METHOD OF OBTAINMENT OF BASES FOR CORROSION INHIBITORS OF PROLONGED ACTION FOR PROCESS EQUIPMENT PROTECTION (VERSIONS) Russian patent published in 2017 - IPC C23F11/14 

FIELD: metallurgy.

SUBSTANCE: invention refers to corrosion protection for metals, namely methods of obtaining polymer bases for compositions ensuring reliable protection in media containing dissolved hydrogen sulphide or carbon dioxide showing high sorption activity towards metal surfaces, and can be applied in oil production and processing industries for process equipment protection. Method involves condensation of alkoxylated tall fatty amine obtained by reaction of tall fatty amine with ethylene or propylene oxide, with anhydride of a dibasic acid from the range including: malonic acid, succinic acid, glutaric acid, maleic acid, sebacic acid, ortho-phthalic acid, at the following component ratio, wt %: tall fatty amine 40-65; ethylene or propylene oxide 15-33; the rest is anhydride of dibasic organic acid; obtained preproduct of equimolar opening of dibasic organic acid anhydride is added to excessive alkoxylated tall fatty amine at the molar ratio of alkoxylated tall fatty amine to the said product equal to 3: 2, obtaining a base for corrosion inhibitor in the form of an oligomerous product. In the second variant, the method is implemented in the presence of a base catalyst.

EFFECT: obtainment of corrosion inhibitors of prolonged action by a convenient method out of non-toxic raw materials.

2 cl, 1 tbl, 15 ex