关键词: 乙烯, 石油树脂, 阳离子聚合反应, 三氯化铝?, 三氟化硼

Abstract: C5 fraction from ethylene plant contains a large number of linear unsaturated molecules and cyclopentadiene with mass fraction of more than 16%. A light-colored petroleum resin can be obtained from reaction of C5 fraction using BF3 as catalyst. Cyclopentadiene should be first removed when its concentration is high，so the softening point of the resin would not be too high. Using ethylene plant by-product C5 fraction as raw material，the effect of BF3 and AlCl3 mass ratio，catalyst amount，reaction temperature on C5 petroleum resin softening point and yield was investigated. The optimal catalytic activity was attained through mass ratio of boron trifluoride to anhydrous aluminium trichloride 7∶3，mass ratio of catalyst to total raw material 2%，reaction temperature 40 ℃ for 4 h. Under optimal conditions mass yield was 56.6%，chromaticity was 6—7，softening point was 101 ℃. The light-colored C5 petroleum resin can be directly used in printing ink and rubber.

Key words: ethylene, petroleum resin, cationic polymerization, aluminium chloride, boron trifluoride