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ÌMỌ̀-Ẹ̀RỌ
ÀWỌN OHUN WÍWỌ̀
HDPE Pellets: Ethylene Polymerised in a Fluidised Bed
High-density polyethylene is made at low pressure on a Ziegler catalyst (a titanium halide with an aluminium compound). In the gas-phase process, ethylene flows up through a fluidised bed of fine catalyst at 85–100 °C and 20 bar and grows into polymer powder, which is melted and cut into pellets.
The picture: our diagram of the bed reactor and extruder.
Ilọsíwájú
Continuous
Ìlànà
1
1
Polymerise in a fluidised bed
Polymerise in a fluidised bed
Feed fine catalyst into the bed reactor and blow ethylene up through it at 85–100 °C and 20 bar. The polymer grows on the catalyst grains.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Ethylene1 tÀwọn irinṣẹ́ tí a nílò:
Ẹ̀rọ ìhùwàsí fluidised-bed
Èròjà ìyára Ziegler-Natta (TiCl4 lórí MgCl2)
Ẹ̀rọ ìfun gáàsì2
2
Take off the powder
Take off the powder
Draw the polyethylene powder off the bed; compress the unreacted ethylene and send it round again.
Àwọn irinṣẹ́ tí a nílò:
Ẹ̀rọ ìhùwàsí fluidised-bedẸ̀rọ ìfun gáàsì3
3
Pelletise
Pelletise
Melt the powder in the extruder and cut the strand into pellets.
Àwọn irinṣẹ́ tí a nílò:
Ẹ̀rọ ìtújáde ṣíṣu4
4
Ethylene gas per kilogram of polymer
Ethylene gas per kilogram of polymer
Ń ṣí ìwé Jupyter…
Àwọn irinṣẹ́ tó nílò
4Ìtọ́nisọ́nà yìí ń ṣe
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