Reaction device for removing oxalic acid in glyoxylic acid by using macroporous resin

Abstract

The invention relates to the field of chemical reaction equipment, and discloses a reaction device for removing oxalic acid in glyoxylic acid by using macroporous resin, which comprises a thin and tall chromatographic column, two groups of filter material precipitation plates respectively filled in the upper layer and the lower layer of the chromatographic column, and two groups of filter material precipitation plates respectively filled in the upper layer and the lower layer of the chromatographic column, the filter material precipitation plate group is formed by stacking an upper filter plate, a lower filter plate, and filter cloth I and filter cloth II with different mesh numbers up and down; the upper-layer convex ring filling bin and the lower-layer convex ring filling bin are respectively arranged at the positions close to the top end and the bottom end of the chromatographic column in a convex manner and are used for filling the two filter material precipitation plate groups; a downward-moving clamping structure corresponding to the space between the upper filter plate and the lower filter plate is arranged in the filter material precipitation plate group; according to the reaction device for removing oxalic acid in glyoxylic acid by using macroporous resin, oxalic acid can be efficiently removed, broken resin can be blocked, it is ensured that flowing-out glyoxylic acid is pure, meanwhile, key filtering parts are specially designed to be replaceable, and equipment maintenance and part replacement are facilitated.

Description

Technical Field

[0001] The present invention relates to the field of chemical reaction equipment, and specifically to a reaction device for removing oxalic acid from glyoxylic acid using macroporous resin. Background Art

[0002] In the field of chemical production, glyoxylic acid, as an important organic synthesis intermediate, is widely used in multiple industries such as pharmaceuticals, pesticides, and fragrances. However, glyoxylic acid products often contain oxalic acid impurities. The presence of oxalic acid will affect the quality of glyoxylic acid, reduce its reaction effect in subsequent applications, and may even lead to unqualified product quality. For example, in the pharmaceutical field, the impurity oxalic acid may affect the stability and safety of drugs, and in the synthesis of fragrances, it may change the odor and performance of products. Therefore, efficiently removing oxalic acid from glyoxylic acid is of great significance for improving the quality of glyoxylic acid products and meeting the application requirements of different industries.

[0003] Currently, traditional techniques for removing oxalic acid from glyoxylic acid mainly use precipitation methods, crystallization methods, etc. The precipitation method is to add a specific precipitant to the glyoxylic acid solution to form a precipitate of oxalic acid and separate it from glyoxylic acid. However, the selection and dosage of the precipitant are difficult to accurately control, which is likely to introduce new impurities and cause product loss. Although the crystallization method can separate oxalic acid to a certain extent, it requires precise control of conditions such as temperature and concentration, with complex operations, and the crystallization process is slow, resulting in low production efficiency. The above traditional techniques not only make it difficult to completely remove oxalic acid, leading to low product purity, but also have cumbersome production processes and high costs. At the same time, it is difficult to repair and replace internal components. Therefore, the present invention proposes a reaction device for removing oxalic acid from glyoxylic acid using macroporous resin. Summary of the Invention

[0004] (I) Technical Problems to be Solved

[0005] In view of the deficiencies of the prior art, the present invention provides a reaction device for removing oxalic acid from glyoxylic acid using macroporous resin, which solves the above problems.

[0006] (II) Technical Solutions

[0007] To achieve the above object, the present invention provides the following technical solution: A reaction device for removing oxalic acid from glyoxylic acid using macroporous resin, including a slender chromatography column, and a resin inlet pipe and a resin outlet pipe are respectively fixedly connected to the side wall of the chromatography column at positions corresponding to near the top and the bottom. It further includes:

[0008] Two groups of filter media precipitation plate groups, which are respectively filled inside the chromatography column above the resin inlet pipe and below the resin outlet pipe, for removing oxalic acid from glyoxylic acid by backwashing and normal washing methods. The filter media precipitation plate group is composed of an upper filter plate, a lower filter plate, filter cloth one, and filter cloth two stacked up and down, and filter cloth one and filter cloth two are stacked between the upper filter plate and the lower filter plate that are in upper and lower contact.

[0009] The upper and lower convex ring filling bins are respectively arranged in a protruding manner at positions near the top and bottom of the chromatography column for filling two groups of filter media precipitation plate groups. The convex ring filling bin is composed of a split semi-ring cavity member one and a semi-ring cavity member two.

[0010] A downward movement clamping structure is arranged between the corresponding upper filter plate and the lower filter plate in the filter media precipitation plate group. This downward movement clamping structure is used to cooperate with the convex ring filling bin to fix between the upper filter plate and the lower filter plate and decompose the filter media precipitation plate group.

[0011] Preferably, the integrated semi-ring cavity member one is fixedly arranged on the side wall of the chromatography column above the resin inlet pipe and below the resin outlet pipe respectively. The semi-ring cavity member one and the semi-ring cavity member two are symmetric and both are in the shape of the same semi-ring. Flange rings are integrally fixed on both ends of the semi-ring cavity member one and the semi-ring cavity member two, and the semi-ring cavity member one and the semi-ring cavity member two are fixedly connected through the flange rings and bolts to form a convex ring filling bin protruding from the side wall of the chromatography column. The convex ring filling bin is a closed ring shape. A ring through cavity communicating with the convex ring filling bin is opened on the side wall of the chromatography column, and the top inner wall and the bottom inner wall of the ring through cavity are flush with the top inner wall and the bottom inner wall of the convex ring filling bin.

[0012] Preferably, the two groups of filter media precipitation plate groups are respectively horizontally and closely filled in the upper and lower convex ring filling bins on the chromatography column. The overall thickness and diameter of the filter media precipitation plate group are the same as the internal thickness and the maximum inner diameter of the convex ring filling bin, that is, the diameters of the upper filter plate and the lower filter plate are the same as the maximum inner diameter of the convex ring filling bin, and the thicknesses of the upper filter plate and the lower filter plate are both half of the internal thickness of the convex ring filling bin.

[0013] Preferably, a circular groove is opened on the top outer wall of the lower filter plate corresponding to in the filter media precipitation plate group. The inner diameter of the circular groove is the same as the diameters of the first filter cloth and the second filter cloth, and the diameters of the first filter cloth and the second filter cloth are larger than the inner diameter of the chromatography column. The depth of the circular groove is the sum of the thicknesses of the first filter cloth and the second filter cloth, and the first filter cloth and the second filter cloth are stacked closely in the circular groove opened on the lower filter plate. The diameter of the circular area with filter holes on the upper filter plate and the lower filter plate is the same as the inner diameter of the chromatography column.

[0014] Preferably, the aperture diameters of the filter holes on the upper filter plate and the lower filter plate in the filter media precipitation plate group are between 13 - 16 mm, the mesh number of the first filter cloth is between 95 - 105, the mesh number of the second filter cloth is between 55 - 65, and the first filter cloth in the upper layer of the filter media precipitation plate group in the chromatography column is located below the second filter cloth, and the first filter cloth in the lower layer of the filter media precipitation plate group in the chromatography column is located above the second filter cloth.

