Composition and method for chelated scavenging compounds
There is disclosed herein a composition and method for removing a sulphur compound or carbon dioxide from a substance and methods for its use, said composition comprising a metal at between about 0.5 to 25 percent by weight, a base at between about 1 to 99 percent by volume, a chelating agent at between about 0.1 to 50 percent by weight and water.
1. A composition for removing a sulphur compound and/or carbon dioxide from a fluid, said composition comprising:
(a) a metal, at between about 0.05 to 25 percent by weight of the composition;
(b) a base, at between about 1 to 99 percent by volume of the composition;
(c) a chelating agent between about 0.1 to 50% by weight of the composition;
(d) water; and
(e) an antifreeze agent at no more than 50% by volume of the composition.
2. The composition of claim 1 wherein the sulphur compound is selected from a group consisting of: hydrogen sulphide, methyl mercaptan and ethyl mercaptan.
3. The composition of claim 1 wherein the metal is selected from a group consisting of: copper, zinc, iron, magnesium and manganese.
4. The composition of claim 1 wherein the metal is copper.
5. The composition of claim 1 wherein the metal is zinc.
6. The composition of claim 1 wherein the metal is present at between about 1 to 15 percent by weight of the composition.
7. The composition of claim 1 wherein the base is ammonium hydroxide.
8. The composition of claim 1 wherein the base is monoethanolamine.
9. The composition of claim 1 wherein the base is present between about 5 to 80 percent by volume of the composition.
10. The composition of claim 1 wherein the chelating agent is citric acid.
11. The composition of claim 1 wherein the chelating agent is a salt of citric acid.
12. The composition of claim 11 wherein the salt of citric acid is zinc citrate.
13. The composition of claim 1 wherein the chelating agent is tartaric acid.
14. The composition of claim 1 wherein the chelating agent is a salt of tartaric acid.
15. The composition of claim 14 wherein the salt of tartaric acid is zinc tartrate.
16. The composition of claim 1 further comprising an ammonium salt at about between 0 to 50% by weight of the composition.
17. The composition of claim 16 wherein the ammonium salt is selected from a group consisting of ammonium carbonate, ammonium sulphate or ammonium citrate.
18. The composition of claim 1 wherein the antifreeze agent is ethylene glycol.
19. The composition of claim 18 wherein ethylene glycol is present at about 5 to 50% percent by volume of the composition.
20. The composition of claim 1 wherein the antifreeze agent is methanol.
21. The composition of claim 20 wherein methanol is present at about 5 to 50% percent by volume of the composition.