LONG-CHAIN ALKYLPHOSPHONIC ACIDS AS SOFT STEEL CORROSION INHIBITORS AND THEIR PRODUCTION Russian patent published in 2008 - IPC C07F9/38 C23F11/167 

FIELD: chemistry.

SUBSTANCE: invention relates to phosphoroorganic chemistry, namely, to method of obtaining long-chain alkylphosphonic acids, possessing anticorrosion activity, based on α-olefins of industrial fraction C₁₆-C₁₈ and C₂₀-C_26. Invention can be applied for protection of pipelines, reservoirs, construction metallic structures, equipment for extraction, transportation and processing oil and gas, in metal processing. Long-chain alkylphosphonic acids are obtained by interaction of α-olefins of industrial fraction C₁₆-C₁₈ and C₂₀-C₂₆ with O,O-dimethylphosphorous acid in molar ratio 1:(1.0-2.0) in presence of benzoyl peroxide in amount of 1.0-5.0% of weight of dimethylphosphorous acid at 110-150°C during 10-12 hours in absence of solvent with further hydrolysis of intermediate higher O,O-dimethyl(alkyl) phosphonates with hydrochloric acid with heating, obtaining target product which represents mixture of long-chain alkylphosphonic acids.

EFFECT: elaboration of novel method of obtaining mixture of alkylphosphonic acids and soft steel corrosion inhibitor.

2 cl, 1 tbl, 3 ex