UBUHANZI
UBWIZA N'UBUZIMA
UBUKORIKORI
UMUCO N'AMATEKA
IMYIDAGADURO
IBIDUKIKIJE
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UBWUBATSI BUSUBIRA INYUMA
UBUMENYI
SIPORO
IKORANABUHANGA
IBYAMBARWA
Polypropylene Pellets by Bulk Polymerisation in Liquid Propylene
Polypropylene is propylene strung into long chains. In the bulk process the propylene itself is the liquid: kept liquid at 30–40 atm, it polymerises at 60–80 °C on a catalyst of titanium tetrachloride on magnesium chloride. Letting the pressure down boils off the unreacted propylene and leaves a powder, which is extruded into pellets. Natta found the regular (isotactic) form in 1954.
The picture: our diagram of reactor, flash and pelletiser.
Hejuru
Continuous
Amabwiriza
1
1
Polymerise in liquid propylene
Polymerise in liquid propylene
Feed propylene and the TiCl4-on-MgCl2 catalyst into the reactor. Hold it at 30–40 atm so the propylene stays liquid, at 60–80 °C.
Ibikoresho by'iyi ntambwe:
Propilene1 tIbikoresho bikenewe:
Reyakitori y'igitutu
Igitera-vuba cya Ziegler-Natta (TiCl4 kuri MgCl2)
Igikandamiza gazi2
2
Let the pressure down
Let the pressure down
Release the pressure: the unreacted propylene boils off and the polymer is left as a fine powder. Compress the propylene and return it.
Ibikoresho bikenewe:
Igikandamiza gazi3
3
Pelletise
Pelletise
Melt the powder in the extruder, with any additives the grade needs, and cut the strand into pellets.
Ibikoresho bikenewe:
Imashini isohora pulasitiki4
4
Pressure units
Pressure units
Gupakira ikaye ya Jupyter…
Ibikoresho bikenewe
4- Umwanya
- Umwanya
- Umwanya
Iki gishushanyo gikora
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Izi blueprint zisangira ubumenyi — uburyo, ibikoresho cyangwa amahame
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