2, 5-furandicarboxylic acid purification device and preparation device

Abstract

The utility model discloses a 2, 5-furandicarboxylic acid purification device and a preparation device, the purification device comprises a purification chamber, and a nanofiltration membrane is arranged in the purification chamber; the purification chamber on one side of the nanofiltration membrane is provided with a feeding hole through which a 2, 5-furandicarboxylic acid crude product solution enters the purification chamber, and the pure product chamber on the other side of the nanofiltration membrane is provided with a discharging hole (22) through which the filtered 2, 5-furandicarboxylic acid solution is discharged out of the pure product chamber. Through the design, 2, 5-furandicarboxylic acid can be efficiently and conveniently purified at low cost in a flowing system, and the method has the advantages of simple process, high operability, high yield, no introduction of additional metal impurities and the like.

Description

TECHNICAL FIELD

[0001] The utility model relates to 2, 5 - furan dicarboxylic acid (FDCA) purification technical field, specifically in 2, 5 - furan dicarboxylic acid purification device and preparation device. BACKGROUND

[0002] 2, 5 - furan dicarboxylic acid (2, 5 - Furandicarboxylic acid, abbreviated as FDCA) can be used as a comonomer to modify other polymers, improving the performance of the final product, such as enhancing heat resistance, improving mechanical strength and chemical resistance. 2, 5 - furan dicarboxylic acid is a key raw material for producing polyethylene furandicarboxylate (PEF); PEF is a high-performance bio-based polyester material, which has better barrier property, heat resistance and mechanical property than traditional petroleum-based PET (polyethylene terephthalate), and is an ideal candidate material for the next generation of beverage bottles, packaging materials and textile fibers.

[0003] The higher the purity of 2, 5 - furan dicarboxylic acid, the better the performance of the prepared PEF material, especially in terms of transparency, mechanical strength and barrier property. However, the inventors found that the existing purification methods of 2, 5 - furan dicarboxylic acid have problems such as high energy consumption, complicated steps, high requirements for equipment, etc. For example, in the method of purifying FDCA with high-boiling-point solvents (such as DMF, DMSO, etc.), there are problems of complex separation and difficulty in recycling the solvent. In the method of using esterification and acetal reaction of FDCA combined with distillation and hydrolysis to improve the purity of FDCA, there are problems of complicated steps, high requirements for equipment and difficulty in realizing continuous purification. In the method of using ethylene glycol ether and water to recrystallize and purify FDCA, there is a problem of residual solvent in FDCA, which is not conducive to the downstream polymerization process. In the method of treating FDCA with acetic acid solution at 140 ～ 200℃ and cooling to obtain pure FDCA, there is a problem of high requirement for corrosion-resistant equipment. In the method of purifying FDCA crude product by using the difference in solubility of FDCA and impurities in low-boiling-point solvents, there is a problem of using a large amount of organic solvents. In the method of dissolving FDCA in alkaline solution first, then purifying and acidifying to obtain high-purity FDCA, there are problems of generating a large amount of wastewater and waste salt and introducing metal ions, which is not suitable for large-scale preparation. At present, all the above-mentioned purification methods cannot realize continuous purification of 2, 5 - furan dicarboxylic acid in a flow system.

[0004] Therefore, how to efficiently and conveniently purify 2, 5 - furan dicarboxylic acid in a flow system at low cost without introducing additional metal impurities is a technical problem to be solved at present. UTILITY MODEL CONTENT

[0005] Therefore, the 2,5-furan dicarboxylic acid purification device and preparation device have the advantages that the 2,5-furan dicarboxylic acid can be purified under a flow system in a high efficiency, convenient and low cost manner, and no additional metal impurities are introduced.

[0006] To solve the above technical problems, the technical scheme of the utility model is as follows:

[0007] A 2,5-furan dicarboxylic acid purification device, comprising a purification chamber, wherein a nanofiltration membrane is arranged in the purification chamber; the purification chamber on one side of the nanofiltration membrane is provided with a feed inlet for 2,5-furan dicarboxylic acid crude solution to enter the purification chamber; and the purification chamber on the other side of the nanofiltration membrane (3) is provided with a discharge outlet for filtered 2,5-furan dicarboxylic acid solution to be discharged out of the purification chamber.

