A kind of is VC sodium intermediate once pint color purification device

Abstract

The utility model relates to the technical field of hetero VC sodium production especially is a kind of hetero VC sodium intermediate primary product decolorization purification device, it is centrifuged to the hetero VC sodium intermediate primary product mother liquor and pressurized, improves decolorization purification efficiency;Including decolorization tank, inlet pipe and outlet pipe;Still including arc filter plate, filter cartridge, multiple blades and driving motor, arc filter plate is installed in the purification chamber middle part of decolorization tank, multiple filter holes one are set on the lateral wall of arc filter plate, decolorization purification filler one is filled in the purification chamber of decolorization tank in arc filter plate left part, filter cartridge is rotatably installed in the purification chamber right part of decolorization tank, filter cartridge is concentric with inlet pipe alignment, multiple filter holes two are set on the lateral wall of filter cartridge, decolorization purification filler two are arranged in the inside of arc filter plate, multiple blades are evenly installed on the outer wall of filter cartridge, driving motor is installed below decolorization tank, the output shaft of driving motor is transmission connection with filter cartridge.

Description

Technical Field

[0001] This utility model relates to the technical field of sodium iso-VC production, and in particular to a decolorization and purification device for a primary product of sodium iso-VC intermediate. Background Technology

[0002] Sodium isoascorbate, also known as sodium isoascorbate, is an optical isomer of vitamin C (ascorbic acid) and is commonly used as a food additive. In the production process of sodium isocyanate, the intermediate sodium isocyanate needs to be decolorized and purified. Various decolorization and purification devices are disclosed in the prior art. For example, Chinese utility model patent CN214130393U proposes a decolorization and purification kettle with good protective performance. This kettle includes a kettle body with a lid installed at the top. Inside the kettle body, a first activated carbon adsorption layer, a permeation layer, and a second activated carbon adsorption layer are sequentially installed at the upper end. A guide plate is fixed near the middle of the kettle body's interior, and a first filter plate and a second filter plate are sequentially installed at the lower end. Fixing plates are symmetrically fixed to the outer wall of the kettle body. By adding a buffer structure consisting of a connecting plate, a buffer spring, and a baffle, when the kettle body is impacted, the baffle is first subjected to force, and then the buffer spring contracts, generating a reverse elastic force that effectively buffers the impact force, thus effectively protecting the kettle body and preventing dents and damage. Furthermore, the buffer structure is installed by the cooperation of the fixing plate, slot, and insert, facilitating quick removal and installation.

[0003] However, the above-mentioned decolorization and purification device causes the mother liquor to flow through multiple layers of decolorization and filter packing under gravity, resulting in a low flow rate of the mother liquor and a low decolorization and purification efficiency. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a decolorization and purification device for sodium iso-VC intermediate primary product by centrifuging and pressurizing the mother liquor to improve the decolorization and purification efficiency.