[0015] Preferably, alignment jacks are provided at positions on the inner wall of the bottom of the circular groove corresponding to the vicinity of both sides, and through holes communicating with the alignment jacks up and down are provided at both sides of the superposed filter cloth one and filter cloth two. Integrated positioning insertion rods are fixed on the outer wall of the bottom end of the upper filter plate corresponding to both sides. The positioning insertion rods are adapted to the through holes and the alignment jacks. The two groups of positioning insertion rods at the bottom end of the upper filter plate pass through the through holes formed in the filter cloth one and the filter cloth two and are inserted into the alignment jacks formed in the lower filter plate.

[0016] Preferably, a sealing structure is further provided between the chromatography column and the two groups of filter material precipitation plates. The sealing structure includes an annular cavity groove, a first spring, and a sealing ring. The chromatography column is provided with two groups of annular cavity grooves that are symmetrically arranged up and down on the inner wall of the top and the inner wall of the bottom corresponding to the annular through cavity. A plurality of groups of first springs arranged in an annular and equidistant manner are fixedly connected to the inner wall of the top and the inner wall of the bottom of the two groups of annular cavity grooves in the annular through cavity. The sealing ring is composed of a circular ring part and a rubber sealing strip. Circular ring parts are fixedly connected to the ends of the plurality of groups of first springs in the annular through cavity that are close to each other. The circular ring parts are sleeved with integrated rubber sealing strips on the outer surfaces of the other three sides except for the side connected to the first spring. The outer surface of the rubber sealing strip is slidably attached to the inner walls of both sides of the annular cavity groove. The annular end walls of the two groups of rubber sealing strips that are close to each other are flush with the inner wall of the top and the inner wall of the bottom of the annular through cavity respectively. The plurality of groups of first springs in the annular cavity groove are in a compressed energy storage state, and the annular ends of the two groups of sealing rings that are close to each other are tightly attached to the top end and the bottom end of the filter material precipitation plate group respectively.

[0017] Preferably, the downward clamping structure includes a cylindrical member, a fixed cylindrical groove, a triangular clamping block, a second spring, and a triangular clamping groove. Cylindrical through-holes that penetrate up and down are formed on both sides of the upper filter plate in the filter media precipitation plate group corresponding to the first filter cloth. A fixed cylindrical groove that is vertically aligned and communicated with the two cylindrical through-holes is formed on the outer wall of the top end of the lower filter plate, and the inner diameters of the cylindrical through-holes and the fixed cylindrical groove are the same. Cylindrical members are slidably sleeved in the two cylindrical through-holes on the corresponding sides of the upper filter plate. The height of the cylindrical member is greater than the thickness of the upper filter plate. The top end of the cylindrical member is flush with the top end of the upper filter plate and abuts against the inner wall of the top of the convex ring filling bin, and the bottom end of the cylindrical member extends and is inserted into the fixed cylindrical groove. A through empty groove that penetrates both sides is formed in the bottom area of the cylindrical member corresponding to the fixed cylindrical groove, and triangular clamping blocks that are located on both sides and are symmetrical to each other are slidably clamped in the through empty groove of the cylindrical member. A second spring is fixedly connected between the two triangular clamping blocks. The cross-section of the triangular clamping block is a right triangle, and the outer side walls of the two triangular clamping blocks facing away from each other are inclined with the bottom ends converging towards each other. The top parts of the two triangular clamping blocks corresponding to the bottom of the cylindrical member protrude from the outer side walls of the two sides of the cylindrical member, and the bottom ends of the two triangular clamping blocks are located in the through empty groove. Triangular clamping grooves adapted to the protruding parts of the triangular clamping blocks are formed on the inner walls of the two sides of the fixed cylindrical groove near the top end, and the protruding parts of the two triangular clamping blocks in the cylindrical member are fitted and clamped in the through empty grooves on both sides. The inner side walls of the two triangular clamping grooves in the fixed cylindrical groove that are symmetrical are also inclined with the bottom ends converging towards each other.

[0018] Preferably, the downward clamping structure further includes an outer convex ring cavity, a circular ring clamping plate, a rotating ring member, and a third spring. There is a spaced space between the outer wall of the bottom end of the cylindrical member and the inner wall of the bottom end of the fixed cylindrical groove, and the height of the spaced space is greater than the height of the bottom area where the cylindrical member is inserted into the fixed cylindrical groove. An outwardly expanding outer convex ring cavity is formed on the inner side wall of the upper filter plate corresponding to the cylindrical through-hole, and the opening height of the outer convex ring cavity is greater than the opening depth of the fixed cylindrical groove. An integrally formed circular ring clamping plate that is slidably clamped in the outer convex ring cavity is fixedly provided on the outer side wall of the cylindrical member. The spaced height between the outer wall of the top end of the circular ring clamping plate and the inner wall of the top end of the outer convex ring cavity is the same as the height of the bottom area where the cylindrical member is inserted into the fixed cylindrical groove. A circular ring limiting groove is formed on the inner wall of the bottom of the upper filter plate corresponding to the outer convex ring cavity near the outer circle, and a rotating ring member is rotatably clamped in the circular ring limiting groove. A third spring located on both sides in the outer convex ring cavity is fixedly connected between the outer wall of the bottom end of the outer convex ring cavity and the outer wall of the top end of the rotating ring member, and the third spring is in a state of energy storage compression. The spaced distance between the outer wall of the bottom end of the circular ring clamping plate and the inner wall of the bottom end of the outer convex ring cavity is greater than the spaced distance between the outer wall of the bottom end of the cylindrical member and the inner wall of the bottom end of the fixed cylindrical groove, and the spaced distance between the two third springs is greater than the maximum spaced distance between the inner walls of the two triangular clamping grooves in the fixed cylindrical groove.

[0019] Preferably, a rectangular relay hole is formed at the center of the top end of the cylindrical part.

[0020] (III) Beneficial Effects

[0021] Compared with the prior art, the present invention provides a glyoxylic acid oxalic acid removal reaction device using macroporous resin, which has the following beneficial effects:

[0022] Efficiently remove oxalic acid and ensure product quality: The macroporous resin can effectively adsorb oxalic acid in glyoxylic acid. Cooperating with the upper and lower filter media precipitation plate groups, the upper filter plate, the lower filter plate, and the filter cloth I and filter cloth II with different mesh numbers cooperate with each other to effectively intercept impurities with different particle sizes, including broken resin particles and tiny impurities, and can intercept broken resin particles and other tiny impurities, ensuring the purity of the outflowing glyoxylic acid, reducing the impact of impurities on product quality, improving the purity and quality of the product, and meeting the strict requirements for the quality of glyoxylic acid in production.

