Diamine having tert-alkylamino group and primary amino group for use in gas scrubbing

Patent metadata

Field	Value
Publication number	US-10214482-B2
Application number	US-201515506472-A
Country	US
Kind code	B2
Filing date	Aug 20, 2015
Priority date	Aug 25, 2014
Publication date	Feb 26, 2019
Grant date	Feb 26, 2019

Abstract

A compound of the general formula (I)

in which R 1 , R 2 and R 3 are independently selected from C 1-4 -alkyl and C 1-4 -hydroxyalkyl; each R 4 is independently selected from hydrogen, C 1-4 -alkyl and C 1-4 -hydroxyalkyl; each R 5 is independently selected from hydrogen, C 1-4 -alkyl and C 1-4 -hydroxyalkyl; m is 2, 3, 4 or 5; n is 2, 3, 4 or 5; and o is an integer from 0 to 10. A preferred compound of the formula (I) is 2-(2-tert-butylaminoethoxy)ethylamine. Absorbents comprising a compound of the formula (I) have rapid absorption of carbon dioxide from fluid streams and are also suitable for processes for the simultaneous removal of H 2 S and CO 2 , where given H 2 S limits have to be observed but complete removal of CO 2 is not required.

First claim

The invention claimed is:

1. An absorbent for removing carbon dioxide and/or hydrogen sulfide from fluid streams, comprising an aqueous solution of a compound of the general formula (I)

in which R 1 and R 3 are each independently selected from C 1-4 -alkyl and C 1-4 -hydroxyalkyl;
each R 4 is independently selected from hydrogen, C 1-4 -alkyl and C 1-4 -hydroxyalkyl;

each R 5 is independently selected from hydrogen, C 1-4 -alkyl and C 1-4 -hydroxyalkyl;
m is 2, 3, 4 or 5;
n is 2, 3, 4 or 5; and
o is an integer from 1 to 10.

2. The absorbent according to claim 1 , with the proviso that the R 5 radical on the carbon atom bonded directly to the primary amino group is hydrogen.

3. The absorbent according to claim 1 , wherein the absorbent comprises at least one organic solvent.

4. The absorbent according to claim 1 , wherein the absorbent comprises at least one acid.

5. The absorbent according to claim 1 , wherein the concentration of the compound of the formula (I) in the absorbent is 10% to 60% by weight.

6. The absorbent according to claim 1 , also comprising at least one tertiary amine and/or a sterically hindered primary or secondary amine.

7. The absorbent according to claim 6 , wherein the tertiary amine is methyldiethanolamine.

8. A process for removing carbon dioxide and/or hydrogen sulfide from fluid streams, the process comprising:
contacting an absorbent according to claim 1 with a fluid stream, to obtain a CO 2 - and H 2 S-depleted fluid stream and a CO 2 - and H 2 S-laden absorbent.

9. The process according to claim 8 , wherein the fluid stream comprises at least one hydrocarbon.

10. The process according to claim 8 , wherein the fluid stream has a total pressure of at least 3.0 bar.

11. The process according to claim 8 ,
further comprising: regenerating the CO 2 - and H 2 S-laden absorbent,
wherein said regenerating comprises at least one of heating, decompressing and stripping the absorbent with an inert fluid.

12. A compound of the general formula (Ia)

in which R 1 , R 2 and R 3 are each independently selected from C 1-4 -alkyl and C 1-4 -hydroxyalkyl;
each R 4 is independently selected from hydrogen, C 1-4 -alkyl and C 1-4 -hydroxyalkyl;
each R 5 is independently selected from hydrogen, C 1-4 -alkyl and C 1-4 -hydroxyalkyl; and
m is 2, 3, 4 or 5.

13. The compound according to claim 12 , with the proviso that the R 5 radical on the carbon atom bonded directly to the primary amino group is hydrogen.

14. The compound according to claim 13 , which is 2-(2-tert-butylaminoethoxy)ethylamine.

Assignees

• Basf Se

Inventors

• Ingram Thomas
• Da Silva Marion
• Sieder Georg

Classifications

• B01D53/1425 Primary

  Regeneration of liquid absorbents · CPC title

• B01D2258/025

  from metallurgy plants · CPC title

• B01D2257/306

  Organic sulfur compounds, e.g. mercaptans · CPC title

• B01J31/189

  containing both nitrogen and phosphorus as complexing atoms, including e.g. phosphino moieties, in one at least bidentate or bridging ligand · CPC title

• B01D2252/20452

  containing a morpholine-ring · CPC title