METHOD OF PRODUCING CORROSION INHIBITOR FOR FERROUS METALS FOR PROTECTION OF OIL FIELD EQUIPMENT Russian patent published in 2016 - IPC C23F11/14 

FIELD: metal processing.

SUBSTANCE: invention relates to metals protection against corrosion and can be used in oil industry for protection of process equipment and pipelines against corrosion destructions in water-oil media. Method involves diethylenetriamine reacting with tallol fatty acids, condensation of obtained product with paraformaldehyde and isononylpfenol, then condensation product is treated with maleic anhydride in amount of 0.1-1 mole per 1 mole of used diethylenetriamine, and obtained product is treated with zinc oxide in amount of 0.05-0.5 mole per 1 mole of maleic anhydride to obtain product of general formula

,

where R is alkyl or alkylene radical with number of atoms C₈-C₂₀.

EFFECT: technical result is production of inhibitor with high degree of protection of ferrous metals against corrosion (not less than 90 %) at minimum inhibitor dosages to 10 ppm.

1 cl, 1 ex