Using common quality specifications, the prediction equations for calculation motor octane number (MON) and research octane number (RON) were proposed, including distillation range, density, aromatic content, and olefinic content or bromine value. From a large number of refineries and literature data, about 70% of the sample error is less than 1.2 when MON is calculated directly by means of these prediction equations, and more than 81% of error is less than 1.8 by RON being calculated. Therefore, the ON can be calculated by these equations. It shows that the error of the prediction equations meet the standard requirement. The equations are a rapid, simple and wide-application method for the calculation of ON. They have something referential values for product quality control in petroleum refinery operation．

Based on the experimental program of uniform design, PAC coagulation treatment for COD contained in industrial wastewater samples was studied. Effects of PAC dosage, pH and COD concentration of the sample on the COD removal rate (Y, % COD removal) and efficiency (Z, COD removed per PAC) were determined in 10 test runs for wastewater. Non-linear multi variable regression equations were defined to correlate Y and Z with the influencing factors. COD removal, Y and Z were correlated with pH, the best pH is 6~8. COD removal and Y are increased with COD concentration of the sample, the optimizing parameters was correlated with COD concentration of the sample. Z is decreased with the increase of PAC dosage. The optimum PAC dosage was determined by experiment in order to optimize the process conditions.