[0008] By adopting the above technical scheme, in the purification process of 2,5-furan dicarboxylic acid, 2,5-furan dicarboxylic acid crude solution enters the purification chamber through the feed inlet, and the filtered 2,5-furan dicarboxylic acid solution can be discharged out of the purification chamber through the discharge outlet, so that the 2,5-furan dicarboxylic acid can be purified under a flow system in a high efficiency, convenient and low cost manner, and no additional metal impurities are introduced.

[0009] Further, a pressure regulating device is arranged, which is used to adjust the pressure of the 2,5-furan dicarboxylic acid crude solution on the side of the nanofiltration membrane close to the feed inlet.

[0010] By adopting the above technical scheme, the pressure of the 2,5-furan dicarboxylic acid crude solution on the side of the feed inlet is adjusted by the pressure regulating device, so that the nanofiltration membrane can operate in a better working state within a proper filtration pressure range, the filtration efficiency is improved, and the nanofiltration membrane is prevented from being damaged due to excessive pressure; and the pressure regulating device can maintain and adjust the pressure difference of the solutions on both sides of the nanofiltration membrane, so as to ensure the continuity and stability of the filtration process.

[0011] Further, the purification chamber is further provided with an impurity discharge outlet, which is located on the side of the nanofiltration membrane close to the feed inlet.

[0012] By adopting the above technical scheme, the impurity discharge outlet can discharge the part of the 2,5-furan dicarboxylic acid crude solution that does not pass through the nanofiltration membrane out of the purification chamber, so as to ensure the continuous flow of the 2,5-furan dicarboxylic acid crude solution on the side of the discharge outlet.

[0013] Further, a first circulation pipeline is arranged, one end of the first circulation pipeline is communicated with the impurity discharge outlet, and the other end of the first circulation pipeline is communicated with the feed inlet.

[0014] By adopting the technical scheme, the first circulating pipeline can realize multiple circulation filtering of the 2,5-furan dicarboxylic acid crude solution, and improve the extraction rate of 2,5-furan dicarboxylic acid in the 2,5-furan dicarboxylic acid crude solution.

[0015] Further, the first circulating pipeline is provided with a power pump for driving the solution inside to flow from the impurity discharge port to the feeding port.

[0016] By adopting the technical scheme, the power pump can promote the circulation of the 2,5-furan dicarboxylic acid crude solution through the first circulating pipeline, and improve the filtering efficiency.

[0017] Further, the second circulating pipeline is further provided with a second circulating pipeline, one end of the second circulating pipeline is communicated with the discharge port, and the other end is communicated with the feeding port.

[0018] By adopting the technical scheme, the second circulating pipeline can filter the 2,5-furan dicarboxylic acid solution filtered for the first time again, and improve the purity of the 2,5-furan dicarboxylic acid solution obtained finally.

[0019] Further, the nanofiltration membrane comprises multiple-stage nanofiltration membranes arranged in sequence from the feeding port to the discharge port; the molecular weight cut-off of the multiple-stage nanofiltration membranes decreases in sequence from the feeding port to the discharge port.

[0020] By adopting the technical scheme, the multiple-stage nanofiltration membranes can extract the 2,5-furan dicarboxylic acid crude solution step by step, and improve the purity of the 2,5-furan dicarboxylic acid solution filtered.

[0021] Further, the nanofiltration membrane comprises a first-stage nanofiltration membrane, a second-stage nanofiltration membrane and a third-stage nanofiltration membrane arranged in sequence from the feeding port to the discharge port; the molecular weight cut-off of the first-stage nanofiltration membrane is 800-1000 Dalton, the molecular weight cut-off of the second-stage nanofiltration membrane is 500-800 Dalton, and the molecular weight cut-off of the third-stage nanofiltration membrane is 300-500 Dalton.

