A production line for producing chlorinated polyethylene

Abstract

The invention belongs to the technical field of chemical equipment, and specifically is a production line for producing chlorinated polyethylene, comprising a reaction kettle, a deacidification kettle, a neutralization kettle, a dealkalization kettle, a centrifuge and a drying bed connected in sequence; a multi-purpose kettle is used in the production line to replace the neutralization kettle and the dealkalization kettle, and the neutralization and dealkalization processes of the production line are carried out in the same multi-purpose kettle in sequence during production; the neutralization kettle and the dealkalization kettle are multi-purpose kettles with alkali-resistant treatment on the inner surface, and the deacidification kettle is multi-purpose kettle with acid-resistant treatment on the inner surface; the invention can improve the reaction kettle on the production line, so that the neutralization and dealkalization steps can be carried out in the same reaction kettle in sequence, the number of equipment used is reduced, the equipment floor space and maintenance cost are reduced, and the material transfer time is shortened. At the same time, the improved reaction kettle can prevent the material from sinking to the bottom, promote the uniform mixing of the material, accelerate the speed of neutralization and dealkalization, and improve the production efficiency of the production line.

Description

Technical Field

[0001] The invention belongs to the technical field of chemical equipment, in particular to a production line for producing chlorinated polyethylene. Background Art

[0002] Chlorinated polyethylene, chemical name CPE, is a saturated polymer material with excellent stability, weather resistance, ozone resistance, chemical resistance and aging resistance. It is widely used in plastics, rubber, building materials, electromechanical, automobile, military and other fields.

[0003] At present, the production processes of chlorinated polyethylene (CPE) include water phase suspension method, acid phase suspension method, solid phase method, and solution method. Among them, water phase suspension method and acid phase suspension method are widely used. However, due to the high equipment investment cost of the acid phase suspension method, more manufacturers are willing to use the water phase suspension method. The water phase suspension method commonly used in China mainly includes chlorination, deacidification, neutralization, dealkalization, centrifugal separation, drying, crushing and mixed packaging.

[0004] In the process of preparing chlorinated polyethylene by aqueous suspension method, polyethylene powder is usually suspended in water or hydrochloric acid medium, chlorine gas is introduced in the presence of organic peroxide initiator or ultraviolet light, and then deacidification, neutralization, water washing, centrifugation, drying and other processes are carried out to finally obtain the chlorinated polyethylene product; this method produces chlorinated polyethylene with stable product quality, low raw material consumption and relatively small equipment investment, but a large amount of low-concentration hydrochloric acid is generated during the chlorination reaction, which has a heavy processing burden and needs to be removed in three steps of deacidification, neutralization and dealkalization in sequence, and this step usually needs to be carried out in three different reactors (deacidification reactor, neutralization reactor and dealkalization reactor).

[0005] Among them, the deacidification process of the deacidification kettle is to remove the acidic substances on the surface of the material by water washing. Since the material contains a large amount of low-concentration hydrochloric acid, and the deacidification process does not require heating, the equipment is generally required to be resistant to acid corrosion and no high temperature resistance is required; the neutralization process of the neutralization kettle is to neutralize the acidic substances inside the material by adding alkali and raising the temperature, so the equipment needs to be resistant to alkali and high temperature. At present, fiberglass is usually used. After the neutralization reaction is completed, the material is usually directly pressed to the de-alkali kettle through the discharge port, so the neutralization kettle is usually not equipped with a filter head; the de-alkali process of the de-alkali kettle is also carried out by water washing. Since the material pressed from the neutralization kettle contains a large amount of alkali, the de-alkali process does not require heating, so the de-alkali kettle requires alkali resistance and no high temperature resistance.

[0006] At the same time, different equipment is used to carry out deacidification, neutralization and dealkalization in sequence. Although this method does not have high requirements for each equipment, it uses a lot of equipment, increases the production floor space and equipment maintenance costs, and increases material transfer time, prolongs the entire chlorinated polyethylene production cycle, and reduces production efficiency;

[0007] At the same time, in the process of deacidification, neutralization and dealkalization, in order to improve the processing efficiency, it is necessary to stir the materials in the reactor to promote mixing and flushing between the materials. However, the stirring mechanism in the existing reactor is fixed in position, which easily causes the materials to sink to the bottom of the reactor, affecting the stirring uniformity between the materials and the alkali solution and water, resulting in poor deacidification, neutralization and dealkalization effects and low efficiency, which will also affect the production efficiency of the production line and the quality of the products obtained. Summary of the invention

[0008] In order to make up for the shortcomings of the prior art, the reactor on the production line is improved so that the neutralization and dealkalization steps can be carried out in the same reactor in sequence, thereby reducing the number of equipment used, reducing the equipment footprint and maintenance costs, shortening the material transfer time, and improving the production efficiency of the production line for products. At the same time, the improved reactor can prevent the material from sinking to the bottom, promote uniform mixing between the material and water and alkali solution, accelerate the speed of neutralization and dealkalization, and further improve the production efficiency of the production line. The present invention proposes a production line for producing chlorinated polyethylene.

