Long-chain alkylphosphonic acids as soft steel corrosion inhibitors and their production |
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IPC classes for russian patent Long-chain alkylphosphonic acids as soft steel corrosion inhibitors and their production (RU 2337914):
  
 Corrosion inhibitor for hydrogen sulfide and carbon dioxide containing media / 2337181
Inhibitor contains, wt %: fatty acid - 8-20, oxyethylated alkyl- or phenol- N-methylalkylammonium methylphosphites - 7-21, nonionic surfactant - 7-16, solvent - the rest.
 Composition for corrosion and salt deposition prevention / 2334689
Composition contains quaternary phosphonic salt - THP+ -salt and primary, secondary or tertiary alcohol having acetylene bond in basic carbon chain. Composition is proposed to be applied to corrosion processing soft low-carbon steel, copper or aluminium. Treatment method of water system containing or being in contact to metal sulphide deposition, simultaneously preventing corrosion of surfaces in contact to the specified water system, implies the specified water system is added with the composition cited above.
 Method for preventing scale and corrosion in water supply and heating systems / 2328453
Invention relates to the methods for preventing the mineral scale and corrosion and can be used in water preparation of the heating, cooling systems and in the circulating water systems. The method is performed by adding the composition which contains the hexamethylene diamine tetramethylenephosphonic acid and its zinc containing complexonate at their mol ratio 4:1-2:1.
 Corrosion inhibitors for water systems / 2324767
Invention refers to the method of corrosion inhibiting in water systems. To the industrial water system it is added the mixture on the base of phosphine- succinic acid which consist the following elements: mono-, bis-, and oligomerous adducts of the phosphine- succinic acid. In the ratio of the phosphine- succinic acid are: 36-49 mole percent bis-adducts of the phosphine- succinic acid and 27, 28, 29, 31, 34.6 or 35 mole percent of the oligomerous adducts of the phosphine- succinic acid.
 Oxyethylated alkyl- (or phenol)methyl- or ethyl phosphites of n-methyl- or ethylalkylammonium as corrosion inhibitors possessing bactericidal activity with respect to sulfate-reducing microorganisms / 2298555
Invention relates to nitrogen- and phosphorus-containing compounds. Invention describes oxyethylated alkyl- (or phenol)methyl- or ethyl phosphites of N-methyl- or ethylalkylammonium of the general formula:
 Composition for protein against corrosion and fouling / 2293799
Composition suitable for use in recycling water supply systems, on heat stations and petrochemical plants. Composition contains 3-12 mg/L of polyhexamethyleneguanidine phosphate, 3-12 mg/L of 1-hydroxyethylenediphodphonic acid, and water - the balance.
Corrosion and salt formation inhibitor (versions) / 2256727
Proposed inhibitor contains the following components, mass-%: phosphate inhibitor, 5-40; phosphonate inhibitor, 5-40; anhydrous hygroscopic salt of alkaline or alkaline-earth metals of inorganic acids whose molecule may add-on 4-12 molecules of water, for example, sulfates and carbonates of sodium, potassium, calcium, the remainder being sodium and potassium orthophosphates. Inhibitor contains, mass-%: water-soluble polymer (molecular mass 3000-20000), 5-40; anhydrous hygroscopic salt of alkaline or alkaline-earth metals of inorganic acids whose molecule may add-on 4-12 molecules of water, for example sulfates and carbonates of sodium, potassium and calcium; the remainder being sodium and potassium orthophosphates.
 Corrosion inhibitor in mineralized hydrogen sulfide-containing oil- field media / 2255142
Invention relates to means protecting oil-field equipment against hydrogen sulfide corrosion, in particular to product obtained by reaction of phosphorus-containing acid, nonionic surfactant, and ethanolamine at their molar ratio 1(0.8-1.2):(0.8-1.2), respectively. Phosphorus-containing acid is obtained by reaction of phosphorous acid with polyatomic alcohol at their molar ratio 1:(0.5-1.5).
 Bactericidal corrosion inhibitor in mineralized hydrogen sulfide-containing oil-field media / 2255141
Invention relates to means protecting oil-field equipment against hydrogen sulfide corrosion, in particular to reagents suppressing growth of sulfate-reducing bacteria. Proposed bactericide is product obtained by reaction of primary aliphatic C8-C18-amines with phosphorus-containing acid derivative, the latter, in particular, being by reaction of phosphorous acid and polyatomic alcohol at their molar ratio 1:(0.8-1.2), respectively.
