Device and method for removing anions and cations from resin solution

Abstract

The invention relates to a device and a method for removing anions and cations from a resin solution. The device comprises a preheater device, a feed mixing device, a liquid-liquid mass transfer separation device, an oil-water separation device, a qualified product solution tank and a wastewater treatment device. The preheater device is communicated with the feed mixing device and a to-be-treated resin solution, the feed mixing device is connected with the liquid-liquid mass transfer separation device, the liquid-liquid mass transfer separation device is respectively communicated with the oil-water separation device and the feed mixing device, and the oil-water separation device is respectively communicated with the qualified product solution tank and the wastewater treatment device. According to the invention, the removal rate of cations and anions in the resin solution can be effectively increased, the content of cations and ions in the solution is reduced to 5 [mu] g / g, the content of anions in the solution is reduced to 5 [mu] g / g or less, the time for removing cations and anions in the resin solution is reduced, the use amount of deionized water is reduced, and the resin production cost is reduced obviously.

Description

Technical Field

[0001] The present invention relates to a device and method for removing cations and anions from a resin solution, and in particular to a process for removing cations and anions from electronic material-grade resins and food-grade resins. The deionized resins meet industry and national standards, and belong to the field of resin preparation and purification. Background Art

[0002] The device and method for removing anions and cations from resin solutions are widely used in various scenarios with strict requirements on metal ions or anions, such as electronic material manufacturing, electronic material packaging, food processing, food packaging and other fields. The metal ion content in the product is required to be less than 10μg / g, and the anion content is required to be less than 10μg / g, or even lower.

[0003] There are two main methods for removing anions and cations from traditional resin solutions. One is to use ion exchange resin to remove metal ions or anions in the resin solution. The advantage of this method is that it does not produce a large amount of saline wastewater in the process of removing metal ions and anions, but the cost is high. The other is to use a chelating agent (complexing agent) complexing method, in which the chelating agent is prepared into an aqueous solution and added to the resin solution. The chelating agent and the metal ions or anions in the resin solution are complexed to form a water-soluble complex, thereby removing the metal ions and anions in the resin solution. The advantage of this method is that the removal effect is better, but a large amount of saline wastewater is produced.

[0004] U.S. Patent US20240157354A1 discloses a method and device for manufacturing dry ion exchange resins, a method and device for purifying target liquids. This method can effectively remove anions and cations from target substances, but the ion exchange resins in the patent need to be activated with strong acids and need to be dried under reduced pressure, resulting in a relatively high processing cost for this method.

[0005] CN117925270A discloses a method for preparing a demetallizing agent, an application method thereof and a use of a demetallizing auxiliary agent. The patent adopts a chelating agent to remove nickel and vanadium from a solution, and has a high demetallizing efficiency. However, a large amount of the chelating agent is used, and more than three solution washings are required. A large amount of wastewater containing metal ions is generated, and the adaptability of different metal ions to the chelating agent needs to be investigated.

[0006] CN116655841B discloses a continuous solution polymerization method and system. The patent adopts a complexing agent to complex with target ions. In this method, the complexing temperature of the complexing agent and the solution ions is relatively high, reaching above 80°C, and the complexing agent solution is washed many times.

[0007] CN116655853A discloses a method for demetallizing a polymer. The patent adopts a combination of a complexation method and a resin adsorption method to remove ions from the polymer. The method is conducive to the removal of ions, but the cost is relatively high. Summary of the invention

[0008] The technical problem to be solved by the present invention is that, in view of the high metal ion content in the resin solution, the large amount of deionized water used in the metal ion removal process, the high cost, and the difficulty in removal, the technical scheme of the present invention can effectively improve the removal rate of metal ions in the resin solution, reduce the metal ion content in the solution to below 5μg / g, reduce the anion content to 5μg / g, reduce the deionization time of the resin solution, reduce the amount of deionized water used, and have a significant effect on reducing the resin production cost.

