The Technology of Integrated Cleaning of Fire-Resistant Oils

Fire-resistant turbine oils on the basis of triaryl phosphate are subjected to hydrolysis with the formation of acids and phenols during operation at power stations in control and lubrication systems of power units. This increases acid number (AN) and leads to the formation of gum deposits on equipment. The process of decreasing AN in waste Reolube OMTI fire-resistant liquids with AN above 1.5 mg KOH/g, using the hydroxyl flor of AV-17-8chS anion resin, was investigated in this work. It has been demonstrated that, on keeping a fire-resistant liquid at a temperature of 70°С for 2 h, its AN can be reduced from 2.67 to 0.03 mg KOH/g. Decreasing the temperature below 60°С drastically reduces the acid neutralization rate. The rate of acid neutralization also drops sharply on a decrease in AN of a fire-resistant liquid and exhaustion of the exchange capacity of the anion resin. This makes unprofitable the neutralization of acids in oils with AN below 0.05 mg KOH/g using ion-exchange resin. The exchange capacity of anion resin also cannot be completely exhausted. Vacuum drying of neutralized oil at 70°С and a residual pressure of 0.01 MPa yields oil with a water content below 0.03%.