A filter for high viscosity phosphite intermediate storage tank
Patent Information
- Application Number
- CN202521858841.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-29
- Publication Date
- 2026-08-18
- Estimated Expiration
- 2035-08-29
AI Technical Summary
一方面，常规压滤装置在低温环境（如 60℃以下）中，难以对高粘度液体实现快速过滤，过滤效率低下；另一方面，若通过升高温度降低液体粘度以提升过滤速度，会导致碳酸钾在液体亚磷酸酯中的溶解度增大，这直接造成过滤后的液体亚磷酸酯在冷却过程中，已溶解的碳酸钾重新析出，使产品呈现混浊状态，不仅过滤效果大打折扣，更对下游工序的正常进行产生不利影响
[0012]本实用新型的技术效果和优点：该过滤高粘度亚磷酸酯的中间储罐，由于在液体亚磷酸酯中，氯化钾的溶解度随温度升高而降低，基于这一特性，先将干燥氯化氢气体通入含有碳酸钾催化剂的高温（＞100摄氏度）液体亚磷酸酯中，使碳酸钾转化为氯化钾，由于氯化钾在高温下溶解度减小，会从液体物料中析出，同时高温还能降低高粘度液体亚磷酸酯的粘度，双重作用共同实现了过滤速度快、催化剂去除彻底的效果。
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Figure CN224641081U_ABST
Abstract
Description
Technical Field
[0001] This utility model specifically relates to an intermediate storage tank for filtering high-viscosity phosphite. Background Technology
[0002] In the production of high-viscosity liquid phosphites (such as phenylenedi(C12-14) alkyl phosphites, non-toxic phosphites, poly(dipropylene glycol) phosphites, etc.), solid heterogeneous catalyst potassium carbonate is required. After the production stage, this potassium carbonate must be removed by filtration, but a significant contradiction exists in actual operation: On the one hand, conventional filter presses struggle to rapidly filter high-viscosity liquids in low-temperature environments (such as below 60°C), resulting in low filtration efficiency. On the other hand, increasing the temperature to reduce liquid viscosity and thus improve filtration speed leads to increased solubility of potassium carbonate in liquid phosphite. This directly causes the dissolved potassium carbonate to re-precipitate during the cooling process of the filtered liquid phosphite, resulting in a turbid product. This not only significantly reduces the filtration effect but also negatively impacts the normal operation of downstream processes.
[0003] Therefore, how to achieve both rapid filtration of the catalyst and complete removal in the production of high-viscosity liquid phosphite has become a critical issue that urgently needs to be addressed. Utility Model Content
[0004] The purpose of this invention is to provide an intermediate storage tank for filtering high-viscosity phosphites, so as to solve the problems mentioned in the background art.
[0005] To achieve the above objectives, this utility model provides the following technical solution: an intermediate storage tank for filtering high-viscosity phosphite, comprising: The tank body is equipped with a feed inlet, a gas inlet, a vacuum interface, a discharge outlet, and a vent outlet, each controlled independently by a valve; an agitator is located inside the tank body; The gas inlet is used to introduce dry hydrogen chloride gas into the tank to convert potassium carbonate into potassium chloride and precipitate it; the vacuum port is used to discharge the carbon dioxide and water vapor generated in the reaction; and the discharge port is used to send the high-viscosity phosphite after the potassium chloride is precipitated to the filtration equipment.
[0006] Preferably, the feed inlet is connected to the reactor via a first valve.
[0007] Preferably, the gas inlet is connected to a dry hydrogen chloride gas source via a second valve.
[0008] Preferably, the vacuum interface is connected to the vacuum system via a third valve.
[0009] Preferably, the discharge port is connected to the filtration equipment via a fourth valve.
[0010] Preferably, the vent is connected to the exhaust gas treatment system via a fifth valve.
[0011] Preferably, the agitator is used to ensure that the high-viscosity phosphite and potassium carbonate are in full contact when dry hydrogen chloride gas is introduced.
[0012] The technical effects and advantages of this utility model are as follows: In this intermediate storage tank for filtering high-viscosity phosphite, the solubility of potassium chloride in liquid phosphite decreases with increasing temperature. Based on this characteristic, dry hydrogen chloride gas is first introduced into the high-temperature (>100 degrees Celsius) liquid phosphite containing potassium carbonate catalyst, causing potassium carbonate to be converted into potassium chloride. Since the solubility of potassium chloride decreases at high temperatures, it will precipitate from the liquid material. At the same time, the high temperature can also reduce the viscosity of the high-viscosity liquid phosphite. The dual effects work together to achieve the effects of fast filtration speed and thorough catalyst removal. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the overall system of this utility model.
[0014] In the diagram: 1. Tank body; 2. Feed inlet; 3. Gas inlet; 4. Vacuum interface; 5. Discharge outlet; 6. Vent outlet; 7. Agitator; 8. First valve; 9. Second valve; 10. Third valve; 11. Fourth valve; 12. Fifth valve. Detailed Implementation
[0015] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.