 Corrosion inhibitor in hydrogen sulfide-containing media / 2248411
Invention provides inhibitor for protecting oil-field equipment against hydrogen sulfide, carbon dioxide, and oxygen corrosion, which comprises, in solvent, 1-10% of reaction product of monoethylated alkylphenol with phosphorus-containing compound and amine, 1-20% of nonionic surfactant, 5-40% of organic acid/amine reaction product, and 2-15% of interaction product of a mixture of primary and secondary aliphatic amines with low-grade dimethyl phosphite.
 Amorphous alendronate monosodium, methods of production, based pharmaceutical composition and method of inhibition of bone resobrtion / 2334751
Invention refers to method of production of amorphous alendronate monosodium and to solid pharmaceutical composition having property to invoke bone bulk expansion and containing therapeutically effective amount of amorphous alendronate monosodium, produced by stated method. Method of production of amorphous alendronate monosodium includes solvent removal from alendronate monosodium solution using spray drying.
 Acidic phosphorous containing complex forming reagent and method of obtaining it (versions) / 2331651
The invention pertains to an acidic phosphorous containing reagent, is used in the oil industry, heat energy, textile industry, production of mineral fertilizers and household chemistry, and to methods of obtaining the reagent. The reagent (conventional name "АФК-1") contains the following in given mass %: acetoxyethylidenediphosphonic acid 50.0-95.0 mass %, acetic acid - 29.5-0.5 mass %, the rest is acetic anhydride to 100. The quantitative composition of the indicated reagent is determined by the method of obtaining it and the ratios of the initial reagents. The method of obtaining the reagent involves adding acetic anhydride to a suspension of acetic and phosphorous acid at temperature of 60-90°C for a period of 1.5 hours. The reaction mixture is kept at 100-110°C for 1 hour and acidic impurities are distilled off to a controlled volume of distillate. Similar methods are developed based on phosphorous containing wastes from production of acid chlorides of higher fatty acids. The wastes are treated with water or a water solution of acetic acid with subsequent separation of the organic layer of fatty acids, after which the residue, containing phosphorous acid, is treated with phosphorous tri-chloride and acetic anhydride at 115-130°C, and acidic impurities are distilled off to the controlled distillate volume.
 Acidic phosphorous containing complex-forming reagent and method of obtaining it / 2331650
Invention pertains to the chemistry of phosphorous organic compounds, and specifically to an acidic phosphorous containing complex-forming reagent, which can be used in the oil industry, heat energy, textile industry, production of mineral fertilizers and household chemistry, and to the method of obtaining it. The acidic phosphorous containing complex-forming reagent (conventional name "АФК-2") contains the following in mass %: acetoxyethylidenediphosphonic acid - 50-95 mass %, acetic acid - 50-5 mass %. The method of obtaining the composition involves adding phosphorous tri-chloride, acetic acid and water simultaneously to glacial acetic acid in molar ratios equal to 1:(4.5-5.5):(1.93-1.95), at temperature of 35-45°C with subsequent keeping of the reaction mixture at 110-120°C for a period of 2 hours and controlled distillation of acidic impurities to the required distillate volume.
Method of obtaining inhibitor of precipitation of mineral salts / 2329270
Invention pertains to the method of obtaining an inhibitor of precipitation of mineral salts, The inhibitor is obtained by reaction of hexamethylenediamine and ammonium chloride with formaldehyde and phosphorous acid in a medium of diluted hydrochloric acid at high temperature with subsequent neutralisation of the obtained solution using sodium hydroxide to pH of 6.5±1.0. The process is carried out with molar ratio of hexamethylenediamine to ammonium chloride of 1:3-6.
 Plasma carboxypeptidase b inhibitors / 2323223
Invention describes compound of the formula (I):
 Method for preparing monohydroperfluoroalkanes, bis-(perfluoroalkyl)phosphinates and perfluoroalkylphosphonates / 2319705
Invention describes a method for synthesis of monohydroperfluoroalkanes, bis-(perfluoroalkyl)phosphinates and perfluoroalkylphosphonates. Method involves treatment of at least one perfluoroalkylphosphorane with at least one base wherein base(s) are chosen from group consisting of alkali-earth metal hydroxides, metalloorganic compound in useful solvent or at least one organic base and an acid in useful reaction medium. Also, invention describes novel perfluoroalkylphosphonates and bis-(perfluoroalkyl)phosphinates, using novel perfluoroalkylphosphonates and bis-(perfluoroalyl)phosphinates as ionic liquids, catalysts of phase transfer or surfactants.