[0022] By adopting the technical scheme, the molecular weight cut-off of the third-stage nanofiltration membrane gradually decreases, which can realize step-by-step separation of solutes with different molecular weights, more accurately control the components of the permeate solution, and improve the filtering precision; the first-stage nanofiltration membrane can remove larger particles and high-molecular-weight impurities, and reduce the risk of pollution of the subsequent-stage nanofiltration membranes; thus, the pollution load of the subsequent-stage nanofiltration membranes can be reduced, the service life of the subsequent-stage nanofiltration membranes can be prolonged, and the cleaning and replacement frequency can be reduced.

[0023] Further, an impurity discharge port is arranged between the adjacent two-stage nanofiltration membranes for discharging the impurities out of the purification chamber (1).

[0024] By adopting the technical scheme, the impurity discharge port between the two adjacent nanofiltration membranes is arranged, so that the continuous flow of the 2,5-furan dicarboxylic acid crude product solution which is not filtered can be realized.

[0025] Further, the purification chamber comprises a crude product chamber and a pure product chamber, and the crude product chamber and the pure product chamber are separated by the nanofiltration membrane; the feed port is arranged on the crude product chamber, and the discharge port is arranged on the pure product chamber.

[0026] By adopting the technical scheme, the 2,5-furan dicarboxylic acid purification device has simple structure, is easy to realize, and has low manufacturing cost.

[0027] A 2,5-furan dicarboxylic acid preparation device comprises the 2,5-furan dicarboxylic acid purification device, and is characterized in that the 2,5-furan dicarboxylic acid preparation device further comprises a reaction chamber, the reaction chamber is provided with an HMF inlet through which a 5-hydroxymethylfurfural solution flows into the reaction chamber, and the feed port of the purification chamber is in communication with the reaction chamber so that the solution in the reaction chamber flows into the purification chamber.

[0028] By adopting the technical scheme, the 2,5-furan dicarboxylic acid preparation device communicates the feed ports of the reaction chamber and the purification chamber, can continuously provide the 2,5-furan dicarboxylic acid crude product solution for the purification chamber, and can efficiently, conveniently and at low cost prepare the 2,5-furan dicarboxylic acid with high purity under a flow system.

[0029] Further, the reaction chamber is an electrochemical reaction chamber.

[0030] In summary, the 2,5-furan dicarboxylic acid purification device and the preparation device provided by the utility model set the nanofiltration membrane in the purification chamber to filter the impurities in the 2,5-furan dicarboxylic acid crude product, simultaneously use the pressure regulating device to regulate the pressure in the crude product chamber, so that most of the 2,5-furan dicarboxylic acid can pass through the nanofiltration membrane, most of the impurities cannot pass through the nanofiltration membrane, the 2,5-furan dicarboxylic acid fine product with high purity is obtained from the discharge port, and the impurities are removed from the 2,5-furan dicarboxylic acid purification device, so that the 2,5-furan dicarboxylic acid can be efficiently, conveniently and at low cost purified under a flow system, and the utility model has the advantages of simple process, strong operability, high yield, no introduction of additional metal impurities and the like. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the specific embodiments of the utility model or the technical scheme in the prior art, the drawings needed to be used in the specific embodiments or the prior art description will be briefly introduced below, and obviously, the drawings in the following description are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating any creative labor.

[0032] Figure 1 It is the structure schematic view of 2,5-furan dicarboxylic acid purification device in the embodiment one of the utility model;

[0033] Figure 2 It is the structure schematic view of 2,5-furan dicarboxylic acid purification device in the embodiment two of the utility model;

[0034] Figure 3 It is the structure schematic view of 2,5-furan dicarboxylic acid purification device in the embodiment three of the utility model;

[0035] Figure 4 It is the structure schematic view of 2,5-furan dicarboxylic acid purification device in the embodiment four of the utility model;

[0036] Figure 5 It is the structure schematic view of 2,5-furan dicarboxylic acid preparation device in the embodiment five of the utility model.

