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The core of the Spherilen process is its catalyst technology. The spherical titanium catalyst used in this technology shows a three-dimensional space in terms of physical and chemical structure, can artificially control the physical and chemical properties of the carrier itself, and control the distribution of the active center on the carrier. The principle is: by controlling the porosity of the carrier, the active center is preferentially distributed on the surface, so that the monomer diffusion capacity is limited, so that layered or hollow polymer particles can be obtained during the polymerization process, and the particle itself becomes a The reactor, the other monomers introduced therein, can be polymerized or copolymerized under the action of the active center inside the hollow particles, thereby producing a very uniformly dispersed polymer blend or polymer alloy. With different monomer formulations, homopolymers, copolymers, elastomers, and other functional polymers can be obtained.
The latest domestic PE plastic granulator research progress
With the advancement of the catalyst technology, there has now emerged a technique for producing a spherical PE resin that does not require further granulation directly from a polymerizer. The direct production requires no granulation resin, which not only saves a large amount of energy-consuming steps such as extrusion granulation, but also results in no morphological changes in the low crystalline product obtained from the reactor, which is advantageous for shortening the processing cycle and saving processing energy. Montell's Spherilene process uses titanium-based catalysts supported on MgCl2. The pellets of PE pellets with a density of 0.890-0.970 g/cm3 are produced directly from the reactor. The products include LDPE, LLDPE and HDPE, even without reducing the production capacity of the device. VLDPE and ULDPE are produced under the circumstances. Due to the elimination of the granulation process, the plant investment can be reduced by 20%. The process combines slurry prepolymerization with gas-phase fluidized bed technology. The reaction is first performed in a small loop reactor. The prepolymer is then passed continuously through one or two gas-phase fluidized beds with short residence times. Each gas-phase fluidized bed can control and maintain a completely independent gas composition. The temperature and pressure can be independently controlled, which enables greater product design flexibility.