[0005] This utility model discloses a decolorization and purification device for sodium isocyanate intermediates, comprising a decolorization chamber, an inlet pipe, and an outlet pipe. The decolorization chamber contains a purification chamber. The inlet and outlet pipes are mounted on the decolorization chamber. The inlet pipe connects to the upper right part of the purification chamber, and the outlet pipe connects to the lower left part. The device also includes an arc-shaped filter plate, a filter cylinder, multiple blades, and a drive motor. The arc-shaped filter plate is installed in the middle of the purification chamber. Multiple filter holes are provided on the side wall of the arc-shaped filter plate. Decolorization and purification filler is filled in the purification chamber located to the left of the arc-shaped filter plate. The filter cylinder is rotatably mounted on the right side of the purification chamber, concentrically aligned with the inlet pipe. Multiple filter holes are provided on the side wall of the filter cylinder. Decolorization and purification filler is filled inside the arc-shaped filter plate. Multiple blades are evenly installed circumferentially on the outer wall of the filter cylinder. The drive motor is installed below the decolorization chamber, and its output shaft is connected to the filter cylinder. During operation, sodium isocyanate intermediates are purified. The mother liquor of the intermediate sodium isocyanate is fed into the filter cartridge through the inlet pipe. The decolorizing and purifying packing material inside the filter cartridge performs a primary decolorization and purification of the mother liquor. The drive motor drives the filter cartridge and multiple blades to rotate, causing the mother liquor inside the filter cartridge to enter the right side of the purification chamber of the decolorization box under the action of centrifugal force through multiple filter holes. The filter cartridge drives multiple blades to rotate, and the multiple blades agitate and accelerate the mother liquor again, causing the mother liquor to enter the left side of the purification chamber of the decolorization box under the action of centrifugal force through multiple filter holes of the arc-shaped filter plate. This allows the decolorizing and purifying packing material to perform a secondary decolorization and purification of the mother liquor. The mother liquor after secondary decolorization and purification is discharged from the decolorization box through the outlet pipe. Compared with the existing technology, this method uses a filter cartridge and multiple blades to centrifuge and pressurize the mother liquor of the intermediate sodium isocyanate sodium, increasing the flow rate of the mother liquor and making the contact between the mother liquor and the decolorizing and purifying packing material more efficient, thereby improving the decolorization and purification efficiency.

[0006] Preferably, it also includes multiple adsorption resin balls, which are placed on the right side of the purification chamber of the decolorization box; the multiple adsorption resin balls are in full contact with the primary mother liquor of sodium iso-VC intermediate between the filter cartridge and the arc-shaped filter plate under the stirring of multiple blades, so that the primary mother liquor of sodium iso-VC intermediate is decolorized and adsorbed through the micropores of the multiple adsorption resin balls, thereby improving the decolorization efficiency.

[0007] Preferably, it also includes a partition plate, which is installed on the left side of the purification chamber of the decolorization box. The partition plate is located between the arc-shaped filter plate and the outlet pipe. The decolorization and purification packing material is filled between the arc-shaped filter plate and the partition plate. A gap is set between the upper end of the partition plate and the top wall of the decolorization box. The partition plate and the arc-shaped filter plate constrain and limit the decolorization and purification packing material. The mother liquor after decolorization and purification by the decolorization and purification packing material passes through the gap above the partition plate and is discharged through the outlet pipe, which forces the mother liquor to fully contact the decolorization and purification packing material and improves the purification and decolorization efficiency.

[0008] Preferably, it also includes a sampling tube and a transmittance sensor. The sampling tube is installed on the decolorization chamber, and the input end of the sampling tube extends into the purification chamber between the partition and the outlet tube. The transmittance sensor is installed in the purification chamber between the partition and the outlet tube. The sampling tube is used to extract the mother liquor sample between the partition and the outlet tube for detection and analysis. The transmittance sensor is used to detect the transmittance of the mother liquor between the partition and the outlet tube, and the decolorization effect of the mother liquor is judged by the transmittance.

[0009] Preferably, it also includes a reflux pipe and an exhaust pipe. One end of the reflux pipe extends into the interior of the liquid inlet pipe, and the other end of the reflux pipe is connected to the upper end of the exhaust pipe. The lower end of the exhaust pipe extends into the left side of the purification chamber of the decolorization box. When the filter cartridge and multiple blades rotate, a certain negative pressure is formed inside the filter cartridge. This negative pressure draws out the air from the left side of the purification chamber of the decolorization box through the reflux pipe and the exhaust pipe, thereby forming a certain negative pressure in the left side of the purification chamber of the decolorization box, further accelerating the flow rate of the mother liquor.

[0010] Preferably, the filter cartridge also includes a corrugated pipe and a pusher cylinder. The connection between the return pipe and the extraction pipe is provided with a corrugated pipe. The extraction pipe is slidably connected to the decolorization box. A wear-resistant seal is provided between the extraction pipe and the decolorization box. One end of the pusher cylinder is connected to the extraction pipe, and the other end of the pusher cylinder is connected to the decolorization box. When the transmittance sensor detects that the mother liquor decolorization is unqualified, the valves of the inlet pipe and the outlet pipe are closed. The pusher cylinder drives the extraction pipe to descend, so that the extraction pipe extends into the mother liquor between the outlet pipe and the partition. Under the negative pressure of the filter cartridge, the mother liquor is circulated through the extraction pipe, the corrugated pipe, and the return pipe for decolorization and purification, thereby improving the decolorization and purification effect.