[0037] Mark explanation: 1, purification chamber;11, crude product chamber;12, pure product chamber;21, feed inlet;22, discharge port;23, impurity discharge port;3, nanofiltration membrane;31, primary nanofiltration membrane;32, secondary nanofiltration membrane;33, tertiary nanofiltration membrane;4, pressure regulating device;5, first circulation pipeline;6, reaction chamber;7, HMF inlet;8, second circulation pipeline. DETAILED DESCRIPTION

[0038] The technical scheme of the utility model will be described below in conjunction with the drawings, obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiment. Based on the embodiment in the utility model, all other embodiments obtained by the person skilled in the art without making creative labor belong to the scope of protection of the utility model.

[0039] In the description of the utility model, it is necessary to explain that the orientation or position relation indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like is based on the orientation or position relation shown in the drawings, only for the convenience of describing the utility model and simplifying the description, and not indicating or implying that the indicated device or element must have a particular orientation, a particular orientation and operation, therefore, it cannot be understood as the limitation of the utility model. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0040] In the description of the utility model, it is necessary to explain, unless another explicit provision and limitation, the term "installation", "link", "connection" should do the broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through the intermediate medium, can be two elements inside the communication. For ordinary skilled in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to the specific circumstances.

[0041] Embodiment one

[0042] As Figure 1 The utility model discloses a 2, 5 -furan dicarboxylic acid purification device, including purification chamber 1, be equipped with the nanofiltration membrane 3 for separating the inside space of purification chamber 1 into crude product room 11 and pure product room 12 in purification chamber 1;Crude product room 11 is equipped with the feed port 21 for 2, 5 -furan dicarboxylic acid crude product solution enters the inside of purification chamber 1;Pure product room 12 is equipped with the discharge port 22 for the 2, 5 -furan dicarboxylic acid solution after filtering is discharged pure product room 12 outside.

[0043] In the purification process of 2, 5 -furan dicarboxylic acid, 2, 5 -furan dicarboxylic acid crude product solution enters the inside of purification chamber 1 through feed port 21, and the 2, 5 -furan dicarboxylic acid solution after filtering can be discharged pure product room 1 outside through discharge port 22, can efficiently and conveniently, low cost purify 2, 5 -furan dicarboxylic acid under the flow system, and does not introduce additional impurities.

[0044] In some embodiments, crude product room 11 is further connected with pressure regulating device 4, and pressure regulating device 4 is used for adjusting the pressure of 2, 5 -furan dicarboxylic acid crude product solution on the side of nanofiltration membrane 3 close to feed port 21. By so arranging, nanofiltration membrane 3 can be operated under the optimum working state in the appropriate filtration pressure range, improve the filtration efficiency, and prevent nanofiltration membrane from being damaged when the pressure is too large;And pressure regulating device 4 can maintain and adjust the solution pressure difference on both sides of nanofiltration membrane 3, ensure the continuity and stability of the filtration process. Specifically, as Figure 1 shown, pressure regulating device 4 can be located in crude product room 11. Pressure regulating device 4 can also be arranged outside purification chamber 12, for example, pressure regulating device 4 is arranged before feed port 21, that is, 2, 5 -furan dicarboxylic acid crude product solution entering crude product room 11 is pressurized.

[0045] Specifically, pressure regulating device 4 can include a gas guide channel in communication with crude product room 11, and a pressure controller arranged on the gas guide channel for adjusting the pressure in crude product room 11. The pressure range of the pressure controller is 0.3-3.0 MPa;Preferably, the pressure range of the pressure controller is 0.7-3.0 MPa.

[0046] In some embodiments, the crude product chamber 11 is also provided with an impurity outlet 23, which allows the portion of the crude 2,5-furandicarboxylic acid solution that has not permeated through the nanofiltration membrane 3 to be discharged out of the crude product chamber 11, ensuring the continuous flow of the crude 2,5-furandicarboxylic acid solution on the side of the outlet 21.