[0009] The technical solution adopted by the present invention to solve the technical problem is as follows: the production line for producing chlorinated polyethylene comprises a reactor, a deacidification reactor, a neutralization reactor, a dealkalization reactor, a centrifuge and a drying bed which are connected in sequence, the reactor is used for chlorination reaction, the deacidification reactor is used for deacidification of chlorinated materials, the neutralization reactor is used for neutralization of hydrochloric acid in the materials, the dealkalization reactor is used for removing alkali solution used in the neutralization process, the centrifuge is used for separation of materials and water, the drying bed is used for drying CPE materials, and the low-concentration hydrochloric acid wastewater generated by the deacidification reactor is sent to a storage tank for storage;

[0010] A multi-purpose kettle is used in the production line to replace the neutralization kettle and the dealkalization kettle. The neutralization and dealkalization processes in the production line are carried out in the same multi-purpose kettle in sequence. The neutralization kettle and the dealkalization kettle are multi-purpose kettles with alkali-resistant internal surfaces, and the deacidification kettle is a multi-purpose kettle with acid-resistant internal surfaces.

[0011] Preferably, the pipeline for conveying CPE materials on the production line is set to a negative pressure, and the negative pressure in the pipeline promotes the movement of CPE materials to the next level of equipment;

[0012] The pipeline is installed with a crushing valve, which acts as a filter and crushes the agglomerated CPE materials in the pipeline.

[0013] Preferably, the waste gas sucked out of the pipeline under the action of negative pressure is sent to a waste gas treatment device for centralized treatment.

[0014] Preferably, the multi-purpose kettle comprises a kettle body, a feed port and a discharge port are installed on the kettle body, a motor is installed on the kettle body, a rotating shaft is installed in the kettle body, the motor drives the rotating shaft to move, a guide cylinder is installed at the lower end of the rotating shaft through a connecting rod, the lower end of the guide cylinder is in contact with the bottom surface of the kettle body, a stirring blade is installed on the guide cylinder, a paddle is installed at the lower end of the guide cylinder, and the paddle stirs the material near the bottom surface of the kettle body;

[0015] A spiral plate is installed on the inner wall of the guide cylinder, and a notch is opened at the lower end of the guide cylinder.

[0016] Preferably, a dispersion disk is installed at the lower end of the rotating shaft, and the connecting rod installs the guide cylinder below the dispersion disk;

[0017] The dispersion disk comprises an upper plate and a lower plate, a plurality of groups of arc-shaped blades are installed between the upper plate and the lower plate, a through hole is opened in the middle of the lower plate, the through hole is aligned with the opening at the upper end of the guide cylinder, and a gap exists between the lower plate and the guide cylinder.

[0018] Preferably, a guide plate is installed at the edge of the lower plate, the cross section of the guide plate is an arc-shaped upward, and evenly distributed protrusions are arranged on the edge of the guide plate.

[0019] Preferably, the upper and lower ends of the guide cylinder are both installed with fixing plates, and the two ends of the connecting rod are respectively installed on the lower plate and the fixing plate;

[0020] A mounting ring is slidably mounted on the guide cylinder, the stirring blade is mounted on the mounting ring through a support rod, and a spring is installed between the mounting ring and the fixing plate;

[0021] The mounting ring and the guide cylinder are connected via a spline.

[0022] Preferably, a positioning shaft is installed on the bottom surface of the kettle body, the positioning shaft passes through the middle of the spiral plate in the guide cylinder, the positioning shaft and the spiral plate are in contact with each other, and the upper end of the positioning shaft and the lower end of the rotating shaft are rotatably connected to each other.

[0023] The beneficial effects of the present invention are as follows:

[0024] 1. The production line for producing chlorinated polyethylene described in the present invention uses a multi-purpose kettle to replace the neutralization kettle and the dealkalization kettle, so that the neutralization and dealkalization process steps can be carried out in sequence in the same multi-purpose kettle, without increasing the requirements for equipment too much, thereby ensuring the cost-effectiveness of the equipment, reducing the transfer time of materials between equipment, shortening the overall production time of the product, and improving the production efficiency of the production line. At the same time, it can also reduce the occupied area of ​​the equipment in the production line and reduce the subsequent maintenance cost.

[0025] 2. The production line for producing chlorinated polyethylene described in the present invention, by arranging guide cylinders, spiral plates, dispersion discs, mounting rings, stirring blades and springs, can transfer materials that sink downwards and settle to the bottom of the kettle body to the upper part of the kettle body, and fully disperse and mix the materials transferred to the upper part, thereby improving the mixing uniformity of the materials and the liquid in the kettle body, and improving the effect and speed of neutralization and dealkalization. At the same time, the stirring blades can move up and down to stir the materials at different positions in the kettle body, further improving the mixing uniformity of the materials and the liquid in the kettle body, improving the effect and efficiency of neutralization and dealkalization, and preventing the materials in the kettle body from sinking downwards and settling to the bottom, thereby affecting the production efficiency of the production line. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described below in conjunction with the accompanying drawings.

