Method for reducing hydrogen sulfide evolution from asphalt and heavy fuel oils
AssigneeBaker Hughes Incorporated
InventorsJoseph L. Stark, Jennifer D. Draper, Paul J. Biggerstaff, Donald L. Wolfe
Life of this patent
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Abstract
Hydrogen sulfide evolution from asphalt or heavy fuel oil may be reduced or eliminated using an additive to act as a scavenger. Zinc, in conjunction with an additional metal selected from Fe, Mn, Co, Ni, Cr, Zr, when present in the form of nano-particles of an oxide, borate or carboxylate is an effective component is preventing or mitigating the evolution of hydrogen sulfide. The nano-particles may be used neat or as a dispersion. These metals may also be complexed and used in the form of a solution. Molybdenum, when used with one or both of Fe and Zn is also a useful in any of these forms for the same purpose.
Claims17
A method comprising:
- admixing an additive with heavy fuel oil or an asphalt composition wherein the additive comprises nano-particles of a cobalt component selected from the group consisting of Co boroacylate, Co carboxylate, Co oxide, and combinations thereof;
- wherein the nano-particles are from about 5 to about 300 nm;
- and
- once admixed, reducing an amount of hydrogen sulfide emissions from the heavy fuel oil or the asphalt composition over a period of from about 1 hour to 4 days.
A method comprising:
- admixing an additive with heavy fuel oil or an asphalt composition wherein the additive comprises nano-particles of a cobalt component selected from the group consisting of Co boroacylate, Co carboxylate, Co oxide, and combinations thereof;
- wherein the nano-particles are from about 100 to about 300 nm, wherein the additive is present at a concentration sufficient to introduce from about 20 to 2500 ppm by weight Co oxide, Co carboxylate, or Co boroacylate into the heavy fuel oil or the asphalt;
- and
- once admixed, reducing an amount of hydrogen sulfide emissions from the heavy fuel oil or the asphalt composition over a period of from about 1 hour to 4 days.
A method comprising:
- admixing an additive with heavy fuel oil or an asphalt composition wherein the additive comprises nano-particles of a cobalt component selected from the group consisting of Co boroacylate, Co carboxylate, and combinations thereof;
- wherein the nano-particles are from about 5 to about 300 nm, wherein the additive is present at a concentration sufficient to introduce from about 20 to 2500 ppm by weight, Co carboxylate, Co boroacylate, or mixtures thereof into the heavy fuel oil or the asphalt;
- and
- once admixed, reducing an amount of hydrogen sulfide emissions from the heavy fuel oil or the asphalt composition over a period of from about 1 hour to 4 days.
Dependencies are inferred from the claim text.