Abstract:
The basic catalyst, dry TiC 13, 1/3 A1C13 is blended and milled with
triphenylphosphine oxide (10:1.67 molar ratio) to form a fixed particle
size. Fresh and recycle propylene plus catalyst is fed to the first of the
polymer t sat ion reactors. These contain a bed of powdered polypropylene,
kept in a fluidised state by vapourised propylene feed. Conditions for the
reaction are 26.5 bar and 70oC. The final step is the pellet
manufacture. The crude polypropylene is separated from unreacted propylene
then introduced into the extruder. Product polypropylene leaves the
extruder and is pelletised and conveyed to the storage section. Unlike the
liquid phase process, the solvents are not recovered or recycled.
