Sulfur dioxide absorbent is an ionic liquid including a salt of a diamine compound that is substituted with a hydroxyl group

Patent metadata

Field	Value
Publication number	US-10926213-B2
Application number	US-201916454566-A
Country	US
Kind code	B2
Filing date	Jun 27, 2019
Priority date	Nov 20, 2018
Publication date	Feb 23, 2021
Grant date	Feb 23, 2021

Abstract

A sulfur dioxide absorbent that is an ionic liquid including a solvent; and a salt of a diamine compound that is substituted with a hydroxyl group and has a chemical formula 1 to 3 below dissolved in the solvent:

where, in Chemical Formula 1 and 2, R 1 -R 4 are the same or different and each is independently selected from the group consisting of H, a C1-C6 alkyl, and a C1-C6 alkoxy; and where, in Chemical Formula 1 to 3, X is selected from the group consisting of Cl, Br, I, MeSO 3 , CF 3 SO 3 , HCO 2 , CF 3 CO 2 and CH 3 CO 2 ; and n is an integer of 1-10. The sulfur dioxide absorbent is constituted to selectively absorb sulfur dioxide and sulfurous acid (H 2 SO 3 ) formed by combination of sulfur dioxide with water, not CO 2 .

First claim

What is claimed is:

1. A sulfur dioxide absorbent that is an ionic liquid which absorbs sulfur dioxide and sulfurous acid (H 2 SO 3 ), comprising:
a solvent; and
a salt of a diamine compound that is substituted with a hydroxyl group, that has a chemical formula selected from the group consisting of Chemical Formula 1 to 3 below, and that is dissolved in the solvent:

where, in Chemical Formula 1 and 2, R 1 -R 4 are the same or different and each is independently selected from the group consisting of H, a C1-C6 alkyl group, and a C1-C6 alkoxy group; and
where, in Chemical Formula 1 to 3, X is selected from the group consisting of Cl, Br, I, MeSO 3 , CF 3 SO 3 , HCO 2 , CF 3 CO 2 and CH 3 CO 2 ; and
n is an integer of 1-10.

2. The sulfur dioxide absorbent according to claim 1 , wherein the sulfur dioxide absorbent selectively absorbs sulfur dioxide and sulfurous acid (H 2 SO 3 ) formed by combination of sulfur dioxide with water but not CO 2 .

3. The sulfur dioxide absorbent according to claim 1 , wherein the sulfur dioxide absorbent has an absorption temperature that ranges from 10-80° C.

4. The sulfur dioxide absorbent according to claim 1 , wherein the sulfur dioxide absorbent has a desorption temperature that ranges from 50-150° C.

5. The sulfur dioxide absorbent according to claim 1 , wherein the sulfur dioxide absorbent is selected from the group consisting of Chemical Formula 4 to 11 below:

6. The sulfur dioxide absorbent according to claim 1 , wherein the chemical formula is Chemical Formula 2.

7. The sulfur dioxide absorbent according to claim 1 , wherein the chemical formula is Chemical Formula 2 and X is Cl, Br, or I.

8. A sulfur dioxide absorbent that is an ionic liquid which absorbs sulfur dioxide and sulfurous acid (H 2 SO 3 ), comprising:
a solvent; and
a salt of a diamine compound that is substituted with a hydroxyl group, that has a chemical formula selected from the group consisting of Chemical Formula 1 to 3 below, and that is dissolved in the solvent:

where, in Chemical Formula 1 and 2, R 1 -R 4 are the same or different and each is independently selected from the group consisting of H, a C1-C6 alkyl group, and a C1-C6 alkoxy group; and
where, in Chemical Formula 1 to 3, X is selected from the group consisting of Cl, Br, I, CF 3 SO 3 , and CF 3 CO 2 ; and n is an integer of 1-10.

9. The sulfur dioxide absorbent according to claim 8 , wherein the sulfur dioxide absorbent is selected from the group consisting of Chemical Formula 4 to 7, 10, and 11 below:

10. The sulfur dioxide absorbent according to claim 8 , wherein the sulfur dioxide absorbent selectively absorbs sulfur dioxide and sulfurous acid (H 2 SO 3 ) formed by combination of sulfur dioxide with water but not CO 2 .

11. The sulfur dioxide absorbent according to claim 8 , wherein the sulfur dioxide absorbent has an absorption temperature that ranges from 10-80° C.

12. The sulfur dioxide absorbent according to claim 8 , wherein the sulfur dioxide absorbent has a desorption temperature that ranges from 50-150° C.

13. The sulfur dioxide absorbent according to claim 8 , wherein the chemical formula is Chemical Formula 2.

14. The sulfur dioxide absorbent according to claim 8 , wherein the chemical formula is Chemical Formula 2 and X is Cl, Br, or I.

15. A sulfur dioxide absorbent that is an ionic liquid which absorbs sulfur dioxide and sulfurous acid (H 2 SO 3 ), comprising:
a solvent; and
a salt of a diamine compound that is substituted with a hydroxyl group, that has Chemical Formula 2 below, and that is dissolved in the solvent:

where R 1 and R 2 are the same or different and each is independently selected from the group consisting of H, a C1-C6 alkyl group, and a C1-C6 alkoxy group, X is chlorine (Cl), and n is an integer of 1-10.

16. The sulfur dioxide absorbent according to claim 15 , wherein the sulfur dioxide absorbent selectively absorbs sulfur dioxide and sulfurous acid (H 2 SO 3 ) formed by combination of sulfur dioxide with water but not CO 2 .

17. The sulfur dioxide absorbent according to claim 15 , wherein the sulfur dioxide absorbent has an absorption temperature that ranges from 10-80° C.

18. The sulfur dioxide absorbent according to claim 15 , wherein the sulfur dioxide absorbent has a desorption temperature that ranges from 50-150° C.

Assignees

• Korea Inst Sci & Tech

Inventors

• Lee Hyun Joo
• Lee Ung
• Kim Hong Gon
• Cho Shinhye
• Lee He Won

Classifications

• B01D2252/20431

  Tertiary amines · CPC title

• Y02A50/20

  Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters · CPC title

• B01D2252/20484

  with one hydroxyl group · CPC title

• B01D53/1481

  Removing sulfur dioxide or sulfur trioxide · CPC title

• C07D487/08

  Bridged systems · CPC title