GAS-PHASE POLYMERIZATION OF OLEFINS UTILIZING A DOUBLE CATALYTIC SYSTEM

• Main Authors: REJCHMEHNN MARK G, KREHJDER DEHVID R, STRIKI DZHEROM A, LIN CHI-KHANG
• Format: Patent
• Language: English; Russian
• Published: 10.08.2007
• 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

FIELD: polymerization processes. ^ SUBSTANCE: invention relates to a process of gas-phase polymerization of olefins conducted in a separate horizontally arranged reactor and describes gas-phase (co)polymerization of propylene in reactor with piston-driven two-phase stream wherein at least one monomer stays in contact with catalytic system including: magnesium halide-supported titanium component; organoaluminum component wherein components of catalytic system are added through inlet ports located axially along the reactor; and two external electronodonor components, in particular organosilicon compounds. Subject-matter of invention consists in that addition of the first external electronodonor component to reactor is accomplished through axially arranged inlet port located near the inlet port for component comprising supported Ti-containing component and addition to reactor of at least one second external electronodonor component showing higher stereo-controlling ability than first component is accomplished through axially arranged inlet port located downstream of the inlet port for the first external electronodonor component. A gas-phase process of propylene (co)polymerization in cylindrical horizontal reactor with piston-driven two-phase stream essentially in fluidized bed is described, wherein at least one monomer stays in contact with catalytic system including: titanium component supported by magnesium halide; organoaluminum component, and at least one external silicon-containing silicon-containing electronodonor component, in which process catalytic system components are added through inlet ports arranged axially along reactor, addition of the first external electronodonor component to reactor is accomplished through inlet port located axially near the inlet for supported transition metal-containing component and addition of at least second external silicon-containing electronodonor component, showing higher stereo-controlling ability than first component is accomplished through a port located at a distance constituting at least 25% the length of reactor and downstream of the inlet port for the first external electronodonor component. ^ EFFECT: enabled preparation of high-stereoregular propylene homopolymers and propylene-based copolymers. ^ 10 cl, 2 tbl, 3 ex