnesium, and
wherein the amine ligand comprises at least one selected from the group consisting of monoethanolamine (MEA), diethanolamine (DEA), triethanolamine, methylmonoethanolamine, methyldiethanolamine, dimethylmonoethanolamine, diethylmonoethanolamine, monoisopropanolamine, diisopropanolamine, piperazine, 1-methylpiperazine, 2-methylpiperazine, dimethylpiperazine, 1-ethylpiperazine, 1-(2-aminoethyl)piperazine, 1-(2-hydroxyethyl)piperazine, 2-piperidinemethanol, 2-piperidineethanol, 2-amino-2-methyl-1-propanol, 2-amino-2-methyl-butanol, 2-amino-2-ethyl-1-propanediol, 3-aminopropanol, 2-ethylaminoethanol, 2-methylaminoethanol and 2-diethylaminoethanol.

2. The compound of claim 1 , wherein the divalent metal ion is present, in the compound, in an amount of 10% by weight (wt %) to 50 wt %.

3. The compound of claim 1 , wherein the oxalate is present, in the compound, in an amount of 45 wt % to 70 wt %.

4. The compound of claim 1 , wherein the amine ligand is present, in the compound, in an amount of 35 wt % to 60 wt %.

5. A carbon dioxide absorbent comprising:
the compound of any one of claim 1 , 2 , 3 or 4 ; and
an organic solvent.

6. The carbon dioxide absorbent of claim 5 , wherein the organic solvent comprises at least one selected from the group consisting of ethylene glycol, propylene glycol, butylene glycol, hexylene glycol, diethylene glycol, dipropylene glycol and triethylene glycol.

7. A method of preparing a carbon dioxide absorbent, the method comprising:
preparing the compound of claim 1 ; and
mixing the compound and an organic solvent.

8. A method of removing carbon dioxide, the method comprising:
bringing a gas comprising carbon dioxide into contact with the carbon dioxide absorbent of any one of claim 1 , 2 , 3 or 4 ;
absorbing carbon dioxide from the gas; and
recycling the carbon dioxide absorbent.

9. The method of claim 8 , wherein the absorbing of the carbon dioxide is carried out at a pressure in a range of atmospheric pressure to 10 atmospheres (atm), and at a temperature in a range of room temperature to 70° C.

10. The method of claim 8 , wherein the recycling of the carbon dioxide absorbent is carried out at a pressure in a range of atmospheric pressure to 5 atm, and at a temperature in a range of 80° C. to 150° C.

11. The carbon dioxide absorbent of claim 5 , wherein the organic solvent comprises ethylene glycol.

Assignees

• Korea Energy Research Inst

Inventors

• Jeong Soon Kwan
• Yoon Yeo Il
• Nam Sung Chan
• Choi Soo Hyun
• Yoon Sung Ho
• Kim Nam Seok
• Joo Bon Sik

Classifications

• B01D2252/2053

  Other nitrogen compounds · CPC title

• B01D53/1475

  Removing carbon dioxide · CPC title

• B01D53/1493

  Selection of liquid materials for use as absorbents · CPC title

• B01D2258/0283

  Flue gases · CPC title

• B01D53/62 Primary

  Carbon oxides · CPC title