[0027] Figure 1 It is a schematic diagram of the connection relationship of the production line of the present invention;

[0028] Figure 2 It is a front view of the multi-purpose kettle in the production line of the present invention;

[0029] Figure 3 It is a structural schematic diagram of a multi-purpose kettle in the production line of the present invention;

[0030] Figure 4 It is a cross-sectional view of the guide cylinder and the dispersion disk in the multi-purpose kettle in the production line of the present invention;

[0031] Figure 5 It is a structural schematic diagram of a multi-purpose guide cylinder in a kettle in the production line of the present invention;

[0032] Figure 6 It is a schematic diagram of the structure of the multi-purpose dispersing plate in the kettle in the production line of the present invention;

[0033] Figure 7 yes Figure 4 A partial enlarged view of the middle part;

[0034] Figure 8 yes Figure 4 A partial enlarged view of point B in the middle;

[0035] In the figure: storage tank 1, reaction kettle 11, deacidification kettle 12, multi-purpose kettle 13, filter 14, centrifuge 15, drying bed 16, kettle body 2, motor 21, rotating shaft 22, positioning shaft 23, connecting rod 24, guide cylinder 3, spiral plate 31, dial plate 32, fixed plate 33, notch 34, dispersion disk 4, upper plate 41, lower plate 42, blade 421, through hole 422, guide plate 423, protrusion 424, stirring blade 5, mounting ring 51, spring 52. DETAILED DESCRIPTION

[0036] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0037] like Figures 1 to 8 As shown, the production line for producing chlorinated polyethylene of the present invention comprises a reactor 11, a deacidification reactor 12, a neutralization reactor, a dealkalization reactor, a centrifuge 15 and a drying bed 16 connected in sequence, wherein the reactor 11 is used for chlorination reaction, the deacidification reactor 12 is used for deacidification of chlorinated materials, the neutralization reactor is used for neutralization of hydrochloric acid in the materials, the dealkalization reactor is used for removing alkali solution used in the neutralization process, the centrifuge 15 is used for separation of materials and water, the drying bed 16 is used for drying CPE materials, and the low-concentration hydrochloric acid wastewater produced by the deacidification reactor 12 is sent to the storage tank 1 for storage;

[0038] The multi-purpose kettle 13 is used in the production line to replace the neutralization kettle and the de-alkali kettle. The neutralization and de-alkali processes of the production line are carried out in the same multi-purpose kettle 13 in sequence. The neutralization kettle and the de-alkali kettle are served by the multi-purpose kettle 13 with the inner surface treated with alkali resistance, and the deacidification kettle 12 is served by the multi-purpose kettle 13 with the inner surface treated with acid resistance.

[0039] During production, clean water is added to the reactor 11, and then the high-density polyethylene special material and the additive are added to the reactor 11, and then the reactor 11 is heated. After the temperature is raised to the reaction temperature, chlorine gas is introduced into the reactor 11 for reaction. After the reaction is completed, the reactor 11 is insulated and cooled. After that, the chlorinated material in the reactor 11 is transferred to the deacidification reactor 12 through the pipelines between the various devices, and the chlorinated material is rinsed with clean water to remove the hydrochloric acid contained in the material. After that, the material is transferred to the neutralization reactor, the temperature is raised and alkali is added to neutralize the hydrochloric acid inside the material. After that, the material is transferred to the dealkali reactor, and the material is rinsed with clean water again to remove the alkali solution contained in the material. After that, the material is treated by a centrifuge 15 to separate the material and the water from each other to obtain a wet material. After that, the material is transferred to the drying bed 16 to dry the material. After the material is dried, an isolation agent is added to the material, and after the material and the isolation agent are evenly mixed, it is packaged to obtain a finished CPE product;

[0040] In the production process, the deacidification, neutralization and dealkalization steps are usually carried out using three different equipment, thereby reducing the equipment requirements, but increasing the equipment footprint and maintenance costs, and transferring materials between different equipment will also increase the material transfer time, extend the overall production time of the product, and reduce the production efficiency of the production line. At the same time, the deacidification kettle 12, the neutralization kettle and the dealkalization kettle all need to stir the materials to promote the mixing of the materials with the clean water, alkali solution and clean water, thereby increasing the reaction speed of the materials. The materials in the deacidification kettle 12 contain hydrochloric acid, which requires the deacidification kettle 12 to have good acid resistance, and the materials in the neutralization kettle and the dealkalization kettle both contain alkali, which requires the neutralization kettle and the dealkalization kettle to have good acid resistance. Good alkalinity, therefore, the two process steps of neutralization and dealkalization have completely opposite requirements on equipment as compared to the process step of deacidification. If the equipment is required to be compatible with two opposite requirements at the same time, it will be difficult, which will lead to excessively high equipment cost and low equipment cost performance. Therefore, the two process steps of the neutralization kettle and the dealkalization kettle can be integrated and reduced with each other, so that the two process steps can be carried out in the same equipment, i.e., the multi-purpose kettle 13, and will not increase the requirements on the equipment too much, so that the multi-purpose kettle 13 after integration has a higher cost performance. At the same time, the multi-purpose kettle 13 can be used as the deacidification kettle 12 after acid-resistant treatment, which can reduce the types of equipment in the production line, improve the interchangeability of parts between equipment, facilitate the maintenance of subsequent equipment, and reduce the maintenance cost of the production line.

