Acidic gas absorbent, acidic gas removal method and acidic gas removal apparatus

Patent metadata

Field	Value
Publication number	US-10835858-B2
Application number	US-201916297141-A
Country	US
Kind code	B2
Filing date	Mar 8, 2019
Priority date	Sep 18, 2018
Publication date	Nov 17, 2020
Grant date	Nov 17, 2020

Abstract

The embodiments provide an acidic gas absorbent, an acidic gas removal method, and an acidic gas removal apparatus. The absorbent absorbs an acidic gas in a large amount and hardly diffuses in air. The acidic gas absorbent according to the embodiment comprises an amine compound having a sulfonyl group and two or more amino groups.

First claim

The invention claimed is:

1. An acidic gas absorbent comprising:
an aliphatic amine compound having a sulfonyl group and two or more amino groups, and
a solvent,
wherein the acidic gas absorbent comprises the aliphatic amine compound in an amount of 10 to 60 wt %.

2. The acidic gas absorbent according to claim 1 wherein said aliphatic amine compound is represented by one of the following formulas:

in which
each R′ is independently hydrogen, an unsubstituted alkyl group, sulfonyl, carbonyl, amino, carbonyl or a hydroxy-substituted alkyl group; and
n′ is an integer of 2 to 4.

3. The acidic gas absorbent according to claim 1 , further comprising an aminoalcohol or a piperazine derative.

4. The acidic gas absorbent according to claim 1 , further comprising at least one additive agent selected from the group consisting of oxidation inhibitors, pH adjusters, defoaming agents, and anticorrosive agents.

5. The acidic gas absorbent according to claim 1 , wherein the solvent is water.

6. The acidic gas absorbent according to claim 1 , wherein an amount of the solvent is 20 to 60 wt %, based on a total amount of 100 wt % of the acidic gas absorbent.

7. The acidic gas absorbent according to claim 1 , wherein said aliphatic amine compound is represented by the following formula (1a) or (1b):

in which
each R is independently hydrogen, an usubstituted alkyl group, sulfonyl, carbonyl, amino, carbonyl or a hydroxy-substituted alkyl group
provided that two of Rs may be linked to form a cyclic structure; and
each n is independently an integer of 1 to 4.

8. The acidic gas absorbent according to claim 7 , wherein said unsubstituted or hydroxy-substituted alkyl group contains 1 to 4 carbon atoms.

9. The acidic gas absorbent according to claim 7 , wherein said integer represented by n is 1 to 3.

10. An acidic gas removal method in which
a gas containing an acidic gas is brought into contact with the acidic gas absorbent according to claim 1 so as to remove the acidic gas from the acidic gas-containing gas.

11. An acidic gas removal apparatus comprising:
an absorption unit in which a gas containing an acidic gas is brought into contact with the acidic gas absorbent according to claim 1 , so that the absorbent absorbs the acidic gas to remove it from the acidic gas-containing gas; and
a regeneration unit in which the absorbent holding the acidic gas is made to desorb the acidic gas so as to be regenerated;
so that the absorbent regenerated in the regeneration unit is reused in the absorption unit.

Assignees

• Toshiba Kk
• Toshiba Energy Systems & Solutions Corp

Inventors

• Nakano Yoshihiko
• Suzuki Akiko
• Kuboki Takashi
• Imada Toshihiro
• Murai Shinji
• Yoshimura Reiko
• Sano Kenji
• Udatsu Mitsuru

Classifications

• B01D2252/2041

  Diamines · CPC title

• B01D2257/504

  Carbon dioxide · CPC title

• B01D2252/20447

  containing a piperazine-ring · CPC title

• B01D53/1462

  Removing mixtures of hydrogen sulfide and carbon dioxide · CPC title

• B01D2252/20405

  Monoamines · CPC title