CARBON DIOXIDE ABSORBENTS

• US 20110214566A1
• Filed: 05/06/2010
• Published: 09/08/2011
• Est. Priority Date: 03/02/2010
• Status: Abandoned Application

• Current Assignee: Hyundai Motor Company (Hyundai Motor Group), Kia Motors Corporation (Kia Corp.)
• Original Assignee: Hyundai Motor Company (Hyundai Motor Group), Kia Motors Corporation (Kia Corp.)
• Inventors: Chung, Sung Yeup, Lee, Ki Chun
• Application Number:
  US12/775,010
• Publication Number:
  US 20110214566A1
• Time in Patent Office: Days
• US Class Current: 95/173
• CPC Class Codes: B01D 2252/2025 Ethers or esters of alkylene glycols, e.g. ethylene or propylene carbonate
• CPC Class Codes: B01D 2252/20442 containing a piperidine-ring
• CPC Class Codes: B01D 2252/20484 with one hydroxyl group
• CPC Class Codes: B01D 2252/20489 with two or more hydroxyl groups
• CPC Class Codes: B01D 2252/30 Ionic liquids and zwitter-ions
• CPC Class Codes: B01D 2252/504 Mixtures of two or more absorbents
• CPC Class Codes: B01D 53/1425 Regeneration of liquid absorbents
• 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

The present invention relates to a carbon dioxide absorbent. In particular, the present invention relates to a carbon dioxide absorbent comprising an ionic liquid, amine and glycol. Since the carbon dioxide absorbent of the present invention can retain excellent CO₂ absorption capacity despite repetitive regenerations at low temperature, it can reduce energy consumption and a loss of absorbents used, and therefore, can be effectively used for a process of collecting carbon dioxide from exhaust gas and natural gas and separating the same.

Claims

1. A carbon dioxide absorbent comprising an ionic liquid, an amine and a glycol.

2. The carbon dioxide absorbent according to claim 1, which comprises 2-40 wt % of the ionic liquid;

5-50 wt % of the amine; and

30-70 wt % of the glycol.

3. The carbon dioxide absorbent according to claim 1, wherein the ionic liquid includes one or more ionic salts, the ionic salt each being capable of existing in liquid at 100°

C. or lower and comprising a cation and an anion, the cation being selected from the group consisting of dimethylimidazolium, ethylmethylimidazolium, diethylimidazolium, ethyldimethylimidazolium, butylmethylimidazolium, butylethylimidazolium, dibutylimidazolium, hexylmethylimidazolium, methylpyrrolidinium, dimethylpyrrolidinium, ethylmethylpyrrolidinium, methylpiperidinium, methylpiperidinium, methylmorpholinium, ethylmethylmorpholinium, N,N-dimethylformamidium, N,N-diethylformamidium, N,N-diisopropylformamidium, N,N-dibutylformamidium, N,N-dimethylacetamidium, N,N-diethylacetamidium, N,N-dimethylpropionamidium, N,N-dimethylbenzamidium, N,N-diethylbenzamidium, 1-formylpiperidinium and N-methylpyrrolidonium, and the anion being selected from the group consisting of methylphosphite, dimethylphosphate, ethylphosphite, diethylphosphate, butylphosphite, dibutylphosphate, methylsulfate, ethylsulfate, acetate, trifluoroacetate, propionate, butanoate, hexanoate, benzoate, hexafluorophosphate, tetrafluorophosphate and trifluoromethenesulfonate.

4. The carbon dioxide absorbent according to claim 1, wherein the amine is selected from the group consisting of monoethanolamine, diethanolamine, triethanolamine, methylmonoethanolamine, methyldiethanolamine, dimethylmonoethanolamine, diethylmonoethanolamine, monoisopropanolamine, diisopropanolamine, piperazine, 1-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, 2-diethylaminoethanol and mixtures thereof.

5. The carbon dioxide absorbent according to claim 1, wherein the glycol is selected from the group consisting of ethylene glycol, propylene glycol, diethylene glycol, triethylene glycol, dipropylene glycol, hexylene glycol, butylene glycol and mixtures thereof.

6. A process of absorbing carbon dioxide, comprising:

contacting a gas containing carbon dioxide with the carbon dioxide absorbent according to claim 1 at a temperature from about −

20 to 80°

C. under a pressure from about 1 to 100 atm;

degassing carbon dioxide at a temperature from about 20 to 120°

C. under a pressure from about 0.01 to 20 atm.