[0023] Facilitate equipment maintenance and component replacement: The split structure of the convex ring filling bin and the downward shifting clamping structure cooperating therewith facilitate the installation, disassembly, and decomposition of the filter media precipitation plate group; by screwing the bolts, the semi-ring cavity part II can be disassembled, and the filter media precipitation plate group can be taken out as a whole; by using the downward shifting clamping structure and operating the cylindrical part with a screwdriver, the filter media precipitation plate group can be easily disassembled, facilitating the cleaning or replacement of the filter cloth I and filter cloth II, reducing the difficulty of equipment maintenance, reducing maintenance time and cost, and improving the service life and operating efficiency of the equipment.

[0024] Precise positioning and stable support: The circular groove, alignment jack, positioning plug, and through hole in the filter media precipitation plate group cooperate with each other to accurately position the upper filter plate, the lower filter plate, and the filter cloth I and filter cloth II during assembly, ensuring the accurate installation position of each component; at the same time, during the reaction process, these structures can prevent the filter cloth from being misaligned or deformed due to the action of the fluid, ensuring stable filtration effect; the convex ring filling bin provides stable support for the filter media precipitation plate group, ensuring its fixed position in the chromatography column and making the operation of the device more reliable.

[0025] Good sealing performance to prevent material leakage: The sealing structure is composed of an annular cavity groove, a spring I, and a sealing ring. The compression energy storage of the spring I provides a stable outward thrust for the sealing ring, making the sealing ring closely fit the top and bottom ends of the filter media precipitation plate group, effectively preventing material leakage, avoiding raw material loss and environmental pollution, and ensuring the safety and hygiene of the production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic structural diagram of the present invention;

[0027] Figure 2 is a schematic exploded sectional view of the chromatography column of the present invention;

[0028] Figure 3Schematic decomposition diagram of the filter media precipitation plate group of the present invention;

[0029] Figure 4 Cross-sectional schematic view of the filter media precipitation plate group of the present invention Figure 1 ;

[0030] Figure 5 is Figure 2 Partial enlarged schematic view at position A in

[0031] Figure 6 Cross-sectional schematic view of the filter media precipitation plate group of the present invention Figure 2 ;

[0032] Figure 7 is Figure 6 Partial enlarged schematic view at position B in

[0033] Figure 8 Cross-sectional schematic view of the filter media precipitation plate group of the present invention Figure 3 ;

[0034] Figure 9 is Figure 8 Partial enlarged schematic view at position C in

[0035] In the figure: 1, chromatography column; 2, convex ring filling bin; 3, semi-ring cavity part one; 4, semi-ring cavity part two; 5, filter media precipitation plate group; 6, ring through cavity; 7, upper filter plate; 8, lower filter plate; 9, filter cloth one; 10, filter cloth two; 11, circular groove; 12, alignment jack; 13, through hole; 14, positioning plug; 15, annular cavity groove; 16, spring one; 17, sealing ring; 18, circular ring part; 19, rubber sealing strip; 20, cylindrical through hole; 21, cylindrical part; 22, fixed connection cylindrical groove; 23, through empty groove; 24, triangular clamping block; 25, spring two; 26, triangular clamping groove; 27, outer convex ring cavity; 28, circular ring clamping plate; 29, circular ring limiting groove; 30, rotating ring part; 31, spring three; 32, relay hole. Specific embodiments

[0036] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0037] Please refer to Figures 1-9, A glyoxylic acid oxalic acid removal reaction device using macroporous resin, including a slender chromatography column 1. The side wall of the chromatography column 1 is fixedly connected with a resin inlet pipe and a resin outlet pipe respectively at positions corresponding to near the top and the bottom. At the same time, a plurality of groups of vertically distributed liquid level observation holes are also fixedly arranged on the outer side wall of the chromatography column 1 for maintenance and resin filling. The top and bottom of the chromatography column 1 are both fixedly connected with at least five groups of material inlet and outlet pipe holes to meet the requirements of using acids, alkalis, and water for resin activation and regeneration, plus the feed inlet, as well as the addition or discharge of raw materials during the removal of oxalic acid in glyoxylic acid. It further includes:

[0038] Two groups of filter media precipitation plate groups 5 are respectively filled above the resin inlet pipe and below the resin outlet pipe inside the chromatography column 1 for removing oxalic acid in glyoxylic acid by backwashing and normal washing methods. The filter media precipitation plate group 5 is composed of an upper filter plate 7, a lower filter plate 8, a first filter cloth 9, and a second filter cloth 10 stacked up and down, and the first filter cloth 9 and the second filter cloth 10 are stacked between the upper filter plate 7 and the lower filter plate 8 that are in upper and lower fit;

[0039] Two upper and lower convex ring filling bins 2 are respectively protrudingly arranged at positions on the chromatography column 1 near the top and the bottom for filling two groups of filter media precipitation plate groups 5. The convex ring filling bin 2 is composed of a split semi-ring cavity part one 3 and a semi-ring cavity part two 4;

[0040] A downward movement clamping structure corresponding to between the upper filter plate 7 and the lower filter plate 8 in the filter media precipitation plate group 5 is set. This downward movement clamping structure is used to cooperate with the convex ring filling bin 2 to fix between the upper filter plate 7 and the lower filter plate 8 and disassemble the filter media precipitation plate group 5.

[0041] Furthermore, integrated semi-ring cavity parts one 3 are fixedly arranged on the side wall of the chromatography column 1 above the resin inlet pipe and below the resin outlet pipe. The semi-ring cavity part one 3 and the semi-ring cavity part two 4 are symmetrical and both are in the same semi-circular shape. Flange rings are integrally fixed on both ends of the semi-ring cavity part one 3 and the semi-ring cavity part two 4, and the semi-ring cavity part one 3 and the semi-ring cavity part two 4 are fixedly connected through the flange rings and bolts to form a convex ring filling bin 2 protruding from the side wall of the chromatography column 1. The convex ring filling bin 2 is a closed ring shape. A ring through cavity 6 communicating with the convex ring filling bin 2 is opened on the side wall of the chromatography column 1, and the top inner wall and the bottom inner wall of the ring through cavity 6 are flush with the top inner wall and the bottom inner wall of the convex ring filling bin 2. The convex ring filling bin 2 provides stable support for the filter media precipitation plate group 5 while facilitating the installation and disassembly of the filter media precipitation plate group 5, ensuring its fixed position inside the chromatography column 1.

