Fluorine-containing high polymer material rotational flow bed end-capped reactor
By forming a cyclonic inner circulation in the cyclone bed end capping reactor of fluorine-containing polymer materials, and using fluorine-nitrogen mixture to carry out mass transfer reaction with fluorine-containing polymer materials, the problem of insufficient stability of the end capping equipment of solid-phase fluorine-containing polymer materials is solved, and efficient end capping and chemical stability of the material are achieved.
Patent Information
- Application Number
- CN202421688038.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-17
- Publication Date
- 2025-05-13
- Estimated Expiration
- 2034-07-17
AI Technical Summary
At this stage, the solid-phase fluorine-containing polymer end capping equipment has insufficient stability, which is difficult to meet the working conditions of gas-solid fluidized mass transfer reaction, which affects the chemical stability and use range of materials.
A cyclone bed capping reactor of fluorine-containing polymer material is designed. By forming a cyclonic internal circulation from bottom to top in the reaction tower, the mass transfer reaction is carried out with fluorine-nitrogen mixture gas and fluorine-containing polymer material, which increases the distance of the gas-solid reaction and meets the working conditions of the dilute phase fluidized mass transfer reaction.
It realizes effective end capping of free end groups of fluorine-containing polymer materials, improves the chemical stability and use range of materials, and provides equipment technical conditions for improving the quality of fluorine-containing material products.
Smart Images
Figure CN222855383U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a fluorine-containing polymer material cyclone bed end-capping reactor, belonging to the technical field of end-capping reactions. Background Art
[0002] Fluorine-containing polymer materials are important industrial materials and are indispensable strategic raw materials in the fields of chemical industry, machinery, electricity, electronics, aviation, aerospace, new energy, etc.
[0003] Fluorine-containing polymer materials are usually polymerized fluorine-containing monomers (such as TFE single molecules) and tetrafluoroethylene (PTFE). There are also various fluorine-containing polymer materials such as PVDF, PFA, FEP, FKM, etc., which are also polymerized from different fluorine-containing monomers.
[0004] In the long molecular chain of fluorinated polymers, there are usually unstable end groups at the ends of the molecular chains due to factors such as free radical initiation and chain transfer, which affects the chemical stability of material processing and application. For this reason, the end groups need to be stabilized, that is, end-capped with gas element fluorine to improve chemical stability and expand the application range of the material, which has extremely high economic value.
[0005] To perform end-capping reaction on powdered fluorinated polymer materials, it is necessary to establish stable gas-solid reaction conditions. However, at present, the end-capping equipment for solid-phase fluorinated polymer materials is still a shortcoming of the entire industry. Utility Model Content
[0006] The utility model aims to provide a fluorine-containing polymer material cyclone bed capping reactor in view of the problems existing in the prior art.
[0007] The utility model provides a technical solution to solve the above technical problems: a fluorine-containing polymer material cyclone bed capping reactor, including a reaction tower, a fluorine-nitrogen mixed gas cylinder, and an external circulation pipeline;
[0008] The upper section of the reaction tower is provided with a gas outlet and a powder material inlet, the outer wall of the middle section is provided with a heating device, the inner wall of the middle section is provided with a spiral guide plate, the bottom of the middle section is provided with a bottom plate with multiple injection holes, and the lower section is provided with a gas inlet; the bottom plate is provided with a pipe outlet for powder material discharge, which is connected with the middle section and passes through the bottom of the lower section;
[0009] The fluorine-nitrogen mixed gas cylinder is connected to the gas inlet through a pipeline; the upper and lower ends of the external circulation pipeline are respectively connected to the gas outlet and the gas inlet.
[0010] A further technical solution is that an air pump is provided on the external circulation pipeline, and the air pump pushes the fluorine-nitrogen mixed gas to form a swirling internal circulation from bottom to top in the reaction tower, and the swirling shape increases the distance of the gas-solid reaction.
[0011] A further technical solution is that the gas injection device comprises an injection pipe connected to the gas inlet, and the injection pipe is provided with a plurality of injection holes.
[0012] A further technical solution is that a bubble cap covering the injection hole is provided on the bottom plate.
[0013] A further technical solution is that the upper section and the lower section of the reaction tower are respectively provided with a first barometer and a second barometer, and the middle section is provided with a thermometer.
[0014] A further technical solution is that the reaction tower comprises a gas expansion and sedimentation section, a gas-solid reaction section, and a gas-powder bubbling section which are sequentially connected from top to bottom.