 Method for preparing copper (ii), zinc (ii), nickel (ii) and cobalt (ii) nitrilotri-(methylenephosphonates)(2-) / 2314313
Invention relates to a method for preparing copper (II), zinc (II), nickel (II) and cobalt (II) nitrilotri-(methylenephosphonates)(2-) that involves crystallization from aqueous solutions prepared by interaction of metal (II) compound with nitrilotri-(methylenephosphonic) acid or its salt with sodium potassium or ammonium in aqueous medium at temperature from -5°C to 105°C under atmosphere pressure. As a reactive of the metal (II) compound source the waste from manufacturing printing plates and galvanic covers can be used. The end products can be used in preparing the complex electrolytes and solutions for applying metallic covers by electrochemical and chemical methods in aims for inhibition against the equipment corrosion, and for preparing other compounds of metals with nitrilotri-(methylenephosphonic) acid.
 Phosphonic acid compounds as serine proteinase inhibitors / 2311421
Invention relates to phosphonic acid compounds used as inhibitors of serine proteinase of the general formula (I):
 Method for preparing n-phosphonomethylglycine / 2311420
Invention relates to a novel method for synthesis of N-phosphonomethylglycine. Method involves interaction of hexahydrotriazine compound with triacyl phosphite in organic solvent, saponification of formed phosphonic compound after preliminary extraction into aqueous phase, separation of organic phase and precipitation of N-phosphonomethylglycine by pH value control in the range from 0.5 to 2.0. Invention prevents decomposition of an organic solvent in saponification.
Method of production of the water solution of disodium or dipotassium salt of zinc oxyethylidene phosphonate with concentration of fifteen - twenty three percent / 2305102
The invention is pertaining to the method of production of the water solutions of disodium or dipotassium salt of zinc oxyethyledene phosohonate with concentration of 15-23 % used as the mineral salts sediments inhibitors and as the microfertilizers and having the properties to inhibit corrosion. The method provides for interaction of the water solution of the sodium zincate or the potassium zincate with the 20-60 % water solution of the oxyethyledenephosphonic acid at the temperature of 60-80°С. As a rule, the sodium zincate or the potassium zincate are produced by interaction of 5-20 % water solution of the sodium hydroxide or the potassium hydroxide with zinc oxide at the temperature of 50-75°С at the molar relation of 2:1.
 Phosphonate derivatives / 2258707
Invention relates to new biologically active phosphonate compounds. Invention describes phosphonate compound of the formula:
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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-C26. 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
The invention relates to organophosphorus chemistry, namely long-chain alkylphosphonium acids of General formula (Ia, b)having anti-corrosion activity and obtained on the basis of α-olefins industrial fractions of C16-C18and C20-C26
where alkyl = CnH2n+1n=16, 18 (a), n=20, 22, 24, 26 (b). The invention can be used in various industries, in particular, for the protection of pipelines, tanks, construction of metal structures, equipment for production, transportation and refining of oil and gas in the metal. Lower analogues offer long-chain alkylphosphonic acids derived from olefins With6-C10used as wetting, detergent, softener, binding agents, lubricating oil additives (Pudovik A.N., Guryanov IV, Ishmaeva MET the Reactions of addition of phosphorus-containing compounds with a mobile hydrogen atom. // Response and methods of the study of organic compounds / edited Baizakskoe, Elecronica, Shemyakin, LNA, kN. 19. / Chemistry. - M., 1968. - 848 S.) The lowest known alkylphosphonate acid, obtained by the interaction of