[0042] Furthermore, the two groups of filter media precipitation plate groups 5 are respectively horizontally fitted and filled in the upper and lower convex ring filling bins 2 of the chromatography column 1. The overall thickness and diameter of the filter media precipitation plate group 5 are the same as the internal thickness and the maximum inner diameter of the convex ring filling bin 2. That is, the diameters of the upper filter plate 7 and the lower filter plate 8 are the same as the maximum inner diameter of the convex ring filling bin 2, and the thicknesses of both the upper filter plate 7 and the lower filter plate 8 are half of the internal thickness of the convex ring filling bin 2. The design of the tight fit between the filter media precipitation plate group 5 and the convex ring filling bin 2 ensures that there is no bypass phenomenon when the material passes through the filter media precipitation plate group 5, guaranteeing that all glyoxylic acid to be treated can pass through the filtration of the first filter cloth 9 and the second filter cloth 10, thereby improving the filtration efficiency and the oxalic acid removal effect. At the same time, this tightly fitting structure also helps to reduce the shaking of the filter media precipitation plate group 5 in the chromatography column 1, enhancing the stability of the device operation.

[0043] Furthermore, a circular groove 11 is formed on the top outer wall of the lower filter plate 8 corresponding to the filter media precipitation plate group 5. The inner diameter of the circular groove 11 is the same as the diameters of the first filter cloth 9 and the second filter cloth 10, and the diameters of the first filter cloth 9 and the second filter cloth 10 are larger than the inner diameter of the chromatography column 1. The depth of the circular groove 11 is the sum of the thicknesses of the first filter cloth 9 and the second filter cloth 10, and the first filter cloth 9 and the second filter cloth 10 are stacked and fitted in the circular groove 11 formed on the lower filter plate 8. The diameter of the circular area with filter holes on the upper filter plate 7 and the lower filter plate 8 is the same as the inner diameter of the chromatography column 1. The depth of the circular groove 11 matches the filter cloth thickness, which can enable the filter cloth to better exert its filtering performance and avoid affecting the filtering effect due to filter cloth wrinkles or unevenness.

[0044] Furthermore, the aperture diameters of the filter holes on the upper filter plate 7 and the lower filter plate 8 of the filter media precipitation plate group 5 are between 13 - 16 mm, the mesh number of the first filter cloth 9 is between 95 - 105, and the mesh number of the second filter cloth 10 is between 55 - 65. And in the upper layer of the chromatography column 1, the first filter cloth 9 in the filter media precipitation plate group 5 is located below the second filter cloth 10, and in the lower layer of the chromatography column 1, the first filter cloth 9 in the filter media precipitation plate group 5 is located above the second filter cloth 10. The aperture diameters of the filter holes are between 13 - 16 mm, and this size range is carefully designed. The larger aperture diameter can allow the liquid to pass through quickly, ensuring the reaction flux and avoiding the influence on production efficiency due to too small an aperture diameter that causes poor liquid flow. At the same time, this aperture diameter can block larger particulate impurities and work together with the first filter cloth 9 and the second filter cloth 10 to effectively intercept impurities of different particle sizes. Moreover, the different upper and lower positions of the first filter cloth 9 and the second filter cloth 10 in the upper and lower filter media precipitation plate groups 5 can perform targeted filtration according to the impurity distribution characteristics, further improving the filtration accuracy.

[0045] Furthermore, on the inner wall of the bottom of the circular groove 11, alignment jacks 12 are provided corresponding to positions near both sides. Through holes 13 that communicate with the alignment jacks 12 up and down are provided at both sides of the stacked filter cloth one 9 and filter cloth two 10. On the outer wall of the bottom end of the upper filter plate 7, integrated positioning insertion rods 14 are fixed corresponding to both sides. The positioning insertion rods 14 are adapted to the through holes 13 and alignment jacks 12. The two groups of positioning insertion rods 14 at the bottom end of the upper filter plate 7 pass through the through holes 13 provided on the filter cloth one 9 and filter cloth two 10 and are inserted into the alignment jacks 12 provided on the lower filter plate 8. When installing the filter media precipitation plate group 5, through the precise insertion of the two, the positioning of the upper filter plate 7, the lower filter plate 8, the filter cloth one 9, and the filter cloth two 10 can be quickly achieved, improving the assembly efficiency. During the reaction process, this tight insertion structure can effectively prevent relative displacement between the components of the filter media precipitation plate group 5. Even in the case of a large impact force generated by the material flow, the filtering performance of the device can be ensured to be stable.

[0046] Furthermore, a sealing structure is provided between the chromatography column 1 and the two groups of filter media precipitation plate groups 5. The sealing structure includes an annular cavity groove 15, a first spring 16, and a sealing ring 17. On the top inner wall and bottom inner wall of the annular through cavity 6 corresponding to the chromatography column 1, two groups of annular cavity grooves 15 that are symmetric up and down are provided. On the top inner wall and bottom inner wall of the two groups of annular cavity grooves 15 in the annular through cavity 6, multiple groups of first springs 16 that are annularly and equidistantly distributed are fixedly connected. The sealing ring 17 is composed of a circular ring part 18 and a rubber sealing strip 19. On the end heads of the multiple groups of first springs 16 in the annular through cavity 6 that are close to each other, circular ring parts 18 are fixedly connected. The circular ring part 18 is sleeved with an integrated rubber sealing strip 19 corresponding to the outer surfaces of the three sides except for connecting the first spring 16. The outer surface of the rubber sealing strip 19 is slidably attached to the inner walls of both sides of the annular cavity groove 15. The annular end walls of the two groups of rubber sealing strips 19 that are close to each other are flush with the top inner wall and bottom inner wall of the annular through cavity 6 respectively. The multiple groups of first springs 16 in the annular cavity groove 15 are all in a compressed energy storage state. The annular ends of the two groups of sealing rings 17 that are close to each other are respectively tightly attached to the top end and bottom end of the filter media precipitation plate group 5. The annular cavity groove 15 in the sealing structure provides a precise installation position for the first spring 16 and the sealing ring 17, ensuring that the sealing ring 17 can accurately fit the top end and bottom end of the filter media precipitation plate group 5 under the action of the first spring 16. The first spring 16 is in a compressed energy storage state, which not only provides a stable sealing pressure but also has a clamping and positioning effect on the filter media precipitation plate group 5.