[0015] A further technical solution is that the heating device is a jacket, and a heat transfer oil inlet and a heat transfer oil outlet are provided on the jacket.
[0016] The beneficial effects of the utility model are as follows: the utility model forms a swirling internal circulation fluorine-nitrogen mixed gas from bottom to top to carry out mass transfer reaction with the fluorine-containing polymer material in the reaction section, and the swirling shape increases the distance of the gas-solid reaction to meet the working condition of the gas-solid dilute phase fluidized mass transfer reaction, thereby achieving the purpose of capping the free end groups of the fluorine-containing polymer material; thereby providing equipment technical conditions for improving the quality of my country's fluorine material products. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model.
[0018] As shown in the figure: 1-reaction tower; 2-gas outlet; 3-gas inlet; 4-powder material inlet; 5-pipe mouth; 6-air pump; 7-thermometer; 8-second barometer; 9-first barometer; 10-jacket; 11-fluorine-nitrogen mixed gas cylinder; 12-fluorine-containing polymer material; 13-spiral guide plate; 14-bubble cap. DETAILED DESCRIPTION
[0019] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0020] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.
[0021] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0022] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
[0023] like Figure 1 As shown, the fluorine-containing polymer material cyclone bed capping reactor provided by the utility model comprises a reaction tower 1, a fluorine-nitrogen mixed gas cylinder 11, an external circulation pipeline, and an air pump 6 for driving the gas circulation reaction;
[0024] The reaction tower 1 comprises an upper section (gas expansion and settling section), a middle section (gas-solid reaction section), and a lower section (gas-powder bubbling section) which are sequentially connected from top to bottom;
[0025] The top of the upper section (gas expansion and sedimentation section) is provided with a gas outlet 2 and a powder material inlet 4, the outer wall of the middle section (gas-solid reaction section) is provided with a heating device, a spiral guide plate 13 is welded on the inner wall of the middle section (gas-solid reaction section), the bottom of the inner cavity of the middle section (gas-solid reaction section) is provided with a bottom plate with multiple injection holes, and the bottom of the lower section (gas-powder bubbling section) is provided with a gas inlet 3; the bottom plate is provided with a powder material discharge pipe 5, which is connected with the middle section and passes through the bottom of the lower section; the fluorine-nitrogen mixed The combined gas cylinder 11 is connected to the gas inlet 3 through a pipeline, the gas inlet 3 is connected to the lower section inner cavity, and the lower section inner cavity is connected to the middle section inner cavity through the injection hole. Therefore, the gas in the fluorine-nitrogen mixed gas cylinder 11 can directly enter the middle section inner cavity from the injection hole. A bubble cap 14 covering the injection hole is provided at the bottom of the inner cavity of the reaction tower 1. The upper and lower ends of the external circulation pipeline are respectively connected to the gas outlet 2 and the gas inlet 3. The air pump 6 pushes the fluorine-nitrogen mixed gas to form a swirling internal circulation from bottom to top in the reaction tower 1.
[0026] In this embodiment, a spiral guide plate 13 is welded on the inner wall of the middle section (gas-solid reaction section) to produce a spiral guide effect on the airflow, changing "direct current" to "vortex", that is, changing the traditional direct current fluidized bed to a vortex fluidized bed, so as to increase the distance of the fluidized state reaction and improve the efficiency of the capping reaction. On the other hand, the spiral guide plate 13 also expands the area for heating the medium, thereby improving the reaction efficiency.
[0027] The working process of the fluorine-containing polymer material cyclone bed end-capping reactor of the utility model is as follows: the powdered fluorine-containing polymer material 12 enters the bottom plate of the middle section (gas-solid reaction section) of the reaction tower 1 through the powder material inlet 4, and the gas participating in the reaction is proportionally injected into the middle section of the reaction tower 1 by the fluorine-nitrogen mixed gas cylinder 11 and filled; the middle section is heated by the heating device to heat the powder material in the reaction section to reach the reaction temperature. The air pump 6 pushes the fluorine-nitrogen mixed gas to form a cyclone-like internal circulation from bottom to top in the reaction tower 1, and conducts mass transfer reaction with the fluorine-containing polymer material in the middle section (gas-solid reaction section); the air pressure and air volume of the air pump 6 are adjusted to push the gas to overcome the resistance of the bubble cap 14, and push the powder and the mixed gas to rise in a spiral shape in the tower, so as to meet the working conditions of the gas-solid dilute phase fluidized mass transfer reaction, and achieve the purpose of capping the free end group of the fluorine-containing polymer material.
