Catalytic CO2 desorption for ethanolamine based CO2 capture technologies

Patent metadata

Field	Value
Publication number	US-9579602-B2
Application number	US-201514632974-A
Country	US
Kind code	B2
Filing date	Feb 26, 2015
Priority date	Feb 26, 2015
Publication date	Feb 28, 2017
Grant date	Feb 28, 2017

Abstract

Embodiments described herein generally relate to apparatus and methods for reducing CO 2 from flue gas. Methods may include performing a chemisorption process in a first reactor comprising using at least a chemisorption solution comprising a sorbent. Methods may also include performing a desorption process treating the chemisorption solution with a powdered desorption catalyst after the chemisorption process has been performed.

First claim

The invention claimed is:

1. A method of reducing CO 2 from flue gas, comprising:
performing a chemisorption process in a first reactor comprising using at least a chemisorption solution comprising a sorbent; and
performing a desorption process by treating the chemisorption solution with a powdered desorption catalyst after the chemisorption process is performed, wherein the powdered desorption catalyst is of the formula MZ v , wherein M is selected from the group consisting of Ti, Zr, and Hf, wherein Z is selected from the group consisting of —SO 4 , —F, —Cl, —Br, and —I, and wherein v is a numeral from 1 to 4.

2. The method of claim 1 , wherein the desorption
process further comprises:
introducing a carrier gas into the first reactor, wherein the carrier gas is selected from the group consisting of N 2 , He, H 2 , CO 2 , Argon and mixtures thereof.

3. The method of claim 2 , wherein the flow rate of the carrier gas is about 10,000 m 3 /min to about 20,000 m 3 /min.

4. The method of claim 2 , wherein the carrier gas is N 2 or H 2 .

5. The method of claim 1 , wherein the sorbent comprises an alkanolamine selected from the group consisting of monoethanolamine (MEA), diethanolamine (DEA), diisopropanolamine (DIPA), N-methylethanolamine, triethanolamine (TEA), N-methyldiethanolamine (MDEA), piperazine, N-methylpiperazine (MP), N-hydroxyethylpiperazine (HEP), 2-amino-2-methyl-1-propanol (AMP), 2-(2-aminoethoxy)ethanol, 2-(2-tert-butylaminopropoxy)ethanol, 2-(2-tert-butylaminoethoxy)ethanol (TBEE), 2-(2-tert-amylaminoethoxy)ethanol, 2-(2-isopropylaminopropoxy)ethanol, or 2-(2-(1-methyl-1-ethylpropylamino)ethoxy)ethanol, or mixtures thereof.

6. The method of claim 5 , wherein the alkanolamine is monoethanolamine (MEA).

7. The method of claim 1 , wherein the desorption process is performed at a temperature of about 35° C. to about 75° C.

8. The method of claim 1 , wherein the desorption process is performed with a mechanical stirrer at a stirring rate of about 500 rpm to about 700 rpm.

9. The method of claim 1 , wherein the desorption process is performed in a second reactor.

10. A method of reducing CO 2 from flue gas, comprising:
performing a chemisorption process in a first reactor comprising using at least a chemisorption solution comprising a sorbent, wherein the chemisorption process is performed at ambient temperature; and
performing a desorption process in a second reactor by treating the chemisorption solution with a powdered desorption catalyst, wherein the powdered desorption catalyst is of the formula MZ v , wherein M is selected from the group consisting of Ti, Zr, and Hf, wherein Z is selected from the group consisting of —SO 4 , —F, —Cl, —Br, and —I, and wherein v is a numeral from 1 to 4, and wherein the desorption process is performed at a temperature from about 35° C. to about 75° C.

Assignees

• Univ Wyoming

Inventors

• Fan Maohong
• Tuwati Abdulwahab
• Assiri Mohammed

Classifications

• B01D53/8671 Primary

  Removing components of defined structure not provided for in B01D53/8603 - B01D53/8668 · CPC title

• B01D2258/0283

  Flue gases · CPC title

• B01D53/1475

  Removing carbon dioxide · CPC title

• B01D53/1425 Primary

  Regeneration of liquid absorbents · CPC title

• B01D2252/20484

  with one hydroxyl group · CPC title