[0041] At the same time, by surface treating the multi-purpose kettle 13 or using a material with good alkali resistance to prepare it, the multi-purpose kettle 13 can simultaneously meet the equipment requirements of the two process steps of neutralization and dealkalization, so that the two steps of neutralization and dealkalization can be carried out in the multi-purpose kettle 13 in sequence, thereby reducing the number of equipment used in the production line, thereby reducing the floor space occupied by the equipment, and facilitating the maintenance of the equipment;

[0042] At the same time, since the neutralization kettle and the dealkalization kettle are combined into one and replaced by a multi-purpose kettle 13, during production, after the neutralization process, the material does not need to be transferred and the dealkalization process can be directly carried out, thereby reducing the length of the material transfer path in the production line and reducing the time spent on material transfer, thereby shortening the entire chlorinated polyethylene production cycle and improving production efficiency.

[0043] As an embodiment of the present invention, a pipeline for conveying CPE materials on the production line is set to have a negative pressure, and the negative pressure in the pipeline promotes the movement of CPE materials to the next level of equipment;

[0044] A crushing valve is installed on the pipeline, and the crushing valve acts as a filter 14, and the crushing valve crushes the CPE material that has agglomerated in the pipeline;

[0045] Since CPE materials are transferred between various devices in the production line through interconnected pipelines, negative pressure is applied to the pipelines that transport CPE materials through an external negative pressure gas source, so that the CPE materials in the transfer process are affected and pushed by the negative pressure in the pipeline, thereby accelerating and promoting the movement speed of CPE materials in the pipeline, reducing the time spent on material transfer on the production line, shortening the overall production cycle of chlorinated polyethylene, and improving production efficiency;

[0046] At the same time, by applying negative pressure to the pipeline, the movement of CPE materials inside the pipeline can be promoted, avoiding congestion and blockage of CPE materials in the pipeline, and ensuring the normal operation of the production line;

[0047] At the same time, since CPE materials are prone to agglomeration, when CPE materials are transported through pipelines, agglomerations in the materials will cause pipeline blockage and slow down the material transfer speed, affecting the normal operation of the production line, and reducing the production efficiency of the production line, causing product losses, reducing output, and increasing production costs. Therefore, a crushing valve is installed on the pipeline, such as an anti-caking crushing valve recorded in the prior art with publication number CN207478688U, and the anti-caking crushing valve is installed at the outlet position close to the upper-level equipment, so as to crush the CPE material entering the pipeline to avoid agglomeration in the CPE material, resulting in pipeline blockage and congestion, affecting the normal operation of the production line and reducing the production efficiency of the production line.

[0048] As an embodiment of the present invention, the waste gas sucked out from the pipeline under the action of negative pressure is sent to a waste gas treatment device for centralized treatment;

[0049] Since chlorine is needed in the production process of chlorinated polyethylene, and chlorine cannot be completely reacted in the reaction, when the chlorinated material is transferred, a part of the unreacted chlorine will be discharged along with the material. At the same time, in the subsequent deacidification process, the floating waste gas will contain hydrogen chloride gas, and the hydrogen chloride gas will also be discharged along with the transfer of the material. Therefore, when negative pressure is applied to the pipeline, the chlorine and hydrogen chloride harmful gases mixed in the waste gas will be sucked away together. Therefore, after negative pressure is applied to the pipeline, the generated waste gas is collected and sent to a waste gas treatment device, such as an absorption tower, to absorb and treat harmful gases such as chlorine and hydrogen chloride in the waste gas to avoid direct discharge of waste gas, which will cause environmental pollution and affect the health of workers.

[0050] As an embodiment of the present invention, the multi-purpose kettle 13 includes a kettle body 2, a feed port and a discharge port are installed on the kettle body 2, a motor 21 is installed on the kettle body 2, a rotating shaft 22 is installed in the kettle body 2, the motor 21 drives the rotating shaft 22 to move, a guide cylinder 3 is installed at the lower end of the rotating shaft 22 through a connecting rod 24, the lower end of the guide cylinder 3 is in contact with the bottom surface of the kettle body 2, a stirring blade 5 is installed on the guide cylinder 3, and a paddle 32 is installed at the lower end of the guide cylinder 3, and the paddle 32 stirs the material near the bottom surface of the kettle body 2;

[0051] A spiral plate 31 is installed on the inner wall of the guide cylinder 3, and a notch 34 is opened at the lower end of the guide cylinder 3;

[0052] During operation, after the material is transferred to the multi-purpose kettle 13, the motor 21 is started through the controller, so that the motor 21 drives the rotating shaft 22 and the guide cylinder 3 to rotate, and the material and the alkali solution or the material and the clean water in the kettle body 2 are stirred by the stirring blade 5 and the paddle 32 installed on the guide cylinder 3, so as to promote full contact and mixing between the material and the alkali solution or the material and the clean water, accelerate the speed of material neutralization and material dealkalization, and improve the effect of neutralization and dealkalization, thereby improving the production efficiency of the production line;

