Loop Reactor Polypropylene Process (ST-PP)

1. Two cascaded loop reactors are used to produce homopolymer and random copolymer. Two loop reactors combined with a gas phase reactor are used to produce impact copolymer.
2. Intermediate Powder Silos will benefit the Polymerization unit operation and grade transition.
3. Pure or pre-blend additives feeding system makes grade transition easier and faster.
4. Loop reactor has its unique benefits:
- High (time and volume) production rate (>400 kg PP/h m3);
- High speed of materials circulation, high polymer concentration in slurry, and high efficiency heat transfer between liquid monomer and polymer powder;
- Uniformed distribution of catalyst system, condensed monomer easily recovered;
- Rapid product grade transition, off-spec product minimized;
- Full liquid reactors;
- Small diameter of reactors, and thin wall even with high design pressure.