Absorbent for desulfurization of combustion gas and method of treating combustion gas using the same

Patent metadata

Field	Value
Publication number	US-9956519-B2
Application number	US-201414486122-A
Country	US
Kind code	B2
Filing date	Sep 15, 2014
Priority date	Oct 31, 2013
Publication date	May 1, 2018
Grant date	May 1, 2018

Abstract

An absorbent for desulfurization of combustion gas is provided. The absorbent includes about 1 to about 16 wt % of potassium carbonate (K 2 CO 3 ); about 0.1 to about 10 wt % of a promoting agent including hindered cyclic amine, hindered cyclic amine bicarbonate, or a combination thereof; and a balance amount of water. In addition, a method of treating the combustion gas using the absorbent is provided.

First claim

What is claimed is:

1. A method of treating combustion gas, comprising:
a denitrification process of removing nitrogen compounds from the combustion gas;
a collecting process of collecting the combustion gas obtained after removing the nitrogen compounds;
a desulfurization process of removing minor components including sulfur-containing compounds from the collected combustion gas by using an absorbent for desulfurization; and
a carbon dioxide capture process of capturing carbon dioxide using a carbon dioxide absorbent from the combustion gas obtained after removing the minor components,
wherein the absorbent for desulfurization includes 15 to 16 wt % of potassium carbonate (K 2 CO 3 ), 2 to 10 wt % of a promoting agent, and a balance amount of water, and wherein the promoting agent comprises hindered cyclic amine, hindered cyclic amine bicarbonate, or a combination thereof;
obtaining a carbon dioxide absorbent byproduct after the carbon dioxide capture process is performed for a predetermined period.

2. The method of claim 1 , wherein the hindered cyclic amine bicarbonate is selected from the group consisting of: 1-amino-4-methyl piperazinium bicarbonate, 1-(2-aminoethyl)-4-methyl piperazinium bicarbonate, 1-(2-hydroxyethyl)-4-methyl piperazinium bicarbonate, 1-(2-aminoethyl) piperazinium bicarbonate, 1-(2-hydroxyethyl) piperazinium bicarbonate, 2-aminoethyl piperazinium bicarbonate, 1-ethyl piperazinium bicarbonate, 2,5-dimethyl piperazinium bicarbonate, cis 2,6-dimethyl piperazinium bicarbonate, 1,4-dimethyl piperazinium bicarbonate, trans 2,5-dimethyl piperazinium bicarbonate, 1-methyl piperazinium bicarbonate, 2-methyl piperazinium bicarbonate, 1-ethyl piperazinium bicarbonate, 2-piperidinium ethanol bicarbonate, 3-piperidinium ethanol bicarbonate, 4-piperidinium ethanol bicarbonate, 2-aminoethyl-1-piperidinium bicarbonate, homopiperazinium bicarbonate, and a combination thereof.

3. The method of claim 1 , wherein the hindered cyclic amine is selected from the group consisting of: 1-amino-4-methyl piperazine, 1-(2-aminoethyl)-4-methyl piperazine, 1-(2-hydroxyethyl)-4-methyl piperazine, 1-(2-aminoethyl) piperazine, 1-(2-hydroxyethyl) piperazine, 2-aminoethyl piperazine, 1-ethyl piperazine, 2,5-dimethyl piperazine, cis 2,6-dimethyl piperazine, 1,4-dimethyl piperazine, trans 2,5-dimethyl piperazine, 1-methyl piperazine, 2-methyl piperazine, 1-ethyl piperazine, 2-piperidine ethanol, 3-piperidine ethanol, 4-piperidine ethanol, 2-aminoethyl-1-piperidine, homopiperazine, and a combination thereof.

4. The method of claim 1 , wherein the carbon dioxide absorbent comprises about 1 to about 16 wt % of a compound containing alkali metal; about 0.1 to about 10 wt % of hindered cyclic amine; and a balance amount of water;
wherein the compound containing alkali metal is selected from the group consisting of potassium carbonate (K 2 CO 3 ), sodium carbonate (Na 2 CO 3 ), sodium hydroxide (NaOH), potassium hydroxide (KOH), potassium bicarbonate (KHCO 3 ), sodium bicarbonate (NaHCO 3 ), and a combination thereof.

5. The method of claim 4 , wherein the hindered cyclic amine is selected from the group consisting of: 1-amino-4-methyl piperazine, 1-(2-aminoethyl)-4-methyl piperazine, 1-(2-hydroxyethyl)-4-methyl piperazine, 1-(2-aminoethyl) piperazine, 1-(2-hydroxyethyl) piperazine, 2-aminoethyl piperazine, 1-ethyl piperazine, 2,5-dimethyl piperazine, cis 2,6-dimethyl piperazine, 1,4-dimethyl piperazine, trans 2,5-dimethyl piperazine, 1-methyl piperazine, 2-methyl piperazine, 1-ethyl piperazine, 2-piperidine ethanol, 3-piperidine ethanol, 4-piperidine ethanol, 2-aminoethyl-1-piperidine, homopiperazine, and a combination thereof.

Assignees

• Hyundai Motor Co Ltd
• Kia Motors Corp
• Korea Inst Energy Res

Inventors

• Bae Shin-Tae
• Yoon Yeoil
• Nam Sungchan
• Jeong Soonkwan
• Park Sungyeoul
• Chun Ilsoo
• Kim Youngeun

Classifications

• B01D2251/606

  Carbonates · CPC title

• B01D2257/504

  Carbon dioxide · CPC title

• Y02C10/04

  Cross-Sectional Technologies · mapped topic

• B01D2252/20447

  containing a piperazine-ring · CPC title

• F23J2215/10

  Nitrogen; Compounds thereof · CPC title