US 12,128,349 B2
Method and a system for abating H2S and CO2 from H2S and CO2 rich gas mixtures such as geothermal non-condensable gas mixtures
Sigfússon Bergur, Reykjavík (IS); Arnarson Þór Magnús, Reykjavik (IS); Gunnarsson ngvi, Reykjavik (IS); Gunnarsson Teitur, Reykjavik (IS); and Einarsson Garðar Jóhann, Garðabær (IS)
Assigned to Carbfix (Reykjavik, IS), (IS)
Appl. No. 17/753,688
Filed by CARBFIX [IS]/[IS], Reykjavik (IS)
PCT Filed Sep. 17, 2020, PCT No. PCT/EP2020/076005
§ 371(c)(1), (2) Date Aug. 2, 2022,
PCT Pub. No. WO2021/053084, PCT Pub. Date Mar. 25, 2021.
Claims priority of application No. 19197831 (EP), filed on Sep. 17, 2019.
Prior Publication US 2022/0339576 A1, Oct. 27, 2022
Int. Cl. E21B 43/40 (2006.01); B01D 53/14 (2006.01); B01D 53/52 (2006.01); E21B 41/00 (2006.01)
CPC B01D 53/1462 (2013.01) [B01D 53/526 (2013.01); E21B 41/0057 (2013.01); E21B 43/40 (2013.01); B01D 2257/304 (2013.01); B01D 2257/504 (2013.01); B01D 2258/02 (2013.01)] 26 Claims
OG exemplary drawing
 
1. A method for abating at least part of hydrogen sulfide (H2S) and at least 50% of carbon dioxide (CO2) present in a Non-Condensable gas (NCG) mixture (G1), encompassing H2S and CO2 and at least also one of H2, N2, CH4 and/or Ar, comprising the steps of:
pressurizing said NCG mixture (G1), encompassing H2S and CO2 and at least also one of H2, N2, CH4 and/or Ar, to a pressure between 6 and 20 bar, and
contacting a stream of said pressurized NCG mixture (G1), encompassing H2S and CO2 and at least also one of H2, N2, CH4 and/or Ar, with a stream of water (W2) having a pressure between 6 and 23 bar, wherein a flow ratio, as measured in kg/s, of the stream of water (W2) to the stream of gas mixture (G1) is from 36:1.5 to 56:0.2,
absorption of at least part of said H2S and at least 50% of said CO2 from said pressurized NCG mixture (G1), encompassing H2S and CO2 and at least also one of H2, N2, CH4 and/or Ar, into said water stream (W2), thereby
separating said at least part of said H2S and at least 50% of said CO2 from at least part of said at least also one of H2, N2, CH4 and/or Ar and producing a stream of water (W4) enriched with dissolved H2S and CO2 comparable to said water stream (W2) and a stream of pressurized gas (G3), which has been depleted of at least part of the H2S and at least 50% of the CO2 compared to said NCG mixture (G1), encompassing H2S and CO2 and at least also one of H2, N2, CH4 and/or Ar,
transferring said water stream (W4) enriched with dissolved H2S and CO2:
either to an injection well for injecting said water stream (W4) into a geological reservoir, or
to a system for injection of a water stream (W5) into a geological reservoir for use of said water stream (W4) as an aid for pH-regulation of said water stream (W5).