Chromium-based catalyst component and its preparation method and chromium-based catalyst
A chromium-based catalyst and co-catalyst technology, applied in the field of olefin polymerization, can solve the problems of non-occurrence and wide molecular weight distribution of polymers, and achieve the effects of wide molecular weight distribution, high polymerization activity and high melt index
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[0064] According to one embodiment of the present invention, the ethylene polymerization reaction adopts a slurry polymerization process. Generally, an inert alkane can be selected as a diluent so that the polymer particles can be dispersed in the diluent in the form of a slurry. After the reaction The diluent was removed by flash evaporation or filtration. Common diluents are propane, isobutane, pentane, hexane and heptane. Typical polymerization reaction conditions include: the polymerization temperature is 20°C-250°C, preferably 50°C-160°C; the polymerization pressure is 0.1-10 MPa, preferably 0.5-8.0 MPa. Hydrogen can be used during polymerization to adjust the melt index and molecular weight of the polymer.
[0065] According to another embodiment of the present invention, the ethylene polymerization reaction adopts a gas phase polymerization process including stirring or fluidized bed. Generally, the conditions of the polymerization reaction include: the polymerization...
Embodiment 1
[0073] This example is used to illustrate the chromium-based catalyst component of the present invention and its preparation method.
[0074] Add 10 g of silica gel and 150 mL of hexane into the reactor, stir at room temperature to form a suspension, and then add 4 mmol of 2-isopropyl-4,4,5,5-tetramethyl-1,3,2- Dioxaborolane, continue to stir for 2 hours, let it stand to remove the solvent, and obtain the reactant, then add 200mL toluene solution containing 1.2g of chromium acetylacetonate to the reactant for impregnation, stir and react at room temperature for 4 hours, remove The solvent yields a chromium-containing precatalyst component. Activation by placing the precatalyst component in a 1.75 inch quartz tube with a sintered quartz disc at the bottom: Load the precatalyst component onto the disc and blow upward with dry air at a linear rate of approximately 1.6-1.8 scf / hr Pass through the tray, turn on all the electric furnaces around the quartz tube, raise the temperatur...
Embodiment 2
[0076] This example is used to illustrate the chromium-based catalyst component of the present invention and its preparation method.
[0077] Add 1.2 g of chromium acetylacetonate and 200 mL of toluene into the reactor, and stir at room temperature to completely dissolve the solid to form a solution. Add 10 g of silica gel to the above solution, stir for 1 hour, add 4 mmol of 2-isopropyl-4,4,5,5-tetramethyl-1,3,2-dioxaborolane, and stir at room temperature After 2 hours of reaction, the solvent was removed to obtain a chromium-containing precatalyst component. Activation by placing the precatalyst component in a 1.75 inch quartz tube with a sintered quartz disc at the bottom: Load the precatalyst component onto the disc and blow upward with dry air at a linear rate of approximately 1.6-1.8 scf / hr Pass through the tray, turn on all the electric furnaces around the quartz tube, raise the temperature to 800°C at a rate of 300°C per hour and calcinate for 6 hours to obtain the ch...
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