[0047] Further, the downward clamping structure includes a cylindrical member 21, a fixed cylindrical groove 22, a triangular clamping block 24, a second spring 25, and a triangular clamping groove 26. Cylindrical through holes 20 that penetrate up and down are provided on both sides of the upper filter plate 7 corresponding to the first filter cloth 9 in the filter media precipitation plate group 5. A fixed cylindrical groove 22 that is vertically aligned and communicated with the two cylindrical through holes 20 is provided on the outer wall of the top end of the lower filter plate 8, and the inner diameters of the cylindrical through holes 20 and the fixed cylindrical groove 22 are the same. Cylindrical members 21 are slidably sleeved in the two cylindrical through holes 20 on both sides of the upper filter plate 7. The height of the cylindrical member 21 is greater than the thickness of the upper filter plate 7. The top end of the cylindrical member 21 is flush with the top end of the upper filter plate 7 and abuts against the inner wall of the top of the convex ring filling bin 2, and the bottom end of the cylindrical member 21 extends and is inserted into the fixed cylindrical groove 22. A through groove 23 that penetrates both sides is provided in the bottom area of the cylindrical member 21 corresponding to the fixed cylindrical groove 22. Triangular clamping blocks 24 that are located on both sides and are symmetric to each other are slidably clamped in the through groove 23 corresponding to the cylindrical member 21. A second spring 25 is fixedly connected between the two triangular clamping blocks 24. The cross section of the triangular clamping block 24 is a right triangle, and the outer walls of the sides of the two triangular clamping blocks 24 facing away from each other are inclined with the bottom ends converging towards each other. The top ends of the two triangular clamping blocks 24 corresponding to the bottom of the cylindrical member 21 protrude from the outer walls of both sides of the cylindrical member 21, and the bottom ends of the two triangular clamping blocks 24 are located in the through groove 23. Triangular clamping grooves 26 that are adapted to the protruding parts of the triangular clamping blocks 24 are provided on the inner walls of the two sides of the fixed cylindrical groove 22 near the top end. The protruding parts of the two triangular clamping blocks 24 in the cylindrical member 21 are fitted and clamped in the two through grooves 23, and the inner walls of the two sides of the triangular clamping grooves 26 in the fixed cylindrical groove 22 that are symmetric are also inclined with the bottom ends converging towards each other.

[0048] Furthermore, the downward clamping structure further includes an outer convex ring cavity 27, a circular ring clamping plate 28, a rotating ring member 30, and a third spring 31. There is a spaced space between the outer wall of the bottom end of the cylindrical member 21 and the inner wall of the bottom end of the fixed connection cylindrical groove 22, and the height of the spaced space is greater than the height of the bottom area where the cylindrical member 21 is inserted into the fixed connection cylindrical groove 22. The upper filter plate 7 is provided with an outwardly expanding outer convex ring cavity 27 on the inner wall of the side corresponding to the cylindrical through hole 20, and the opening height of the outer convex ring cavity 27 is greater than the opening depth of the fixed connection cylindrical groove 22. An integrally formed circular ring clamping plate 28 that is slidably clamped in the outer convex ring cavity 27 is fixedly provided on the outer wall of the side of the cylindrical member 21. The spaced height between the outer wall of the top end of the circular ring clamping plate 28 and the inner wall of the top end of the outer convex ring cavity 27 is the same as the height of the bottom area where the cylindrical member 21 is inserted into the fixed connection cylindrical groove 22. The upper filter plate 7 is provided with a circular ring limiting groove 29 on the inner wall of the bottom of the outer convex ring cavity 27 near the outer ring, and a rotating ring member 30 is rotatably clamped in the circular ring limiting groove 29. A third spring 31 located on both sides in the outer convex ring cavity 27 is fixedly connected between the outer wall of the bottom end of the outer convex ring cavity 27 and the outer wall of the top end of the rotating ring member 30, and the third spring 31 is in an energy storage compression state. The spaced distance between the outer wall of the bottom of the circular ring clamping plate 28 and the inner wall of the bottom of the outer convex ring cavity 27 is greater than the spaced distance between the outer wall of the bottom end of the cylindrical member 21 and the inner wall of the bottom end of the fixed connection cylindrical groove 22, and the spaced distance between the two third springs 31 is greater than the maximum spaced distance between the inner walls of the two triangular clamping grooves 26 in the fixed connection cylindrical groove 22.

[0049] Furthermore, a rectangular relay hole 32 is opened at the center of the top end of the cylindrical member 21, and the rectangular relay hole 32 provides a convenient operation interface for disassembling the filter media precipitation plate group 5.

[0050] Working principle: Oxalic acid removal reaction process: Before the oxalic acid removal reaction, first fill 400 kg (about 0.592 M³) of macroporous resin into the slender chromatography column 1 through the resin inlet tube. After filling, the resin needs to be cleaned and pretreated. First, backwash the chromatography column with 2.4 M³ of 4% hydrochloric acid to initially remove the impurities adsorbed by the resin during storage or transportation; then rinse with 2.4 M³ of pure water to further wash away the residual hydrochloric acid; then rinse with 2.4 M³ of liquid alkali to remove other possible impurities; finally, rinse with about 2.4 M³ of pure water again until the CL⁻ is detected to be ≤ 30 ppm and then drain the water to ensure that the resin reaches the required purity for the reaction.

[0051] After the pre-treatment is completed, feeding begins. A4 glyoxylic acid is fed from the bottom of chromatography column 1. When the glyoxylic acid submerges the upper filter screen, the feeding is closed, and a short self-circulation is carried out to make the glyoxylic acid preliminarily evenly distributed in the column. Subsequently, feeding is carried out from the upper feeding port, and the material passes through the resin layer in the forward direction. During this process, the macroporous resin plays an adsorption role, adsorbing the oxalic acid in the glyoxylic acid, thereby realizing the separation of oxalic acid and glyoxylic acid. Since heat is released when the resin adsorbs impurities, the temperature usually rises by about 25°C, and the heat resistance of the resin generally does not exceed 80°C, so the reaction temperature needs to be closely monitored. If the initial temperature of the glyoxylic acid is low and the temperature does not reach 80°C during the reaction process, no additional cooling is required; if the temperature is too high, corresponding cooling measures need to be taken to ensure the stable performance of the resin and ensure the smooth progress of the oxalic acid removal reaction.

[0052] As the feeding continues, the glyoxylic acid after the resin adsorbs oxalic acid flows upward and is filtered by the upper filter medium precipitation plate group 5. The filter medium precipitation plate group 5 is composed of an upper filter plate 7, a lower filter plate 8, a first filter cloth 9, and a second filter cloth 10 stacked up and down. Among them, the first filter cloth 9 and the second filter cloth 10 can not only intercept the resin particles broken during the reaction process, but also further filter other tiny impurities in the liquid, ensuring that the outflowing glyoxylic acid does not contain resin and other impurities; the above steps can be repeated until the discharged glyoxylic acid meets the finished product specifications.