[0009] To solve the above problems, the present invention adopts the following technical solutions: A device for removing anions and cations from a resin solution, comprising a resin solution preheating device and a deionized water preheating device, a primary feed mixing device, a secondary feed mixing device and a tertiary feed mixing device, a primary liquid-liquid mass transfer separation device, a secondary liquid-liquid mass transfer separation device and a tertiary liquid-liquid mass transfer separation device, a primary oil-water separation device, a secondary oil-water separation device and a tertiary oil-water separation device, a qualified product solution tank, and a wastewater treatment device; the resin solution preheating device is respectively connected to a pipeline of a resin solution to be treated and the primary feed mixing device and the tertiary feed mixing device, the deionized water preheating device is respectively connected to a deionized water pipeline and the primary feed mixing device; the primary feed mixing device is respectively connected to the primary liquid-liquid mass transfer separation device and the resin solution pipeline to be treated and the primary feed mixing device and the tertiary ... The fat solution preheating device is connected with the deionized water preheating device, the secondary feeding mixing device is respectively connected with the primary purification resin solution pipeline and the secondary liquid-liquid mass transfer separation device and the tertiary external drainage, the tertiary feeding mixing device is respectively connected with the resin solution preheating device, the tertiary liquid-liquid mass transfer separation device and the secondary purification resin solution pipeline and the tertiary purification resin solution; the primary liquid-liquid mass transfer separation device is connected with the primary oil-water separation device, the secondary liquid-liquid mass transfer separation device is connected with the secondary oil-water separation device, and the tertiary liquid-liquid mass transfer separation device is respectively connected with the tertiary oil-water separation device; the qualified product solution tank is connected with the tertiary purification resin solution pipeline; the wastewater treatment device is respectively connected with the primary external drainage and the secondary external drainage.

[0010] The primary, secondary and tertiary liquid-liquid mass transfer separation devices all include a barrel, fiber filaments, a feed port, and a barrel flange; the primary, secondary and tertiary oil-water separation devices all include an oil-water separation tank, a level meter, a thermometer, a pressure gauge, a purified resin liquid outlet, a resin purified liquid spare outlet, a wastewater discharge outlet, and a wastewater discharge spare outlet.

[0011] The material of the cylinder in the primary, secondary and tertiary liquid-liquid mass transfer separation devices is stainless steel; the material of the fiber filaments is stainless steel or polymer material, and the diameter of the fiber filaments is 25μm~1000μm, preferably 100μm~500μm.

[0012] A method for removing anions and cations from a resin solution, characterized in that it comprises the following steps: (1) The resin solution and deionized water to be treated at a certain concentration are heated to a certain temperature by a resin solution preheating device and a deionized water preheating device respectively, and then the two streams of materials are fully mixed by a primary feed mixer. The mixed materials are then transported to a primary liquid-liquid mass transfer separation device through a pipeline.

[0013] (2) The material is subjected to mass transfer and separation in the primary liquid-liquid mass transfer separation device, and the anions and cations in the resin solution are quickly transferred to water, and then enter the primary oil-water separation device; the oil-water mixture entering the primary oil-water separation device is further settled and stratified; the oil-water interface is controlled by the level meter to achieve the primary purification resin solution discharged from the top of the storage tank and enter the secondary feed mixing device, and the primary external drainage containing anions and cations is discharged from the bottom of the tank and enters the wastewater treatment device.

[0014] (3) The primary purification resin solution and the tertiary external drainage enter the secondary liquid-liquid mass transfer separation device through the secondary feeding mixing device. The oil-water mixture undergoes a mass transfer-separation process in the secondary liquid-liquid mass transfer separation device to further remove the anions and cations in the resin solution, and then enters the secondary oil-water separation device. The oil-water mixture entering the secondary oil-water separation device is further settled and stratified. The oil-water interface is controlled by an interface meter to realize the discharge of the secondary purification resin solution from the top of the storage tank and enter the tertiary feeding mixing device. The secondary external drainage containing anions and cations is discharged from the bottom of the tank and enters the wastewater treatment device.