[0011] Preferably, it also includes a gate, two lower pins, two upper pins, and two stop rods. An opening for loading and unloading is provided on the side wall of the decolorizing chamber, located between the arc-shaped filter plate and the partition. The lower end of the gate is hinged to the lower pin seat pin of the side wall of the decolorizing chamber via two lower pins, and the upper end of the gate is hinged to the upper pin seat pin of the side wall of the decolorizing chamber via two upper pins. Baffles are provided on the left and right sides of the gate, both extending into the purification chamber of the decolorizing chamber. Two stop rods are provided in the middle of each baffle. When the gate is opened, the two stop rods are blocked by the side wall of the decolorizing chamber. A sealing element is provided between the gate and the opening for loading and unloading of the decolorizing chamber. When removing the decolorizing and purifying packing material between the partition and the arc-shaped filter plate, pull out the two lower pins and flip the lower end of the gate outwards to open it, allowing the gate to rotate around the two upper pins. This creates a downward-opening channel, facilitating the discharge of the decolorizing and purifying packing material through the pick-and-place port and the gate guide. When refilling the decolorizing and purifying packing material, pull out the two upper pins and flip the upper end of the gate outwards to open it, allowing the gate to rotate around the two lower pins. This creates an upward-opening channel, facilitating the refilling and purifying packing material into the purification chamber of the decolorizing box through the pick-and-place port and the gate guide.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: by centrifuging and pressurizing the primary mother liquor of sodium iso-VC intermediate through filter cartridge and multiple blades, the flow rate of the primary mother liquor of sodium iso-VC intermediate is increased, making the contact between the primary mother liquor of sodium iso-VC intermediate and the decolorization and purification packing more efficient, thereby improving the decolorization and purification efficiency. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a front sectional view of the present invention; Figure 3 This is a structural schematic diagram of the gate in the closed state of this utility model; Figure 4 This is a schematic diagram of the structure of this utility model when the gate is open and the decolorizing and purifying filler is being filled; Figure 5 This is a schematic diagram of the structure of this utility model when the gate is open and the decolorizing and purifying filler is discharged; Figure 6 It is a structural diagram of the arc-shaped filter plate, filter cylinder, blades, drive motor and adsorption resin balls.

[0014] The following are labels in the attached diagram: 1. Decolorization box; 2. Inlet pipe; 3. Outlet pipe; 4. Arc-shaped filter plate; 5. Filter cylinder; 6. Blade; 7. Drive motor; 8. Adsorption resin ball; 9. Partition plate; 10. Sampling tube; 11. Transmittance sensor; 12. Return pipe; 13. Extraction pipe; 14. Corrugated pipe; 15. Push cylinder; 16. Gate; 17. Lower pin; 18. Upper pin; 19. Stop bar. Detailed Implementation

[0015] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. This utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of this utility model more thorough and complete. Example 1

