论文部分内容阅读
采用氧化铬催化剂进行乙烯聚合有三种方法:溶液法、悬浮法和气相法。用溶液法和悬浮法进行乙烯聚合时,一般需在60—170℃下,并要使用烃类稀释剂。在进行气相聚合时,则不需使用稀释剂,在低于120℃的条件下进行反应,直接得到粉末状聚合物,在工艺上该方法比溶液法或悬浮法有很大的优越性。本文研究了以高效氧化铬催化剂进行乙烯气相聚合,并以不同方法调节聚合物分子量。试验所采用的氧化铬催化剂含铬0.5—2.5％,以硅
There are three ways of using chromium oxide catalyst for ethylene polymerization: solution, suspension and gas phase. When using the solution and suspension polymerization ethylene polymerization, generally need to 60-170 ℃, and to use hydrocarbon diluent. In the gas phase polymerization, the method does not require the use of a diluent, and the reaction is carried out under a condition of less than 120 DEG C to directly obtain the powdery polymer. The method has great advantages over the solution method or the suspension method in the process. In this paper, we studied the vapor phase polymerization of ethylene with a high-efficiency chromium oxide catalyst and the polymer molecular weight was adjusted in different ways. Chromium oxide catalyst used in the experiment contains chromium 0.5-2.5%, with silicon