[0015] (4) The secondary purification resin solution and deionized water enter the tertiary liquid-liquid mass transfer separation device through the tertiary feed mixing device. The oil-water mixture undergoes a mass transfer-separation process in the tertiary liquid-liquid mass transfer separation device to further remove the anions and cations in the resin solution, and then enters the tertiary oil-water separation device. The oil-water mixture entering the tertiary oil-water separation device is further settled and stratified. The oil-water interface is controlled by an interface level meter to discharge the tertiary purification resin solution from the top of the storage tank. After testing, the anion and cation content in the tertiary purification resin solution meets the standard and enters the qualified product tank. The tertiary external drainage is discharged from the bottom of the tank and enters the secondary feed mixing device, thereby achieving the goal of reducing the amount of deionized water used.

[0016] (5) If the anion and cation content of the tertiary purification resin solution does not meet the standard after testing, it will enter the tertiary feed mixer and repeat the steps until the product is qualified.

[0017] The heating medium of the preheating device in step (1) is one of hot water, heat transfer oil, steam or electric heating, preferably hot water or heat transfer oil, and the heating temperature is controlled at 20°C to 90°C, preferably 40°C to 70°C.

[0018] In step (1), the volume ratio of deionized water to the resin solution to be treated is (0.3-5):1, preferably (1-3):1.

[0019] In step (2), step (3) and step (4), the interface position in the oil-water separation tank is controlled at 10% to 80%, preferably 20% to 50%.

[0020] The mass concentration of the resin solution to be treated is 3% to 50%, preferably 5% to 20%.

[0021] The resin to be treated is polyphenylene ether resin, glycidyl ether epoxy resin, etc. Features and beneficial effects of the present invention: The present invention is different from the prior art method of using chemical methods to remove anions or cations in the resin solution to purify the resin solution. The prior art method of purifying resin solutions mainly uses chemical agents or ion exchange resins to remove cations and anions in the resin solution. The chemical agent reacts chemically with the cations and anions in the resin solution to generate a more water-soluble complex or ionic salt, thereby removing the cations and anions in the resin. Although this method can remove the target cations and anions in the resin solution, it has the following problems: ① The introduction of chelating agents brings in new impurities, and subsequent repeated washing with a large amount of deionized water is required (the amount of deionized water used is 3 times that of the present invention), which increases the cost of wastewater treatment. ② Chelating agents are generally carboxylates and organic ammonium salts, which are highly toxic and carcinogenic, and are not conducive to the green and environmentally friendly production concept advocated by the country.

[0022] The traditional resin solution decationization can also meet the application scenario requirements of the existing resin field, but the amount of chelating agent used, the amount of deionized water used, the amount of ion exchange resin used, and the production cost are significantly higher than the present invention. The traditional method is not beneficial to the occupational health of employees, nor is it conducive to the green and environmentally friendly production concept advocated by the country.

[0023] Ion exchange resins are effective in removing alkali metals (lithium ions, sodium ions, potassium ions, etc.) or alkaline earth metals (magnesium ions, calcium ions, etc.), but are not very effective in removing heavy metal cations (copper ions, iron ions, chromium ions, cadmium ions, etc.) in resin solutions. In addition, ion exchange resins are expensive and used ion exchange resins are difficult to regenerate, resulting in a large amount of solid waste, which is not conducive to the green and environmentally friendly production concept advocated by the country.

[0024] The present invention relies on a physical method and utilizes a liquid-liquid mass transfer separation method. The principle is: 1. By using two different liquids (resin solution and deionized water) with different affinities under the same fixed medium (fiber filaments in a liquid-liquid mass transfer separation device), and the solubility of cations and anions in water is greater, the purpose of removing cations and anions in the resin solution is achieved; 2. The liquid-liquid mass transfer separation device contains a large number of fiber filaments, which can significantly increase the contact area between the resin and the deionized water, divide the resin solution and the deionized water into a plurality of mass transfer units, improve the washing efficiency of the unit volume of deionized water, significantly reduce the amount of deionized water used, and reduce or even avoid the use of chelating agents.

