METHOD FOR OBTAINING CORROSION INHIBITORS BASED ON BIS-IMIDAZOLINES AND THEIR DERIVATIVES 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 operating in highly mineralized hydrogen sulfide-containing aqueous media from corrosion, as well as during the transportation of oil and gas. The method involves the interaction of polypropylene polyamine and carboxylic acid with the distillation of reaction water and impurities, while tetrapropylene pentamine [(3,6,9,12-tetramethyl)-1,4,7,10,13-pentamine-tridecane] is used as polypropylene polyamine, which interacts with monocarboxylic acid, which is used as oleic acid, first at a temperature of 160°C for 5.5 hours, then at a temperature of 260°C for 2.5 hours in the molar ratio of tetrapropylene pentamine and oleic acid, equal to 1:2.1, with the subsequent interaction of the obtained bis-imidazoline with propylene oxide at a temperature of 45°C in the molar ratio of bis-imidazoline based on tetrapropylene pentamine and propylene oxide equal to 1:1.05.

EFFECT: expansion of the raw material base and the range of products.

1 cl, 1 tbl, 1 ex