Hydrogen sulfide scavenger
The present disclosure is related to a family of metals chelates for use as a hydrogen sulfide scavenger in asphalt, and the preparation thereof. The metal chelates, in particular amino acid metal chelates, are particularly efficient at reducing the hydrogen sulfide emissions of asphalt.
1. A scavenger composition comprising:
5 wt % to 90 wt %, based on total weight of the composition, of a metal chelate chosen from the group consisting of Copper Aspartate; Copper Gluconate; Copper Bis-Glycinate; Iron Aspartate; Iron Glycinate; Iron Fumarate; Iron Gluconate; Molybdenum Chelate; Molybdenum Trit; Zinc Arginate; Zinc Ascorbate; Zinc Aspartate; Zinc Gluconate; Zinc Bis-Glycinate; Zinc Methionate; Zinc Picolinate; and mixtures thereof; and
a solvent having a flash point compatible with asphalt or bitumen;
wherein the scavenger composition is able to reduce hydrogen sulfide emissions from asphalt.
2. The scavenger composition of claim 1 , wherein the metal chelate is selected from the group consisting of copper bis-glycinate and zinc bis-glycinate.
3. A method of reducing hydrogen sulfide emission from asphalt or from the preparation of asphalt, comprising adding the scavenger composition of claim 1 to asphalt.
4. The method of claim 3 , wherein the asphalt further comprises polyphosphoric acid.