Systems, devices, compositions, and/or methods for de-sulphurizing acid gases
Certain exemplary embodiments can provide a system, machine, device, manufacture, circuit, composition of matter, and/or user interface adapted for and/or resulting from, and/or a method and/or machine-readable medium comprising machine-implementable instructions for, activities that can comprise and/or relate to, reacting reactants comprising a ferric/ferrous chelate and a sour gas stream.
1. A method comprising:
in a substantially anaerobic treatment zone of a manmade container, reacting reactants comprising a ferric/ferrous chelate and an input gas stream, the input gas stream comprising natural gas and hydrogen sulfide, wherein:
reaction products of the reacting comprise:
a spent ferric/ferrous chelate that is substantially saturated with sulfide; and
an output gas stream having a concentration of hydrogen sulfide of no greater than 3.5 ppm;
a content of the treatment zone is actively maintained at a pH of between approximately 5.55 and approximately 9.25 and an oxidation-reduction potential of between approximately −31 mV and approximately −425 mV.
2. The method of claim 1 , further comprising converting the sulfide to elemental sulfur.
3. The method of claim 1 , further comprising removing elemental sulfur from an oxidation container.
4. The method of claim 1 , further comprising, via a predetermined reactivation composition comprising a predetermined oxidant, re-activating the spent ferric/ferrous chelate.
5. The method of claim 1 , further comprising re-activating the spent ferric/ferrous chelate using a reactivation composition comprising sodium percarbonate.
6. The method of claim 1 , further comprising re-activating the spent ferric/ferrous chelate using a reactivation composition comprising one or more chlorite species.
7. The method of claim 1 , further comprising re-activating the spent ferric/ferrous chelate using a reactivation composition comprising sodium chlorite.
8. The method of claim 1 , further comprising re-activating the spent ferric/ferrous chelate using a reactivation composition comprising one or more peroxide species.
9. The method of claim 1 , further comprising re-activating the spent ferric/ferrous chelate using a reactivation composition comprising hydrogen peroxide.
10. The method of claim 1 , further comprising re-activating the spent ferric/ferrous chelate using a reactivation composition comprising one or more nitrate species.
11. The method of claim 1 , further comprising re-activating the spent ferric/ferrous chelate using a reactivation composition comprising one or more permanganate species.
12. The method of claim 1 , further comprising re-activating the spent ferric/ferrous chelate using a reactivation composition comprising one or more persulfate species.
13. The method of claim 1 , further comprising re-activating the spent ferric/ferrous chelate using a reactivation composition comprising ozone.
14. The method of claim 1 , further comprising re-activating the spent ferric/ferrous chelate using a reactivation composition comprising one or more chlorate species.
15. The method of claim 1 , further comprising re-activating the spent ferric/ferrous chelate using a reactivation composition comprising one or more perchlorate species.
16. The method of claim 1 , further comprising re-activating the spent ferric/ferrous chelate using a reactivation composition comprising one or more perborate species.
17. The method of claim 1 , further comprising re-activating the spent ferric/ferrous chelate using a reactivation composition comprising nitrous oxide.
18. The method of claim 1 , further comprising re-activating the spent ferric/ferrous chelate using a reactivation composition comprising one or more reactivators selected from 2,2 dipyridyldisulfide, peroxydisulfuric acid and peroxymonosulfuric acid.
19. The method of claim 1 , wherein the ferric/ferrous chelate comprises ferric/ferrous methylglycinediacetate (MGDA) configured with approximately one iron molecule for every five available MGDA chelate ligands.
20. The method of claim 1 , wherein the content of the treatment zone is actively maintained at a pH of between approximately 6.3 and approximately 9.0.
21. The method of claim 1 , wherein the content of the treatment zone is actively maintained at a pH of between approximately 7 and approximately 8.
22. The method of claim 1 , wherein the content of the treatment zone is actively maintained at an oxidation-reduction potential of between approximately −150 mV and approximately −325 mV.
23. The method of claim 1 , wherein the content of the treatment zone is actively maintained at an oxidation-reduction potential of between approximately −131 mV and approximately −425 mV.
24. The method of claim 1 , wherein the reactants comprise malodorous sulfonated organic compounds.