Preparation device and method for propylene terpolyme

A preparation device for propylene terpolymer, wherein the preparation device comprises:

• a catalyst pre-filming unit, a polymerization unit, a degassing and deactivation unit, a powder drying unit, a recovery unit, a propylene feeding pipe, an ethylene feeding pipe, a butene feeding pipe, a catalyst feeding pipe, and a polypropylene discharging pipe, wherein,
• the catalyst pre-filming unit comprises a catalyst stirring tank;
• the upper portion of the catalyst stirring tank is connected to the propylene feeding pipe and the catalyst feeding pipe, the bottom portion of the catalyst stirring tank is connected respectively to the top portion of the catalyst stirring tank and the first vertical gas-phase reactor;
• the polymerization unit comprises a first vertical gas-phase reactor, a first reaction cyclone bag filter, a propylene vaporizer tower, a second horizontal gas-phase reactor, a second reaction cyclone bag filter, and a propylene separation tower;
• the first vertical gas-phase reactor, the first reaction cyclone bag filter, and the propylene vaporizer tower are connected in sequence, the top portion of the first vertical gas-phase reactor is connected respectively to the top portion of the second horizontal gas-phase reactor and the bottom portion of the first reaction cyclone bag filter, the top portion of the propylene vaporizer tower is connected respectively to the top portion and the bottom portion of the first vertical gas-phase reactor, and the bottom portion of the propylene vaporizer tower is connected to the lower portion of the first vertical gas-phase reactor;
• the second horizontal gas-phase reactor, the second reaction cyclone bag filter, and the propylene separation tower are connected in sequence, and the top portion of the second horizontal gas-phase reactor is connected to the bottom portion of the second reaction cyclone bag filter;
• the top portion of the propylene separation tower is connected respectively to the top portion and the bottom portion of the second horizontal gas-phase reactor, and the bottom portion of the propylene separation tower is connected to the top portion of the second horizontal gas-phase reactor;
• the degassing and deactivation unit comprises a low-pressure bag filter, a steam treater, and a monomer compression recovery unit, the top portion of the low-pressure bag filter is connected to the monomer compression recovery unit, the upper portion of the low-pressure bag filter is connected to the second horizontal gas-phase reactor, and the bottom portion of the low-pressure bag filter is connected to the top portion of the steam treater, the monomer compression recovery unit is connected to the propylene vaporizer tower and/or the propylene separation tower;
• the powder drying unit comprises a dryer, a drying cyclone separator, and a fines bag filter connected in sequence, the top portion of the dryer is connected to the bottom portion of the steam treater, and the bottom portion of the fines bag filter is connected to the polypropylene discharging pipe;
• the recovery unit is used to recover hydrocarbons from the gaseous and/or liquid discharges of various units, the recovery unit comprises a water wash tower, a propylene recovery line is provided at the top portion of the water wash tower, the middle portion of the water wash tower is connected to at least one of the polymerization unit, the degassing and deactivation unit, and the powder drying unit, and the bottom portion of the water wash tower is connected to downstream device;
• the propylene feeding pipe is connected to the first vertical gas-phase reactor, the propylene vaporizer tower, and the propylene separation tower;
• the ethylene feeding pipe is connected to the propylene vaporizer tower and the propylene separation tower;
• the butene feeding pipe is connected to the propylene separation tower;
• the preparation device further comprises a powder mixing and conveying unit;
• the powder mixing and conveying unit comprises an additive feeding unit, and an additive buffer hopper, a mixer, a powder buffer hopper, and a metal detector connected in sequence;
• the powder mixing and conveying unit comprises at least two sets of the additive feeding units provided in parallel;
• the additive feeding unit comprises a bag-breaking station and an additive loss-in-weight feeder connected in sequence, and the additive loss-in-weight feeder is connected to the additive buffer hopper;
• the dryer is connected to the mixer;
• the metal detector is connected to the polypropylene discharging pipe.