Real-Time Detection of Atmosphere Composition in Three-Component Gas-Phase Copolymerization of Olefins

摘要

The uniformity of copolymer composition has a great influence on its properties; however, it is very difficult to control. Especially in the laboratory research of the multi-component gas-phase copolymerization of olefins, the polymerization is usually conducted in a batch reactor, and the composition of the resulting copolymers is often distributed very widely. The samples of such copolymers are in fact not representative. Detection and control of the atmospheric composition in the batch reactor during olefin gas-phase copolymerization is of great significance for the control of the uniformity of copolymer composition. In this work, a method based on three flow meters in series has been developed for real-time detection of the atmospheric composition in olefin gas-phase copolymerization with a delay time of less than 3s. The method is applicable to copolymerization of up to a ternary system, including the binary copolymerization of olefins with hydrogen modulation of molecular weight or the ternary copolymerization of olefins. The consumption rate of each monomer is also online measured.