Process for removal of acid gases from a fluid stream
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 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.
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.