CN211358762U

CN211358762U - Polyethylene low-temperature low-pressure polymerization reaction kettle

Info

Publication number: CN211358762U
Application number: CN201921656641.7U
Authority: CN
Inventors: 相宁; 相锐
Original assignee: XI'AN IAMTECH POLYMER MATERIAL Ltd
Current assignee: XI'AN IAMTECH POLYMER MATERIAL Ltd
Priority date: 2019-09-30
Filing date: 2019-09-30
Publication date: 2020-08-28
Anticipated expiration: 2029-09-30

Abstract

The utility model discloses a polyethylene low-temperature low-pressure polymerization reaction kettle, which comprises a kettle body, an air inlet pipe and a stirring paddle, wherein the stirring paddle is positioned at the lower part in the kettle body, the central axis of the stirring paddle vertically extends upwards, and the stirring paddle rotates to generate downward turbulent flow in the kettle body; the air inlet pipe is located one end in the kettle body extends downwards to the bottom of the kettle body and below the stirring paddle along the inner wall of the kettle body. The utility model discloses simple structure overcomes the insufficient problem of polymerization in-process raw materials mixing under low temperature low pressure environment to promote reaction efficiency, reduce the reaction energy consumption, and promote polyethylene product quality.

Description

Polyethylene low-temperature low-pressure polymerization reaction kettle

Technical Field

The utility model relates to a chemical reactor field, concretely relates to polyethylene low temperature low pressure polymerization cauldron.

Background

Polyethylene (PE) is by far the most widely used polymer material in the world. The synthesis of polyethylene can be classified into a high pressure polymerization process, a medium pressure polymerization process, and a low pressure polymerization process according to the polymerization pressure. The polyethylene reaction kettle is a main device for preparing polyethylene high molecular materials, and two or more liquids and liquids with certain volumes are uniformly mixed with solid or gas materials by a stirrer under certain pressure and temperature to promote the reaction. In a reaction kettle for preparing polyethylene by low-temperature and low-pressure polymerization, due to the difficult problem of insufficient mixing of gas-liquid, gas-solid and liquid-solid raw materials, the polymerization reaction rate is slow, the reaction efficiency is low and the reaction energy consumption is high.

SUMMERY OF THE UTILITY MODEL

To the defect among the prior art, the utility model provides a simple structure has overcome the polyethylene low temperature low pressure polymerization cauldron of the insufficient problem of raw materials mixing in the low temperature low pressure polymerization process, has promoted reaction efficiency, has reduced the reaction energy consumption to polyethylene product quality has been promoted.

The utility model provides an above-mentioned technical problem adopted technical scheme as follows:

a polyethylene low-temperature low-pressure polymerization reaction kettle comprises a kettle body, an air inlet pipe and a stirring paddle, wherein the stirring paddle is positioned at the lower part in the kettle body, the central shaft of the stirring paddle vertically extends upwards, and the stirring paddle rotates to generate downward turbulent flow in the kettle body; the air inlet pipe is located one end in the kettle body extends downwards to the bottom of the kettle body and below the stirring paddle along the inner wall of the kettle body.

The beneficial effects of the utility model are embodied in: simple structure, at internal catalyst and the solvent of putting into of cauldron, utilize ethylene gas to get into the internal bubble of cauldron from the internal bottom of cauldron through the intake pipe, the bubble upwards floats the in-process at the cauldron body and is broken by the stirring rake, and along with the rotatory decurrent turbulent flow that produces of stirring rake and the internal catalyst of cauldron and solvent intensive mixing, overcome the insufficient problem of polymerization in-process raw materials mixing under low temperature low pressure environment, thereby promote reaction efficiency, reduce the reaction energy consumption, and promote polyethylene product quality.

Further, the stirring paddle adopts a propelling stirring paddle.

The beneficial effect of adopting the further technical scheme is that: the push type stirring paddle is used for rotating and crushing ethylene bubbles, and pushing the catalyst and the solvent in the kettle body to generate turbulence downwards, so that the raw materials are fully and uniformly mixed in the kettle body.

