METHOD FOR OBTAINING CORROSION INHIBITORS BASED ON TETRAPROPYLENE PENTAMINES FOR 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 oil field equipment and pipelines operating in highly mineralized hydrogen sulfide-containing aqueous media from corrosion, as well as the transportation of oil and gas. The method for obtaining corrosion inhibitors for oilfield, mineralized and hydrogen sulfide-containing media based on polypropylene polyamines and carboxylic acids with distillation of reaction water and impurities is characterized by the fact that, as polypropylene polyamine, tetrapropylenepentamine [(3,6,9,12-tetramethyl)-1,4,7,10,13-pentamino-tridecane], which reacts with monocarboxylic acid first at a temperature of 160°С for 4-5.5 h, then at a temperature of 255-260°С for 2-2.5 hours in a molar ratio of tetrapropylenepentamine : monocarboxylic acid equal to 1 : 2-2.1, followed by the interaction of the obtained bis-imidazoline with benzyl chloride at a temperature of 90°С in a molar ratio bis-imidazoline based on tetrapropylene pentaamine : benzyl chloride, equal to 1:1.05.

EFFECT: invention expands the raw material base and range of products.

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