[0025] The present invention can achieve the goal of an ion removal rate of more than 99% without using a chelating agent, and the goal of the anion and cation contents in the resin solution after removal being less than 5 μg / g, which can meet the application scenarios in the existing resin field.

[0026] 1. The present invention uses a feed mixing device to achieve full mixing of the resin solution and deionized water, and then transports the mixed solution to a liquid-liquid mass transfer separation device. The liquid-liquid mass transfer separation device is equipped with a large number of fiber filaments to increase the contact area between the anions and cations in the resin solution and the deionized water, thereby improving the mass transfer efficiency and the anion and cation removal rate.

[0027] 2. The liquid-liquid mass transfer separation device of the present invention has a long service life and does not require deliberate maintenance during the production cycle, thereby achieving the goal of low production cost of high-purity resin products.

[0028] 3. The present invention aims to solve the problem that the washing time is long and the amount of deionized water is large due to the insufficient contact between the resin solution and the deionized water. By increasing the contact area and mass transfer efficiency between the resin solution and the deionized water, the washing time and water consumption are reduced.

[0029] 4. The present invention can be widely used in the purification of resins required in the fields of electronic material manufacturing, electronic material packaging, food processing, food packaging, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of the present invention.

[0031] Figure 2 Front view of the liquid-liquid mass transfer separation device and the oil-water separation device.

[0032] Figure 3 It is a top view of the liquid-liquid mass transfer separation device and the oil-water separation device. DETAILED DESCRIPTION

[0033] In order to facilitate the understanding of the present invention, the present invention will be fully described below with reference to the relevant drawings. The drawings show the preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0034] It should be noted that when an element is referred to as being "disposed" on another element, it may be directly connected to the other element or there may be an intermediate element. When an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to be limited to the present invention.

[0036] The unit of the anion and cation content in the device and method for removing anions and cations from a resin solution described in the present invention is μg / g, and an inductively coupled plasma mass spectrometer (ICP-MS) is used to detect metal ions in the sample. The anion test uses a potentiometric titration method to detect the anions in the sample.

[0037] The cation and anion removal rates described in the following examples are as follows:

[0038] Combined with the attached pictures Figure 1 , Figure 2 and Figure 3, a device for removing anions and cations from a resin solution, comprising a resin solution preheating device 2 and a deionized water preheating device 4, a primary feed mixing device 5, a secondary feed mixing device 6 and a tertiary feed mixing device 15, a primary liquid-liquid mass transfer separation device 9, a secondary liquid-liquid mass transfer separation device 13 and a tertiary liquid-liquid mass transfer separation device 17, a primary oil-water separation device 8, a secondary oil-water separation device 14 and a tertiary oil-water separation device 18, a qualified product solution tank 21, and a wastewater treatment device 11; the resin solution preheating device 2 is respectively connected to a pipeline of a resin solution to be treated and the primary feed mixing device 5 and the tertiary feed mixing device 15, the deionized water preheating device 4 is respectively connected to a deionized water pipeline 3 and the primary feed mixing device 5; the primary feed mixing device 5 is respectively connected to the primary liquid-liquid mass transfer separation device 9 and the resin solution The preheating device 2 is connected to the deionized water preheating device 4, the secondary feeding mixing device 6 is respectively connected to the primary purification resin solution 7 pipeline and the secondary liquid-liquid mass transfer separation device 13 and the tertiary external drainage 20, the tertiary feeding mixing device 15 is respectively connected to the resin solution preheating device 2, the tertiary liquid-liquid mass transfer separation device 17 and the secondary purification resin solution 16 pipeline and the tertiary purification resin solution 19; the primary liquid-liquid mass transfer separation device 9 is connected to the primary oil-water separation device 8, the secondary liquid-liquid mass transfer separation device 13 is connected to the secondary oil-water separation device 14, and the tertiary liquid-liquid mass transfer separation device 17 is respectively connected to the tertiary oil-water separation device 18; the qualified product solution tank 21 is connected to the tertiary purification resin solution 19 pipeline; the wastewater treatment device is respectively connected to the primary external drainage 10 and the secondary external drainage 12.

