Vanadium electrolyte purification device

Abstract

The utility model discloses a vanadium electrolyte purification device, the purification device combines from electrolyte with the extraction agent and diluent and can extract, the water phase of reverse extraction obtains again through the reduced pressure distillation, and the residual reverse extraction solvent distillation comes out, and finally again through the adsorption unit adsorbs trace residual solvent, and the purification process is simple and efficient, and the obtained vanadium electrolyte is high in purity.

Description

Technical Field

[0001] This utility model relates to the field of vanadium electrolyte preparation technology, specifically to a vanadium electrolyte purification device. Background Technology

[0002] Vanadium electrolyte is one of the key materials in vanadium redox flow batteries, and its purity greatly affects its performance. Current vanadium electrolyte production technology mainly uses high-purity vanadium pentoxide as raw material, producing it through reduction followed by electrolysis. The production of high-purity vanadium pentoxide involves complex purification processes, long procedures, and high energy consumption, leading to high production costs. Vanadium pentoxide accounts for more than 80% of the electrolyte cost. To reduce the production cost of vanadium electrolyte and enhance the competitiveness of vanadium batteries, the production process is typically optimized. This usually involves using low-purity vanadium materials such as vanadium-containing leachate, ammonium vanadate, and low-purity vanadium pentoxide as raw materials, which are then purified to obtain the vanadium electrolyte.

[0003] Existing short-process vanadium electrolyte preparation typically involves extracting vanadium active materials using organic compounds. However, the extractants and diluents used in the extraction process are generally high-boiling-point substances. For example, P2O4 can form a stable complex with vanadium. If this is combined with refining methods such as distillation, it is difficult to completely remove the high-boiling-point substances to achieve the goal of high-purity vanadium electrolyte. This results in poor electrolyte performance and corrosion of the fuel cell stack materials, which can affect the long-term use of the system.

[0004] Patent document CN215924656U discloses a method for removing organic residues using resin adsorption. However, the adsorption capacity of resin is limited, requiring multiple adsorption stages, resulting in low efficiency. Patent document CN115020757A discloses a method for removing organic matter from vanadium electrolyte using electrodialysis. Electrodialysis involves electrochemically polarizing the extractant to form anionic groups, which then move towards the positive electrode through a membrane, achieving separation. However, electrodialysis can only remove ionic organic matter, exhibiting significant limitations.

[0005] In summary, it is necessary to design a vanadium electrolyte purification device to improve purification effect and efficiency. Utility Model Content

[0006] The purpose of this invention is to provide a vanadium electrolyte purification device to improve purification effect and efficiency.

[0007] To achieve the above objectives, the solution of this utility model is as follows: A vanadium electrolyte purification device includes an extraction unit connected to a feed pipe, an upper part of the extraction unit connected to a back-extraction unit, a lower part of the back-extraction unit connected to a distillation unit, a bottom part of the distillation unit connected to an adsorption unit, a lower part of the adsorption unit connected to a pressure filtration unit, and a liquid phase output end of the pressure filtration unit connected to a storage tank. The extraction unit is used to extract vanadium electrolyte to obtain a vanadium-containing organic phase, and the back-extraction unit is used to back-extract the vanadium-containing organic phase to obtain a vanadium-containing electrolyte.

[0008] Furthermore, the upper part of the distillation unit is sequentially connected to a vacuum unit and a storage tank.

[0009] Furthermore, the second storage tank is connected to the upper part of the reverse extraction unit.

[0010] Furthermore, the upper part of the back-extraction unit is connected to a storage tank three.

[0011] Furthermore, the adsorption unit is equipped with a steam heating pipeline.

[0012] Furthermore, at least one of the extraction unit, back-extraction unit, distillation unit, and adsorption unit is provided with a stirring mechanism.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: The purification device described in this invention, combined with a back-extraction unit, can extract the extractant and diluent from the electrolyte. The aqueous phase obtained from the back-extraction is then distilled off by vacuum distillation to remove the residual back-extraction solvent. Finally, the residual solvent is adsorbed by an adsorption unit. The purification process is simple and efficient, and the resulting vanadium electrolyte has high purity. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall vanadium electrolyte purification device provided by this utility model.

[0015] The attached figures are labeled as follows: A1, Adsorption Unit; D1, Distillation Unit; E1, Extraction Unit; E2, Back-extraction Unit; F1, Filtration Unit; L1, Feed Pipe 1; L2, Feed Pipe 2; L3, Feed Pipe 3; L4, Feed Pipe 4; L5, Circulation Pipe; P1, Pump 1; P2, Pump 2; P3, Pump 3; P4, Pump 4; P5, Pump 5; P6, Pump 6; S1, Storage Tank 1; S2, Storage Tank 2; S3, Storage Tank 3; V1, Vacuum Unit; 10, Extractant Feed Pipe; 20, Back-extraction Agent Feed Pipe. Detailed Implementation

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

[0017] It should be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0018] It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "joining," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0019] In one embodiment, such as Figure 1 As shown, a vanadium electrolyte purification device is proposed, including an extraction unit E1 connected to a feed pipe L1, a back-extraction unit E2 connected to the upper part of the extraction unit E1 by a feed pipe L2, a distillation unit D1 connected to the lower part of the back-extraction unit E2 by a feed pipe L3, an adsorption unit A1 connected to the bottom of the distillation unit D1 by a feed pipe L4, a pressure filtration unit F1 connected to the lower part of the adsorption unit A1, and a storage tank S1 connected to the liquid phase output end of the pressure filtration unit F1. The extraction unit E1 is used to extract the vanadium electrolyte to obtain a vanadium-containing organic phase, and the back-extraction unit E2 is used to back-extract the vanadium-containing organic phase to obtain a vanadium-containing electrolyte.

