The core equipment of the process is MZCR (multi zone circulation reactor system) reactor R230 system. The reactor consists of riser and downcomer. In the riser, the polymer is blown upward through the reaction gas to form fluidization, which is sent to the upper part of the downcomer to pass through the cyclone separator, and the powder is collected in the downcomer. The reaction gas is circulated by the centrifugal compressor through the external pipeline, and the reaction heat is removed by the circulator cooler on the external circulation pipeline. The reactor product is discharged through a valve installed at the lower part of the downcomer. After degassing under high and low pressure, the discharged powder is evaporated and dried directly when homopolymer and random copolymer are produced. During the production of impact resistant products, the powder after high-pressure degassing is discharged into the gas-phase fluidized bed reactor. This reactor still adopts Spheripol II gas-phase reactor system. The copolymerization reactor is a vertical cylindrical vessel, with spherical head at the top and bottom, boiling bed at the bottom, stainless steel as the main material and polished inner surface.
At present, the largest single line production capacity of the process has reached 450000 tons / year. The ethylene content of MZCR impact copolymer can be as high as 22% (rubber content is more than 40%), and it can also produce terpolymer containing ethylene and butene-1.
