Production method of polypropylene and device thereof

Abstract

The invention discloses a production method of polypropylene with an English name of Polypropylene (short for PP) and a device thereof, belonging to the technical field of polymer synthesis. The production method comprises the steps of: prepolymerization, polymerization-flash vaporization, degasification-steaming, drying-extruding, granulating-product package and the like. By optimizing the technique steps and parameters of prepolymerization, polymerization, flash vaporization, degasification, steaming, drying, extruding, granulating and the like, the invention improves the utilization ratio of raw materials, simultaneously adds a waste gas and waste liquor recovery system creatively, adds a heat recovery system of a washing tower, uses recovered heat for heating grease, and improves heat utilization ratio; the setting of powder and condensate recovery device improves production efficiency and reduces production cost; a standby water tank is added for granulating and water supply, thus preventing machine stopping caused by fault of the water tank and improving production efficiency; and the improvement of gas-exiting pipelines and exhaust pipelines eliminates potential safety hazard, saves cost and has good environment protection.

Description

Technical field [0001] The invention relates to a production method and device of polypropylene (English name: Polypropylene (PP for short)), which belongs to the technical field of polymer synthesis. Background technique [0002] At present, the main production methods of polypropylene include the following: 1. Solvent polymerization process, which has the disadvantages of large investment, high energy consumption, and serious environmental pollution; 2. A combination of kettle liquid phase polymerization and fluidized bed gas phase polymerization. Bulk polymerization method; 3. Gas phase method, using plug flow gas phase reactor; 4. Combined bulk polymerization method using liquid phase loop reactor and dense phase fluidized reactor; 5. Intermittent liquid phase bulk polymerization method . Among the above-mentioned processes, the intermittent liquid-phase bulk polymerization method uses propylene monomer as raw material, adds a trace amount of hydrogen, aluminum triethyl...

AI Technical Summary

Problems solved by technology

[0002] At present, the production methods of polypropylene mainly include the following types: 1. The solvent polymerization process has the disadvantages of large investment, high energy consumption, and serious environmental pollution; 2. The combined method of still-type liquid-phase polymerization and fluidized-bed gas-phase polymerization Bulk polymerization method; 3. Gas phase method, using a plug flow gas phase reactor; 4. A combined bulk polymerization method using a liquid phase loop reactor and a dense phase fluidized reactor; 5. Batch liquid phase bulk polymerization method

Among the above several processes, the batch-type liquid-phase bulk polymerization method uses propylene monomer as raw material, adds trace hydrogen, triethylaluminum and auxiliary catalyst to carry out homopolymerization reaction, and undergoes flash degassing, drying, extrusion The finished product of polypropylene granulated, because the process route is suitable for my country's national conditions, has been widely used at present, but there are still many defects in this process, such as raw materials, steam, and heat energy in the process are not recycled, which often leads to waste. And waste gas, waste water, and waste heat are also very serious to environmental pollution because they cannot be treated.

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