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Development of light-colored C5 Petroleum Resin by Complex Catalyst

author£ºadmin Date£º2016/12/16 17:38:40

In a 1000ml three-necked flask equipped with a reflux condenser, thermometer and electric stirrer, an appropriate amount of complex catalyst and a certain amount of toluene were added and stirred until the temperature of the system reached a predetermined value. Of the C5 raw materials, after the completion of a certain temperature and then the reaction of 3 to 4 hours. After washing, unreacted materials and oligomers were removed by vacuum distillation to obtain a light-colored C5 petroleum resin with high transparency.

(1) Refining of raw materials
There are many factors affecting the hue of petroleum resin, and the content of cyclopentadiene is the main influencing factor, besides the process conditions. When the content of cyclopentadiene in the C5 fraction is high, the petroleum resin hue resulting from the polymerization is high (7 / Gardnar grade). Therefore, the raw materials should be treated before polymerization. According to the high boiling point of dicyclopentadiene produced by thermal polymerization and thermal polymerization, cyclopentadiene is removed by thermal polymerization in this work. Temperature of 120-125 ¡æ, pressure of 0.65-0.70MPa and time of 1h. Cyclopentadiene can be removed by distillation after thermal polycondensation. The dicyclopentadiene <1% and cyclopentadiene <5% in C5 after cleavage. The light components before 70 ¡æ were cut from the raw materials after heat-polymerization. The light-colored C5 petroleum resin was obtained by polymerization, and the heavy component was more than 70 ¡æ, and the dark petroleum resin was obtained by polymerization.

(2) Polymerization process conditions
The catalyst is a yellowish transparent liquid, insoluble in the reaction solvent and reaction products, and has strong catalytic activity and is easy to be separated from the reaction product of the complexing agent and the AlCl3, which is prepared by using the nitro compound with strong polarity as the complexing agent.

(3) Post-treatment process
Post-treatment mainly includes the removal of catalyst and resin refining. As the complexing agent used is not mutually soluble with the reaction product and the solvent, the reaction liquid is allowed to stand to remove most of the catalyst, the remaining upper reaction product is washed with 5% NaOH solution and then washed with water to neutrality to remove the residual catalyst. Atmospheric distillation and vacuum distillation can obtain light-colored C5 petroleum resin.