[0053] At the same time, when the guide cylinder 3 rotates, the materials that sink downwards and settle to the bottom in the kettle body 2 will be moved by the paddle 32, so that the materials that sink and settle to the bottom are close to the notch 34 at the lower end of the guide cylinder 3. After that, as the guide cylinder 3 rotates, the materials that sink and settle to the bottom will enter the guide cylinder 3 from the notch 34, and then be pushed and transported upward by the spiral plate 31 in the guide cylinder 3, so that the materials that sink and settle to the bottom are moved back to the upper part of the kettle body 2, so as to fully mix the materials with the alkali solution or the materials with the clean water, so that the materials are evenly distributed, which is convenient for the alkali solution and the clean water to flush the materials, thereby improving the effect of neutralization and dealkalization, and accelerating the speed of neutralization and dealkalization, thereby improving the production speed of the production line.

[0054] As an embodiment of the present invention, a dispersion disk 4 is installed at the lower end of the rotating shaft 22, and the connecting rod 24 installs the guide cylinder 3 below the dispersion disk 4;

[0055] The dispersion disk 4 includes an upper plate 41 and a lower plate 42, a plurality of groups of arc-shaped blades 421 are installed between the upper plate 41 and the lower plate 42, a through hole 422 is opened in the middle of the lower plate 42, the through hole 422 is aligned with the opening at the upper end of the guide cylinder 3, and there is a gap between the lower plate 42 and the guide cylinder 3;

[0056] When the motor 21 drives the rotating shaft 22 to rotate, the dispersion plate 4 on the rotating shaft 22 will also rotate synchronously. At the same time, when the dispersion plate 4 rotates, the material and liquid between the upper plate 41 and the lower plate 42 will be thrown out under the action of centrifugal force, which promotes the material moved back to the upper part of the kettle body 2 to be dispersed and mixed in the kettle body 2, improves the uniformity between the material and the liquid in the kettle body 2, and improves the speed and effect of neutralization and dealkalization.

[0057] At the same time, during the rotation of the dispersion disk 4, the through hole 422 on the lower plate 42 will generate a negative pressure suction force, thereby attracting the material transported up by the guide cylinder 3, promoting the re-moved material to enter the dispersion disk 4, and be dispersed and thrown away, thereby promoting the material mixing effect, and improving the effect and speed of neutralization and dealkalization. At the same time, the through hole 422 on the dispersion disk 4 sucks the material, which can prevent the re-transported material from piling up and accumulating at the opening at the upper end of the guide cylinder 3, thereby facilitating the transfer of the material in the kettle body 2, and improving the upward transportation of the material by the guide cylinder 3, thereby preventing the material from stagnating in the guide cylinder 3 and affecting the normal operation of the multi-purpose kettle 13;

[0058] At the same time, due to the limitation of the rotation speed of the rotating shaft 22 in the kettle body 2 and the installation position of the dispersion plate 4 in the kettle body 2, the negative pressure suction force at the through hole 422 on the dispersion plate 4 is relatively weak, and the dispersion plate 4 only sucks and shakes off the liquid in the vicinity of the area below it. At this time, combined with the upward transportation of the sinking and bottomed materials by the guide cylinder 3, the dispersion plate 4 can throw and shake off the materials in the kettle body 2, promote the uniform dispersion of the materials, and then improve the effect and efficiency of neutralization and dealkalization, thereby avoiding the separate arrangement of the dispersion plate 4, which results in the dispersion plate 4 only being able to absorb and shake off the liquid in the upper area of ​​the kettle body 2. The liquid with less material is thrown and thrown away, so that the positive effect of the dispersion plate 4 on the mixing of the materials in the kettle body 2 is not obvious, and the sinking and settling of the materials cannot be effectively stopped. In addition, it can also avoid setting up a separate guide cylinder 3, so that the guide cylinder 3 only transfers the materials that sink and settle to the bottom of the kettle body 2 to the upper part of the kettle body 2, and the transferred materials are still stirred and mixed by the stirring blades 5, which cannot fully improve the dispersion and uniformity of the materials. After being transferred to the upper part of the kettle body 2, the materials are prone to uneven mixing again, and sinking and settling.

[0059] As an embodiment of the present invention, a guide plate 423 is installed at the edge of the lower plate 42, the cross section of the guide plate 423 is an arc-shaped upward, and evenly distributed protrusions 424 are arranged on the edge of the guide plate 423;

[0060] When the dispersion plate 4 disperses and throws out the material, the material will contact the guide plate 423 at the edge of the lower plate 42, thereby changing the throwing and throwing direction of the material, so that the material is thrown in an oblique upward direction, thereby increasing the path length that the material needs to pass when it sinks to the bottom in the kettle body 2, and then facilitating the material to be fully stirred and mixed during the descent process, thereby improving the uniformity between the material and the liquid in the kettle body 2, and improving the effect and speed of neutralization and dealkalization;

[0061] At the same time, when the material is thrown out obliquely upward, the material will contact and impact the protrusion 424 on the guide plate 423, so that the material is further dispersed, thereby promoting the mixing of the material with the liquid in the kettle body 2, improving the uniformity of material distribution, and further improving the effect and speed of neutralization and dealkalization, thereby improving the production efficiency of the production line.

