Reducing acid gases from streams

Patent metadata

Field	Value
Publication number	US-11845038-B2
Application number	US-202217890466-A
Country	US
Kind code	B2
Filing date	Aug 18, 2022
Priority date	Sep 2, 2016
Publication date	Dec 19, 2023
Grant date	Dec 19, 2023

Abstract

Methods of reducing acid gas from a stream, comprising contacting the stream with a solvent system comprising a glycerol derivative are described herein. Disclosed herein is a composition comprising a glycerol derivative and an acid gas. A method for sweetening a natural gas stream comprising contacting a solvent system comprising a glycerol derivative with a natural gas stream is described herein.

First claim

What is claimed is:

1. A solvent system for reducing acid gas from a stream, the solvent system comprising a glycerol derivative and an acid gas, wherein the glycerol derivative has the following structure:

wherein
R 1 , R 2 , and R 3 are independently selected from the group consisting of C 1-20 alkyl, C 2-20 alkenyl, C 2-20 alkynyl, cycloalkyl, aryl, thio, alkoxyl, aryloxyl C 2-20 fluoroalkyl, C 2 -C 20 trifluoromethyl terminated alkyl, and C 2-20 nitrile terminated alkyl, any of which is optionally substituted with one or more substituents selected from the group consisting of ether, C 1 -C 5 alkyl, halogen, amine, and C 1 -C 5 alkoxy;
with the proviso that at least one of R 1 , R 2 , and R 3 is not C(O)CH 3 .

2. The solvent system of claim 1 , wherein R 1 , R 2 , and R 3 are independently selected from the group consisting of C 1-20 alkyl, alkoxy, and C 2 -C 20 trifluoromethyl terminated alkyl, any of which is optionally substituted with one or more substituents selected from the group consisting of ether, C 1 -C 5 alkyl, halogen, amine, and C 1 -C 5 alkoxy.

3. The solvent system of claim 1 , wherein R 1 , R 2 , and R 3 are independently selected from the group consisting of unsubstituted C 1-20 alkyl, unsubstituted C 2-20 alkenyl, unsubstituted C 2-20 alkynyl, unsubstituted cycloalkyl, unsubstituted aryl, unsubstituted thio, unsubstituted alkoxyl, unsubstituted aryloxyl, unsubstituted C 2-20 fluoroalkyl, unsubstituted C 2 -C 20 trifluoromethyl terminated alkyl, and unsubstituted C 2-20 nitrile terminated alkyl.

4. The solvent system of claim 1 , wherein R 1 , R 2 and R 3 are independently selected from the group consisting of unsubstituted C 1-20 alkyl, unsubstituted alkoxy, and unsubstituted C 2 -C 20 trifluoromethyl terminated alkyl.

5. The solvent system of claim 1 , wherein R 1 , R 2 , and R 3 are independently selected from the group consisting of —CH 3 , —CH 2 CH 3 , —CH 2 CF 3 , and —CH 2 CH 2 OCH 3 .

6. The solvent system of claim 1 , wherein R 1 , R 2 , R 3 are not all the same.

7. The solvent system of claim 1 , wherein the glycerol derivative is selected from the group consisting of 1,2,3-trimethoxypropane, 1,2,3-triethoxypropane and 1,2,3-tris(2,2,2-trifluoroethoxy)propane.

8. The solvent system of claim 1 , wherein the glycerol derivative has a viscosity that is at or below 5 cP at 25° C.

9. The solvent system of claim 1 , wherein the acid gas is selected from the group consisting of carbon dioxide, sulfur dioxide, hydrogen sulfide, and mixtures thereof.

10. The solvent system of claim 1 , wherein the stream is selected from the group consisting of natural gas, byproducts of a chemical reaction, and post-combustion flue gas.

11. The solvent system of claim 1 , wherein the stream comprises gaseous products produced from a water-gas shift reaction.

12. The solvent system of claim 1 , wherein the solvent system comprises at least 50% of the glycerol derivative by volume.

Assignees

• Univ Alabama

Inventors

• Bara Jason E
• Flowers Brian
• Mittenthal Max

Classifications

• B01D53/1493 Primary

  Selection of liquid materials for use as absorbents · CPC title

• B01D11/00

  Solvent extraction · CPC title

• B01D11/04

  of solutions which are liquid · CPC title

• B01D53/00

  Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols, (recovery of volatile solvents by condensation B01D5/00; sublimation B01D7/00; cold traps, cold baffles B01D8/00; working-up undefined gaseous mixtures obtained by cracking hydrocarbon oils C10G70/00; cleaning coal gas C10K; working-up of natural gas, or synthetic natural gas, C10L3/10; separation of difficult-to-condense gases or air by liquefaction F25J; for investigating materials G01N30/00) · CPC title

• B01D53/1462

  Removing mixtures of hydrogen sulfide and carbon dioxide · CPC title