Claims
- 1. A method for reducing the levels of sulfides present in gaseous discharge from a waste water treatment system, comprising contacting fluids in said waste water system with a triazine composition comprising a reaction product of (i) a compound of formula NH.sub.2 --CHR'--R", where R' is H, an alkyl group of 1 to 6 carbons, a hydroxyalkyl of an alkyl group of 1 to 6 carbons or an N,N-dialkylalkylene amine of an alkyl group of 1 to 6 carbons and R" is H or an alkyl group of 1 to 6 carbons and (ii) formaldehyde or paraformaldehyde, said reaction product consisting essentially of a hexahydrotriazine, said triazine contacting step substantially reducing the level of sulfides in said gaseous discharge, said sulfide reduction being due predominantly to the conversion of said sulfides to dithiazines.
- 2. A method according to claim 1, wherein the fluid contacted is the gaseous discharge from the waste water system.
- 3. A method according to claim 1, wherein the fluid contacted is the waste water.
- 4. A method as in claim 1, wherein said hexahydrotriazine is represented by ##STR3## wherein R' is H, an alkyl group of 1 to 6 carbons, a hydroxyalkyl of an alkyl group of 1 to 6 carbons or an N-N-dialkylalkylene amine of an alkyl group of 1 to 6 carbons and R" is H or an alkyl group of 1 to 6 carbons.
- 5. A method as in claim 4, wherein R' is H, CH.sub.3 --, CH.sub.3 CH.sub.2 --, CH.sub.3 CH.sub.2 CH.sub.2 --, (CH.sub.3).sub.2 CH--, HOCH.sub.2 CH.sub.2 --, HOCH.sub.2 --, HO(CH.sub.3)CH--, (CH.sub.3).sub.2 NCH.sub.2 -- or (C.sub.2 H.sub.5).sub.2 NCH.sub.2 --; and R" is H, CH.sub.3 -- or CH.sub.3 CH.sub.2 --.
- 6. A method as in claim 1, wherein said composition further contains water and a mono- or dihydric alcohol of 1 to 6 carbons.
- 7. A method as in claim 6, wherein said alcohol is selected from the group consisting of CH.sub.3 OH, CH.sub.3 CH.sub.2 OH, (CH.sub.3).sub.2 CHOH and HOCH.sub.2 CH.sub.2 OH.
- 8. A method as in claim 4, wherein R' is HOCH.sub.2 --, HOCH.sub.2 CH.sub.2 --or HO(CH.sub.3)CH-- and R" is H or CH.sub.3 --.
- 9. A method as in claim 1, wherein said hexahydrotriazine is N,N',N"-tris(2-hydroxyethyl)hexahydro-s-triazine.
- 10. A method as in claim 6, wherein said composition comprises 20 to 80 weight percent of a compound of Formula I, 20 to 80 weight percent of water and 0 to 60 weight percent of a mono- or dihydric alcohol of 1 to 6 carbons.
- 11. A method as in claim 6, wherein said composition comprises 25 to 40 weight percent of a compound of Formula I, 48 to 60 weight percent of water and 12 to 20 weight percent of a mono- or dihydric alcohol of 1 to 6 carbons.
- 12. A method as in claim 1, wherein said sulfides are selected from the group consisting of hydrogen sulfide, organic sulfides, carbonyl sulfides, and carbon disulfide.
- 13. A method as in claim 1, wherein said hexahydrotriazine is a trisubstituted hexahydro-s-triazine.
- 14. A method as in claim 1, wherein the sulfide-containing stream includes carbon dioxide.
- 15. A method comprising the step of contacting a gas stream comprising a sulfide selected from the group consisting of hydrogen sulfide and methyl mercaptan, with a triazine composition comprising a reaction product of (i) a compound of formula NH.sub.2 --CHR'--R", where R' is H, an alkyl group of 1 to 6 carbons, a hydroxyalkyl of an alkyl group of 1 to 6 carbons or an N,N-dialkylalkylene amine of an alkyl group of 1 to 6 carbons and R" is H or an alkyl of 1 to 6 carbons and (ii) formaldehyde or paraformaldehyde, said reaction product consisting essentially of a hexahydrotriazine, said method comprising reduction of sulfide in the gas due predominantly to the conversion of sulfide to dithiazines.
- 16. A method as in claim 15, wherein said hexahydrotriazine is represented by ##STR4## wherein R' is H, an alkyl group of 1 to 6 carbons, a hydroxyalkyl of an alkyl group of 1 to 6 carbons or an N-N-dialkylalkylene amine of an alkyl group of 1 to 6 carbons; and R" is H or an alkyl group of 1 to 6 carbons.
- 17. A method as in claim 16, wherein R' is H, CH.sub.3 --, CH.sub.3 CH.sub.2 --, CH.sub.3 CH.sub.2 CH.sub.2 --, (CH.sub.3).sub.2 CH--, HOCH.sub.2 CH.sub.2 --, HOCH.sub.2 --, HO(CH.sub.3)CH--, (CH.sub.3).sub.2 NCH.sub.2 -- or (C.sub.2 H.sub.5).sub.2 NCH.sub.2 --; and R" is H, CH.sub.3 -- or CH.sub.3 CH.sub.2 --.
- 18. A method as in claim 16, wherein R' is HOCH.sub.2 --, HOCH.sub.2 CH.sub.2 -- or HO(CH.sub.3)CH-- and R" is H or CH.sub.3.
- 19. A method as in claim 15, wherein said composition further contains water and a mono- or dihydric alcohol of 1 to about 6 carbons.
- 20. A method as in claim 19, wherein said composition comprises 20 to 80 weight percent of a compound of Formula I, 20 to 80 weight percent of water and 0 to 60 weight percent of a mono- or dihydric alcohol of 1 to 6 carbons.
- 21. A method as in claim 19, wherein said composition comprises 25 to 40 weight percent of a compound of Formula I, 48 to 60 weight percent of water and 12 to 20 weight percent of a mono- or dihydric alcohol of 1 to 6 carbons.
- 22. A method as in claim 18, wherein said alcohol is selected from the group consisting of CH.sub.2 OH, CH.sub.3 CH.sub.2 OH, (CH.sub.3).sub.2 CHOH and HOCH.sub.2 CH.sub.2 OH.
- 23. A method as in claim 15, wherein said hexahydrotriazine is N,N',N"-tris(2-hydroxyethyl)hexahydro-s-triazine.
- 24. A method as in claim 15, wherein said hexahydrotriazine is a trisubstituted hexahydro-s-triazine.
- 25. A method as in claim 15, wherein the gas stream includes carbon dioxide.
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is a continuation of U.S. patent application Ser. No. 08/200,857, filed Feb. 22, 1994, which is in turn a continuation of Ser. No. 07/837,544, filed Feb. 14, 1992, which in turn is a continuation of Ser. No. 07/557,255, filed Jul. 24, 1990, all now abandoned, the latter being a continuation-in-part of our U.S. patent application Ser. No. 452,539, filed Dec. 18, 1989, now U.S. Pat. No. 4,978,512, which is a continuation-in-part of our U.S. patent application Ser. No. 289,352, filed Dec. 23, 1988, now abandoned, for "Composition and Method of Sweetening Natural Gas".
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Foreign Referenced Citations (2)
Number |
Date |
Country |
2-180698 |
Jul 1990 |
JPX |
9007467 |
Jul 1990 |
WOX |
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Continuations (3)
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200857 |
Feb 1994 |
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837554 |
Feb 1992 |
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Parent |
557255 |
Jul 1990 |
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Continuation in Parts (2)
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452539 |
Dec 1989 |
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289352 |
Dec 1988 |
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