New α-Aminophosphonates as Corrosion Inhibitors for Oil and Gas Pipelines Protection

The problem of corrosion of metal equipment is one of the most actual problems in oil industry. One of the methods to solve this problem is the development of new low-toxic, accessible and effective corrosion inhibitors. For this purpose, we carried out the synthesis of the new α-aminophosphonates based on syntanyl phosphites, formalin and diethanolamine according to the Kabachnik-Fields reaction. The resulting products are characterized by ۱H, ۳۱P, ۱۳C NMR, IR and mass spectroscopy methods. The obtained compounds contain a long radical chain of industrial (poly)ethoxylated alcohol residue with different length of the hydroxyethyl fragment, as well as an active center containing O-P-C-N fragment, which impart them inhibitory properties toward corrosion processes. The anticorrosive activity of the new aminophosphonates was studied by gravimetric analysis method. In the article the effect of concentration, time and degree of ethoxylation of the hydrocarbon radical in alpha-aminophosphonates on the protective effect of inhibitors was studies. It was shown that the obtained aminophosphonates exhibit high values of the protective effect of steel in a highly mineralized medium containing ۲۵۰ g/m۳ СО۲ and ۲۰۰ g/m۳ Д۲S. The high value of the protective effect (۸۲-۸۵ %) at inhibitor concentration of ۲۵ mg/l was found. The maximum protective effect at ۵۰ mg/ml dosage of the inhibitor is ۹۴.۳ %, while there is a decrease of the corrosion rate (less than ۰.۰۴ mm/year).The problem of corrosion of metal equipment is one of the most actual problems in oil industry. One of the methods to solve this problem is the development of new low-toxic, accessible and effective corrosion inhibitors. For this purpose, we carried out the synthesis of the new α-aminophosphonates based on syntanyl phosphites, formalin and diethanolamine according to the Kabachnik-Fields reaction. The resulting products are characterized by ۱H, ۳۱P, ۱۳C NMR, IR and mass spectroscopy methods. The obtained compounds contain a long radical chain of industrial (poly)ethoxylated alcohol residue with different length of the hydroxyethyl fragment, as well as an active center containing O-P-C-N fragment, which impart them inhibitory properties toward corrosion processes. The anticorrosive activity of the new aminophosphonates was studied by gravimetric analysis method. In the article the effect of concentration, time and degree of ethoxylation of the hydrocarbon radical in alpha-aminophosphonates on the protective effect of inhibitors was studies. It was shown that the obtained aminophosphonates exhibit high values of the protective effect of steel in a highly mineralized medium containing ۲۵۰ g/m۳ СО۲ and ۲۰۰ g/m۳ Д۲S. The high value of the protective effect (۸۲-۸۵ %) at inhibitor concentration of ۲۵ mg/l was found. The maximum protective effect at ۵۰ mg/ml dosage of the inhibitor is ۹۴.۳ %, while there is a decrease of the corrosion rate (less than ۰.۰۴ mm/year).