Novel polyethylene elastomer metal ion purification device

Abstract

Belonging to the technical field of chemical production, the invention discloses a novel polyethylene elastomer metal ion purification device, which comprises a raw material refining tower, static mixers connected through pipelines, a shell provided with a teletransmission differential pressure gauge, the inner wall of the shell is fixedly connected with a distributor and a filter cartridge support from top to bottom, and the filter cartridge support is fixedly connected with the shell. A filter cartridge is fixed on the filter cartridge bracket in a penetrating manner and comprises a stainless steel framework and a silk screen, the stainless steel framework is fixed on the filter cartridge bracket, the silk screen is fixedly connected with the stainless steel framework, the bottom of the silk screen is of a closed structure, the silk screen is communicated with the stainless steel framework, the upper part of the stainless steel framework is of an open structure, and the inner wall of the silk screen is coated with an adsorbent. When metal ions in the polyethylene elastomer are efficiently adsorbed, the problem that the polyethylene elastomer cannot be continuously and efficiently treated is solved by switching the destination of the polyethylene elastomer in time, and meanwhile, the problem that the production process is influenced due to the flow change of the upstream polyethylene elastomer is solved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of chemical production, in particular to a novel polyethylene elastomer metal ion purification device. BACKGROUND

[0002] As an important polymer material, polyethylene elastomer is widely used in various fields. In the production process of the polyethylene elastomer, the existence of metal ions will have adverse effects on the application and performance of the product. For example, when the polyethylene elastomer is used for a photovoltaic adhesive film, the volume resistivity of the product is reduced, and the photovoltaic power generation efficiency is reduced; when the polyethylene elastomer is used in the medical and health field, the medical equipment is polluted due to metal residues, and the like. Therefore, an effective metal ion adsorption method is needed to improve the purity of the polyethylene elastomer so as to obtain the purified polyethylene elastomer. The traditional adsorption method has the problems of low adsorption efficiency, complex operation and high cost. In addition, after the metal ions in the polyethylene elastomer are fully adsorbed by the existing technology, the adsorption equipment cannot be processed in time, the pressure in the adsorption equipment is increased, and the circulation of the polyethylene elastomer is affected. SUMMARY

[0003] In order to solve the technical problems mentioned in the background, the application provides a novel polyethylene elastomer metal ion purification device, and the technical scheme is as follows:

[0004] The raw material refining tower is connected with a reactor through a pipeline, the reactor is connected with a devolatilizer through a pipeline, the devolatilizer is connected with a group of static mixers through a pipeline, the static mixers are connected with each other through a pipeline, the static mixer comprises a shell, a remote differential pressure table is arranged on the shell, a distributor and a filter cartridge support are fixedly connected to the inner wall of the shell from top to bottom, a filter cartridge is fixedly penetrated on the filter cartridge support, the filter cartridge comprises a stainless steel framework and a wire mesh, the stainless steel framework is fixed on the filter cartridge support, the wire mesh is fixedly connected with the stainless steel framework, the bottom of the wire mesh is a closed structure, the wire mesh is in communication with the stainless steel framework, the upper part of the stainless steel framework is an open structure, and the inner wall of the wire mesh is coated with an adsorbent.

[0005] Further, the adsorbent can be but is not limited to a metal organic framework material, an ion exchange resin, activated carbon and the like.

[0006] Further, the static mixer is connected with an extrusion granulator through a pipeline.

[0007] Further, the devolatilizer is connected with a solvent recovery device through a pipeline, and the solvent recovery device is connected with the raw material refining tower through a pipeline.

[0008] Further, the filter cartridge support is fixedly connected with a plurality of filter cartridges.

[0009] Further, the inner wall of the shell is fixedly connected with a bottom grid.

[0010] This invention has the following advantages: After the polyethylene elastomer enters the static mixer, it is evenly distributed and flows down through the distributor. After entering each filter cartridge, the metal ions in the polyethylene elastomer are adsorbed by the adsorbent coated on the inner wall of the wire mesh. The clean polyethylene elastomer passes through the pores of the wire mesh into the shell and is then discharged through the shell. As the number of metal ions adsorbed on the wire mesh gradually increases, when the pressure difference inside the wire mesh is detected by the remote pressure gauge to be greater than the set value, the valve at the top of the static mixer automatically closes, while the valve at the top of another static mixer automatically opens, allowing the polyethylene elastomer to enter the other static mixer. This invention has a simple structure. While achieving efficient adsorption of metal ions in the polyethylene elastomer to purify the polyethylene elastomer, it can also avoid the inability to continuously and efficiently process the polyethylene elastomer by timely switching the destination of the polyethylene elastomer. At the same time, it avoids the problem of the production process being affected by changes in the upstream polyethylene elastomer flow rate. Attached Figure Description

[0011] Figure 1 This is a process flow diagram of the present invention;

[0012] Figure 2 This is a structural diagram of the static mixer of the present invention;

[0013] Figure 3 This is a top view of the filter cartridge support of the present invention;

[0014] Figure 4 This is a top view of the bottom grille of the present invention.

