A Study on the Prediction Model for the Lubricity of Hydrogenated Ultra-low Sulfur Diesel Fuel

The physicochemical properties of hydrogenated diesel fuel and its fractions produced by hydro-refining, hydro-upgrading, and hydro-cracking were analyzed. The lubricity of diesel fuel and its fractions were measured by a high-frequency reciprocating rig. The relationships of lubricities between the fractions were discussed. The prediction model for the lubricity of hydrogenated diesel with a sulfur content below 200 g/g was established by using the stepwise linear regression method. The coefficient, R, reached up to 0.981, and the relative error of the predicted value to the actual value was less than 7%. According to the coefficients of the prediction model, the lubricity of ultra-low sulfur diesel with high kinematics viscosity, high nitrogen content, and low cycloparaffins content under the condition of deep hydrogenation was relatively inferior. The model could well predict the lubricity of the ultra-low sulfur diesel fuel and hydro-fining diesel fuel.