Hydrogen sulfide scavengers for polymer treated asphalt
Scavenging compounds and compositions useful in reducing sulfide emissions from polymer treated asphalt, such as polyphosphoric acid, are disclosed. The scavengers include hexamethyl-enetetramine, water-free triazine, and water-free 1,3,5-triazine derivatives of formula I. Methods of using the compositions to reduce hydrogen sulfide emissions from asphalt are also disclosed.
1. A composition, comprising:
(a) asphalt or an asphalt mix further comprising polyphosphoric acid; and
a water-free triazine sulfide scavenging agent.
2. The composition of claim 1 , wherein the water-free triazine further comprises a low volatile polar solvent.
3. The composition of claim 2 , wherein the low volatile polar solve is selected from diethylene glycol, 2-butoxyethanol, propylene glycol, monoethanol amine, and mixtures of the same.
4. The composition of claim 1 , wherein the polyphosphoric acid is present in the asphalt or asphalt mix at about 1 wt. %.
5. A method of reducing hydrogen sulfide emission from asphalt, comprising:
combining polyphosphoric acid treated asphalt or asphalt mix with a sulfide scavenging agent, the sulfide scavenging agent selected from the group consisting of: water-free triazine, 1,3,5-triazine derivatives of formula I, and any combination thereof, wherein formula I comprises:
where each of R 1 , R 2 , and R 3 is independently selected from straight or branched C 1 -C 30 alkyl, hydroxyl substituted straight or branched C 1 -C 3 o alkyl, straight or branched C 1 -C 30 alkyl substituted with straight or branched C 1 -C 30 alkoxy.
6. The method of claim 5 , wherein the scavenger is of formula I, and each of R 1 , R 2 , and R 3 is independently selected from straight or branched C 6 -C 30 alkyl, hydroxyl substituted straight or branched C 6 -C 30 alkyl, straight or branched C 6 -C 30 alkoxy substituted with straight or branched C 1 -C 30 alkoxy.
7. The method of claim 5 , wherein the scavenger is of formula I, and each of R 1 , R 2 , and R 3 is the same.
8. The method of claim 5 , wherein the scavenger is of formula I, and at least one of R 1 , R 2 , and R 3 is different from the other R 1 , R 2 , and R 3 .
9. The method of claim 5 , wherein R 1 is —CH 2 CH 2 OH, R 2 is —CH 2 CH 2 OH, and R 3 is —CH 2 CH 2 OH.
10. The method of claim 5 , wherein the scavenger is water-free triazine.
11. The method of claim 5 , wherein the water-free triazine further comprises a low volatile polar solvent.
12. The composition of claim 1 , further comprising hexamethylenetetramine.
13. The method of claim 5 , further comprising combining the polyphosphoric acid treated asphalt or the asphalt mix with hexamethylenetetramine.
14. A composition, comprising:
(a) asphalt or an asphalt mix further comprising polyphosphoric acid; and
(b) a sulfide scavenging agent selected from the group consisting of: water-free triazine, a 1,3,5-triazine derivative of formula I, and any combination thereof, wherein formula I comprises:
wherein each of R 1 , R 2 , and R 3 is independently selected from straight or branched C 1 -C 30 alkyl, hydroxyl substituted straight or branched C 1 -C 30 alkyl, straight or branched C 1 -C 30 alkyl substituted with straight or branched C 1 -C 30 alkoxy.
15. The composition of claim 14 , wherein the scavenger is of formula I, and each of R 1 , R 2 , and R 3 is independently selected from straight or branched C 6 -C 30 alkyl, hydroxyl substituted straight or branched C 6 -C 30 alkyl, straight or branched C 6 -C 30 alkoxy substituted with straight or branched C 1 -C 30 alkoxy.
16. The composition of claim 14 , wherein the scavenger is of formula I, and each of R 1 , R 2 , and R 3 is selected from C 1 -C 9 straight or branched alkyl.
17. The composition of claim 14 , wherein the scavenger is of formula I, and each of R 1 , R 2 , and R 3 is the same.
18. The composition of claim 14 , wherein the scavenger is of formula I, and at least one of R 1 , R 2 , and R 3 is different from the other R 1 , R 2 , and R 3 .
19. The composition of claim 14 , wherein R 1 is —CH 2 CH 2 OH, R 2 is —CH 2 CH 2 OH, and R 3 is —CH 2 CH 2 OH.
20. The composition of claim 14 , wherein the polyphosphoric acid is present in the asphalt or asphalt mix at about 1 wt. %.