ACID CORROSION INHIBITORS IN CHEMICAL TECHNOLOGY OF FUEL AND HIGH ENERGY SUBSTANCES BASED ON SALTS OF SULFATED OLEIC ACID AMIDES
At present, the destruction of metal equipment is one of the most important problems in the chemical technology of fuel and high-energy substances. There is a need for new, more effective corrosion control agents. The most aggressive environments are common in the petrochemical industry (oil, oil and gas, oil refining, etc.). To protect the equipment of the pipeline, nitrogen-containing compounds, in particular ammonium salts, are increasingly being used. Inhibitors based on organic compounds are of interest.This work is a continuation of studies series on the corrosion inhibitors preparation based on carboxylic acids. A method for the synthesis of acid corrosion inhibitors based on oleic acid amides has been developed. The reason for the slowdown in corrosion is the adsorption capacity of organic surface-active compounds (surfactants). This is due to the overlap of the contacting surface of the metal with the medium and a change in the activation energy in free areas. The basis of the developed inhibitors is oleic acid (OА) - an organic fatty compound that exhibits surfactant properties. It is known that the content of nitrogen, sulfur and oxygen increases the protective ability, therefore, several syntheses were carried out to increase its inhibitory properties. Substances were obtained in several stages. At the first stage, amino alcohols were added to OА, then the resulting compounds were sulfonated with sulfuric acid. To expand the types of various inhibitors, reactions with bases were carried out. As a result, salts of sulfated amides of oleic acid synthesized with amino alcohol, sulfuric acid, and aqueous solutions of bases were formed. To determine the effectiveness of the obtained compounds, the protective ability in dilute hydrochloric acid was evaluated. It was found that some of the obtained substances exhibit the corresponding properties of inhibitors. The most effective is the ammonium salt of sulfated diethanolamide oleic acid.