Process for the polymerization of ethylene
一种工艺、乙烯的技术，应用在气相工艺领域，能够解决不容易实现、无效、化学助剂不可预测等问题
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Embodiment 1-3 and comparative example 1-2
[0054] Procedure for preparing solid catalyst component (A)
[0055] A magnesium chloride and alcohol adduct containing about 3 moles of alcohol was prepared according to the method described in Example 2 of USP 4,399,054, but working at 2000 RPM instead of 10000 RPM. The adduct is heat-treated under a nitrogen stream at a temperature ranging from 50° C. to 150° C. until an alcohol content of 25% by weight is reached.
[0056] Dissolve 1 L of TiCl at 0 °C under a nitrogen purge 4 Introduce into a 2L four-neck round bottom flask. Then, at the same temperature, 70 g of spherical MgCl prepared as described above containing 25% by weight of ethanol was added under stirring. 2 / EtOH adduct. After 2 hours, the temperature was raised to 140° C. and maintained for 120 minutes. Stirring was then stopped, the solid product was allowed to settle and the supernatant was siphoned off. The solid residue was then washed once with heptane at 80°C, five times with hexane at 25°C and dried...
Embodiment 4-6 and comparative example 3-4
[0068] Preparation of solid component (A)
[0069] A magnesium chloride and alcohol adduct containing about 3 moles of alcohol was prepared according to the method described in Example 2 of USP 4,399,054, but working at 2000 RPM instead of 10000 RPM. The adduct was heat-treated under nitrogen flow at a temperature ranging from 50° C. to 150° C. until an alcohol content of 24.4% by weight was reached.
[0070] Dissolve 1 L of TiCl at 0 °C under a nitrogen purge 4 Introduce into a 2L four-neck round bottom flask. Then, at the same temperature, 70 g of spherical MgCl prepared as described above containing 24.4 wt% ethanol was added under stirring 2 / EtOH adduct. After 2 hours, the temperature was raised to 130° C. and maintained for 90 minutes. Stirring was then stopped, the solid product was allowed to settle and the supernatant was siphoned off. Add a new amount of fresh TiCl 4 Add to flask to bring up to initial liquid volume. Hold at 90°C for 30 minutes. Stirring was ...
Embodiment 7-8 and comparative example 5
[0082] The polymerization process was carried out in the same apparatus as described in Example 1, except that the catalyst prepared according to Example 1 of PCT / EP2014 / 061958 was used in combination with tetrahydrofuran as external donor. Atmer 163 is used as antistatic instead of GMS. Polymerization conditions and results are reported in Table 3.
[0083] table 3
[0084]
[0085]
[0086] As demonstrated in the examples above, halohydrins provide reduced ethane per unit of PE produced (C 2 + ) production and increased polymerization activity. In particular, halohydrins (Example 1) proved to be more effective than halohydrocarbons in reducing ethane production under the same conditions (Comparative Examples 1-2).
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