[0016] like Figures 1 to 6As shown, a decolorization and purification device for sodium isocyanate intermediate includes a decolorization chamber 1, an inlet pipe 2, and an outlet pipe 3. The decolorization chamber 1 has a purification chamber inside. The inlet pipe 2 and outlet pipe 3 are installed on the decolorization chamber 1. The inlet pipe 2 communicates with the upper right part of the purification chamber of the decolorization chamber 1, and the outlet pipe 3 communicates with the lower left part of the purification chamber of the decolorization chamber 1. The device is characterized by further including an arc-shaped filter plate 4, a filter cylinder 5, multiple blades 6, and a drive motor 7. The arc-shaped filter plate 4 is installed in the middle of the purification chamber of the decolorization chamber 1, and multiple filter holes are provided on the side wall of the arc-shaped filter plate 4. The purification chamber of the decolorization box 1 on the left side of the arc-shaped filter plate 4 is filled with decolorizing and purification packing material 1. The filter cylinder 5 is rotatably installed on the right side of the purification chamber of the decolorization box 1. The filter cylinder 5 is concentrically aligned with the liquid inlet pipe 2. Multiple filter holes 2 are provided on the side wall of the filter cylinder 5. The decolorizing and purification packing material 2 is provided inside the arc-shaped filter plate 4. Multiple blades 6 are evenly installed on the outer wall of the filter cylinder 5. The drive motor 7 is installed below the decolorization box 1. The output shaft of the drive motor 7 is connected to the filter cylinder 5 for transmission. It also includes multiple adsorption resin balls 8, which are placed on the right side of the purification chamber of the decolorization box 1.

[0017] During operation, the mother liquor of sodium isocyanate intermediate is introduced into the filter cartridge 5 through the inlet pipe 2. The decolorizing and purifying packing material 2 inside the filter cartridge 5 performs primary decolorization and purification on the mother liquor. The drive motor 7 drives the filter cartridge 5 and multiple blades 6 to rotate, so that the mother liquor inside the filter cartridge 5 enters the right side of the purification chamber of the decolorization box 1 through multiple filter holes under the action of centrifugal force. The filter cartridge 5 drives the multiple blades 6 to rotate, and the multiple blades 6 agitate the mother liquor again to accelerate centrifugation. Multiple adsorption resin balls 8 are in full contact with the sodium isocyanate intermediate mother liquor between the filter cartridge 5 and the arc-shaped filter plate 4 under the agitation of the multiple blades 6, so that the sodium isocyanate intermediate is purified in one step. The mother liquor undergoes decolorization and adsorption through the micropores of multiple adsorption resin balls 8. Under centrifugal force, the mother liquor enters the left side of the purification chamber of the decolorization box 1 through multiple filter holes of the arc-shaped filter plate 4, allowing the decolorization and purification packing 2 to perform secondary decolorization and purification on the mother liquor. The mother liquor after secondary decolorization and purification is discharged from the decolorization box 1 through the outlet pipe 3. Compared with the existing technology, which uses filter cylinder 5 and multiple blades 6 to centrifuge and pressurize the primary mother liquor of sodium iso-VC intermediate, this technology increases the flow rate of the primary mother liquor of sodium iso-VC intermediate, making the contact between the primary mother liquor of sodium iso-VC intermediate and the decolorization and purification packing more efficient, thereby improving the decolorization and purification efficiency. Example 2

[0018] like Figure 1 , Figure 2 and Figure 4As shown, based on Embodiment 1, it also includes a partition 9, which is installed on the left side of the purification chamber of the decolorization box 1. The partition 9 is located between the arc-shaped filter plate 4 and the outlet pipe 3. The decolorization and purification packing is filled between the arc-shaped filter plate 4 and the partition 9. A gap is provided between the upper end of the partition 9 and the top wall of the decolorization box 1. It also includes a sampling tube 10 and a transmittance sensor 11. The sampling tube 10 is installed on the decolorization box 1. The input end of the sampling tube 10 extends into the purification chamber between the partition 9 and the outlet pipe 3. The transmittance sensor 11 is installed in the purification chamber between the partition 9 and the outlet pipe 3. The chamber also includes a return pipe 12 and an exhaust pipe 13. One end of the return pipe 12 extends into the interior of the liquid inlet pipe 2, and the other end of the return pipe 12 is connected to the upper end of the exhaust pipe 13. The lower end of the exhaust pipe 13 extends into the left side of the purification chamber of the decolorization box 1. The chamber also includes a corrugated pipe 14 and a pusher cylinder 15. The corrugated pipe 14 is provided at the connection between the return pipe 12 and the exhaust pipe 13. The exhaust pipe 13 is slidably connected to the decolorization box 1. A wear-resistant seal is provided between the exhaust pipe 13 and the decolorization box 1. One end of the pusher cylinder 15 is connected to the exhaust pipe 13, and the other end of the pusher cylinder 15 is connected to the decolorization box 1.

