A pre-neutralization treatment system for para-aramid resin
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-27
- Publication Date
- 2026-08-11
AI Technical Summary
由于对位芳纶生产过程中发生的缩聚反应产出的副产品为HCl，存在较强的腐蚀性，故容易在后处理过程中对研磨装置、水洗装置等高端设备造成严重的腐蚀，增加设备维护成本，同时也增加劳动力
[0012] This invention neutralizes the HCl generated during the synthesis of para-aramid resin, thereby reducing the corrosion of the grinding equipment, subsequent washing equipment, and related auxiliary pipelines by hydrochloric acid. The process mainly involves preparing a 20% (wt) NaOH solution, then mixing the recycled wash water from the washing stage with the 20wt% NaOH solution to create approximately a 10% (wt) NaOH solution. This solution is then pre-neutralized by spraying through the nozzles of the feeding tank. Furthermore, during the grinding process, solid materials require rinsing water to ensure smooth powder feeding. The two-stage grinding rinsing water uses a mixed solution (recycled wash water and 20wt% NaOH solution), which is sprayed through nozzles for further neutralization. After neutralization, the pH of the resin slurry is controlled at 4-5, thus reducing the corrosion of the equipment by hydrochloric acid.
Smart Images
Figure CN224613833U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a post-treatment system for para-aramid resin, specifically a pre-neutralization treatment system for para-aramid resin. Background Technology
[0002] Para-aramid (poly(p-phenylene terephthalamide),) is a typical representative of high-performance organic fibers, and its research background is rooted in the urgent need for lightweight and ultra-high-strength materials in modern industry and defense. Since DuPont first achieved the industrial production of Kevlar in the 1960s, para-aramid, due to its unique rigid molecular chain structure and liquid crystal spinning characteristics, has exhibited specific strength surpassing that of steel and excellent high-temperature resistance and flame retardant properties, rapidly becoming a core material in high-end fields such as bulletproof protection, aerospace, and optical cable reinforcement. For the production of para-aramid, the synthesis of aramid resin is a key step in the preparation of high-performance aramid fibers. Because the byproduct of the polycondensation reaction during the production of para-aramid is HCl, which is highly corrosive, it easily causes severe corrosion to high-end equipment such as grinding and washing devices during post-processing, increasing equipment maintenance costs and labor costs. Utility Model Content
[0003] The purpose of this invention is to provide a pre-neutralization treatment system for para-aramid resin, which is simple to operate, has obvious effects, and solves the problems existing in the prior art.
[0004] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: A pre-neutralization treatment system for para-aramid resin includes a main alkali pipeline, a feeding tank, a primary grinding device, a secondary grinding device, and a slurry tank. The feeding tank, the primary grinding device, and the secondary grinding device are equipped with alkali nozzles. The main alkali pipeline branches off at its end with three parallel alkali branch pipelines, which are respectively connected to the alkali nozzles in the feeding tank, the primary grinding device, and the secondary grinding device. The resin outlet at the bottom of the feeding tank is connected to the resin inlet of the primary grinding device via a pipeline. The resin outlet of the primary grinding device is connected to the resin inlet of the secondary grinding device via a pipeline. The resin outlet of the secondary grinding device is connected to the inlet of the slurry tank via a pipeline.
[0005] Furthermore, the main alkali solution pipeline is connected to the recycled water washing water pipeline, so that the alkali solution is diluted with recycled water washing water before being sent to each branch alkali solution pipeline.
[0006] Furthermore, a flow meter and a regulating valve are installed on the main alkali pipeline, and a pH meter is installed on the slurry tank. The regulating valve and the pH meter are interlocked.
[0007] Furthermore, the feeding tank is equipped with at least three alkali nozzles, one of which is located at the top of the feeding tank, and the other two are located opposite each other at different heights on the inner side wall of the feeding tank.
[0008] Furthermore, the angle between the resin inlet pipe of the primary grinding device and the horizontal plane is greater than or equal to 60° and not higher than 90°, and the primary grinding device has at least one alkali nozzle, which is located on the inner wall of the primary grinding device.