Further, the intake pipe is responsible for and many air inlet branch by admitting air and constitutes, air inlet branch's pipe diameter is less than air inlet branch's the pipe diameter of being responsible for, air inlet branch's one end is located the cauldron is external, and the other end is located the cauldron is internal, many air inlet branch's one end is connected air inlet branch is located the internal one end of cauldron, the other end all follow cauldron internal wall downwardly extending extremely cauldron body bottom and the below of stirring rake.

The beneficial effect of adopting the further technical scheme is that: ethylene gas is responsible for the back by many inlet branch and is shunted the back and get into the internal a plurality of tiny bubbles that form of cauldron through the inlet, and tiny bubble is changeed by the stirring rake breakage, and more extensive with the internal catalyst of cauldron and solvent contact mix to more quick realization raw materials misce bene promotes reaction efficiency and product quality.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.

Fig. 1 is a schematic diagram of the internal structure of the embodiment of the present invention;

in the attached drawing, 1-kettle body, 2-stirring paddle, 3-air inlet pipe, 301-main air inlet pipe and 302-branch air inlet pipe.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.

It is to be noted that unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the present invention belongs.

As shown in fig. 1, a polyethylene low-temperature low-pressure polymerization reaction kettle comprises a kettle body 1, an air inlet pipe 3 and a stirring paddle 2;

the stirring paddle 2 is positioned at the lower part in the kettle body 1, the central shaft of the stirring paddle 2 vertically extends upwards, and the stirring paddle 2 adopts a propelling stirring paddle which rotates to generate downward turbulent flow in the kettle body 1;

the one end that intake pipe 3 is located the cauldron body 1 is along the below of 1 inner wall downwardly extending to the cauldron body 1 bottom and stirring rake 2 of the cauldron body, intake pipe 3 is responsible for 301 and many air inlet branch pipe 302 by admitting air to one, the pipe diameter of air inlet branch pipe 302 is less than the pipe diameter of the person in charge 301 that admits air, the one end that 301 was responsible for in the air is located outside the cauldron body 1, the other end is located the cauldron body 1, the one end of many air inlet branch pipe 302 is connected and is admitted air the one end that 301 is located the cauldron body 1, the other end all follows the below of 1 inner wall downwardly extending to the cauldron body 1 bottom and stirring rake 2 of the.

The working mode is as follows: catalyst and solvent are put into the kettle body 1, ethylene gas is distributed through the plurality of air inlet branch pipes 302 after passing through the air inlet main pipe 301, and then enters the kettle body 1 from the bottom in the kettle body 1 to form a plurality of fine bubbles, the bubbles are crushed by the stirring paddle 2 in the upward floating process of the kettle body 1, downward turbulence generated along with the rotation of the stirring paddle 2 is fully mixed with the catalyst and the solvent in the kettle body 1, and the problem of insufficient mixing of raw materials in the polymerization reaction process under the low-temperature and low-pressure environment is solved.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the scope of the embodiments of the present invention, and are intended to be covered by the claims and the specification.

Claims

1. The utility model provides a polyethylene low temperature low pressure polymerization cauldron, includes the cauldron body (1), intake pipe (3) and stirring rake (2), its characterized in that: the stirring paddle (2) is positioned at the lower part in the kettle body (1), the central axis of the stirring paddle vertically extends upwards, and the stirring paddle (2) rotates to generate downward turbulence in the kettle body (1); one end of the air inlet pipe (3) positioned in the kettle body (1) extends downwards to the bottom of the kettle body (1) and below the stirring paddle (2) along the inner wall of the kettle body (1); intake pipe (3) are responsible for (301) and many air inlet branch pipe (302) by one admitting air and constitute, the pipe diameter of air inlet branch pipe (302) is less than the pipe diameter of the person in charge (301) admits air, the one end of the person in charge (301) of admitting air is located outside the cauldron body (1), the other end is located in the cauldron body (1), many the one end of air inlet branch pipe (302) is connected admit air and be responsible for (301) and be located one end in the cauldron body (1), the other end all follows cauldron body (1) inner wall downwardly extending reaches cauldron body (1) bottom and the below of stirring rake (2).

2. The low temperature and low pressure polyethylene polymerization reactor of claim 1, wherein: the stirring paddle (2) adopts a push type stirring paddle.