Regenerable solvent mixtures for acid-gas separation

Patent metadata

Field	Value
Publication number	US-12427471-B2
Application number	US-202218087359-A
Country	US
Kind code	B2
Filing date	Dec 22, 2022
Priority date	Mar 2, 2012
Publication date	Sep 30, 2025
Grant date	Sep 30, 2025

Abstract

A solvent system for the removal of acid gases from mixed gas streams is provided. Also provided is a process for removing acid gases from mixed gas streams using the disclosed solvent systems. The solvent systems may be utilized within a gas processing system.

First claim

The invention claimed is:

1. A solvent system for the removal of SO 2 from gas stream, consisting of:
a nucleophilic amine,
wherein the nucleophilic amine has a structure such that it reacts with
SO 2 to form a Zwitterionic sulfamic acid;

one or more Zwitterionic sulfamic acid reaction;
optionally, water in an amount of less than about 10 weight percent; and
optionally, one or more unreacted components of the gas stream.

2. The solvent system of claim 1 , wherein the nucleophilic amine is 3-fluoro-N-methylbenzylamine.

3. The solvent system of claim 1 , wherein the nucleophilic amine is hydrophobic.

4. The solvent system of claim 1 , wherein the solvent system is substantially immiscible with water.

5. The solvent system of claim 1 , wherein the solvent system has a solubility with water of less than about 20 g of solvent per 100 mL of water.

6. A process for the removal of SO 2 from a gas stream, comprising contacting the gas stream with the solvent system of claim 1 .

7. The process of claim 6 , wherein the solvent system tolerates water up to or equal to about 20% water by volume with no degradation of solvent performance.

8. The process of claim 6 , further comprising withdrawing a reaction product-rich solvent and a reaction component-lean gas stream.

9. The process of claim 8 , further comprising regenerating the reaction product-rich solvent by applying heat to form a regenerated solvent comprising a lower content of the one or more reaction products than present in the reaction product-rich solvent.

10. The process of claim 9 , wherein the applied heat is derived from a source selected from the group consisting of low-pressure steam, hot flue gas, or a combination thereof.

11. A solvent system for the removal of CO 2 and/or SO 2 from a gas stream, consisting of:
3-fluoro-N-methylbenzylamine;
one or more reaction products of the 3-fluoro-N-methylbenzylamine and the CO 2 and/or SO 2 ;
optionally, water in an amount of less than about 10 weight percent; and
optionally, one or more unreacted components of the gas stream.

12. A process for the removal of CO 2 and/or SO 2 from a gas stream, comprising contacting the gas stream with the solvent system of claim 11 .

13. The process of claim 12 , wherein the solvent system tolerates water up to or equal to about 20% water by volume with no degradation of solvent performance.

Assignees

• Res Triangle Inst

Inventors

• Lail Marty
• Coleman Luke

Classifications

• B01D2258/0283

  Flue gases · CPC title

• B01D2257/504

  Carbon dioxide · CPC title

• B01D2257/404

  Nitrogen oxides other than dinitrogen oxide · CPC title

• B01D2257/308

  Carbonoxysulfide COS · CPC title

• B01D2257/302

  Sulfur oxides · CPC title