Prepylene multistage polymerization technology and polymerization reactor

A multi-stage polymerizing process of propene for preparing the homopolypropene or copolypropene with adjustable and wide molecular weight distribution includes the first-stage reaction; the slurry polymerizing in liquid propene to obtain low-molecular polymer and the second-stage reaction: polymerizing in horizontal reactor to obtain high-molecular polymer. Said horizontal reactor is composed of gasifying separation region, displacing region, isolating region and gas-phase copolymerizing region.