[0062] As an embodiment of the present invention, the upper and lower ends of the guide cylinder 3 are both installed with a fixing plate 33, and the two ends of the connecting rod 24 are respectively installed on the lower plate 42 and the fixing plate 33;

[0063] A mounting ring 51 is slidably mounted on the guide cylinder 3, and the stirring blade 5 is mounted on the mounting ring 51 through a support rod. A spring 52 is installed between the mounting ring 51 and the fixing plate 33;

[0064] The mounting ring 51 is connected to the guide cylinder 3 via a spline;

[0065] When the guide cylinder 3 rotates, the stirring blades installed on the guide cylinder 3 through the spline will also rotate synchronously, thereby stirring the material and liquid in the kettle body 2, promoting the uniform distribution of the material and liquid, and improving the effect and speed of neutralization and dealkalization. At the same time, since the mounting ring 51 for installing the stirring blades is slidably installed on the guide cylinder 3, and the mounting ring 51 is interconnected with the fixed plate 33 through the spring 52, during the stirring process, the stirring blades will move up and down, changing the relative position of the stirring blades in the kettle body 2, so that the stirring blades 5 stir the materials and liquids at different positions in the kettle body 2, and promote the full mixing and uniform distribution of the two, which is convenient for improving the effect and speed of neutralization and dealkalization, and accelerating the production efficiency of the production line. At the same time, the up and down movement of the stirring blades 5 can also further improve the stirring effect, avoid the material in the kettle body 2 from sinking downward and sinking to the bottom, and avoid affecting the normal operation of the multi-purpose kettle 13.

[0066] As an embodiment of the present invention, a positioning shaft 23 is installed on the bottom surface of the kettle body 2, and the positioning shaft 23 passes through the middle of the spiral plate 31 in the guide cylinder 3. The positioning shaft 23 and the spiral plate 31 are in contact with each other, and the upper end of the positioning shaft 23 and the lower end of the rotating shaft 22 are rotatably connected to each other;

[0067] Through the rotational connection between the positioning shaft 23 and the rotating shaft 22, the positioning shaft 23 disperses and bears the weight of the rotating shaft 22, the dispersion disk 4, and the guide cylinder 3, thereby preventing the weight of the rotating shaft 22, the dispersion disk 4, the guide cylinder 3 and even the motor 21 from being all pressed on the upper end of the kettle body 2, so as to avoid crushing the kettle body 2 and affecting the service life of the multi-purpose kettle 13. At the same time, through the connection between the positioning shaft 23 and the rotating shaft 22, when the rotating shaft 22 rotates, the position of the lower end of the rotating shaft 22 is limited and stabilized, thereby preventing the rotating shaft 22 from shaking or swaying when the rotating shaft 22 rotates, affecting the normal operation and service life of the multi-purpose kettle 13. At the same time, since the positioning shaft 23 passes through the middle of the spiral plate 31 in the guide cylinder 3, the spiral plate 31 is positioned and fixed by the positioning shaft 23, thereby improving the stability of the spiral plate 31, thereby improving the material conveying effect and preventing the spiral plate 31 from being deformed or damaged.

[0068] The specific workflow is as follows:

[0069] During production, clean water is added to the reactor 11, and then the high-density polyethylene special material and the additive are added to the reactor 11, and then the reactor 11 is heated. After the temperature is raised to the reaction temperature, chlorine gas is introduced into the reactor 11 for reaction. After the reaction is completed, the reactor 11 is insulated and cooled. After that, the chlorinated material in the reactor 11 is transferred to the deacidification reactor 12 through the pipelines between the various devices, and the chlorinated material is rinsed with clean water to remove the hydrochloric acid contained in the material. After that, the material is transferred to the neutralization reactor, the temperature is raised and alkali is added to neutralize the hydrochloric acid inside the material. After that, the material is transferred to the dealkali reactor, and the material is rinsed with clean water again to remove the alkali solution contained in the material. After that, the material is treated by a centrifuge 15 to separate the material and the water from each other to obtain a wet material. After that, the material is transferred to the drying bed 16 to dry the material. After the material is dried, an isolation agent is added to the material, and after the material and the isolation agent are evenly mixed, it is packaged to obtain a finished CPE product;

[0070] During the production process, the materials in the deacidification kettle 12, the neutralization kettle and the dealkalization kettle need to be stirred to promote the mixing of the materials with the clean water, alkali solution and clean water. The materials in the deacidification kettle 12 contain hydrochloric acid, which requires the deacidification kettle 12 to have good acid resistance. The materials in the neutralization kettle and the dealkalization kettle both contain alkali, which requires the neutralization kettle and the dealkalization kettle to have good alkali resistance. Therefore, the requirements for equipment in the two process steps of neutralization and dealkalization are completely opposite to those in the process steps of deacidification. Therefore, the two process steps of the neutralization kettle and the dealkalization kettle can be integrated and reduced so that the two process steps are carried out in the same equipment, that is, the multi-purpose kettle 13. At the same time, the multi-purpose kettle 13 is treated with acid resistance and then used as the deacidification kettle 12, which can reduce the types of equipment in the production line and improve the interchangeability of parts between equipment.

