Decontamination of sulfur contaminants from a vessel

1. A method for removing hydrogen sulfide, comprising:

(A) introducing a methylmorpholine-N-oxide solution to a vessel, wherein the vessel comprises a water layer and a gas layer, wherein the water layer and the gas layer comprise the hydrogen sulfide;

(B) introducing methylmorpholine-N-oxide into the gas layer; wherein the methylmorpholine-N-oxide comprises between about 0.01 weight volume % and about 60 weight volume % methylmorpholine-N-oxide of the gas layer;

(C) introducing steam to the vessel, wherein steam removes at least a portion of the hydrogen sulfide from the water layer;

(D) allowing the steam comprising at least a portion of hydrogen sulfide from the water layer to evaporate into the gas layer;

(E) adjusting a hydrogen sulfide rate of evaporation by increasing the vessel temperature;

(F) treating the gas layer by allowing the methylmorpholine-N-oxide to react with the hydrogen sulfide; and

(G) treating the water layer by reducing the temperature of the gas layer to a temperature below the boiling point of methylmorpholine-N-oxide to condense the methylmorpholine-N-oxide into the water layer.

2. The method of claim 1 , further comprising allowing the hydrogen sulfide in the water layer to react with the methylmorpholine-N-oxide.

3. The method of claim 1 , wherein the treating the water layer comprises converting the hydrogen sulfide to elemental sulfur.

4. The method of claim 3 , wherein the elemental sulfur is removed from the vessel.

5. The method of claim 1 , wherein the methylmorpholine-N-oxide solution is introduced to the gas layer in an amount to provide a mole ratio of methylmorpholine-N-oxide to hydrogen sulfide in the vessel from about 1.0 mole methylmorpholine-N-oxide:1.0 mole hydrogen sulfide to about 3.0 moles methylmorpholine-N-oxide:1.0 mole hydrogen sulfide.

6. The method of claim 1 , further comprising introducing the steam to the vessel to increase a temperature of the gas layer to a temperature from about 234° F. to about 250° F.

7. The method of claim 1 , further comprising recirculating between about one volume of the water layer in the vessel to about two volumes of water layer in the in the vessel, wherein the recirculating further comprises heating the water layer.

8. The method of claim 1 , wherein the water layer further comprises an iron oxide.

9. A method for removing hydrogen sulfide, comprising:

(A) introducing a methylmorpholine-N-oxide solution to a vessel, wherein the vessel comprises a water layer and a gas layer, wherein the water layer and the gas layer comprise the hydrogen sulfide;

(B) introducing methylmorpholine-N-oxide into the gas layer; wherein the methylmorpholine-N-oxide solution is introduced to the gas layer in an amount to provide a mole ratio of methylmorpholine-N-oxide to hydrogen sulfide in the vessel from about 1.0 mole methylmorpholine-N-oxide:1.0 mole hydrogen sulfide to about 3.0 moles methylmorpholine-N-oxide:1.0 mole hydrogen sulfide;

(C) introducing steam to the vessel, wherein steam removes at least a portion of the hydrogen sulfide from the water layer;

(D) allowing the steam comprising at least a portion of hydrogen sulfide from the water layer to evaporate into the gas layer;

(E) adjusting a hydrogen sulfide rate of evaporation by increasing the vessel temperature;

(F) treating the gas layer by allowing the methylmorpholine-N-oxide to react with the hydrogen sulfide; and

(G) treating the water layer by reducing the temperature of the gas layer to a temperature below the boiling point of methylmorpholine-N-oxide to condense the methylmorpholine-N-oxide into the water layer.

10. The method of claim 9 , further comprising allowing the hydrogen sulfide in the water layer to react with the methylmorpholine-N-oxide.

11. The method of claim 9 , wherein the treating the water layer comprises converting the hydrogen sulfide to elemental sulfur.

12. The method of claim 9 , wherein the elemental sulfur is removed from the vessel.

13. The method of claim 9 , further comprising introducing the steam to the vessel to increase a temperature of the gas layer to a temperature from about 234° F. to about 250° F.

14. The method of claim 9 , further comprising recirculating between about one volume of the water layer in the vessel to about two volumes of water layer in the in the vessel, wherein the recirculating further comprises heating the water layer.

15. The method of claim 9 , wherein the water layer further comprises an iron oxide.

16. A method for removing hydrogen sulfide, comprising:

(A) introducing a methylmorpholine-N-oxide solution to a vessel, wherein the vessel comprises a water layer and a gas layer, wherein the water layer and the gas layer comprise the hydrogen sulfide, wherein the water layer further comprises and iron oxide;

(B) introducing methylmorpholine-N-oxide into the gas layer;

(C) introducing steam to the vessel, wherein steam removes at least a portion of the hydrogen sulfide from the water layer;

(D) allowing the steam comprising at least a portion of hydrogen sulfide from the water layer to evaporate into the gas layer;

(E) adjusting a hydrogen sulfide rate of evaporation by increasing the vessel temperature;

(F) treating the gas layer by allowing the methylmorpholine-N-oxide to react with the hydrogen sulfide; and

(G) treating the water layer by reducing the temperature of the gas layer to a temperature below the boiling point of methylmorpholine-N-oxide to condense the methylmorpholine-N-oxide into the water layer.

17. The method of claim 16 , wherein the iron oxide acts as a catalyst in a reaction between the methylmorpholine-N-oxide and the hydrogen sulfide.

18. The method of claim 16 , wherein the water layer comprises from about 100 ppm iron oxide to about 1,000 ppm iron oxide.

19. The method of claim 16 , wherein the treating the water layer comprises converting the hydrogen sulfide to elemental sulfur.

20. The method of claim 16 , further comprising recirculating between about one volume of the water layer in the vessel to about two volumes of water layer in the in the vessel, wherein the recirculating further comprises heating the water layer.