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在开放和密闭体系中,使用载体高效催化剂,研究了丙烯聚合动力学。所得动力学曲线都是衰减型的。讨论了聚合温度、丙烯分压和Al/Ti等对聚合速度的影响。本催化剂最大特点是活性高初速大。当浆液浓度超过50克聚丙烯/升,必须考虑扩散作用的影响。如在密闭体系中,聚合速度可用-dP/dt=k_1(P/(f(Q)))表示,积分式为log P=-k log t。其活化能为8.0千卡/克分子。还讨论了给电子体苯甲酸乙酯(EB)在聚合过程中的作用机理。发现在聚合过程中,有一部分EB由催化剂转入液相。EB对催化剂的定向度和活性起重要的调节作用。
In an open and closed system, the kinetics of propylene polymerization was investigated using a supported high-efficiency catalyst. The resulting kinetic curves are attenuated. The effects of polymerization temperature, partial pressure of propylene and Al / Ti on the polymerization rate were discussed. The most prominent feature of this catalyst is high activity and high velocity. When the slurry concentration exceeds 50 gpolypropylene / liter, the effect of diffusion must be considered. As in a closed system, the polymerization rate can-dP / dt = k_1 (P / (f (Q))) said, the integral log P = -k log t. Its activation energy is 8.0 kcal / mol. The mechanism of action of electron donor ethyl benzoate (EB) during polymerization was also discussed. It was found during the polymerization that a portion of EB was transferred from the catalyst to the liquid phase. EB plays an important regulatory role on the orientation and activity of the catalyst.