Corrosion inhibitors based on modified second-use oily freedstock

Анотація

It has been proposed to use products of chemical transformation of secondary fatty raw materials (phosphatidic concentrate of sunflower oil, waste cooking oil, etc.) to expand the range of domestic corrosion inhibitors [1–3]. Fatty acid aminoamides were synthesied by epoxidation of unsaturated fatty acids (oleic, linoleic, linolenic, erucic) or their mixtures, which are part of oils (rapeseed, sunflower, corn, soybean, linseed, etc.), followed by opening of the oxirane cycle and transamidation of acylglycerols with diethanolamine. The effectiveness of the synthesized emulsifier-inhibitor and preservative oils was tested in accordance with GOST 9.054. The essence of the method consists in exposing a steel plate (St.10) coated with the material under investigation to a salt mist atmosphere at a temperature of 35±5 °C, or in a salt mist chamber, or 08KP steel plate in an electrolyte until the first signs of corrosion appear (hours), as well as plate made of St.3 in saturated solutions of hydrogen sulphide ([H₂S] – 400 mg/l) or carbon dioxide ([CO₂] – 1200 mg/l). The presence in phospholipid molecules of a voluminous hydrophilic part, formed by the polar residues of phosphoric acid and amines, contributes to their dispersion in water, while the hydrophobic aliphatic chains of higher carboxylic acids give them affinity for organic solvents.