METHOD FOR PRODUCING BIS-IMIDAZOLINES AND THEIR DERIVATIVES BASED ON PENTAETHYLENE HEXAMINES FOR CORROSION PROTECTION OF OILFIELD EQUIPMENT AND PIPELINES Russian patent published in 2021 - IPC C23F11/14 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the field of protection of gas and oilfield equipment and pipelines operating in hydrogen sulfide-containing highly mineralized aqueous media from corrosion and flooding, as well as oil and gas transportation. The method involves the interaction of polyethylene polyamines and carboxylic acids with the distillation of reaction water and impurities, while pentaethylene hexamine is used as a polyethylene polyamine, which interacts with monocarboxylic acid first at a temperature of 145-155°C for 4-6 hours, then at 255-260°C for 1.5-2.5 hours in a molar ratio of pentaethylene hexamine : monocarboxylic acid equal to 1:2-2.1, followed by the interaction of the resulting bis-imidazoline with N,N'-dimethyl-3.5-ditretbutyl-4-oxybenzylamine, Mannich base at a temperature of 116-120°C.

EFFECT: technical result is the expansion of the raw material base and the range of corrosion inhibitors.

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