HYDROGEN SULPHIDE SCAVENGER (VERSIONS) Russian patent published in 2017 - IPC C10G29/20 

FIELD: chemistry.

SUBSTANCE: scavenger of hydrogen sulphide in oil and oil-water emulsions comprises a formaldehyde-containing reactant, a nitrogen-containing organic base, an inorganic base and a solvent, additionally comprises the reaction product of dimethylphosphite or phosphorous acid with 2-alkyl imidazoline (MF-1), wherein primary amines are taken as the nitrogen-containing organic base, preferably monoethanolamine, or diethanolamine, or triethanolamine, or urotropin, or ammonia, while aliphatic alcohols or mixtures thereof with water, or a mixture of aliphatic alcohol and an aromatic hydrocarbon are taken as a solvent in the following mixture ratio, wt %: a formaldehyde-containing reactant - 20.0-60,0, nitrogen-containing base - 3.0-30.0, inorganic base is - 0.1-1.0, the pX-1 - 1.0-10.0, solvent - the rest. In the second version scavenger comprises a formaldehyde-containing reactant, a nitrogen-containing organic base, an inorganic base and a solvent, additionally comprises the reaction product of phosphoric acid with an oxyalkylated alkylphenol (MF-2). Primary amines are taken as the nitrogen-containing organic base, preferably monoethanolamine, or diethanolamine, or triethanolamine, or urotropin, or ammonia, while aliphatic alcohols or mixtures thereof with water, or a mixture of aliphatic alcohol and an aromatic hydrocarbon are taken as a solvent in the following mixture ratio, wt %: a formaldehyde reagent - 20.0-60.0, nitrogen-containing base - 3.0-30.0, inorganic base - 0.1-1.0, MF-2 - 1.0-10.0, solvent - the rest.

EFFECT: creating of the hydrogen sulphide scavenger having a high neutralizing capacity, a required low chilling temperature, a better dispersion of the reagent in the treated oil, a reduction of local precipitates until their complete absence, an ability to inhibit the corrosion processes in oilfield areas and inhibit the growth of sulfate-reducing bacteria, as well as to expand the variety of known hydrogen sulfide scavengers.

12 cl, 5 tbl, 18 ex