[0009] Furthermore, the angle between the resin inlet pipe of the secondary grinding device and the horizontal plane is greater than or equal to 60° and not higher than 90°, and the secondary grinding device is equipped with at least four alkaline nozzles, which are located on the inner wall of the secondary grinding device.
[0010] Furthermore, a stirrer is installed inside the slurry tank.
[0011] Furthermore, the alkaline nozzles in the secondary grinding device are arranged in pairs, with the two alkaline nozzles in the same group facing each other, and there are at least two groups arranged vertically.
[0012] This invention neutralizes the HCl generated during the synthesis of para-aramid resin, thereby reducing the corrosion of the grinding equipment, subsequent washing equipment, and related auxiliary pipelines by hydrochloric acid. The process mainly involves preparing a 20% (wt) NaOH solution, then mixing the recycled wash water from the washing stage with the 20wt% NaOH solution to create approximately a 10% (wt) NaOH solution. This solution is then pre-neutralized by spraying through the nozzles of the feeding tank. Furthermore, during the grinding process, solid materials require rinsing water to ensure smooth powder feeding. The two-stage grinding rinsing water uses a mixed solution (recycled wash water and 20wt% NaOH solution), which is sprayed through nozzles for further neutralization. After neutralization, the pH of the resin slurry is controlled at 4-5, thus reducing the corrosion of the equipment by hydrochloric acid. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the structure of this utility model. In the figure, 1 is a flow meter, 2 is a regulating valve, 3, 4, 5, 8, 9, 10, 11, 12 are alkali nozzles, 6 is a feeding tank, 7 is a primary grinding device, 13 is a secondary grinding device, 14 is a slurry tank, 15 is a pH meter, 16 is a stirrer, 17 is a resin preform inlet, and 18 is recycled washing water. Detailed Implementation
[0014] To clearly illustrate the technical features of this solution, the process will be described in detail below through specific implementation methods and in conjunction with the accompanying drawings. Example 1
[0015] A pre-neutralization treatment system for para-aramid resin, such as Figure 1As shown, the system includes a main alkali pipeline, a feeding tank 6, a primary grinding device 7, a secondary grinding device 13, and a slurry tank 14. The feeding tank 6 is equipped with alkali nozzles 3, 4, and 5. The primary grinding device 7 is equipped with an alkali nozzle 8. The secondary grinding device 13 is equipped with alkali nozzles 9, 10, 11, and 12. The main alkali pipeline has three parallel branch pipelines at its end, which are connected to the alkali nozzles in the feeding tank 6, the primary grinding device 7, and the secondary grinding device 13, respectively. The top of the feeding tank 6 is equipped with a resin inlet 17, and the bottom of the feeding tank 6 is equipped with a resin outlet. The bottom resin outlet is connected to the resin inlet of the primary grinding device 7 through a pipeline. The resin outlet of the primary grinding device 7 is connected to the resin inlet of the secondary grinding device 13 through a pipeline. The resin outlet of the secondary grinding device 13 is connected to the inlet of the slurry tank 14 through a pipeline.
[0016] The main alkali solution pipeline is equipped with a flow meter 1 and a regulating valve 2, while the slurry tank 14 is equipped with a pH meter 15. The regulating valve 2 and the pH meter 15 are interlocked. The main alkali solution pipeline is connected to the recycled water washing water pipeline 18, so that the alkali solution is diluted with recycled water washing water before being sent to each branch alkali solution pipeline.
[0017] In this embodiment, the feeding tank 6 is provided with three alkaline nozzles 3, 4 and 5, one of which is located at the top of the feeding tank 6, and the other two are arranged opposite each other at different heights on the inner side wall of the feeding tank 6.
[0018] In this embodiment, the angle between the resin inlet pipe of the primary grinding mill device 7 and the horizontal plane is greater than or equal to 60° and not higher than 90°. An alkaline nozzle 8 is provided inside the primary grinding mill device 7 and is located on the inner side wall of the primary grinding mill device 7.
[0019] In this embodiment, the angle between the resin inlet pipe of the secondary grinding device 13 and the horizontal plane is greater than or equal to 60° and not higher than 90°. The secondary grinding device 13 is equipped with four alkaline nozzles 9, 10, 11, and 12, which are located on the inner wall of the device. The alkaline nozzles 9, 10, 11, and 12 within the secondary grinding device 13 are arranged in two groups: 10 and 11 form one group, and 9 and 12 form another. Within each group, two alkaline nozzles are positioned opposite each other, with two groups arranged vertically.