[0071] At the same time, by surface treating the multi-purpose kettle 13 or using a material with good alkali resistance to prepare it, the multi-purpose kettle 13 can simultaneously meet the equipment requirements of the two process steps of neutralization and dealkalization, so that the two steps of neutralization and dealkalization can be carried out in the multi-purpose kettle 13 in sequence;

[0072] At the same time, since the neutralization kettle and the dealkalization kettle are combined into one, the multi-purpose kettle 13 is used instead, so that during production, after the neutralization process, the material does not need to be transferred, and the dealkalization process can be directly processed, thereby reducing the length of the material transfer path in the production line and reducing the time spent on material transfer;

[0073] Since CPE materials are transferred between various devices in the production line through interconnected pipelines, negative pressure is applied to the pipelines that transport CPE materials through an external negative pressure gas source, so that the CPE materials in the transfer process are affected and pushed by the negative pressure in the pipeline, thereby accelerating and promoting the movement speed of the CPE materials in the pipeline;

[0074] At the same time, a crushing valve is installed on the pipeline, such as an anti-caking crushing valve recorded in the prior art with the publication number CN207478688U, and the anti-caking crushing valve is installed near the outlet of the upper-level equipment, so as to crush the CPE material entering the pipeline, and avoid agglomeration in the CPE material, which leads to pipeline blockage and congestion;

[0075] Since chlorine is required in the production process of chlorinated polyethylene, and chlorine cannot be completely reacted in the reaction, when the chlorinated material is transferred, a part of the unreacted chlorine will be discharged together with the material. At the same time, in the subsequent deacidification process, the floating waste gas will contain hydrogen chloride gas, and the hydrogen chloride gas will also be discharged together with the transfer of the material. Therefore, when negative pressure is applied to the pipeline, the chlorine and hydrogen chloride harmful gases mixed in the waste gas will be sucked away together. Therefore, after negative pressure is applied to the pipeline, the generated waste gas is collected and sent to the waste gas treatment device, such as the absorption tower, to absorb and treat the harmful gases such as chlorine and hydrogen chloride in the waste gas to avoid direct discharge of the waste gas;

[0076] During operation, after the material is transferred to the multi-purpose kettle 13, the motor 21 is started by the controller, so that the motor 21 drives the rotating shaft 22 and the guide cylinder 3 to rotate, and the material and alkali solution or the material and purified water in the kettle body 2 are stirred by the stirring blade 5 and the paddle 32 installed on the guide cylinder 3;

[0077] At the same time, when the guide cylinder 3 rotates, the materials that sink downwards and settle to the bottom in the kettle body 2 will be moved by the paddle 32, so that the materials that sink downwards and settle to the bottom are close to the notch 34 at the lower end of the guide cylinder 3. Then, as the guide cylinder 3 rotates, the materials that sink downwards and settle to the bottom will enter the guide cylinder 3 from the notch 34, and then be pushed and transported upwards by the spiral plate 31 in the guide cylinder 3, so that the materials that sink downwards and settle to the bottom are moved back to the upper part of the kettle body 2.

[0078] When the motor 21 drives the rotating shaft 22 to rotate, the dispersion plate 4 on the rotating shaft 22 will also rotate synchronously. At the same time, when the dispersion plate 4 rotates, the material and liquid between the upper plate 41 and the lower plate 42 will be thrown out under the action of centrifugal force, so as to promote the material moved back to the upper part of the kettle body 2 to be dispersed and mixed in the kettle body 2.

[0079] At the same time, during the rotation of the dispersion disk 4, the through hole 422 on the lower plate 42 generates a negative pressure suction force, thereby attracting the material transported up by the guide cylinder 3, and promoting the re-moved material to enter the dispersion disk 4;

[0080] When the dispersion plate 4 disperses and throws out the materials, the materials will contact the guide plate 423 at the edge of the lower plate 42, causing the materials to be thrown out in an oblique upward direction;

[0081] At the same time, when the material is thrown out obliquely upward, the material will contact and impact the protrusion 424 on the guide plate 423, so that the material is further dispersed, promoting the mixing of the material with the liquid in the kettle body 2, and improving the uniformity of the material distribution;

[0082] When the guide cylinder 3 rotates, the stirring blades installed on the guide cylinder 3 through the spline will also rotate synchronously, thereby stirring the material and liquid in the kettle body 2. At the same time, since the mounting ring 51 for mounting the stirring blades is slidably mounted on the guide cylinder 3, and the mounting ring 51 is connected to the fixing plate 33 through the spring 52, the stirring blades will move up and down during the stirring process, changing the relative position of the stirring blades in the kettle body 2, so that the stirring blades 5 can stir the materials and liquids at different positions in the kettle body 2.