[0053] During the oxalic acid removal reaction process, the glyoxylic acid adsorbed by the resin is mainly filtered and discharged through the upper and lower filter media precipitation plate groups 5. The upper and lower filter media precipitation plate groups 5 prevent the macroporous resin from being discharged together with the glyoxylic acid. During the reaction process, some resins will be broken. Therefore, the filter cloth 9 filled in the upper and lower filter media precipitation plate groups 5 can intercept the broken resins. The convex ring filling bin 2 plays an important role in the installation, disassembly, and support of the filter media precipitation plate group 5. After the oxalic acid removal reaction in the glyoxylic acid is completed, the two filter media precipitation plate groups 5 can be removed from the chromatography column 1. At this time, by screwing the bolts on the flange rings at the ends of the half-ring cavity part 1 and the half-ring cavity part 2 4, the half-ring cavity part 2 4 that is not integrated with the chromatography column 1 can be removed from the chromatography column 1. At this time, the outer side wall of the half-ring of the filter media precipitation plate group 5 will protrude and be exposed. By applying an outward pulling force, the entire filter media precipitation plate group 5 can be detached from the inside of the chromatography column 1. At this time, the upper and lower groups of springs 16 in a compressed energy storage state in the annular through cavity 6 will return to their original state, thus protruding the upper and lower sealing ring gaskets 17 from the inner wall of the annular end of the annular through cavity 6. At the same time, during the normal reaction process, the convex ring filling bin 2 provides stable support for the filter media precipitation plate group 5, ensuring its fixed position in the chromatography column 1 and guaranteeing the stability of the filtration effect.After disassembling the filter media precipitation plate group 5, at this time, insert the tip of the screwdriver into the relay holes 32 opened at the tops of the two cylindrical parts 21 on the upper filter plate 7, and press down on the cylindrical part 21 forcefully. At this time, the bottom of the cylindrical part 21 will continue to move downward along the fixed connection cylindrical groove 22. At this time, through the inclined inner walls of the two triangular card slots 26 in the fixed connection cylindrical groove 22 that are converging at the bottom end, the two triangular clamping blocks 24 in the cylindrical part 21 will be squeezed into the through empty groove 23 and compress the second spring 25 to deform until the bottom end of the cylindrical part 21 touches the bottom inner wall of the fixed connection cylindrical groove 22. Since the interval height between the outer wall of the bottom end of the cylindrical part 21 and the bottom inner wall of the fixed connection cylindrical groove 22 is greater than the height of the cylindrical part 21 inserted into the fixed connection cylindrical groove 22 at the initial time, the two groups of triangular clamping blocks 24 will be completely squeezed into the through empty groove 23 by the two inner walls of the fixed connection cylindrical groove 22. At this time, the circular ring clamping plate 28 moves downward synchronously with the cylindrical part 21, further compressing the third spring 31. After that, the screwdriver can be rotated to drive the whole cylindrical part 21 to rotate. At this time, the rotating ring part 30 is rotationally clamped in the circular ring limiting groove 29, so that the compressed third spring 31 and the circular ring clamping plate 28 can rotate synchronously with the cylindrical part 21. After the whole cylindrical part 21 is rotated by ninety degrees, release the pressing force on the cylindrical part 21. Through the reaction force of the deformation of the third spring 31, drive the circular ring clamping plate 28 and the cylindrical part 21 to move upward quickly synchronously until the top end of the circular ring clamping plate 28 touches the top inner wall of the outer convex ring cavity 27. Since the interval height between the circular ring clamping plate 28 and the top inner wall of the outer convex ring cavity 27 is the same as the depth of the cylindrical part 21 inserted into the fixed connection cylindrical groove 22 at the initial time, under the action of removing the external force, the cylindrical part 21 can move upward until the bottom end of the cylindrical part 21 is flush with the bottom end of the upper filter plate 7. At this time, the cylindrical part 21 and the triangular clamping blocks 24 are completely separated from the fixed connection cylindrical groove 22 opened on the lower filter plate 8, and the top end of the cylindrical part 21 protrudes from the top end of the upper filter plate 7, thus releasing the fixed connection relationship between the upper filter plate 7 and the lower filter plate 8, and the decomposition of the filter media precipitation plate group 5 can be completed. The first filter cloth 9 and the second filter cloth 10 filled between the upper filter plate 7 and the lower filter plate 8 can be removed and cleaned or replaced;

[0054] After cleaning or replacing the first filter cloth 9 and the second filter cloth 10, reassemble the complete filter media precipitation plate group 5 and install it into the chromatography column 1. At this time, pay attention to the positions of the first filter cloth 9 and the second filter cloth 10 in the filter media precipitation plate group 5 at different heights in the chromatography column 1. When assembling the filter media precipitation plate group 5 to be installed in the upper layer of the chromatography column 1, first lay the clean first filter cloth 9 flat and fill it into the circular groove 11 opened on the lower filter plate 8, and then stack the second filter cloth 10 flat on the first filter cloth 9; when assembling the filter media precipitation plate group 5 to be installed in the lower layer of the chromatography column 1, first lay and fill the second filter cloth 10 flat and then stack the first filter cloth 9, that is, the first filter cloth 9 in the upper filter media precipitation plate group 5 is located below the second filter cloth 10, and the first filter cloth 9 in the lower filter media precipitation plate group 5 is located above the second filter cloth 10; after the first filter cloth 9 and the second filter cloth 10 are stacked and filled into the circular groove 11 opened on the lower filter plate 8, rotate and adjust the first filter cloth 9 and the second filter cloth 10 to make the upper through holes 13 on the first filter cloth 9 and the second filter cloth 10 align and communicate with the alignment jacks 12 on both sides in the lower filter plate 8. Then stack the upper filter plate 7 and the lower filter plate 8 closely up and down, and insert the positioning insertion rods 14 at both bottom ends of the upper filter plate 7 through the through holes 13 on the first filter cloth 9 and the second filter cloth 10 and into the alignment jacks 12. By inserting the positioning insertion rods 14 at the bottom end of the upper filter plate 7 into the alignment jacks 12 on the lower filter plate 8 and passing through the through holes 13 opened on the first filter cloth 9 and the second filter cloth 10 in sequence, while completing the preliminary up and down fitting and positioning of the upper filter plate 7 and the lower filter plate 8, during subsequent use, the first filter cloth 9 and the second filter cloth 10 in the filter media precipitation plate group 5 can also be positioned and fixed to prevent the first filter cloth 9 and the second filter cloth 10 from being displaced or deformed due to the fluid action during the filtration of materials;

[0055] After the preliminary stacking of the upper filter plate 7 and the lower filter plate 8 is completed, through the insertion of the positioning insertion rods 14 and the alignment jacks 12, the positioning of the two cylindrical parts 21 on the upper filter plate 7 and the two fixed connection cylindrical grooves 22 on the lower filter plate 8 being aligned up and down is completed. Then, press down the cylindrical part 21 forcefully and synchronously rotate it counterclockwise by ninety degrees. After inserting the bottom of the cylindrical part 21 into the fixed connection cylindrical groove 22, the two triangular clamping blocks 24 on both sides will be completely squeezed into the through groove 23 by the port of the fixed connection cylindrical groove 22, and the spring two 25 will be compressed and deformed until the top of the cylindrical part 21 is flush with the top of the upper filter plate 7. During this process, when the two ports on both sides of the through groove 23 at the bottom of the cylindrical part 21 coincide with the two triangular clamping grooves 26 on both sides in the fixed connection cylindrical groove 22, the reaction force of the compressed spring two 25 can move the two triangular clamping blocks 24 horizontally to both sides, and make the two triangular clamping blocks 24 respectively snap into the two triangular clamping grooves 26 on both sides in the fixed connection cylindrical groove 22, thus completing the fixed connection of the upper filter plate 7 and the lower filter plate 8, that is, completing the reassembly of the filter media precipitation plate group 5. Then, install the two filter media precipitation plate groups 5 respectively in the upper layer and the lower layer of the chromatography column 1;