[0020] In this embodiment, a stirrer 16 is provided inside the slurry tank 14.
[0021] The main process of this invention is as follows: the para-aramid resin preform is conveyed to the feeding tank 6, and then passes through the primary grinding device 7 and the secondary grinding device 13 by gravity, finally entering the resin slurry tank 14. The resin slurry is then stirred by the agitator 16 to ensure it remains in suspension. During this process, the resin preform is mixed with 20wt% NaOH solution and recycled washing water 18, and then passes through the flow meter 1. The flow rate of the alkali solution is precisely controlled by the regulating valve 2, which is interlocked with the pH meter 15 installed on the resin slurry tank 14. The alkali solution then pre-neutralizes the hydrochloric acid in the resin preform through alkali nozzles 3, 4, and 5 in the feeding tank 6, alkali nozzle 8 in the primary grinding device 7, and alkali nozzles 9, 10, 11, and 12 in the secondary grinding device 13, thereby stabilizing the pH in the slurry tank 14 at 4-5 and reducing the corrosion of the equipment and auxiliary pipelines by the material.
[0022] The above specific embodiments should not be construed as limiting the scope of protection of this utility model. For those skilled in the art, any alternative improvements or modifications made to the embodiments of this utility model shall fall within the scope of protection of this utility model.
[0023] Any aspects of this utility model not described in detail are known to those skilled in the art.
Claims
1. A para-aramid resin pre-neutralization treatment system characterized by, It includes a main alkali pipeline, a feeding tank, a primary grinding device, a secondary grinding device, and a slurry tank. The feeding tank, the primary grinding device, and the secondary grinding device are equipped with alkali nozzles. The main alkali pipeline has three parallel alkali branch pipelines at its end. The three alkali branch pipelines are respectively connected to the alkali nozzles in the feeding tank, the primary grinding device, and the secondary grinding device. The resin outlet at the bottom of the feeding tank is connected to the resin inlet of the primary grinding device through a pipeline. The resin outlet of the primary grinding device is connected to the resin inlet of the secondary grinding device through a pipeline. The resin outlet of the secondary grinding device is connected to the inlet of the slurry tank through a pipeline.
2. The para-aramid resin pre-neutralization treatment system according to claim 1, characterized in that, The main alkali solution pipeline is connected to the recycled water washing water pipeline, so that the alkali solution is diluted with recycled water washing water before being sent to each branch alkali solution pipeline.
3. The para-aramid resin pre-neutralization treatment system according to claim 1, characterized in that, The main alkali pipeline is equipped with a flow meter and a regulating valve, and the slurry tank is equipped with a pH meter. The regulating valve and the pH meter are interlocked.
4. The para-aramid resin pre-neutralization treatment system according to claim 1, characterized in that, The feeding tank is equipped with at least three alkali nozzles, one of which is located at the top of the feeding tank, and the other two are located opposite each other at different heights on the inner side wall of the feeding tank.
5. The para-aramid resin pre-neutralization treatment system according to claim 1, characterized in that, The angle between the resin inlet pipe of the primary grinding device and the horizontal plane is greater than or equal to 60° and not higher than 90°. The primary grinding device has at least one alkali nozzle, which is located on the inner wall of the primary grinding device.
6. The para-aramid resin pre-neutralization treatment system according to claim 1, characterized in that, The angle between the resin inlet pipe of the secondary grinding device and the horizontal plane is greater than or equal to 60° and not higher than 90°. The secondary grinding device is equipped with at least four alkaline nozzles, which are located on the inner wall of the secondary grinding device.
7. The para-aramid resin pre-neutralization treatment system according to claim 1, characterized in that, The slurry tank is equipped with a stirrer.
8. The para-aramid resin pre-neutralization treatment system according to claim 6, characterized in that, The alkaline nozzles in the secondary grinding device are arranged in pairs, with the two nozzles in the same group facing each other, and there are at least two groups in total, one above the other.