[0039] The primary, secondary and tertiary liquid-liquid mass transfer separation devices all include a cylinder 23, fiber filaments 24, a feed port 22, and a cylinder flange 25; the primary, secondary and tertiary oil-water separation devices all include an oil-water separation tank 33, a level meter 26, a thermometer 27, a pressure gauge 28, a purified resin liquid outlet 29, a resin purified liquid spare port 30, a wastewater discharge port 31, and a wastewater discharge spare port 32.

[0040] The material of the cylinder 23 in the primary, secondary and tertiary liquid-liquid mass transfer separation devices is stainless steel; the material of the fiber filaments 24 is stainless steel or polymer material, and the fiber filament diameter is 25μm~1000μm, preferably 100μm~500μm.

[0041] After the resin solution to be purified is preheated, it is subjected to three-stage mass transfer-separation and three-stage oil-water separation treatment to obtain the purified resin.

[0042] Example 1 Using a toluene solution of polyphenylene ether resin as raw material, the copper ion content in the resin solution is 783 μg / g. After being treated by a device and method for removing anions and cations from a resin solution according to the present invention, the material is heated to 40°C, the fiber diameter of the liquid-liquid mass transfer separation device is 25 μm, the material is 316L, the oil-water separation tank interface is controlled at 10%, and sampling and analysis from the purified resin solution tank show that the copper ion content is 1 μg / g and the target ion removal rate is 99.9%.

[0043] Example 2 Using a toluene solution of polyphenylene ether resin as raw material, the copper ion content in the resin solution is 921 μg / g. After being treated by a device and method for removing anions and cations from a resin solution according to the present invention, the material is heated to 90°C, the fiber diameter of the liquid-liquid mass transfer separation device is 100 μm, the material is 316L, the oil-water separation tank interface is controlled at 50%, and sampling and analysis from the purified resin solution tank show that the copper ion content is 3 μg / g and the target ion removal rate is 99.7%.

[0044] Example 3 Using a toluene solution of polyphenylene ether resin as raw material, the copper ion content in the resin solution is 1023 μg / g. After being treated by a device and method for removing anions and cations from a resin solution according to the present invention, the material is heated to 60°C, the fiber diameter of the liquid-liquid mass transfer separation device is 300 μm, the material is 316L, the interface of the oil-water separation tank is controlled at 80%, and sampling and analysis from the purified resin solution tank show that the copper ion content is 2 μg / g and the target ion removal rate is 99.8%.

[0045] Example 4 Using glycidyl ether epoxy resin solution as raw material, the chloride ion content in the resin solution is 876μg / g. After being treated by a device and method for removing anions and cations from a resin solution described in the present invention, the material is heated to 30°C, the fiber diameter of the liquid-liquid mass transfer separation device is 500μm, the material is 316L, the oil-water separation tank interface is controlled at 10%, and sampling and analysis from the purified resin solution tank show that the chloride ion content is 4μg / g and the target ion removal rate is 99.5%.

[0046] Example 5 Using glycidyl ether epoxy resin solution as raw material, the chloride ion content in the resin solution is 983μg / g. After being treated by a device and method for removing anions and cations from a resin solution described in the present invention, the material is heated to 70°C, the fiber diameter of the liquid-liquid mass transfer separation device is 1000μm, the material is PTFE, the oil-water separation tank interface is controlled at 50%, and sampling and analysis from the purified resin solution tank show that the chloride ion content is 4μg / g and the target ion removal rate is 99.5%.

[0047] Example 6 Using glycidyl ether epoxy resin solution as raw material, the chloride ion content in the resin solution is 760 μg / g. After being treated by the device and method for removing anions and cations from the resin solution described in the present invention, the material is heated to 60°C, the fiber diameter of the liquid-liquid mass transfer separation device is 800 μm, the material is PTFE, the oil-water separation tank interface is controlled at 30%, and sampling and analysis from the purified resin solution tank show that the chloride ion content is 4 μg / g and the target ion removal rate is 99.5%.

