Process for removal of hydrogen sulfide in downhole oilfield application
A method and system remove hydrogen sulfide from a sour liquid. In an embodiment, the method for removing hydrogen sulfide from a hydrocarbon containing fluid includes contacting a methylmorpholine-N-oxide solution with the sour liquid. The method also includes allowing the methylmorpholine-N-oxide to react with the hydrogen sulfide to remove the hydrogen sulfide.
1. A method for removing hydrogen sulfide from a gas containing hydrogen sulfide comprises:
(A) contacting a methylmorpholine-N-oxide solution with the gas containing hydrogen sulfide; and
(B) allowing the methylmorpholine-N-oxide to react with the hydrogen sulfide to remove the hydrogen sulfide.
2. The method of claim 1 , wherein the methylmorpholine-N-oxide solution comprises methylmorpholine-N-oxide and water.
3. The method of claim 1 , wherein the methylmorpholine-N-oxide solution comprises between about 1.0 wt. % methylmorpholine-N-oxide solution and about 60.0 wt. % methylmorpholine-N-oxide solution.
4. The method of claim 1 , wherein the methylmorpholine-N-oxide reacts with the hydrogen sulfide in the presence of iron.
5. The method of claim 4 , wherein the iron comprises a hydrated rust, a hydrated ferrous salt, or any combinations thereof.
6. The method of claim 1 , further comprising adding heat to the methylmorpholine-N-oxide solution.
7. The method of claim 6 , wherein the heat is provided by subterranean heat.
8. The method of claim 6 , wherein adding heat comprises increasing the temperature of the methylmorpholine-N-oxide solution to a temperature between about 40° C. and about 75° C.
9. The method of claim 1 , wherein the methylmorpholine-N-oxide solution is exposed to the gas containing hydrogen sulfide from about 24 hours to about 48 hours.
10. The method of claim 1 , wherein the methylmorpholine-N-oxide solution comprises additives, wherein the additives comprise surfactants, pH adjustment chemicals, dyes, or any combinations thereof.
11. The method of claim 1 , wherein the gas containing hydrogen sulfide comprises natural gas.
12. The method of claim 1 , wherein the hydrogen sulfide is removed by oxidation.
13. The method of claim 12 , wherein oxidation of the hydrogen sulfide produces elemental sulfur.
14. The method of claim 13 , further comprising treating the elemental sulfur.
15. The method of claim 1 , further comprising a mole ratio of methylmorpholine-N-oxide to hydrogen sulfide between about 1:1 and about 5:1.
16. The method of claim 1 , further comprising a mole ratio of methylmorpholine-N-oxide to hydrogen sulfide between about 1:1 and about 3:1.
17. The method of claim 1 , further comprising a mole ratio of methylmorpholine-N-oxide to hydrogen sulfide of about 2:1.
18. The method of claim 1 , wherein adding the methylmorpholine-N-oxide solution to the gas containing hydrogen sulfide comprises injecting the methylmorpholine-N-oxide solution downhole.
19. The method of claim 18 , wherein the injecting comprises injecting the methylmorpholine-N-oxide solution with steam.
20. The method of claim 19 , wherein the steam is a 150 psig steam or less.