Development of a novel high temperature stable scavenger for removal of hydrogen sulfide
The present disclosure provides compositions and methods that are useful in removing, lowering the amount of, or otherwise controlling hydrogen sulfide and mercaptans. The compositions and methods can be used in any industry where hydrogen sulfide poses problems, such as when dealing with crude oil based, natural gas based, and/or coal based products. The present disclosure provides compositions and methods that can reduce the amount of or eliminate hydrogen sulfide in a variety of mediums.
1. A method of treating hydrogen sulfide in a stream comprising:
adding a composition to a stream comprising an amount of hydrogen sulfide, wherein the composition comprises one or more scavenger compounds having the following general formula:
wherein the C 1 -C 6 ring structure may be aromatic or cyclic aliphatic;
C 1 -C 6 may be independently selected from carbon, nitrogen, oxygen, and sulfur, wherein C 2 may be present or absent and, if absent, the ring structure is a five-membered ring structure;
wherein C 2 -C 4 may be independently selected from the group: X-R-{(OCH 2 ) k OH} m ;
wherein the ring structure may be substituted with an electron withdrawing group or an electron donating group;
X may be selected from the group consisting of carbon, nitrogen, oxygen, sulfur, a carbonyl group, an alkyl group, and an alkenyl group;
R may be selected from the group consisting of hydrogen, an alkyl group, an alkenyl group, an alkynyl group, nitrogen and oxygen, wherein the alkyl group, alkenyl group and the alkynyl group may be unsubstituted or substituted;
k is an integer selected from 0 to 25; and
m is an integer selected from 1 to 4.
2. The method of claim 1 , wherein the ring structure is aromatic, X is N(NH), R is a C 1 -C 8 alkyl group, and k+m=18.
3. The method of claim 1 , wherein the ring structure is aromatic, X is NCH 2 OH, R is a C 1 -C 8 alkyl group, and k+m=7.
4. The method of claim 1 , wherein the stream is a liquid stream or a gaseous stream.
5. The method of claim 1 , wherein the stream comprises one or more hydrocarbons.
6. The method of claim 1 , wherein the composition excludes triazine compounds.
7. The method of claim 1 , wherein the composition comprises a solvent selected from the group consisting of isopropanol, methanol, toluene, water, xylene, ethylene glycols, propylene glycols, and any combination thereof.
8. The method of claim 7 , wherein the solvent comprises from about 10% to about 99%, by weight, of the one or more scavenger compounds.
9. The method of claim 7 , wherein the solvent comprises from about 30% to about 70%, by weight, of the one or more scavenger compounds.
10. The method of claim 1 , wherein the one or more scavengers are thermally stable at a temperature of about 200° C.
11. The method of claim 1 , wherein the composition comprises one or more additives selected from the group consisting of asphaltene inhibitors, paraffin inhibitors, corrosion inhibitors, scale inhibitors, emulsifiers, water clarifiers, dispersants, emulsion breakers, additional hydrogen sulfide scavengers, gas hydrate inhibitors, biocides, pH modifiers, surfactants, solvents, and any combination thereof.
12. The method of claim 1 , wherein the stream is used in the production, transportation, storage, and/or separation of crude oil or natural gas.
13. The method of claim 1 , wherein the stream is used or produced in a coal-fired process, a waste-water process, a farm, a slaughter house, a land-fill, a mining operation, a pulp and paper facility, or a biofuel process.
14. The method of claim 1 , wherein the method lowers the amount of hydrogen sulfide in the stream by about 85% to about 100%.
15. The method of claim 1 , wherein a ratio of an amount of the one or more scavenger compounds added to the stream to the amount of hydrogen sulfide is from about 1:1 to about 30:1.
16. The method of claim 1 , wherein the one or more scavenger compounds are non-corrosive.