[0047] When using the 2,5-furandicarboxylic acid purification device, crude 2,5-furandicarboxylic acid is placed in the crude product chamber 11 of the purification chamber 1. The pressure regulating device 4 adjusts the pressure in the crude product chamber 11 so that most of the 2,5-furandicarboxylic acid can pass through the nanofiltration membrane 3, while most of the impurities cannot pass through the nanofiltration membrane 3. Thus, the refined 2,5-furandicarboxylic acid is obtained from the outlet 22, and the impurities are removed from the 2,5-furandicarboxylic acid purification device from the impurity outlet 23.

[0048] Example 2

[0049] like Figure 2 The 2,5-furandicarboxylic acid purification device shown differs from that in Example 1 in that it further includes a first circulation pipeline 5. One end of the first circulation pipeline 5 is connected to the impurity outlet 23, and the other end is connected to the feed inlet 21. The first circulation pipeline 5 allows for further extraction of 2,5-furandicarboxylic acid from the material discharged from the impurity outlet 23, enabling multiple circulation filtration of the crude 2,5-furandicarboxylic acid solution and improving the extraction rate. Since the nanofiltration membrane 3 has limited single-pass filtration capacity, some 2,5-furandicarboxylic acid will be discharged from the impurity outlet 23 along with the impurities; therefore, the material discharged from the impurity outlet 23 can be further extracted. In some embodiments, a power pump can be additionally installed on the first circulation pipeline 5 to drive the internal solution from the impurity outlet 23 to the feed inlet 21. The power pump promotes the circulation of the crude 2,5-furandicarboxylic acid solution through the first circulation pipeline 5, which is beneficial for improving filtration efficiency.

[0050] It should be noted that in actual production, the circulation rate of the first circulation pipeline 5 and the discharge rate of the outlet 22 can be reasonably adjusted according to actual needs. For example, when the amount of crude 2,5-furandicarboxylic acid solution is large, due to the limited capacity of the crude product chamber 11, the pressure of the pressure regulating device 4 cannot completely pass the crude 2,5-furandicarboxylic acid solution through the nanofiltration membrane 3 at once. Therefore, the first circulation pipeline 5 can be used, and its circulation rate is faster than that of the outlet 22. The crude 2,5-furandicarboxylic acid solution circulates in the first circulation pipeline, allowing more of the crude 2,5-furandicarboxylic acid solution to pass through the nanofiltration membrane to obtain refined 2,5-furandicarboxylic acid, thereby improving the yield of refined product. Example 3

[0051] like Figure 3The 2,5-furan dicarboxylic acid purification device shown in the figure is different from that of the first embodiment in that the nanofiltration membrane 3 comprises a first-stage nanofiltration membrane 31, a second-stage nanofiltration membrane 32 and a third-stage nanofiltration membrane 33 arranged in sequence from the crude product chamber 11 to the pure product chamber 12. The multi-stage nanofiltration membrane can perform step-by-step extraction on the 2,5-furan dicarboxylic acid crude product solution, which is conducive to improving the purity of the 2,5-furan dicarboxylic acid solution obtained by filtration. In the direction from the crude product chamber 11 to the pure product chamber 12, the molecular weight cut-off of the multi-stage nanofiltration membrane decreases in sequence. The molecular weight cut-off of the first-stage nanofiltration membrane 31 is 800-1000 Dalton, the molecular weight cut-off of the second-stage nanofiltration membrane 32 is 500-800 Dalton, and the molecular weight cut-off of the third-stage nanofiltration membrane 33 is 300-500 Dalton. The molecular weight cut-off of the multi-stage nanofiltration membrane decreases in sequence, which can realize step-by-step separation of solutes with different molecular weights and reduce the load of each layer of nanofiltration membrane. For example, the first-stage nanofiltration membrane 31 can remove larger particles and high-molecular-weight impurities, which can reduce the load of subsequent levels of nanofiltration membrane, prolong the service life of subsequent levels of nanofiltration membrane, and reduce the frequency of cleaning and replacement.

[0052] In some embodiments, impurity discharge ports 23 for discharging impurities out of the purification chamber (1) are arranged between any two adjacent nanofiltration membranes 3. The arrangement of the impurity discharge ports 23 facilitates the continuous flow of the 2,5-furan dicarboxylic acid crude product solution that has not been filtered.

