Gas-phase polymerization method for producing alpha-olefin copolymer

• Main Authors: DAI JINSONG, ZHANG PENGFEI, WANG JINGYU, ZHANG JUNWEI, WANG ZHIWU, LI SHUXING, MA QINGLI, LI HUASHU
• Format: Patent
• Language: Chinese; English
• Published: 11.12.2018
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP

The invention provides a gas-phase polymerization method for producing an alpha-olefin copolymer. The method comprises the steps of copolymerizing an alpha-olefin monomer with other one or more alpha-olefin monomers in one or more horizontal gas-phase reactors arranged in series by using an olefin polymerization catalyst component, at least one organic aluminum compound and an optional external electron donor compound; and determining a maximum value (that is a rubber content critical value) of a rubber content of polymer powder in a critical flow state in the reactors according to a quantitative relation between an olefin polymerization catalyst component index and an horizontal gas-phase reactor parameter. Through selection for the pre-polymerization catalyst component and adjustment forthe reactor parameter, the effect that the rubber content of the produced alpha-olefin copolymer product approaches but does not exceed the critical value can be implemented, thereby being beneficialto obtaining optimal econ