[0028] The end-capping equipment is a single batch intermittent production. The particle size requirement for polymer powder materials is as fine as possible. The reaction conditions are suitable for ultrafine fluorine material dry powder with a particle size of ≤10μm (water content ≤0.02%). The end-capping time is subject to the qualified sampling test. Before discharging, the gas in the tower needs to be replaced with nitrogen, and the exhaust gas needs to be treated with lime water before it can be vented.
[0029] The fluorine-containing mixed gas currently recommended for use with this equipment is commercial bottled gas containing 30% fluorine gas and 70% nitrogen.
[0030] The equipment is currently most suitable for the end-capping treatment of two fluorine-containing polymer materials, PFA and FEP.
[0031] At present, the solid-phase fluorine-containing polymer material end-capping equipment is still a shortcoming of the entire industry. The design of this equipment is the first in the industry to propose the use of fluidized bed reactors for the end-capping reaction of fluorine-containing polymer materials. The equipment can meet the working conditions of gas-solid dilute phase fluidized mass transfer reaction, achieving the purpose of free end-capping of fluorine-containing polymer materials.
[0032] The fluorine-containing gas in the device is harmful gas, so a closed-loop, intermittent reaction process is adopted, that is, the gas in the reaction tower 1 is circulated from bottom to top through an external circulation pipeline to ensure environmental protection and safety requirements.
[0033] In this embodiment, in order to monitor the reaction conditions in the reaction tower 1 in real time, a preferred implementation is that a first barometer 9 and a second barometer 8 are respectively provided at the top and bottom of the reaction tower 1, and a thermometer 7 is provided in the middle.
[0034] In this embodiment, a specific implementation of the heating device is that the heating device is a jacket 10, and the jacket 10 is provided with a heat transfer oil inlet and a heat transfer oil outlet. The middle section (gas-solid reaction section) is heated by injecting heat into the jacket 10.
[0035] The above description does not impose any form of limitation on the present invention. Although the present invention has been disclosed through the above embodiments, it is not used to limit the present invention. Any technician familiar with the profession can make some changes or modify the technical contents disclosed above into equivalent embodiments with equivalent changes without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.
Claims
1. Fluorine-containing polymer material cyclone bed capping reactor, characterized in that: It comprises a reaction tower (1), a fluorine-nitrogen mixed gas cylinder (11), and an external circulation pipeline; The upper section of the reaction tower (1) is provided with a gas outlet (2) and a powder material inlet (4); the outer wall of the middle section is provided with a heating device; the inner wall of the middle section is provided with a spiral guide plate (13); the bottom of the middle section is provided with a bottom plate with a plurality of injection holes; and the lower section is provided with a gas inlet (3); the bottom plate is provided with a pipe opening (5) for discharging the powder material, which is connected with the middle section and passes through the bottom of the lower section; The fluorine-nitrogen mixed gas cylinder (11) is connected to the gas inlet (3) via a pipeline; the upper and lower ends of the external circulation pipeline are respectively connected to the gas outlet (2) and the gas inlet (3).
2. The fluorine-containing polymer material cyclone bed capping reactor according to claim 1, characterized in that: An air pump (6) is provided on the external circulation pipeline, and the air pump (6) pushes the fluorine-nitrogen mixed gas to form a swirling internal circulation from bottom to top in the reaction tower (1), and the swirling shape increases the distance of the gas-solid reaction.
3. The fluorine-containing polymer material cyclone bed capping reactor according to claim 1, characterized in that: The bottom plate is provided with a bubble cap (14) covering the injection hole.
4. The fluorine-containing polymer material cyclone bed capping reactor according to claim 1, characterized in that: The upper section and the lower section of the reaction tower (1) are respectively provided with a first barometer (9) and a second barometer (8), and the middle section is provided with a thermometer (7).
5. The fluorine-containing polymer material cyclone bed capping reactor according to claim 1, characterized in that: The reaction tower (1) comprises a gas expansion and settling section, a gas-solid reaction section, and a gas-powder bubbling section which are sequentially connected from top to bottom.
6. The fluorine-containing polymer material cyclone bed capping reactor according to claim 1, characterized in that: The heating device is a jacket (10), and a heat transfer oil inlet and a heat transfer oil outlet are provided on the jacket (10).