INSTALLATION AND PROPYLENE POLYMERIZATION copolymerization of propylene with ethylene and POLYPROPYLENE AND METHOD FOR PRODUCING propylene-ethylene copolymer

摘要

FIELD: chemistry.;SUBSTANCE: invention relates to a technology of production of polypropylene and a copolymer of propylene with ethylene and deals with the field of enhancement and modernisation of the industrial suspension process. Described is a device for a suspension process of polymerisation of propylene or propylene and ethylene in the presence of a catalytic Ziegler system in a medium of a hydrocarbon solvent and hydrogen as the molecular weight regulator. The device contains technological sections connected to each other by technological tubing. Additionally it includes a section of recycling a solvent centrate part in polymerisation reactors and a section of vegetable oil dosing in a stream of the centrate, which is supplied in a section of the solvent separation from an atactic polymer. Partial and regulated centrate recycling from 10 to 50% to the total centrate volume is carried out. Described is a method of obtaining polypropylene at a temperature of 10-90°C and the pressure of propylene of 1-30 atm. The catalytic system includes a titanium magnesium catalyst of the grade LYNX, triethylaluminium, methylcyclohexyldimethoxysilane. The concentration of triethylaluminium is (0.2÷1.0) g/l. Polypropylene is obtained at the molar ratio of Si/Ti=1÷10, and the copolymer of propylene and ethylene at molar ratios of Si/Ti=10÷30.;EFFECT: modernisation of a technological scheme of the propylene polymerisation installation, as well as ensuring high efficiency of exploitation of the catalytic system of the fourth generation.;8 cl, 5 dwg, 12 tbl, 27 ex