[0019] The partition 9 and the arc-shaped filter plate 4 constrain and limit the decolorization and purification packing material. After decolorization and purification by the packing material, the mother liquor enters the space between the partition 9 and the outlet pipe 3 through the gap above the partition 9, forcing the mother liquor to fully contact the decolorization and purification packing material. The sampling tube 10 is used to extract the mother liquor sample between the partition 9 and the outlet pipe 3 for testing and analysis. The transmittance sensor 11 is used to detect the transmittance of the mother liquor between the partition 9 and the outlet pipe 3, and the decolorization effect of the mother liquor is judged by the transmittance. When the filter cylinder 5 and multiple blades 6 rotate, a certain negative pressure is formed inside the filter cylinder 5. When the transmittance sensor 11 detects that the mother liquor decolorization is unqualified, the inlet pipe 2 and the outlet pipe 3 are closed. When the valve of pipe 3 is closed, the push cylinder 15 drives the suction pipe 13 to descend, so that the suction pipe 13 extends into the mother liquor between the liquid outlet pipe 3 and the partition 9. Under the negative pressure of the filter cartridge 5, the mother liquor is circulated and purified by the suction pipe 13, the corrugated pipe 14 and the return pipe 12. When the transmittance sensor 11 detects that the mother liquor is qualified for decolorization, the push cylinder 15 drives the suction pipe 13 to rise and separate from the mother liquor. The negative pressure of the filter cartridge 5 draws out the air in the left part of the purification chamber of the decolorization box 1 through the return pipe 12 and the suction pipe 13, so that a certain negative pressure is also formed in the left part of the purification chamber of the decolorization box 1, which further accelerates the flow speed of the mother liquor and improves the decolorization and purification effect. Example 3

[0020] like Figure 1 , Figure 4 and Figure 5As shown, based on Embodiment 1, it also includes a gate 16, two lower pins 17, two upper pins 18, and two stop rods 19. A pick-up / placement port is provided on the side wall of the decolorizing box 1, located between the arc-shaped filter plate 4 and the partition plate 9. The lower end of the gate 16 is hinged to the lower pin seat pin of the side wall of the decolorizing box 1 via the two lower pins 17, and the upper end of the gate 16 is hinged to the upper pin seat pin of the side wall of the decolorizing box 1 via the two upper pins 18. Baffles are provided on the left and right sides of the gate 16, both of which extend into the purification chamber of the decolorizing box 1. Two stop rods 19 are provided in the middle of each of the two baffles. When the gate 16 is opened, the two stop rods 19 are blocked by the side wall of the decolorizing box 1. A sealing element is provided between the gate 16 and the pick-up / placement port of the decolorizing box 1.

[0021] When it is necessary to remove the decolorizing and purifying packing material between the partition plate 9 and the arc-shaped filter plate 4, pull out the two lower pins 17 and flip the lower end of the gate 16 outward to open it, so that the gate 16 rotates around the two upper pins 18, thereby forming a downward-opening channel. The decolorizing and purifying packing material can be easily discharged through the pick-and-place port and the gate 16 guide. When it is necessary to fill the decolorizing and purifying packing material, pull out the two upper pins 18 and flip the upper end of the gate 16 outward to open it, so that the gate 16 rotates around the two lower pins 17, thereby forming an upward-opening channel. The decolorizing and purifying packing material can be easily filled into the purification chamber of the decolorizing box 1 through the pick-and-place port and the gate 16 guide.