[0056] When installing the newly assembled filter media precipitation plate group 5, first synchronously squeeze the upper and lower sealing ring gaskets 17 located in the annular through cavity 6 upward and downward. After the outer walls of the ring ends of the upper and lower sealing ring gaskets 17 are flush with the inner walls of the ring ends of the annular through cavity 6, horizontally push the filter media precipitation plate group 5 into the semi-circular cavity part one 3 until half of the filter media precipitation plate group 5 is filled in the semi-circular cavity part one 3. Then, fix and connect the semi-circular cavity part two 4 and the semi-circular cavity part one 3 through multiple groups of bolts and flange rings to form a convex ring filling bin 2 in a closed-loop shape protruding from the chromatography column 1. Moreover, the overall thickness and diameter of the filter media precipitation plate group 5 are the same as the internal thickness and maximum inner diameter of the convex ring filling bin 2. That is, at this time, the filter media precipitation plate group 5 is completely fitted and filled inside the chromatography column 1. At this time, the spring one 16 in the energy storage state will generate an outward thrust on the sealing ring gasket 17, making the sealing ring gasket 17 closely fit the top and bottom of the filter media precipitation plate group 5, playing a good sealing role to prevent material leakage. At the same time, the thrust of the spring one 16 also plays a role in squeezing and positioning the filter media precipitation plate group 5, ensuring its stable position inside the chromatography column 1, and making the device enter the standby state for the next use of macroporous resin to remove oxalic acid from glyoxylic acid reaction.

[0057] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A reaction device for removing oxalic acid from glyoxylic acid using macroporous resin, characterized in that: It includes a slender chromatography column (1), and a resin inlet pipe and a resin outlet pipe are fixedly connected to the side wall of the chromatography column (1) at positions corresponding to near the top and the bottom respectively. It also includes: Two groups of filter media precipitation plate groups (5), which are respectively filled above the resin inlet pipe and below the resin outlet pipe inside the chromatography column (1) for removing oxalic acid in glyoxylic acid by backwashing and normal washing methods. The filter media precipitation plate group (5) is composed of an upper filter plate (7), a lower filter plate (8), a first filter cloth (9) and a second filter cloth (10) stacked up and down, and the first filter cloth (9) and the second filter cloth (10) are stacked between the upper filter plate (7) and the lower filter plate (8) that are in upper and lower contact; Upper and lower two-layer convex ring filling bins (2), which are respectively protrudingly arranged at positions near the top and the bottom of the chromatography column (1) for filling two groups of filter media precipitation plate groups (5). The convex ring filling bin (2) is composed of a split semi-ring cavity member one (3) and a semi-ring cavity member two (4); A downward movement clamping structure arranged between the upper filter plate (7) and the lower filter plate (8) in the filter media precipitation plate group (5), and this downward movement clamping structure is used to cooperate with the convex ring filling bin (2) to fix between the upper filter plate (7) and the lower filter plate (8) and disassemble the filter media precipitation plate group (5).

2. The glyoxylic acid oxalic acid removal reaction device using macroporous resin according to claim 1, wherein: The semi-ring cavity member one (3) integrated is fixedly provided on the side wall of the chromatography column (1) above the resin inlet pipe and below the resin outlet pipe. The semi-ring cavity member one (3) and the semi-ring cavity member two (4) are symmetrical and both are in the shape of the same semi-ring. Flange rings are integrally fixed on both ends of the semi-ring cavity member one (3) and the semi-ring cavity member two (4), and the semi-ring cavity member one (3) and the semi-ring cavity member two (4) are fixedly connected through the flange rings and bolts to form a convex ring filling bin (2) protruding from the side wall of the chromatography column (1), and the convex ring filling bin (2) is a closed ring shape. A ring through cavity (6) communicating with the convex ring filling bin (2) is opened on the side wall of the chromatography column (1), and the top inner wall and the bottom inner wall of the ring through cavity (6) are flush with the top inner wall and the bottom inner wall of the convex ring filling bin (2).

3. The glyoxylic acid oxalic acid removal reaction device using macroporous resin according to claim 2, characterized in that: The two groups of the filter media precipitation plate groups (5) are respectively horizontally and closely filled in the upper and lower two-layer convex ring filling bins (2) on the chromatography column (1). The overall thickness and diameter of the filter media precipitation plate group (5) are the same as the inner thickness and the maximum inner diameter of the convex ring filling bin (2), that is, the diameters of the upper filter plate (7) and the lower filter plate (8) are the same as the maximum inner diameter of the convex ring filling bin (2), and the thicknesses of the upper filter plate (7) and the lower filter plate (8) are both half of the inner thickness of the convex ring filling bin (2).

4. A glyoxylic acid oxalic acid removal reaction device using macroporous resin according to claim 3, characterized in that: A circular groove (11) is formed in the outer wall of the top of the lower filter plate (8) corresponding to the filter medium precipitation plate group (5). The inner diameter of the circular groove (11) is the same as the diameters of the first filter cloth (9) and the second filter cloth (10), and the diameters of the first filter cloth (9) and the second filter cloth (10) are larger than the inner diameter of the chromatography column (1). The depth of the circular groove (11) is the sum of the thicknesses of the first filter cloth (9) and the second filter cloth (10), and the first filter cloth (9) and the second filter cloth (10) are stacked and attached in the circular groove (11) formed in the lower filter plate (8). The diameter of the circular area with filter holes on the upper filter plate (7) and the lower filter plate (8) is the same as the inner diameter of the chromatography column (1).

5. The glyoxylic acid oxalic acid removal reaction device using macroporous resin according to claim 4, characterized in that: The aperture of the filter holes on the upper filter plate (7) and the lower filter plate (8) in the filter medium precipitation plate group (5) is between 13 and 16 mm. The mesh number of the first filter cloth (9) is between 95 and 105, and the mesh number of the second filter cloth (10) is between 55 and 65. The first filter cloth (9) in the upper filter medium precipitation plate group (5) in the chromatography column (1) is located below the second filter cloth (10), and the first filter cloth (9) in the lower filter medium precipitation plate group (5) in the chromatography column (1) is located above the second filter cloth (10).

