Vanadium-based catalyst system for olefin polymerization
A technology for olefin polymerization and catalyst, applied in the field of vanadium-based catalyst system
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Embodiment 1
[0030] Propylene and ethylene monomers are in a certain molar ratio (C 3 / C 2 =2.0) was mixed with hexane to form a monomer solution ([M]=57g / L). At -45°C, add VOCl 3 , EtAl 1.5 Cl 1.5 And the catalyst of 2-chloro-2-methylpropane (abbreviated as TB), wherein, the V / M molar ratio is 5.1×10 -4 , the Al / V molar ratio is 20, and the TB / V molar ratio is 5. After 10 minutes of polymerization reaction, 5% hydrochloric acid ethanol solution was added to terminate the reaction, and the obtained polymer was vacuum-dried at 40° C. to constant weight to obtain an ethylene-propylene copolymer. The catalytic activity is 21kg·(mol -1 V), the propylene content in the copolymer is 53mol% (63wt%), and the random sequence distribution content is 67%.
[0031] Compared with Comparative Example 1, under the close situation of obtaining propylene content in the multipolymer, the consumption of propylene in the monomer has reduced by 23%, and the utilization efficiency of propylene has improv...
Embodiment 2
[0033] Propylene and ethylene monomers are in a certain molar ratio (C 3 / C 2 =2.1) was mixed with hexane to form a monomer solution ([M]=59g / L). At -45°C, add VOCl 3 , EtAlCl 2 / Et 2 The catalyst of AlCl and 1,1,1-trichloroethane (abbreviated as TC), wherein the V / M molar ratio is 2.5×10 -4 , the Al / V molar ratio is 15, and the TC / V molar ratio is 20. Polymerization reaction 10 minutes, termination and aftertreatment mode are with embodiment 1, obtain ethylene-propylene copolymerization product, catalytic activity is 52kg (mol -1 V), the propylene content in the copolymer is 34mol% (46wt%), and the random sequence distribution content is 55%.
[0034] Compared with Comparative Example 2, when the propylene content in the obtained copolymer is close, the propylene content in the monomer has decreased by 16%, the propylene utilization efficiency has improved, and the catalytic activity has improved by 27%; co-catalyst consumption (in Al / M ratio Expressed) decreased by 46...
Embodiment 3
[0036] Mix 5-ethylidene-2-norbornene (ENB), propylene, and ethylene monomers in a certain molar ratio (ENB / C 3 / C 2 =0.1 / 4.2 / 1) was mixed with hexane to form a monomer solution ([M]=50g / L). At -45°C, add VOCl 2 (Me 2 C 6 h 3 O), EtAlCl 2 / Et 2 The catalyst of AlCl and TC, wherein, the V / M molar ratio is 6.1×10 -4 , the Al / V molar ratio is 30, and the TC / V molar ratio is 2. Polymerization reaction 10 minutes, termination and aftertreatment mode are with embodiment 1, obtain ethylene-propylene-ENB copolymerization product, catalytic activity is 20kg (mol -1 V), the ethylene conversion rate is 97%, the propylene conversion rate is 20%, the propylene content in the copolymer is 45mol% (55wt%), the ENB content is 4.4mol% (14wt%), and the random sequence distribution content is 72%.
[0037] Compared with Comparative Example 3, under the same polymerization conditions, the utilization efficiency of ethylene, propylene and ENB all increased, and the catalytic activity increa...
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Abstract
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