[0015] Attached Figures: 1. Raw material refining tower, 2. Reactor, 3. Deviation device, 4. Static mixer, 5. Shell, 6. Remote differential pressure gauge, 7. Distributor, 8. Filter cartridge support, 9. Filter cartridge, 10. Stainless steel frame, 11. Wire mesh, 12. Extrusion granulator, 13. Solvent recovery unit, 14. Bottom grid. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] Please refer to Figures 1-4This invention provides a novel polyethylene elastomer metal ion purification device, comprising a raw material refining tower 1, a reactor 2 connected to the raw material refining tower 1 via pipelines, a devolatilizer 3 connected to the reactor 2 via pipelines, and a set of static mixers 4 connected to the devolatilizer 3 via pipelines. The static mixers 4 are connected to each other via pipelines. Each static mixer 4 includes a shell 5, on which a remote differential pressure gauge 6 is installed. A distributor 7 and a filter cartridge support 8 are fixedly connected from top to bottom to the inner wall of the shell 5. A filter cartridge 9 is fixedly inserted through the filter cartridge support 8. To ensure smooth passage of molten polyethylene elastomer through the static mixer 4, the wire mesh 11 is designed to ensure a pressure drop of ≤0.1 MPa in the filter cartridge 9. The molten polyethylene elastomer enters from the top of the static mixer 4, and after passing through the distributor 7, it is evenly dispersed within the shell 5 before entering the filter cartridge 9, ensuring that the molten polyethylene elastomer can react more fully and uniformly with the adsorbent. The filter cartridge 9 includes a stainless steel frame 10 and a wire mesh 11 for contact adsorption. The stainless steel frame 10 is fixed on the filter cartridge support 8, and the wire mesh 11 is fixedly connected to the stainless steel frame 10. The bottom of the wire mesh 11 is a closed structure, and the wire mesh 11 is connected to the stainless steel frame 10. The upper part of the stainless steel frame 10 is an open structure. The inner wall of the wire mesh 11 is coated with an adsorbent. The adsorbent has high strength, high adsorption capacity and good chemical stability, and can effectively adsorb metal ions in polyethylene elastomer. During the mixing process, the adsorbent comes into contact with the metal ions in the polyethylene elastomer and undergoes adsorption, thereby removing the metal ions. The pipelines on the upper part of the two static mixers 4 are connected in parallel with the pipelines on the devolatilizer 3, and each of the pipelines on the upper part of the two static mixers 4 is connected to a valve. The two valves are electrically connected to the remote pressure gauge 6 to realize signal transmission. The pipelines at the bottom of the two static mixers 4 are connected in parallel with the pipelines on the extrusion granulator 12.

[0018] Adsorbents can be, but are not limited to, metal-organic frameworks (MOFs), ion exchange resins, activated carbon, etc.

[0019] The static mixer 4 is connected to the extrusion granulator 12 via pipeline.

[0020] The devolatilizer 3 is connected to the solvent recovery unit 13 via a pipeline. The solvent recovery unit 13 is connected to the raw material refining tower 1 via a pipeline. Some of the by-products generated in the devolatilizer 3 enter the solvent recovery unit 13 via a pipeline, and then are sent back to the raw material refining tower 1 via a pipeline for further refining.

[0021] Several filter cartridges 9 are fixedly connected to the filter cartridge support 8. The filter cartridges 9 are fixed to the filter cartridge support 8 by bolts to prevent the filter cartridges 9 from moving or falling due to material impact.

[0022] The inner wall of the shell 5 is fixedly connected to a bottom grid 14. The design of the bottom grid 14 can ensure that the molten polyethylene elastomer flows out evenly without causing flow deviation, and can also intercept the filter cartridge 9 or wire mesh 11 that falls due to damage, preventing blockage of the pipeline or damage to the extrusion granulator 12.

