With the advancement of Catalyst techniques, the technique of spherical PE resins, which are indirectly made from polymerization kettles without further granulation, has now been presented. Indirect basin does not need granulation resin, not only can save a large number of energy-consuming extrusion granulation and other steps, and the low crystallization products obtained from the reactor do not produce state changes, which is conducive to prolonging the processing cycle, thrifty processing energy. The Montell company's Spherilene process adopts a titanium catalyst loaded on the MgCl2, and the product comprises LDPE, LLDPE and HDPE, indirectly from the reactor, with a density of 0.890-0.970g/cm3 of PE spherical particles. Even in the case of not low assembly of the basin talent, the basin VLDPE and ULDPE. By eliminating the granulation process, the assembly investment can be reduced by 20%. The process combines the technique of silting with the technique of gas phase fluidized bed, and the reaction is carried out first in a small ring tube reactor, and then the Prepolymer continues through the gas phase fluidized bed with one or two short residence times during the process, and the gas composition of two gas-phase fluidized bed can control and maintain complete self-reliance, and the temperature and pressure can Greater flexibility in product design is achieved.
The focus of the Spherilen process is its catalyst technique. The spherical titanium catalyst used in this technique shows the characteristics of three-dimensional space in physical and chemical structure, and can be paid to control the physical and chemical function of the carrier itself, and to control the dispersion of the active middle on the carrier. The reason is: through the process of control of the porosity of the carrier, so that the active intermediate priority is scattered outside, so that the evacuation of the monomer can be limited, so that in the polymerization process can be obtained layered or hollow polymer particles, and the particles themselves become a reactor, the introduction of other monomers, It can be polymerized or copolymerization under the active middle of the outer part of the hollow particles, so that an abnormal average of the polymerization blends or polymer alloys are evacuated. By adopting different monomer formulations, aggregates, copolymers, elastomers and other functional polymers can be obtained.
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