Process and composition for the removal of hydrogen sulfide from industrial process fluids
View Patent ↗The invention relates to a method for the prevention and removal of H 2 S and/or other sulfhydryl compounds and iron sulfide deposits from gas and/or liquid streams in industrial process systems. Formulations comprising aldehydes, aldehyde donors, and/or aldehyde stabilizers, excluding triazines, in combination with the reaction product of an amino acid and a hydroxymethylphosphine or hydroxymethylphos-phonium salt, and optionally a quaternary ammonium compound and/or one or more N-hydrogen compounds such as 5,5-dialkylhydantoin or amines, are rapidly and sustainedly scavenging H 2 S originating from process and/or microbial sources. The formulations possess high capacities for H 2 S removal and are relatively pH-insensitive.
1. A method for preventing the generation of, and/or removing hydrogen sulfide and/or sulfhydryl compounds and their corrosion products, including iron sulfide, in an industrial process fluid or system, which comprises adding to the industrial process fluid or system an effective amount of a composition comprising:
(i) at least one aldehyde or aldehyde donor that is not a triazine
(ii) the reaction product of a hydroxymethylphosphine or hydroxymethylphosphonium compound and an amino acid and, optionally,
(iii) a quaternary ammonium or N-hydrogen compound or mixture thereof,
wherein the hydroxymethylphosphine or hydroxymethylphosphonium compound and the amino acid are in a molar ratio of 1:1 to 1:12, and
wherein the molar ratio of the aldehyde or aldehyde donor to the reaction product of the hydroxymethylphosphine or hydroxymethylphosphonium compound and the amino acid is from 0.02:1 to 100:1.
2. The method of claim 1 , wherein the composition includes the quaternary ammonium compound and has the formula (R 1 R 2 R 3 R 4 N + ) n X n− wherein R 1 , R 2 , R 3 , and R 4 are each independently an alkyl group having from 1 to 30 carbon atoms or an arylalkyl group having from 7 to 30 carbon atoms, and X n− is a mono- or polyvalent anion selected from the group consisting of a halide, a C 2-20 mono- or dicarboxylate, a borate, nitrate, bicarbonate, carbonate, sulfamate, a sulfonate, sulfate, and a phosphate.
3. The method of claim 1 , wherein the molar ratio of the aldehyde or aldehyde donor to quaternary ammonium or N-hydrogen compound or mixture thereof is from 0.1:1 to 100:1.
4. The method of claim 1 , wherein the composition includes the N-hydrogen compound and is selected from the group consisting of p-toluenesulfonamide, 5,5-dialkylhydantoins, methanesulfonamide, barbituric acid, 5-methyluracil, imidazoline, pyrrolidone, morpholine, ethanolamine, acetanilide, acetamide, N-ethylacetamide, phthalimide, benzamide, succinimide, N-methylurea, N-acetylurea, methyl allophanate, methyl carbamate, phthalohydrazide, pyrrole, indole, formamide, N-methylformamide, dicyanodiamide, ethyl carbamate, 1,3-dimethylbiuret, methylphenylbiuret, 4,4-dimethyl-2-oxazolidinone, 6-methyluracil, 2-imidazolidinone, ethyleneurea, 2-pyrimidone, azetidin-2-one, 2-pyrrolidone, caprolactam, phenylsulfinimide, phenylsulfinimidylamide, diarylsulfinimides, dialkylsulfinimides, isothiazoline-1,1-dioxide, hydantoin, glycinamide, creatine, glycoluril, C 1-20 alkylamines, (C 1-20 alkyl)alkylenediamines, and (C 1-20 alkyl)alkylenetriamines.
5. The method of claim 1 , wherein the at least one aldehyde or aldehyde donor is selected from the group consisting of hydroxymethylhydantoins, bis(hydroxymethyl)hydantoins, imidazolidinyl urea, glyoxal, formaldehyde, glutaraldehyde, N-methylolurea, and acrolein.
6. The method of claim 1 , wherein the hydroxymethylphosphine or hydroxymethylphosphonium compound is selected from the group consisting of tris-(hydroxymethyl)phosphine, tetrakis(hydroxymethyl)phosphonium chloride; bis-[tetrakis(hydroxymethyl)phosphonium]sulfate, 1,2-bis[bis(hydroxymethyl)-phosphino]benzene, 1,ω-bis[bis(hydroxymethyl)phosphino]alkylenes wherein the alkylene is a C 1-6 methylene chain, tris(hydroxymethyl)(C 1-20 alkyl)phosphonium halides, and tris(hydroxymethyl)(aryl-C 1-20 alkyl)phosphonium halides.
7. The method of claim 1 , wherein the amino acid is selected from the group consisting of glycine, lysine, alanine, histidine, aspartic acid, glutamic acid, serine, threonine, asparagine, glutamine, cysteine, proline, valine, isoleucine, leucine, methionine, phenylalanine, tyrosine, tryptophan, 12-aminolauric acid, and mixtures thereof.
8. The method of claim 1 , wherein the industrial process system is selected from the group consisting of an oil and gas production system, a produced water storage tank, an oil storage tank, an oil or gas transmission pipeline, ballast water tank, or oil transportation tank.
9. The method of claim 1 , wherein the industrial process system is a cooling tower.
10. The method of claim 1 , wherein the industrial process system is a fuel storage tank.
11. The method of claim 1 , wherein the industrial process system is an oil storage tank or transport system.
12. The method of claim 1 , wherein the industrial process fluid is a fracturing fluid or a drilling mud.
13. The method of claim 1 , wherein the aldehyde or aldehyde donor, the reaction product of the hydroxymethylphosphine or hydroxymethylphosphonium compound and amino acid, and, optionally, the quaternary ammonium compound or N-hydrogen compound, are combined prior to addition to the system.
14. The method of claim 1 , wherein the aldehyde or aldehyde donor and the reaction product of the hydroxymethylphosphine or hydroxymethylphosphonium compound and amino acid are combined prior to addition to the system and the quaternary ammonium compound or N-hydrogen compound is added separately to the system.
15. The method of claim 1 , wherein the aldehyde or aldehyde donor and the quaternary ammonium compound or N-hydrogen compound are combined separately from the reaction product of the hydroxymethylphosphine or hydroxymethylphosphonium compound and amino acid and each combined product is added separately to the system.
16. The method of claim 1 , wherein the molar ratio of the aldehyde or aldehyde donor to the reaction product of a hydroxymethylphosphine or hydroxymethylphos-phonium compound and an amino acid is from 0.1:1 to 20:1.
17. The method of claim 1 , wherein the molar ratio of the aldehyde or aldehyde donor to the reaction product of a hydroxymethylphosphine or hydroxymethylphos-phonium compound and an amino acid is from 0.5:1 to 4:1.
18. The method of claim 3 , wherein the molar ratio of the aldehyde or aldehyde donor to quaternary ammonium or N-hydrogen compound or mixture thereof is from 0.2:1 to 20:1.
19. The method of claim 3 , wherein the molar ratio of the aldehyde or aldehyde donor to quaternary ammonium or N-hydrogen compound or mixture thereof is from 0.5:1 to 6:1.