[0016] To improve the rapid filtration of the catalyst, refer to Figure 1 As shown, the system includes a tank 1, which has a feed inlet 2, a gas inlet 3, a vacuum interface 4, a discharge outlet 5, and a vent outlet 6, each independently controlled by a valve; and a stirring paddle 7, located inside the tank 1. The gas inlet 3 is used to introduce dry hydrogen chloride gas into the tank 1 to convert potassium carbonate into potassium chloride and precipitate it. The vacuum interface 4 is used to discharge the carbon dioxide and water vapor generated during the reaction. The discharge outlet 5 is used to send the high-viscosity phosphite after potassium chloride precipitation to a filtration device. Since the solubility of potassium chloride in liquid phosphite decreases with increasing temperature, based on this characteristic, dry hydrogen chloride gas is first introduced into the high-temperature (>100 degrees Celsius) liquid phosphite containing a potassium carbonate catalyst to convert potassium carbonate into potassium chloride. Because the solubility of potassium chloride decreases at high temperatures, it precipitates from the liquid material. Simultaneously, the high temperature also reduces the viscosity of the high-viscosity liquid phosphite. This dual action achieves rapid filtration and thorough catalyst removal.
[0017] To achieve the final removal of the catalyst, refer to Figure 1 As shown, the feed inlet 2 is connected to the reactor via the first valve 8, the gas inlet 3 is connected to the dry hydrogen chloride gas source via the second valve 9, the vacuum interface 4 is connected to the vacuum system via the third valve 10, the discharge port 5 is connected to the filtration equipment via the fourth valve 11, and the vent port 6 is connected to the tail gas treatment system via the fifth valve 12. After the reaction is completed, the first valve 8 and the fifth valve 12 are opened, and the remaining valves are closed. High-viscosity phosphite containing solid potassium carbonate catalyst and with a temperature higher than 100°C flows from the reactor into the tank 1 through the feed inlet 2; after all the material has entered, the first valve 8 and the fifth valve 12 are closed. Start the agitator 7 to keep the material in the tank uniform. Then open the second valve 9 and the third valve 10, while keeping the other valves closed. Dry hydrogen chloride gas enters the tank 1 through the gas inlet 3 and reacts with potassium carbonate to produce potassium chloride, carbon dioxide, and water vapor. The generated carbon dioxide and water vapor are continuously removed through the vacuum interface 4 under vacuum. Potassium chloride precipitates due to its reduced solubility at high temperatures and is suspended in solid form in the high-viscosity phosphite. After the reaction is complete, close the second valve 9 and the third valve 10, stop the agitator 7, and allow the potassium chloride particles to settle fully or disperse evenly in the material, preparing for subsequent filtration. Open the fifth valve 12 and the fourth valve 11. After the tank 1 returns to normal pressure, the high-viscosity phosphite containing potassium chloride solids is discharged directly into the downstream filtration equipment through the outlet 5 by gravity or residual pressure, completing the final removal of the catalyst. The agitator 7 is used to ensure sufficient contact between the high-viscosity phosphite and potassium carbonate when dry hydrogen chloride gas is introduced.
[0018] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model.
Claims
1. An intermediate storage tank for filtering high-viscosity phosphites, characterized in that, include: The tank (1) is provided with a feed inlet (2), a gas inlet (3), a vacuum interface (4), a discharge outlet (5) and a vent outlet (6), each of which is independently controlled by a valve; A stirring paddle (7) is placed inside the tank (1); The gas inlet (3) is used to introduce dry hydrogen chloride gas into the tank (1) so that potassium carbonate is converted into potassium chloride and precipitated; the vacuum port (4) is used to discharge the carbon dioxide and water vapor generated by the reaction; and the discharge port (5) is used to send the high viscosity phosphite after the potassium chloride is precipitated to the filtration equipment.
2. The intermediate storage tank for filtering high-viscosity phosphite according to claim 1, characterized in that: The feed inlet (2) is connected to the reactor via the first valve (8).
3. The intermediate storage tank for filtering high-viscosity phosphite according to claim 1, characterized in that: The gas inlet (3) is connected to a dry hydrogen chloride gas source via a second valve (9).
4. The intermediate storage tank for filtering high-viscosity phosphite according to claim 1, characterized in that: The vacuum interface (4) is connected to the vacuum system via the third valve (10).
5. The intermediate storage tank for filtering high-viscosity phosphite according to claim 1, characterized in that: The discharge port (5) is connected to the filtration equipment via the fourth valve (11).
6. The intermediate storage tank for filtering high-viscosity phosphite according to claim 1, characterized in that: The vent (6) is connected to the exhaust gas treatment system via the fifth valve (12).
7. The intermediate storage tank for filtering high-viscosity phosphite according to claim 1, characterized in that: The stirring paddle (7) is used to ensure that the high-viscosity phosphite and potassium carbonate are in full contact when dry hydrogen chloride gas is introduced.