Abstract: The process of determining diene value of petroleum products by maleic anhydride addition reaction was studied. The results show that the boiling point of the solvent, sealing quality and the length of the stand-by time after the addition reaction are important factors for measuring diene value of petroleum products. Several key technical issues during the process of diene value determination based on the Diels-Alder reaction principle are indicated. The improvement for the national or industrial standard method is suggested.

Key words: petroleum products, diene value, addition reaction, Diels-Alder reaction