Process for removal of acid gases from a fluid stream

Patent metadata

Field	Value
Publication number	US-11173446-B2
Application number	US-201816484860-A
Country	US
Kind code	B2
Filing date	Feb 9, 2018
Priority date	Feb 10, 2017
Publication date	Nov 16, 2021
Grant date	Nov 16, 2021

Abstract

In a process for removal of acid gases from a fluid stream the fluid stream is contacted with an absorbent to obtain a treated fluid stream and a laden absorbent. The absorbent comprises a diluent and a compound of the general formula (I) wherein R1 is C1-C3-alkyl; R2 is C1-C3-alkyl; R3 is selected from hydrogen and C1-C3-alkyl; and R4 is selected from hydrogen and C1-C3-alkyl.

First claim

The invention claimed is:

1. A process for removing acid gases from a fluid stream, wherein the fluid stream is contacted with an absorbent obtain a treated fluid stream and a laden absorbent, the absorbent comprising at least one diluent and a compound of the general formula (I)

wherein R 1 is C 1 -C 3 -alkyl; R 2 is C 1 -C 3 -alkyl; R 3 is selected from hydrogen and C 1 -C 3 -alkyl; and R 4 is selected from hydrogen and C 1 -C 3 -alkyl.

2. The process according to claim 1 , wherein R 3 is C 1 -C 3 -alkyl.

3. The process according to claim 1 , wherein the compound of the general formula (I) is selected from 3-(tert-butylamino)propane-1,2-diol, 1-(tert-butylamino)-3-methoxy-propane-2-ol, 3-(iso-propylamino)propane-1,2-diol, and 3-[(2-methylbutan-2-yl)amino]propane-1,2-diol.

4. The process according to claim 1 , wherein the diluent comprises water.

5. The process according to claim 4 , wherein the absorbent additionally comprises an acid.

6. The process according to claim 1 , wherein the diluent comprises a non-aqueous organic solvent.

7. The process according to claim 6 , wherein the organic solvent is selected from C 4-10 alcohols, ketones, esters, lactones, amides, lactams, sulfones, sulfoxides, glycols, polyalkylene glycols, di- or mono(C 1-4 -alkyl ether)glycols, di- or mono(C 1-4 -alkyl ether) polyalkylene glycols, cyclic ureas, thioalkanols and mixtures thereof.

8. The process according to claim 1 , wherein the absorbent comprises at least one activator selected from a sterically unhindered primary amine and/or a sterically unhindered secondary amine.

9. The process according to claim 8 , wherein the activator is piperazine.

10. The process according to claim 1 , for selective removal of hydrogen sulfide from a fluid stream comprising carbon dioxide and hydrogen sulfide.

11. The process according to claim 1 , wherein the laden absorbent is regenerated by means of at least one of the measures of heating, decompressing and stripping with an inert fluid.

Assignees

• Basf Se
• Exxonmobil Res & Eng Co

Inventors

• Ingram Thomas
• Ernst Martin
• Vorberg Gerald
• Panchenko Alexander
• Ebert Sophia
• Holcombe Thomas Wesley
• Siskin Michael
• Pereira Carla
• Sieder Georg

Classifications

• B01D53/1468

  Removing hydrogen sulfide · CPC title

• B01D2252/20489

  with two or more hydroxyl groups · CPC title

• B01D53/78

  with gas-liquid contact · CPC title

• B01D2252/20405

  Monoamines · CPC title

• B01D2252/20447

  containing a piperazine-ring · CPC title