METHOD OF PREPARING INHIBITOR OF HYDROGEN SULFIDE CORROSION AND HYDROGENATION OF METALS Russian patent published in 2004 - IPC

FIELD: corrosion protein.

SUBSTANCE: method is accomplished as follows. Aliphatic monocarboxylic acids, in particular α,α¹-branched monocarboxylic acid fraction C₁₀-C₂₀, is brought into reaction with polyethylene-polyamines and 1,4-di(2-aminoethyl)piperazine at 250-280^оС for 2-6 h, molar ratio acids/ polyethylene-polyamines/piperazine derivative being 1(0.7-0.9):(0.2-0.5), after which reaction water and excess of polyethylene-polyamines are distilled for 2-4 h at 1-30 mm Hg, and reactor is cooled to 160-180^оС. Thereafter, α,α¹-branched monocarboxylic C₁₀-C₂₀-acids or tall oil acids are charged with stirring at 1:1 molar ratio of condensation product to acids, stirred for further 2-4 h, cooled to 40-60^оС, then 2-8% nonionic surfactant, 10-25% saturated monohydric C₁-C₄-alcohol, and 32-73% blended aromatic solvent are added with stirring, stirred to form homogenous solution, and cooled.

EFFECT: increased corrosion protection efficiency and reduced hydrogenation (plasticity loss) of metals.

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