phosphorous acid with an individual monoolefins (hexene-1, cyclohexene, octene-1, mission-1) in the presence of the lane is xida benzoyl at the boiling point of the olefin (C.E. Griffin, Wells H.J. // J. Org. Chem. 1959. V.24. P.2049; C.E. Griffin // J. Org. Chem. 1960. V.25, N3. - P.665-666). However, the yields of target alkylphosphonic acids low (18-23%), which is associated with the formation of telomeres as by-products in the secondary accession primary alkylphosphonic acids on the double bond C=C olefins. Thus, the path to alkylphosphonium acids by direct phosphorylation of olefins phosphorous acid difficult. Known to produce O,O-dialkylated esters alkylphosphonic acids by reaction of the radical joining O,O-dialkylphosphorous acids to olefins (Pudovik A.N., Konovalov, I. // Joh. 1959. T. No. 10. S-3346; Stiles A.R., W.E. Vaughan, Rust F.F. // J. Am. Chem. Soc. 1958. V.80. N3. P.714-716; patent GB 694772, publ. 29.071953), (patent GB 660918, publ. 14.11.1951, patent US 4108889, publ. 19.11.1976). O,O-dialkyl ethers alkylphosphonic acids used to obtain the corresponding alkylphosphonic acids by hydrolysis with hydrochloric acid (patent GB 660918, publ. 14.11.1951) or treatment of such esters anhydrous chloride or hydrogen bromide, followed by hydrolysis of the resulting chlorine - or Broman-hydrides alkylphosphonic acids (patent US 4108889, publ. 19.11.1976). However, in the literature no information about obtaining long-chain alkylphosphonic acid-based phosphorylation α-olefins industrial fractions of C16-C18and C20-C26and the x application as corrosion inhibitors of steel. The problem of developing an efficient method of processing into useful products industrial high α-olefins, obtained from fractions of hydrocarbons in refinery, currently in our country is important due to the accumulation of a huge number of these α-olefins, low reactivity and not finding to date, the rational use to create commercial products. The technical result - the possibility of recycling industrial factions α-olefins C16-C18and C20-C26in alkylphosphonic acid. Technical result is achieved by the proposed method to obtain mixtures of long-chain alkylphosphonic acids of General formula (1A,b) on the basis of a-olefins industrial fractions of C16-C18or20-C26
alkyl = CnH2n+1n=16, 18 (a), n=20, 22, 24, 26 (b). The invention consists in the fact that α-olefins industrial fractions With16-C18or20-C26(THE 2411-067-05766801-97 and THE 2411-068-05766801-97 production of OJSC "Nizhnekamskneftekhim"), subject to interaction with O,O-dimethylphosphoric acid in a molar ratio of 1:(1.0-2.0) in the presence of benzoyl peroxide in the amount of 1.0-5.0% by weight of O,O-dimethylphosphoric acid at 110-150°is for 10-12 h with stirring in the absence of solvent, followed by hydrolysis of the intermediate high O,O-dimethyl(alkyl) phosphonates hydrochloric acid at 100-110° C for 6-9 hours under stirring, followed by evaporation of the reaction mixture to obtain a solid product containing a mixture of long-chain alkylphosphonic acids C16H33P(O)(OH)2and C18H37P(O)(OH)2or mix With20H41P(O)(OH)2With22H45P(O)(OH)2With24H49P(O)(OH)2and C26H53P(O)(OH)2respectively. For the synthesis of target products of intermediate O,O-dimethyl(alkyl)phosphonates can not be cleaned, which increases the adaptability of the proposed method of obtaining long-chain alkylphosphonic acids (I)which have been tested for corrosion activity without treatment. Conducted gas chromatographic analysis of the composition of the starting olefins industrial fraction C16-C18shows that this fraction contains only hydrocarbons with an even number of carbon atoms, and the total olefin content of the rows With16and C18is 98%. In the fraction of C16-C18there are 2 Bush peaks with retention times 9.67-10.40 min composition C16with the mass number 222 and 12.01-12.68 min composition C18with the mass number 252. The ratio of the peaks of olefins