Method for preparing polypropylene through propylene liquid-phase bulk polymerization and application thereof, system for preparing polypropylene through propylene liquid-phase bulk polymerization and application thereof

The invention belongs to the technical field of propylene liquid-phase bulk polymerization, and particularly relates to a method for preparing polypropylene by propylene liquid-phase bulk polymerization and application thereof, and a system for preparing polypropylene by propylene liquid-phase bulk polymerization and application thereof. The method comprises the following steps: (1) heating optional hydrogen and liquid-phase propylene with the molar weight of n1 to T1 DEG C to obtain a preheated material; (2) adding a catalyst into the preheated material, and carrying out polymerization reaction at T2 DEG C to obtain a polypropylene product; wherein the liquid-phase propylene supplementary material is supplemented in the step (2), so that the polymerization reaction is at a constant pressure P1; the pressure P1 is greater than the saturated vapor pressure of propylene at the highest temperature in the polymerization reaction process. The method and the system disclosed by the invention can be operated in a co