[0048] Example 7 Using glycidyl ether epoxy resin solution as raw material, the chloride ion content in the resin solution is 801 μg / g. After being treated by the device and method for removing anions and cations from the resin solution described in the present invention, the material is heated to 60°C, the fiber diameter of the liquid-liquid mass transfer separation device is 500 μm, the material is PTFE, the oil-water separation tank interface is controlled at 20%, and sampling and analysis from the purified resin solution tank show that the chloride ion content is 3 μg / g and the target ion removal rate is 99.6%.

[0049] Example 8 Using glycidyl ether epoxy resin solution as raw material, the chloride ion content in the resin solution is 1203 μg / g. After being treated by a device and method for removing anions and cations from a resin solution described in the present invention, the material is heated to 60°C, the fiber diameter of the liquid-liquid mass transfer separation device is 300 μm, the material is PTFE, the oil-water separation tank interface is controlled at 50%, and sampling and analysis from the purified resin solution tank show that the chloride ion content is 4 μg / g and the target ion removal rate is 99.7%.

[0050] Example 9 Using polyphenylene ether resin solution as raw material, the copper ion content in the resin solution is 1358 μg / g. After being treated by a device and method for removing anions and cations from a resin solution according to the present invention, the material is heated to 60°C, the fiber diameter of the liquid-liquid mass transfer separation device is 200 μm, the material is PTFE, the oil-water separation tank interface is controlled at 10%, and sampling and analysis from the purified resin solution tank show that the copper ion content is 4 μg / g and the target ion removal rate is 99.7%.

[0051] The above-mentioned embodiment only expresses one implementation mode of the present invention, and its description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. A device for removing anions and cations from a resin solution, comprising a resin solution preheating device (2) and a deionized water preheating device (4), a primary feed mixing device (5), a secondary feed mixing device (6) and a tertiary feed mixing device (15), a primary liquid-liquid mass transfer separation device (9), a secondary liquid-liquid mass transfer separation device (13) and a tertiary liquid-liquid mass transfer separation device (17), a primary oil-water separation device (8), a secondary oil-water separation device (14) and a tertiary oil-water separation device (18), a qualified product solution tank (21), and a wastewater treatment device (11); the resin solution preheating device (2) is respectively connected to a pipeline of a resin solution to be treated (1) and the primary feed mixing device (5) and the tertiary feed mixing device (15); the deionized water preheating device (4) is respectively connected to a deionized water (3) pipeline and the primary feed mixing device (5); the primary feed mixing device (5) is respectively connected to the primary liquid-liquid mass transfer separation device (9) and the resin The solution preheating device (2) is connected to the deionized water preheating device (4); the secondary feed mixing device (6) is respectively connected to the primary purification resin solution (7) pipeline and the secondary liquid-liquid mass transfer separation device (13) and the tertiary external drainage (20); the tertiary feed mixing device (15) is respectively connected to the resin solution preheating device (2), the tertiary liquid-liquid mass transfer separation device (17) and the secondary purification resin solution (16) pipeline and the tertiary purification resin solution (19); the primary liquid-liquid mass transfer separation device (9) is connected to the primary oil-water separation device (8); the secondary liquid-liquid mass transfer separation device (13) is connected to the secondary oil-water separation device (14); the tertiary liquid-liquid mass transfer separation device (17) is respectively connected to the tertiary oil-water separation device (18); the qualified product solution tank (21) is connected to the tertiary purification resin solution (19) pipeline; the wastewater treatment device is respectively connected to the primary external drainage (10) and the secondary external drainage (12).

2. The device for removing anions and cations from a resin solution according to claim 1, characterized in that The liquid-liquid mass transfer separation device comprises a barrel (23), fiber filaments (24), a feed inlet (22), and a barrel flange (25).

3. The device for removing anions and cations from a resin solution according to claim 1, characterized in that The oil-water separation device comprises an oil-water separation tank (33), an interface meter (26), a thermometer (27), a pressure gauge (28), a purified resin liquid outlet (29), a resin purified liquid spare outlet (30), a wastewater discharge outlet (31), and a wastewater discharge spare outlet (32).