with masses of C16and C18is 3:2. According to the chromatograms and mass spectra established that the total content of α-olefins in the fraction of C16-C1 is 80%. According to NMR spectra1H General content α-olefins in the fraction of C16-C18is not less than 82%. The rest falls on the olefins with internal connection C=C. Mass distribution in the gas chromatograms of fraction C20-C26shows that this fraction contains mainly olefins series C20With22With24and C26in the ratio of 48.6:21.0:14.6:8.6%. The rest falls on the olefin series C18and C28. According to NMR spectra1N the total content of α-olefins in the fraction of C20-C26not less than 85%. Thus, a significant content of α-olefins in fractions of C16-C18and C20-C26leads to a high yield of the target products. The invention is illustrated by the following examples. Example 1. Long-chain alkylphosphonate acid (1A) on the basis of the reaction α-olefin fraction C16-C18with O,O-dimethylphosphoric acid in a 1:1 ratio. A mixture of 33.5 g (140.0 mmol) of olefins industrial fraction C16-C18, 15.5 g (140.9 mmol) of O,O-dimethylphosphoric acid and 0.4 g (1.7 mmol, 2.6% by weight of O,O-dimethylphosphoric acid) of benzoyl peroxide is heated 10-12 hours at 130-140°under stirring. The mixture is washed with water, the organic layer is separated and evaporated in vacuum. Unreacted olefins, Otho Aut of the residue in a vacuum. In the remainder receive 33.6 g of solid, which was diluted with 70 ml of concentrated hydrochloric acid and heated 6-8 h under stirring at 100-110°C. the Solution is evaporated in vacuum. In the remainder receive 27.3 g (81%) solid alkylphosphonic acids (Ia) with TPL 60°C, acid number 139. IR spectrum (KBr, νcm-1): 2921, 2852 ν (CH3as, s; CH2as, s); 2750 cf. W, 2738 cf. W ν (O-N); 2298 O. cf. W2γ (HE); 1720 Ms. O. W, 1640 cf. PU W δ (HE); 1129 O. S. W ν (P=O); 1000 O. ν [R-O(N)]. An NMR spectrum1H (600 MHz, CDCl3the mixture of homologues and isomers, δ, ppm, J, Hz): 0.85 (t, 3H, CH3C,3JHH7.1); 1.28 [m, 28N, (CH2)14CF; N, C(CH2)15CF]; 1.39-1.76 (m, 2H,-CH2R); 9.21 [ush. m; 2H, P(OH)2]. An NMR spectrum31P (C6H6that δP, ppm): 37.1. Mass spectrum (ES)m/z (IRel, %): 306.3 [M]+(13) and 334.3 [M]+(5). Found, %: C 64.71; H 11.61; P 9.37. C16H35About3P and C18H39O3R. Calculated, %: C 62.60 and 64.60; H 11.54 and 11.78; P 10.11 and 9.26. M 306.3 and 334.4. Example 2. Long-chain alkylphosphonate acid (Ia) on the basis of the reaction α-olefin fraction C16-C18with O,O-dimethylphosphoric acid in the ratio 1:2. A mixture of 100.0 g (419.5 mmol) of olefins industrial fraction C16-C18, 87.3 g (793.6 mmol) of O,O-dimethylphosphoric acid and 0.9 g (6.2 mmol, 1.0% by weight of O,O-dimethylphosphate to the slots) of benzoyl peroxide is heated for 12 h at 110-120° With under stirring. The mixture is washed with water, the organic layer is separated and evaporated in vacuum. In the remainder receive 120.5 g of solid, which was diluted with 250 ml of concentrated hydrochloric acid and heated for 8 h under stirring at 100-110°C. the Solution is evaporated in vacuum. In the remainder receive 110.5 g (87%) solid alkylphosphonic acids (Ia) with TPL 59-61°C. Data IR, NMR1H,31P and mass spectra correspond to the spectra of the reference compound (Ia)obtained in example 1. Found, %: C 63.55; N, 11.56; P 9.77. With16H35About3R & s18H39About3R. Calculated, %: C 62.60 and 64.60; H 11.54 and 11.78; P 10.11 and 9.26. M 306.3 and 334.4. Example 3. Long-chain alkylphosphonate acid (IB) on the basis of the reaction α-olefin fraction C20-C26with O,O-dimethylphosphoric acid in a 1:1 ratio. The mixture 146.5 g (454.3 mmol) of olefins industrial fraction C20-C26, 50.0 g (454.5 mmol) of O,O-dimethylphosphoric acid and 5.5 g (22.7 mmol, 5.0% by weight of O,O-dimethylphosphoric acid) of benzoyl peroxide is heated for 10 hours at 140-150°under stirring. The mixture is washed with water, the organic layer is separated and evaporated in