Unlock instant, AI-driven research and patent intelligence for your innovation.

Vertical stirring reactor for olefin polymerization, and method for producing polyolefin

An olefin polymerization and reactor technology, applied in the field of olefin polymerization, can solve problems such as short circuits, and achieve the effect of preventing hot spots and reducing fine powder content

Active Publication Date: 2021-10-26
CHINA ENERGY GRP NINGXIA COAL IND CO LTD +1
View PDF12 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the defect that the catalyst cannot be dispersed and the catalyst can not be dispersed, and then there will be a short circuit phenomenon, and to provide a vertical stirring reactor for olefin polymerization and a method for producing polyolefin. In the production of polyolefins, the type stirred reactor can not only ensure the rapid dispersion of the catalyst after feeding, avoid sudden polymerization, but also avoid short circuit

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Vertical stirring reactor for olefin polymerization, and method for producing polyolefin
  • Vertical stirring reactor for olefin polymerization, and method for producing polyolefin
  • Vertical stirring reactor for olefin polymerization, and method for producing polyolefin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0035] According to a preferred embodiment of the present invention, the ribbon stirrer 3 is a single ribbon stirrer. In this preferred solution, the single-ribbon agitator is only supported at the bottom, without shafts and spokes, which makes it easier for the catalyst feed pipe 4 to extend into the interior of the housing 1, and is convenient for installation and operation.

[0036] According to a preferred embodiment of the present invention, the distributor 2 is a gas distributor, and the gas distributor is provided with a cone 201 for distributing the gas around. Under this preferred scheme, the catalyst powder can be evenly distributed to the surroundings better without accumulation, and at the same time, the falling material is bent and scooped up again. In this process, vigorous mixing occurs, and the catalyst can be evenly dispersed immediately. .

[0037] In the above embodiments, it can be understood that the cone 201 is provided with through holes for dispersing ...

Embodiment 1

[0048] In a volume of 75m 3 Propylene polymerization is carried out in industrial vertical stirred reactors, such as figure 1 As shown, the height is 8m, the inner diameter is 4m, the material holding capacity of the reactor is 30t during stable operation, and the mass flow rate of olefin feed and polymer discharge is both 25t / h, so the average residence time is 1.2h. Catalyst feeding pipe 4 is 1, and the vertical distance between the position of its feeding port 401 and the bottom of housing 1 is 1m, and the shortest horizontal distance of catalyst feeding pipe 4 from the wall of housing 1 is 1.5m, and feeding port The vertical distance between 401 and distributor 2 (a gas distributor) is 0.3m. The vertical distance from the discharge port 501 of the product discharge pipe 5 to the bottom of the housing 1 is 3 m, and the shortest horizontal distance from the wall of the housing 1 is 1.2 m. A single-ribbon agitator 3 is adopted, and the ribbon is distributed in the housing 1...

Embodiment 2

[0059] Propylene polymerization was carried out in a reactor similar to Example 1, except that the vertical distance between the feed inlet 401 and the distributor 2 was 0.8 m. The residence time distribution of the reactor and figure 2 Similarly, for the fully mixed flow distribution.

[0060] The yield of the obtained polypropylene was 90%.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to the field of olefin polymerization, and concretely relates to a vertical stirring reactor for olefin polymerization, and a method for producing polyolefin. The vertical stirring reactor comprises a shell, a distributor, a helical ribbon stirrer, a catalyst feeding pipe and a product discharging pipe; the distributor is located at the bottom of the shell, the helical ribbon stirrer is located in the shell, and the catalyst feeding pipe and the product discharging pipe extend into the shell from the top of the shell; and the catalyst feeding pipe is provided with a feeding port, the product discharging pipe is provided with a discharging port, and the feeding port is located below the discharging port and located above the distributor at the same time. According to the invention, after the catalyst is injected into the stirring reactor, the catalyst is immediately dispersed into the whole-bed polymer powder by the distributor, short circuit and implosion are avoided, hot spots are prevented from being generated, and the content of fine powder in the obtained product is reduced.

Description

technical field [0001] The invention relates to the field of olefin polymerization, in particular to a vertical stirring reactor for olefin polymerization and a method for producing polyolefin. Background technique [0002] Vertical gas-phase stirred reactors have been used for many years in the field of industrial polyolefin production, using Ziegler-Natta catalysts or metallocene catalysts. Ziegler-Natta catalysts or metallocene catalysts have high polymerization activity, especially in the initial stage of catalyst injection into the reactor. If the catalyst is not dispersed immediately, violent polymerization is prone to occur, resulting in: [0003] 1. The catalyst particles are broken, and the fine powder in the product increases; [0004] 2. Part of the active center is permanently deactivated due to excessive temperature inside the catalyst; [0005] 3. The temperature is not uniform, and hot spots are generated locally. [0006] At present, the catalyst is inject...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): B01J19/20C08F10/00C08F110/06C08F2/01B01J4/00
CPCB01J19/20C08F10/00C08F110/06B01J4/001C08F2/01Y02P20/52
Inventor 李彦鹏王伟孟岩杨进福王健冯国君孙婧元叶天洲王靖岱黄正梁杨遥任聪静阳永荣
Owner CHINA ENERGY GRP NINGXIA COAL IND CO LTD