6. The glyoxylic acid oxalic acid removal reaction device using macroporous resin according to claim 5, characterized in that: Alignment insertion holes (12) are formed in the inner wall of the bottom of the circular groove (11) corresponding to the positions near both sides, and through holes (13) communicating with the alignment insertion holes (12) up and down are formed at both sides of the stacked and attached first filter cloth (9) and second filter cloth (10). Integrally formed positioning insertion rods (14) are fixed on the outer wall of the bottom end of the upper filter plate (7) corresponding to both sides. The positioning insertion rods (14) are adapted to the through holes (13) and the alignment insertion holes (12). The two groups of positioning insertion rods (14) at the bottom end of the upper filter plate (7) pass through the through holes (13) formed in the first filter cloth (9) and the second filter cloth (10) and are inserted into the alignment insertion holes (12) formed in the lower filter plate (8).

7. The glyoxylic acid oxalic acid removal reaction device using macroporous resin according to claim 5, characterized in that: It further includes a sealing structure arranged between the chromatography column (1) and two groups of filter media precipitation plates (5). The sealing structure includes an annular cavity groove (15), a first spring (16), and a sealing ring (17). The chromatography column (1) is provided with two groups of symmetrically arranged upper and lower annular cavity grooves (15) on the top inner wall and the bottom inner wall corresponding to the annular through cavity (6). On the top inner wall and the bottom inner wall of the upper and lower two groups of annular cavity grooves (15) in the annular through cavity (6), a plurality of groups of first springs (16) arranged at equal intervals in a ring shape are fixedly connected. The sealing ring (17) is composed of a circular ring member (18) and a rubber sealing strip (19). On the mutually approaching ends of the plurality of upper and lower first springs (16) in the annular through cavity (6), circular ring members (18) are fixedly connected. On the outer surface of the circular ring member (18) corresponding to the side except for connecting the first spring (16), an integrated rubber sealing strip (19) is sleeved. The outer surface of the rubber sealing strip (19) is in sliding fit with the two inner walls of the annular cavity groove (15). The mutually approaching annular end walls of the upper and lower two groups of rubber sealing strips (19) are flush with the top inner wall and the bottom inner wall of the annular through cavity (6) respectively. The plurality of first springs (16) in the annular cavity groove (15) are all in a compressed energy storage state, and the mutually approaching annular ends of the upper and lower two groups of sealing rings (17) are respectively in close contact with the top end and the bottom end of the filter media precipitation plate group (5).

8. The glyoxylic acid oxalic acid removal reaction device using macroporous resin according to claim 4, characterized in that: The downward clamping structure includes a cylindrical member (21), a fixed cylindrical groove (22), a triangular clamping block (24), a second spring (25), and a triangular clamping groove (26). On both sides of the upper filter plate (7) in the filter media precipitation plate group (5) corresponding to the first filter cloth (9), there are vertically penetrating cylindrical through holes (20). On the outer wall of the top end of the lower filter plate (8), there is a fixed cylindrical groove (22) that is vertically aligned and communicated with the two groups of cylindrical through holes (20), and the inner diameters of the cylindrical through holes (20) and the fixed cylindrical groove (22) are the same. In the two groups of cylindrical through holes (20) corresponding to the upper filter plate (7), there are slidingly sleeved cylindrical members (21). The height of the cylindrical member (21) is greater than the thickness of the upper filter plate (7). The top end of the cylindrical member (21) is flush with the top end of the upper filter plate (7) and abuts against the inner wall of the top of the convex ring filling bin (2), and the bottom end of the cylindrical member (21) extends and is inserted into the fixed cylindrical groove (22). In the bottom area of the cylindrical member (21) corresponding to the fixed cylindrical groove (22), there is a through groove (23) that penetrates both sides, and in the through groove (23) of the cylindrical member (21), there are symmetrically arranged triangular clamping blocks (24) on both sides and slidingly clamped. A second spring (25) is fixedly connected between the two triangular clamping blocks (24) on both sides. The cross-section of the triangular clamping block (24) is a right triangle, and the outer walls of the mutually facing sides of the two triangular clamping blocks (24) are inclined with the bottom ends converging towards each other. At the bottom of the cylindrical member (21), the top parts of the two triangular clamping blocks (24) protrude from the outer walls on both sides of the cylindrical member (21), and the bottom ends of the two triangular clamping blocks (24) are both located in the through groove (23). On both inner walls near the top end of the fixed cylindrical groove (22), there are triangular clamping grooves (26) adapted to the protruding parts of the triangular clamping blocks (24). The protruding parts of the two triangular clamping blocks (24) in the cylindrical member (21) are both fitted and clamped in the through grooves (23) on both sides, and the inner walls of the two symmetrically arranged triangular clamping grooves (26) in the fixed cylindrical groove (22) are inclined with the bottom ends converging towards each other.

9. An oxalic acid removal reaction device for glyoxylic acid using macroporous resin according to claim 8, characterized in that: The downward clamping structure further includes an outer convex ring cavity (27), a circular ring clamping plate (28), a rotating ring member (30) and a third spring (31). There is a spaced space between the outer wall of the bottom end of the cylindrical member (21) and the inner wall of the bottom end of the fixed connection cylindrical groove (22), and the height of the spaced space is greater than the height of the bottom area where the cylindrical member (21) is inserted into the fixed connection cylindrical groove (22). The upper filter plate (7) is provided with an outwardly expanding outer convex ring cavity (27) on the inner wall of the side corresponding to the cylindrical through hole (20), and the opening height of the outer convex ring cavity (27) is greater than the opening depth of the fixed connection cylindrical groove (22). An integrally formed circular ring clamping plate (28) that is slidably clamped in the outer convex ring cavity (27) is fixedly provided on the outer wall of the side of the cylindrical member (21). The spaced height between the outer wall of the top end of the circular ring clamping plate (28) and the inner wall of the top end of the outer convex ring cavity (27) is the same as the height of the bottom area where the cylindrical member (21) is inserted into the fixed connection cylindrical groove (22). The upper filter plate (7) is provided with a circular ring limiting groove (29) near the outer circle on the inner wall of the bottom corresponding to the outer convex ring cavity (27), and a rotating ring member (30) is rotatably clamped in the circular ring limiting groove (29). A third spring (31) located on both sides in the outer convex ring cavity (27) is fixedly connected between the outer wall of the bottom end of the outer convex ring cavity (27) and the outer wall of the top end of the rotating ring member (30), and the third spring (31) is in an energy-storing compressed state. The spaced distance between the outer wall of the bottom end of the circular ring clamping plate (28) and the inner wall of the bottom end of the outer convex ring cavity (27) is greater than the spaced distance between the outer wall of the bottom end of the cylindrical member (21) and the inner wall of the bottom end of the fixed connection cylindrical groove (22), and the spaced distance between the two third springs (31) is greater than the maximum spaced distance between the inner walls of the two triangular clamping grooves (26) in the fixed connection cylindrical groove (22).

10. A glyoxylic acid oxalic acid removal reaction device using macroporous resin according to claim 9, characterized in that: A rectangular relay hole (32) is opened at the center of the top end of the cylindrical member (21).

Images