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System and process for enhancing propylene polymerization

A technology for propylene polymerization and propylene, which is applied in the field of propylene polymerization to prepare polypropylene production technology, can solve problems such as low system reaction efficiency, and achieve the effects of ensuring reaction rate, saving energy and saving costs

Active Publication Date: 2021-03-16
NANJING YANCHANG REACTION TECH RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Therefore, the present invention provides a system and process for strengthening propylene polymerization to overcome the system reaction caused by the uneven mixing of materials in the prior art and the generation of by-products The problem of inefficiency

Method used

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  • System and process for enhancing propylene polymerization

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0107] Polypropylene is prepared by polymerizing propylene using the above system and process, wherein:

[0108] In the process, the reaction temperature in the polymerization reactor is 168°C;

[0109] The reaction pressure is 0.2MPa;

[0110] The gas-liquid ratio in the first micro-interface generator is 800:1;

[0111] The gas-liquid ratio in the first micro-interface generator is 650:1.

[0112] After testing, after using the system and process, the product quality: homopolymerization and copolymerization; isotacticity: 96.9wt%; the synthesis efficiency of the process is increased by 2.4%.

Embodiment 2

[0114] Polypropylene is prepared by polymerizing propylene using the above system and process, wherein:

[0115] In the process, the reaction temperature in the polymerization reactor is 170°C;

[0116] The reaction pressure is 0.3MPa;

[0117] The gas-liquid ratio in the first micro-interface generator is 830:1;

[0118] The gas-liquid ratio in the first micro-interface generator is 670:1.

[0119] After testing, after using the system and process, the product quality: homopolymerization and copolymerization; isotacticity: 97.1wt%; the synthesis efficiency of the process is increased by 2.4%.

Embodiment 3

[0121] Polypropylene is prepared by polymerizing propylene using the above system and process, wherein:

[0122] In the process, the reaction temperature in the polymerization reactor is 172°C;

[0123] The reaction pressure is 0.4MPa;

[0124] The gas-liquid ratio in the first micro-interface generator is 870:1;

[0125] The gas-liquid ratio in the first micro-interface generator is 690:1.

[0126] After testing, after using the system and process, the product quality: homopolymerization and copolymerization; isotacticity: 97.0wt%; the synthesis efficiency of the process is increased by 2.3%.

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Abstract

The invention relates to a system and process for strengthening propylene polymerization. The system comprises a polymerization reactor, a gas-phase feeding unit, a liquid-phase feeding unit, a polymerization molecular weight adjusting unit, a reflux unit, a cooling unit and micro-interface generators. Propylene is crushed to form micron-sized bubbles, and the micron-sized bubbles are mixed with asolvent to form a gas-liquid emulsion, so that the phase interface area of a gas phase and a liquid phase is increased, the synthesis efficiency of polypropylene is improved, the reaction efficiencyof propylene is improved, and the cost is saved. Through a first heat exchanger, a second heat exchanger and a third heat exchanger, raw materials and generated materials are subjected to heat exchange, energy is saved, through combined use of a first micro-interface generator and s second micro-interface generator, the retention time of the micron-sized bubbles in a reaction area is prolonged, gas and liquid phases are subjected to a secondary reaction, the propylene utilization rate is increased, the reaction efficiency is improved, the production cost of polypropylene is reduced, and the requirements of existing circular economy are met.

Description

technical field [0001] The invention relates to the technical field of polypropylene production technology prepared by propylene polymerization, in particular to a system and technology for strengthening propylene polymerization. Background technique [0002] Polypropylene is a thermoplastic synthetic resin with excellent performance. Polypropylene has low density, no toxicity, strong processability, and strong impact resistance. In addition, its strong anti-shock ability and good insulation make it widely used. In injection molding products, pipe making, blown film products, coating, wire drawing products, modified engineering plastics and other industrial and civil plastic products. Because of its perfect combination of thermal and mechanical properties, plus its low price advantage, it is one of the four general-purpose thermoplastic resins (polyethylene, polyvinyl chloride, polypropylene, polystyrene). With the rapid development of China's economy, the rapid development...

Claims

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Application Information

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IPC IPC(8): B01J8/00C08F10/06C08F2/01
CPCB01J8/00C08F10/06C08F2/01Y02P20/10
Inventor 张志炳李磊周政张锋孟为民王宝荣杨高东罗华勋杨国强田洪舟曹宇
Owner NANJING YANCHANG REACTION TECH RES INST CO LTD