[0083] Through the rotational connection between the positioning shaft 23 and the rotating shaft 22, the positioning shaft 23 disperses and bears the weight of the rotating shaft 22, the dispersion disk 4, and the guide cylinder 3. At the same time, through the connection between the positioning shaft 23 and the rotating shaft 22, when the rotating shaft 22 rotates, the position of the lower end of the rotating shaft 22 is limited and stabilized, thereby avoiding the shaking and swaying of the rotating shaft 22. At the same time, the spiral plate 31 is positioned and fixed by the positioning shaft 23, thereby improving the stability of the spiral plate 31, thereby improving the material conveying effect and avoiding the spiral plate 31 from deformation and damage.

[0084] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A production line for producing chlorinated polyethylene, comprising a reaction kettle (11), a deacidification kettle (12), a neutralization kettle, a dealkalization kettle, a centrifuge (15) and a drying bed (16) connected in sequence, wherein the reaction kettle (11) is used for chlorination reaction, the deacidification kettle (12) is used for deacidification of chlorinated materials, the neutralization kettle is used for neutralizing hydrochloric acid in the materials, the dealkalization kettle is used for removing alkali solution used in the neutralization process, the centrifuge (15) is used for separating materials and water, the drying bed (16) is used for drying CPE materials, and the low-concentration hydrochloric acid wastewater generated by the deacidification kettle (12) is sent to a storage tank (1) for storage; Features: In the production line, a multi-purpose kettle (13) is used to replace the neutralization kettle and the dealkalization kettle. The neutralization and dealkalization processes in the production line are carried out in the same multi-purpose kettle (13) in a sequential order. The neutralization kettle and the dealkalization kettle are served by the multi-purpose kettle (13) whose inner surface is treated with alkali resistance, and the deacidification kettle (12) is served by the multi-purpose kettle (13) whose inner surface is treated with acid resistance. The multi-purpose kettle (13) comprises a kettle body (2), the kettle body (2) is provided with a feed inlet and a discharge outlet, the kettle body (2) is provided with a motor (21), a rotating shaft (22) is provided in the kettle body (2), the motor (21) drives the rotating shaft (22) to move, a guide cylinder (3) is provided at the lower end of the rotating shaft (22) via a connecting rod (24), the lower end of the guide cylinder (3) is in contact with the bottom surface of the kettle body (2), a stirring blade (5) is provided on the guide cylinder (3), a paddle (32) is provided at the lower end of the guide cylinder (3), and the paddle (32) stirs the material near the bottom surface of the kettle body (2); A spiral plate (31) is installed on the inner wall of the guide cylinder (3), and a notch (34) is opened at the lower end of the guide cylinder (3); A dispersion disk (4) is installed at the lower end of the rotating shaft (22), and the connecting rod (24) installs the guide cylinder (3) below the dispersion disk (4); The dispersion disk (4) comprises an upper plate (41) and a lower plate (42), a plurality of groups of arc-shaped blades (421) are installed between the upper plate (41) and the lower plate (42), a through hole (422) is opened in the middle of the lower plate (42), the through hole (422) is aligned with the opening at the upper end of the guide cylinder (3), and a gap exists between the lower plate (42) and the guide cylinder (3); A guide plate (423) is installed at the edge of the lower plate (42); the cross section of the guide plate (423) is an arc-shaped shape facing upwards; and evenly distributed protrusions (424) are arranged on the edge of the guide plate (423).

2. A production line for producing chlorinated polyethylene according to claim 1, characterized in that: The pipeline for conveying CPE materials on the production line is set to negative pressure, and the negative pressure in the pipeline promotes the movement of CPE materials to the next level of equipment; The pipeline is provided with a crushing valve, which acts as a filter (14) and crushes the agglomerated CPE materials in the pipeline.

3. A production line for producing chlorinated polyethylene according to claim 2, characterized in that: The waste gas sucked out of the pipeline under the action of negative pressure is sent to the waste gas treatment device for centralized treatment.

4. A production line for producing chlorinated polyethylene according to claim 1, characterized in that: The upper and lower ends of the guide cylinder (3) are both mounted with fixing plates (33), and the two ends of the connecting rod (24) are respectively mounted on the lower plate (42) and the fixing plate (33); A mounting ring (51) is slidably mounted on the guide cylinder (3), the stirring blade (5) is mounted on the mounting ring (51) via a support rod, and a spring (52) is mounted between the mounting ring (51) and the fixing plate (33); The mounting ring (51) and the guide cylinder (3) are connected via a spline.

5. A production line for producing chlorinated polyethylene according to claim 1, characterized in that: A positioning shaft (23) is installed on the bottom surface of the kettle body (2). The positioning shaft (23) passes through the middle of the spiral plate (31) in the guide cylinder (3). The positioning shaft (23) and the spiral plate (31) are in contact with each other. The upper end of the positioning shaft (23) and the lower end of the rotating shaft (22) are rotatably connected to each other.

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