[0020] In the above embodiments, the purification device, combined with the back-extraction unit, can extract the extractant and diluent from the electrolyte. The aqueous phase obtained by back-extraction is then distilled off by vacuum distillation to remove the residual organic solvent. Finally, the residual solvent is adsorbed by the adsorption unit, and solid-liquid separation is performed based on the pressure filtration unit to obtain the finally purified electrolyte. The purification process is simple and efficient, and the obtained vanadium electrolyte has high purity.

[0021] In the above embodiment, the extraction unit E1 is equipped with an extractant feed pipe 10 at its upper part for adding extractant and diluent, such as the common P2O4 plasma extractant, and white oil as a diluent. The extraction unit E1 can dissolve the vanadium active material in the extractant, which then separates from the upper layer as an organic phase and enters the back-extraction unit E2. The back-extraction unit E2 is equipped with a back-extraction agent feed pipe 20 at its upper part for adding back-extraction agent to extract the high-boiling-point organic phase, thereby precipitating the vanadium active material in aqueous phase.

[0022] In a preferred embodiment, the back-extraction agent can be a common low-boiling-point reagent such as dichloromethane or petroleum ether, which can dissolve the high-boiling-point reagents in the extraction process and precipitate vanadium active substances in the aqueous phase.

[0023] In the above embodiments, the adsorbent can be selected from common adsorbents used for adsorbing organic substances, such as activated carbon with high porosity, and strong acid-resistant silica-based organic adsorbents with high specific surface area and selective adsorption. It is understood that the adsorbent can be regenerated and reused after adsorption, thus effectively reducing raw material consumption and costs in industrial production.

[0024] In the above embodiments, the filter press unit F1 can be a commonly used filter press, a solid-liquid separation mechanical device that uses a filter medium to apply a certain pressure, causing the liquid to permeate out. During operation, the adsorbent material containing organic matter is retained and then filtered to obtain a purified electrolyte.

[0025] In a preferred embodiment, the upper part of the distillation unit D1 is sequentially connected to the vacuum unit V1 and the storage tank S2 to improve the distillation efficiency and effect of the distillation unit D1. More preferably, the storage tank S2 is provided with a circulation pipe L5 connected to the upper part of the back-extraction unit E2 to recover the low-boiling-point organic phase for further back-extraction.

[0026] In a preferred embodiment, the upper part of the back-extraction unit E2 is connected to a storage tank S3 for recovering the extracted organic phase and using it for post-processing separation and recovery. By recovering and reusing the organic phase from the back-extraction, the amount of reagents used in the entire purification process is reduced. Combined with the aforementioned regeneration of the adsorbent, the entire purification process requires almost no new chemical reagents, significantly reducing the wastewater treatment pressure caused by the purification process and improving economic efficiency.

[0027] In a preferred embodiment, the adsorption unit A1 is equipped with a steam heating pipeline to enhance the adsorption effect, thereby obtaining a high-purity vanadium electrolyte after passing through a pressure filtration unit.

[0028] In a preferred embodiment, the extraction unit E1, the back-extraction unit E2, the distillation unit D1, and the adsorption unit A1 are all equipped with stirring mechanisms to improve the processing efficiency of each unit.

[0029] In a preferred embodiment, to improve material transfer efficiency, pumps P1, P2, P3, and P6 are respectively installed on the feed pipe L2, feed pipe L3, feed pipe L4, and circulation pipe. Pump P4 connects the adsorption unit A1 to the filter press F1, and pump P5 connects the back-extraction unit E2 to the storage tank S3.

[0030] It is understood that the specifications and materials used in any of the above units can be selected according to the functional requirements of the unit and the physical and chemical properties of the materials. Commonly used instruments, meters or valves can also be selected or added according to the operational requirements. All of the above are within the design scope of this solution and will not be elaborated here.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A vanadium electrolyte purification device, characterized in that, The system includes an extraction unit (E1) connected to a feed pipe (L1), an upper part of which is connected to a back-extraction unit (E2), a lower part of which is connected to a distillation unit (D1), a bottom part of which is connected to an adsorption unit (A1), a lower part of which is connected to a pressure filtration unit (F1), and a liquid phase output end of the pressure filtration unit (F1) connected to a storage tank (S1). The extraction unit (E1) is used to extract vanadium electrolyte to obtain a vanadium-containing organic phase, and the back-extraction unit (E2) is used to back-extract the vanadium-containing organic phase to obtain a vanadium-containing electrolyte.

2. The vanadium electrolyte purification apparatus according to claim 1, characterized in that, The upper part of the distillation unit (D1) is connected to the vacuum unit (V1) and the storage tank (S2) in sequence.

3. The vanadium electrolyte purification apparatus according to claim 2, characterized in that, The storage tank (S2) is connected to the upper part of the back-extraction unit (E2).

4. The vanadium electrolyte purification apparatus according to claim 1, characterized in that, The upper part of the back-extraction unit (E2) is connected to storage tank three (S3).

5. The vanadium electrolyte purification apparatus according to claim 1, characterized in that, The adsorption unit (A1) is equipped with a steam heating pipeline.

6. The vanadium electrolyte purification apparatus according to any one of claims 1-5, characterized in that, At least one of the extraction unit (E1), back-extraction unit (E2), distillation unit (D1), and adsorption unit (A1) is equipped with a stirring mechanism.

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