颗粒持液条件下乙烯/1-辛烯共聚合行为研究  

Ethylene/1-Octene Copolymerization Characteristics under the Condition of Particle Liquid-Holding

作　　者：杜焕军 Du Huanjun(Sinopec(Tianjin)Petrochemical Co.,Ltd.,Tianjin 300270,China)

机构地区：[1]中石化(天津)石油化工有限公司,天津300270

出　　处：《广东化工》2024年第9期17-20,共4页Guangdong Chemical Industry

摘　　要：本文考察了不同反应条件对乙烯/1-辛烯共聚合行为以及聚合产品的影响。结果表明,在不存在惰性冷剂的条件下,1-辛烯在共聚体系中亦发挥了冷剂的作用,可提高乙烯在活性位点周围的局部浓度,使得聚合活性随1-辛烯浓度的增加而增加;而在加入惰性冷剂后,共聚单体效应令乙烯在共聚反应中插入速率降低。同时,反应中随着共聚单体浓度的增加,聚合产品中1-辛烯支链含量也逐渐增加,这是由于随着1-辛烯的加入,其在催化剂活性位点处的浓度也提高,1-辛烯在聚合反应中的插入率增大。据此可确定优选的反应温度。In this work,the effects of different reaction conditions on the ethylene/1-octene copolymerization behavior and polymerization products are studied.The results showed that in the absence of inert condensate,1-octene also played the role of a condensing agent in the copolymerization system,which increased the local concentration of ethylene around the active sites of particles,leading to the increase of polymerization activity with the 1-octene concentration.In the present of inert condensate,the comonomer effect reduced the ethylene insertion rate during the copolymerization reaction.Moreover,as the comonomer concentration increased during the reaction,the 1-octene branch content in the polymerization product was also gradually increased.This was because with the addition of 1-octene,its concentration around the active sites of catalyst was also increased,which enhanced the insertion ratio of 1-octene in the polymerization reaction.By this way,the optimal reaction temperature can be determined.

关 键 词：聚乙烯 1-辛烯 惰性冷剂 协同作用 共聚单体效应 

分 类 号：TQ[化学工程]