[0053] It should be noted that, Figure 1 - Figure 3 The figure shown is only one embodiment of the nanofiltration membrane 3. In fact, as long as the arrangement of the nanofiltration membrane 3 for 2,5-furan dicarboxylic acid is allowed in the embodiments of the present application, for example, the nanofiltration membrane 3 can also be arranged vertically. The multi-stage nanofiltration membrane 3 can be arranged in one purification chamber 1 or in different purification chambers 1, and the number of stages of the nanofiltration membrane 3 is not limited to three stages, but can also be two stages, four stages or more stages.

[0054] Example Four

[0055] As Figure 4 The 2,5-furan dicarboxylic acid purification device shown in the figure is different from that of the first embodiment in that it further comprises a second circulation pipeline 8, one end of the second circulation pipeline 8 being communicated with the discharge port 22 and the other end being communicated with the feed port 21. The arrangement of the second circulation pipeline 8 can perform re-filtration on the 2,5-furan dicarboxylic acid solution after the initial filtration, which is conducive to improving the purity of the 2,5-furan dicarboxylic acid solution obtained finally.

[0056] Example Five

[0057] As Figure 5The 2,5-furan dicarboxylic acid preparation device shown in the embodiment comprises the 2,5-furan dicarboxylic acid purification device shown in the embodiment one and a reaction chamber 6, the reaction chamber 6 is provided with an HMF inlet 7 for flowing the 5-hydroxymethylfurfural solution into the reaction chamber 6, and the feed inlet 21 of the purification chamber 1 is communicated with the reaction chamber 6 so that the solution in the reaction chamber 6 flows into the purification chamber 1. The reaction chamber 6 is specifically an electrochemical reaction chamber for electrochemical reaction. The 2,5-furan dicarboxylic acid preparation device communicates the feed inlets of the reaction chamber and the purification chamber, can continuously provide the 2,5-furan dicarboxylic acid crude solution for the purification chamber, and can efficiently, conveniently and at low cost prepare the 2,5-furan dicarboxylic acid with high purity under a flow system.

[0058] In summary, the 2,5-furan dicarboxylic acid purification device and preparation device provided by the utility model set the nanofiltration membrane 3 in the purification chamber 1 to filter the impurities in the 2,5-furan dicarboxylic acid crude product, simultaneously adjust the pressure in the crude product chamber 11 by the pressure regulating device 4, make most of the 2,5-furan dicarboxylic acid be able to permeate the nanofiltration membrane 3, and most of the impurities cannot permeate the nanofiltration membrane 3, thereby obtaining the 2,5-furan dicarboxylic acid fine product with high purity from the discharge port 22, and removing the impurities from the impurity discharge port 23 outside the 2,5-furan dicarboxylic acid purification device, can efficiently, conveniently and at low cost purify the 2,5-furan dicarboxylic acid under a flow system, and has the advantages of simple process, strong operability, high yield, no introduction of additional metal impurities and the like.

[0059] Obviously, the above embodiments are only examples for clearly illustrating, and are not limited to the embodiments. Other different forms of changes or variations can be made on the basis of the above description for those skilled in the art. Here, all the embodiments need not and cannot be exhausted. The obvious changes or variations derived therefrom are still within the protection scope of the utility model.

Claims

1. A 2,5-furan dicarboxylic acid purification apparatus, characterized by, The purification chamber (1) is provided with a nanofiltration membrane (3), and the side of the nanofiltration membrane (3) close to the feed port (21) is provided with a feed port (21) for the 2,5-furan dicarboxylic acid crude solution to enter the purification chamber (1), and the side of the nanofiltration membrane (3) away from the feed port (21) is provided with a pure product chamber (12) provided with a discharge port (22) for the filtered 2,5-furan dicarboxylic acid solution to flow out of the pure product chamber (12).

