Polyethylene gas phase polymerization process and system

By adopting the series structure of a small ring tube reactor and a gas-phase polymerization reactor in the polyethylene gas-phase polymerization process, combined with catalyst pre-contact and refining treatment, the reactor electrostatic and catalyst refinement problems are solved, and high-strength and high impact resistance are achieved Production of polyethylene pelletized products.

CN119176897APending Publication Date: 2024-12-24NINGXIA BAOFENG ENERGY GROUP CO LTD
View PDF 0 Cites 0 Cited by

Patent Information

Application Number
CN202411355842.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-09-27
Publication Date
2024-12-24

AI Technical Summary

Technical Problem

In the polyethylene gas-phase polymerization process system, the reactor is prone to static electricity, resulting in agglomeration and crust in the polymerization process, and the catalyst refinement leads to a decrease in production efficiency and product quality.

Method used

Using a small ring tube reactor connected in series and a gas-phase polymerization reactor, the catalyst pre-contact mixing and refining process is used to optimize the contact method between the catalyst and the raw material monomer, reduce the fine powder content, improve particle regularity, and remove heat through gasification. Enter condensed mode to eliminate static electricity.

Benefits of technology

Obtaining high-strength, high impact and high rigidity polyethylene pelletized products, improving production load and product quality, reducing fine powder content and static electricity problems.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN119176897A_ABST
    Figure CN119176897A_ABST
Patent Text Reader

Abstract

The invention relates to the technical field of high polymer material preparation, in particular to a polyethylene gas phase polymerization method and system.The method comprises the steps that triethyl aluminum, tri-n-hexyl aluminum, diethyl aluminum monochloride and a slurry catalyst are conveyed into a pre-contact mixer to be mixed; carrying out isopentane refining treatment on isopentane, and carrying out ethylene refining treatment on ethylene; performing initial polymerization reaction on the first high-purity ethylene and the first mixed catalyst in a small loop reactor to obtain small-particle-size polyethylene particles and a second mixed catalyst; and carrying out refining treatment on the 1-butene / 1-hexene, and carrying out polymerization reaction on the small-particle-size polyethylene particles and the 1-butene / 1-hexene in a gas-phase polymerization reactor by taking hydrogen as a molecular weight regulator under the action of a second mixed catalyst to obtain the target polyethylene resin. According to the method provided by the invention, based on the small loop reactor and the gas-phase polymerization reactor which are sequentially connected in series, a polyethylene pelletizing product with high strength, high impact resistance and high rigidity can be obtained.
Need to check novelty before this filing date? Find Prior Art