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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.
Juu
Continuous
Maagizo
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.
Vifaa kwa hatua hii:
Propilini1 tZana zinazohitajika:
Riakta ya shinikizo
Kichocheo cha Ziegler-Natta (TiCl4 kwenye MgCl2)
Kibana gesi2
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.
Zana zinazohitajika:
Kibana gesi3
3
Pelletise
Pelletise
Melt the powder in the extruder, with any additives the grade needs, and cut the strand into pellets.
Zana zinazohitajika:
Kitoaji cha plastiki4
4
Pressure units
Pressure units
Inapakia daftari la Jupyter…
Zana Zinazohitajika
4- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
Mchoro huu unatengeneza
Blueprint zinazohusiana
Blueprint hizi zinashiriki maarifa — mbinu, vifaa au kanuni
CC0 Umma Wote
Mchoro huu umetolewa chini ya CC0. Uko huru kunakili, kubadilisha, kusambaza, na kutumia kazi hii kwa madhumuni yoyote, bila kuomba ruhusa.
Saidia Mtengenezaji kwa kununua bidhaa kupitia Mchoro wao ambapo wanapata Kamisheni ya Mtengenezaji iliyowekwa na Wachuuzi, au unda marudio mapya ya Mchoro huu na uiunganishe kama kiungo katika Mchoro wako kuchangia mapato.