vacuum. Unreacted olefins is distilled off from the residue in a vacuum. The residue was diluted with 240 ml of concentrated hydrochloric acid and heated 9 h under stirring at 100-110°C. the Solution is evaporated in vacuum. In the East the ke receive 136.8 g (75%) solid alkylphosphonic acids (IB) in the form of paste. IR spectrum (KBr, νcm-1): 2923, 2854 ν (CH3as, s; CH3as, s); 2744 cf. W, 2735 cf. W ν (O-N); 2356 O. cf. W2γ (HE); 1723 cf. W, 1695 cf. W δ (HE); 1378 Wed δ (CH3s); 1128 n ν (P=O); 1005 acting with ν [R-O(N)]. An NMR spectrum1H (400 MHz, D2Oh, a mixture of homologues and isomers, δ, ppm, J, Hz): 0.90 (t, 3H, CH3C,3JHH7.3); 1.29 (m, SSNS); 1.93 (m, 2H, CLO2R); 8.10 [m, 2H, P(OH)2]. An NMR spectrum31P (C6H6that δP, ppm): 33.1, 33.8 and 36.2 in the ratio of 1:143: 1. Found, %: C 68.37; N, 12.41; P 6.97. With22H47O3R20H43About3R24H51O3R & s26H55O3R. Calculated, %: C at 66.23, 67.62, 68.82 and 69.87; H 11.98, 12.16, 12.31 and 12.44; P 8.55, 7.93, 7.40 and 6.94. Samples of long-chain alkylphosphonic acids have been tested as inhibitors of carbon dioxide corrosion of mild steel using electrochemical cell by bubbling carbon dioxide in the presence of surfactants (neonol) or in its absence (working electrodes MS-R-101S Pattern 44B, the reference electrode Ag/AgCl, pH electrode, temperature sensor, the capillary of Loggia, holes for inserting carbon dioxide and a gas outlet, the composition of the corrosive environment is based on a standard solution ASTM D1144, which includes 24.5 g/l NaCl (98.8%), 0.66 g/l KCl (98.3%), 0.2 g/l NaHCO3(98.0%), 5.2 g/l MgCl2(98.5%), 1.16 g/l CaCl2(98.3%) and 4.09 g/l Na2SO4(983%), in accordance with standard methods (Griffith R. // J. Petroleum Tech. - 1984. - Vol.36, No.3. - P.361-367; J.P. Brill // J. Petroleum Tech. - 1987. - Vol.39, No.1. - P.15-21). Samples of the compounds were made in a standard solution when using single-phase system or in a layer of kerosene or layer of a standard solution using a two-phase system of an organic/inorganic layers in the ratio of 1:9. Found that at a concentration of 10 mg/l of compound (Ia) inhibit corrosion of mild steel at 99.5% after 6 h after application of the inhibitor in the absence of neonols (see table). In the environment of formation of produced water taken from well No. 1010 Zyuzeevskoye field of the Republic of Tatarstan, inhibiting activity of the compounds (Ia) is 94.6% compared to mild steel. Thus, long-chain alkylphosphonate acid, obtained on the basis of the highest industrial α-olefins, are an effective corrosion inhibitor and declare the retrieval method solves the problem of disposal of industrial waste into useful products.
1. A method of producing mixtures of long-chain alkylphosphonic acids from α-olefins industrial fractions of C16-C18and C20-C26that includes (a) interaction α-olefins industrial fraction C16-C18or20-C26with O,O-dimethylphosphoric acid in a molar ratio of 1:(1.0 to 2.0) in the presence of catalytic amounts of benzoyl peroxide, taken in an amount of 1.0 to 5.0% by weight of O,O-dimethylphosphoric acid, at 110-150°C for 10-12 h with stirring in the absence of solvent, with subsequent washing with water the organic layer and the distillation of the unreacted olefins with obtaining higher intermediate O,O-dimethyl(alkyl)phosphonates; b) hydrolysis of the intermediate high O,O-dimethyl(alkyl)phosphonates of concentrated hydrochloric acid at 100-110°for 6-9 h under stirring, followed by evaporation of the reaction mixture to p the receipt of solid residue. 2. The product, containing a mixture of long-chain alkylphosphonic acids With16H33P(O)(OH)2and C18H37P(O)(OH)2or a mixture of C20H41P(O)(OH)2With22H45P(O)(OH)2With24H49P(O)(OH)2and C26H53P(O)(OH)2obtained by the method according to claim 1 of the α-olefins industrial fraction C16-C18or20-C26accordingly, as corrosion inhibitor for mild steel.
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