4. The device for removing anions and cations from a resin solution according to claim 2, characterized in that The material of the cylinder (23) in the liquid-liquid mass transfer separation device is stainless steel; the material of the fiber filaments (24) is stainless steel or a polymer material, and the diameter of the fiber filaments is 25 μm to 1000 μm, preferably 100 μm to 500 μm.

5. A method for removing anions and cations from a resin solution, characterized in that: The following steps are involved: (1) The resin solution and deionized water to be treated with a certain concentration are heated to a certain temperature by a resin solution preheating device and a deionized water preheating device respectively, and then the two streams of materials are fully mixed by a primary feed mixer, and the mixed materials are transported to a primary liquid-liquid mass transfer separation device through a pipeline; (2) The material is subjected to mass transfer and separation in the primary liquid-liquid mass transfer separation device, and the anions and cations in the resin solution are quickly transferred to water, and then enter the primary oil-water separation device; the oil-water mixture entering the primary oil-water separation device is further settled and stratified; the oil-water interface is controlled by the interface meter, so that the primary purified resin solution is discharged from the top of the storage tank and enters the secondary feed mixing device, and the primary external drainage containing anions and cations is discharged from the bottom of the tank and enters the wastewater treatment device; (3) The first-stage purified resin solution and the third-stage external drainage enter the second-stage liquid-liquid mass transfer separation device through the feed second-stage mixing device. The oil-water mixture undergoes a mass transfer-separation process in the second-stage liquid-liquid mass transfer separation device to further remove anions and cations in the resin solution, and then enters the second-stage oil-water separation device; The oil-water mixture entering the secondary oil-water separation device is further settled and stratified; the oil-water interface is controlled by an interface meter to achieve the discharge of the secondary purification resin solution from the top of the storage tank and enter the tertiary feed mixing device, and the secondary external drainage containing anions and cations is discharged from the bottom of the tank and enters the wastewater treatment device; (4) The secondary purification resin solution and deionized water enter the tertiary liquid-liquid mass transfer separation device through the tertiary feed mixing device. The oil-water mixture undergoes a mass transfer-separation process in the tertiary liquid-liquid mass transfer separation device to further remove the anions and cations in the resin solution, and then enters the tertiary oil-water separation device. The oil-water mixture entering the tertiary oil-water separation device is further settled and stratified. The oil-water interface is controlled by an interface level meter to discharge the tertiary purification resin solution from the top of the storage tank. After testing, the anion and cation content of the tertiary purification resin solution meets the standard and enters the qualified product tank. The tertiary external drainage is discharged from the bottom of the tank and enters the secondary feed mixing device, thereby achieving the goal of reducing the amount of deionized water used. (5) If the anion and cation content of the tertiary purification resin solution does not meet the standard after testing, it will enter the tertiary feed mixer and repeat the steps until the product is qualified.

6. The method for removing anions and cations from a resin solution according to claim 5, characterized in that The heating medium of the preheating device in step (1) is one of hot water, heat transfer oil, steam or electric heating, preferably hot water or heat transfer oil, and the heating temperature is controlled at 20°C to 90°C, preferably 40°C to 70°C.

7. The method for removing anions and cations from a resin solution according to claim 5, characterized in that In step (1), the volume ratio of deionized water to the resin solution to be treated is (0.3-5):1, preferably (1-3):

1.

8. The method for removing anions and cations from a resin solution according to claim 5, characterized in that In step (2), step (3) and step (4), the interface position in the oil-water separation tank is controlled at 10% to 80%, preferably 20% to 50%.

9. The method for removing anions and cations from a resin solution according to claim 5, characterized in that The mass concentration of the resin solution to be treated is 3% to 50%, preferably 5% to 20%.

10. The method for removing anions and cations from a resin solution according to claim 5, characterized in that The resin to be treated is polyphenylene ether resin, glycidyl ether epoxy resin, etc.

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