METHOD FOR OBTAINING CORROSION INHIBITORS BASED ON BIS-IMIDAZOLINES FOR OILFIELD, MINERALIZED AND HYDROGEN SULFIDE-CONTAINING MEDIA 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. 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 benzyl chloride at a temperature of 90°C in a molar ratio of bis-imidazoline based on pentaethylene hexamine : benzyl chloride, equal to 1:1, or with the subsequent interaction of the resulting bis-imidazoline with benzyl chloride and acrylic acid nitrile at a temperature of 95°C in the molar ratio of bis-imidazoline based on pentaethylene hexamine : benzyl chloride : acrylic acid nitrile, equal to 1:1.05:1.

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

3 cl, 1 tbl, 2 ex