[0023] The key performance indicators of the ultra-clean polyethylene elastomer samples prepared in the laboratory according to this invention are compared with those of Dow Chemical's corresponding photovoltaic product brand DOW 8669 as follows:

[0024] Analysis item Experimental sample of the present application DOW 8669 Analysis method Volume resistivity (Ω·cm) 5.62*10 17 ]]> >10 15 ]] GB / T 141 Transmittance (%) (280-380 nm) 86.5 ≥70 GB / T 2410-2021 Transmittance (%) (380-1100 nm) 93.6 ≥90 GB / T 2410-2021 Tensile breaking strength (MPa) 10.5 ＞5.5 GB / T 1040 Breaking elongation (%) 1130 ＞1000 GB / T 1040

[0025] In summary, the clean polyethylene elastomer obtained by this invention has significant advantages over the prior art in terms of volume resistivity, light transmittance, tensile strength at break, and elongation at break.

[0026] Working principle of the invention:

[0027] After the polyethylene elastomer raw material enters the raw material refining tower 1, it is purified by the fixed-bed refining agent in the raw material refining tower 1 to remove impurities such as water and oxygen, so as to meet the reaction requirements of the high-efficiency catalyst and alkyl aluminum activator. After refining, the polyethylene elastomer enters the reactor 2.

[0028] Under specific temperature and pressure conditions, reactor 2 undergoes a polymerization reaction with the help of a highly efficient catalyst to produce the target polyethylene elastomer product. Under high temperature and high pressure conditions, these polymers form a mixed solution with the solvent and enter devolatilizer 3.

[0029] The devolatilizer 3 uses a multi-stage decompression method to separate the solvent from the molten polyethylene elastomer. The gaseous solvent enters the solvent recovery unit 13 for separation and purification, while the molten polyethylene elastomer enters the static mixer 4 and then the distributor 7. The distributor 7 has a rain-spray plate structure, which can evenly disperse the flow of the polyethylene elastomer. The polyethylene elastomer flowing down from the distributor 7 enters each stainless steel skeleton 10 and wire mesh 11 evenly. The metal ions in the polyethylene elastomer are adsorbed by the adsorbent on the inner wall of the wire mesh 11, while the clean polyethylene elastomer enters the shell 5 through the mesh of the wire mesh 11, and then passes through the bottom grid 14, is discharged through the bottom of the shell 5, and enters the extrusion granulator 12 for granulation.

[0030] As the number of metal ions adsorbed on the wire mesh 11 gradually increases, when the pressure difference inside the wire mesh 11 is detected by the remote pressure gauge 6 to be greater than the set value, the valve at the top of the static mixer 4 automatically closes, while the valve at the top of the other static mixer 4 automatically opens, allowing the polyethylene elastomer to enter the other static mixer 4.

[0031] This invention is simple to operate, convenient to use, and suitable for widespread promotion and application. Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A novel polyethylene elastomer metal ion purification device, comprising a raw material refining tower (1), wherein the raw material refining tower (1) is connected to a reactor (2) via a pipeline, and the reactor (2) is connected to a devolatilizer (3) via a pipeline, characterized in that, The devolatilizer (3) is connected to a set of static mixers (4) via pipelines. The static mixers (4) are connected to each other via pipelines. The static mixer (4) includes a shell (5). A remote differential pressure gauge (6) is installed on the shell (5). A distributor (7) and a filter cartridge support (8) are fixedly connected from top to bottom on the inner wall of the shell (5). A filter cartridge (9) is fixedly installed through the filter cartridge support (8). The filter cartridge (9) includes a stainless steel frame (10) and a wire mesh (11). The stainless steel frame (10) is fixed on the filter cartridge support (8). The wire mesh (11) is fixedly connected to the stainless steel frame (10). The bottom of the wire mesh (11) is a closed structure. The wire mesh (11) is connected to the stainless steel frame (10). The upper part of the stainless steel frame (10) is an open structure. The inner wall of the wire mesh (11) is coated with an adsorbent.

2. The novel polyethylene elastomer metal ion purification device according to claim 1, characterized in that, Adsorbents can be, but are not limited to, metal-organic frameworks, ion exchange resins, activated carbon, etc.

3. The novel polyethylene elastomer metal ion purification device according to claim 1, characterized in that, The static mixer (4) is connected to the extrusion granulator (12) via pipeline.

4. The novel polyethylene elastomer metal ion purification device according to claim 1, characterized in that, The devolatilizer (3) is connected to the solvent recovery unit (13) via a pipeline, and the solvent recovery unit (13) is connected to the raw material refining tower (1) via a pipeline.

5. The novel polyethylene elastomer metal ion purification device according to claim 1, characterized in that, Several filter cartridges (9) are fixedly connected to the filter cartridge support.

6. The novel polyethylene elastomer metal ion purification device according to claim 1, characterized in that, The inner wall of the shell (5) is fixedly connected with a bottom grid (14).

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