2. The 2,5-furan dicarboxylic acid purification apparatus according to claim 1, characterized by, The purification chamber (1) is provided with a nanofiltration membrane (3), and the side of the nanofiltration membrane (3) close to the feed port (21) is provided with a feed port (21) for the 2,5-furan dicarboxylic acid crude solution to enter the purification chamber (1), and the side of the nanofiltration membrane (3) away from the feed port (21) is provided with a pure product chamber (12) provided with a discharge port (22) for the filtered 2,5-furan dicarboxylic acid solution to flow out of the pure product chamber (12).

3. The 2,5-furan dicarboxylic acid purification apparatus according to claim 1, wherein The purification chamber (1) is provided with a nanofiltration membrane (3), and the side of the nanofiltration membrane (3) close to the feed port (21) is provided with a feed port (21) for the 2,5-furan dicarboxylic acid crude solution to enter the purification chamber (1), and the side of the nanofiltration membrane (3) away from the feed port (21) is provided with a pure product chamber (12) provided with a discharge port (22) for the filtered 2,5-furan dicarboxylic acid solution to flow out of the pure product chamber (12).

4. The 2,5-furan dicarboxylic acid purification apparatus according to claim 3, wherein The purification chamber (1) is provided with a nanofiltration membrane (3), and the side of the nanofiltration membrane (3) close to the feed port (21) is provided with a feed port (21) for the 2,5-furan dicarboxylic acid crude solution to enter the purification chamber (1), and the side of the nanofiltration membrane (3) away from the feed port (21) is provided with a pure product chamber (12) provided with a discharge port (22) for the filtered 2,5-furan dicarboxylic acid solution to flow out of the pure product chamber (12).

5. The 2,5-furan dicarboxylic acid purification apparatus according to claim 1, wherein The nanofiltration membrane (3) comprises a plurality of nanofiltration membranes arranged in sequence from the feed port (21) to the discharge port (22), and the molecular weight cutoff of the plurality of nanofiltration membranes decreases in sequence from the feed port (21) to the discharge port (22).

6. The 2,5-furan dicarboxylic acid purification apparatus according to claim 1, wherein The nanofiltration membrane (3) comprises a first-stage nanofiltration membrane (31), a second-stage nanofiltration membrane (32), and a third-stage nanofiltration membrane (33) arranged in sequence from the feed port (21) to the discharge port (22), the molecular weight cutoff of the first-stage nanofiltration membrane (31) is 800-1000 Dalton, the molecular weight cutoff of the second-stage nanofiltration membrane (32) is 500-800 Dalton, and the molecular weight cutoff of the third-stage nanofiltration membrane (33) is 300-500 Dalton.

7. The 2,5-furan dicarboxylic acid purification apparatus according to claim 6, wherein Adjacent two-stage nanofiltration membranes are provided with an impurity discharge port (23) for discharging impurities out of the purification chamber (1).

8. The 2,5-furan dicarboxylic acid purification apparatus according to claim 7, wherein The purification chamber (1) comprises a crude product chamber (11) and a pure product chamber (12), and the crude product chamber (11) and the pure product chamber (12) are separated by the nanofiltration membrane (3), the feed port (21) is arranged on the crude product chamber (11), and the discharge port (22) is arranged on the pure product chamber (12).

9. The 2,5-furan dicarboxylic acid purification apparatus according to claim 1, wherein The purification chamber (1) is provided with a nanofiltration membrane (3), and the side of the nanofiltration membrane (3) close to the feed port (21) is provided with a feed port (21) for the 2,5-furan dicarboxylic acid crude solution to enter the purification chamber (1), and the side of the nanofiltration membrane (3) away from the feed port (21) is provided with a pure product chamber (12) provided with a discharge port (22) for the filtered 2,5-furan dicarboxylic acid solution to flow out of the pure product chamber (12).

10. A 2,5-furan dicarboxylic acid production apparatus comprising the 2,5-furan dicarboxylic acid purification apparatus according to any one of claims 1 to 9, characterized by, The reaction chamber (6) is an electrochemical reaction chamber.

11. The 2,5-furan dicarboxylic acid production device according to claim 10, characterized by ​

Images