Process for purifying unreacted propylene in the preparation of polypropylene

摘要

In the purificn. of unreacted C3H6 from the catalytic prodn. of polypropylene (PP) from fresh C3H6 by sepg. unreacted C3H6 from the polymerisation suspension leaving the reactor, the unreacted C3H6 is distilled in a still preceding the reactor, using fresh C3H6 as reflux liq., and purified C3H6 is obtd. as distn. prod..