NOVEL Α-AMINOPHOSPHONATES, HAVING ANTICORROSION ACTIVITY, AND A METHOD FOR PRODUCTION THEREOF Russian patent published in 2019 - IPC C23F11/167 

FIELD: chemistry.

SUBSTANCE: invention relates to chemistry of organophosphorus compounds and protection of metals from corrosion and can be used to protect metals from carbon dioxide, hydrogen sulphide or mixed corrosion. Claimed α-aminophosphonate of general formula

where R¹=i-C₉H₁₉-C₆H₄-(OCH₂CH₂)_n, (n=4, 6, 8, 9,10; 12, 14, 15); R²=-H, -CH₃, -CH₂-CH₃; -CH(-CH₃)₂; R³, R⁴=H, -CH₂-CH₃, -CH₂-CH₂-OH, Ph, -CH₂-CH₂-O-CH₂-CH₂-, morphil, -(CH₂)_m-CH₃ (m=2-16), -(CH₂-CH₂-NH)_p-H (p=1-6), having anticorrosion activity with respect to carbon dioxide and hydrogen sulphide corrosion. Method of its production is carried out in three stages: 1) reaction of oxyethylated alkylphenol or a mixture of oxyethylated alkylphenols with 5–10 % excess of phosphorus trichloride with subsequent distillation of unreacted phosphorus trichloride; 2) reacting the obtained product with not less than 5 % excess alcohol for at least 10 min with subsequent distillation of the formed hydrogen chloride, chloroalkane and excess alcohol; 3) reaction of the obtained product with formaldehyde and amines of different structure in molar ratio of 1:1:1 while stirring for at least 60 minutes and temperature of not less than 60 °C.

EFFECT: obtaining new α-aminophosphonates having high anticorrosion effect up to 99 % at low concentrations.

10 cl, 4 tbl, 24 ex