[0022] like Figures 1 to 6 As shown, this utility model discloses a decolorization and purification device for sodium iso-VC intermediates. During operation, the sodium iso-VC intermediate mother liquor is first input into the filter cartridge 5 through the inlet pipe 2. The decolorization and purification packing material 2 inside the filter cartridge 5 performs a first-stage decolorization and purification of the mother liquor. Then, the drive motor 7 drives the filter cartridge 5 and multiple blades 6 to rotate, causing the mother liquor inside the filter cartridge 5 to enter the right side of the purification chamber of the decolorization box 1 under centrifugal force through multiple filter holes 2. The filter cartridge 5 drives the multiple blades 6 to rotate, and the multiple blades 6 further agitate and accelerate the mother liquor. Then, under centrifugal force, the mother liquor enters the left side of the purification chamber of the decolorization box 1 through multiple filter holes 1 of the arc-shaped filter plate 4, allowing the decolorization and purification packing material 2 to further decolorize and purify the mother liquor. The mother liquor undergoes secondary decolorization and purification. After decolorization and purification through the first decolorization and purification packing, it collects between the partition 9 and the outlet pipe 3 after passing through the gap above the partition 9. When the transmittance sensor 11 detects that the mother liquor decolorization is unqualified, the valves of the inlet pipe 2 and the outlet pipe 3 are closed, and the push cylinder 15 drives the suction pipe 13 to descend, so that the suction pipe 13 extends into the mother liquor between the outlet pipe 3 and the partition 9. Under the negative pressure of the filter cartridge 5, the mother liquor is circulated and decolorized and purified by passing through the suction pipe 13, the corrugated pipe 14 and the return pipe 12. Finally, when the transmittance sensor 11 detects that the mother liquor decolorization is qualified, the valves of the inlet pipe 2 and the outlet pipe 3 are opened, so that the decolorized and purified mother liquor is discharged from the decolorization box 1 through the outlet pipe 3.

[0023] The main functions achieved by this utility model are: 1. The mother liquor of sodium iso-VC intermediate is centrifuged, accelerated and pressurized by filter cartridge 5 and multiple blades 6, which increases the flow rate of the mother liquor of sodium iso-VC intermediate and makes the contact between the mother liquor of sodium iso-VC intermediate and the decolorization and purification packing more efficient, thereby improving the decolorization and purification efficiency. 2. The mother liquor of sodium iso-VC intermediate is decolorized and adsorbed by multiple adsorption resin balls 8, thereby improving the decolorization efficiency. 3. It can detect the mother liquor of sodium iso-VC intermediate and perform circulating decolorization and purification; 4. By setting gate 16, it is convenient to fill and discharge the decolorization and purification filler.

[0024] The decolorization and purification device for sodium iso-VC intermediate of this utility model uses common mechanical methods for installation, connection, or setting. Any method that can achieve the desired beneficial effect can be implemented. The components of the decolorization and purification device for sodium iso-VC intermediate of this utility model, including the decolorization box 1, inlet pipe 2, outlet pipe 3, arc-shaped filter plate 4, filter cylinder 5, blade 6, drive motor 7, adsorption resin ball 8, partition 9, sampling tube 10, light transmittance sensor 11, reflux pipe 12, exhaust pipe 13, corrugated pipe 14, push cylinder 15, gate 16, lower pin 17, upper pin 18, and stop bar 19, are commercially available. Technical personnel in this industry only need to install and operate it according to the accompanying instruction manual, without requiring any creative work from those skilled in the art.

[0025] All technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0026] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A decolorization and purification apparatus for a primary product of sodium isocyanate intermediate, comprising a decolorization chamber (1), an inlet pipe (2), and an outlet pipe (3), wherein a purification chamber is provided inside the decolorization chamber (1), the inlet pipe (2) and the outlet pipe (3) are installed on the decolorization chamber (1), the inlet pipe (2) is connected to the upper right part of the purification chamber of the decolorization chamber (1), and the outlet pipe (3) is connected to the lower left part of the purification chamber of the decolorization chamber (1); characterized in that, It also includes an arc-shaped filter plate (4), a filter cylinder (5), multiple blades (6) and a drive motor (7). The arc-shaped filter plate (4) is installed in the middle of the purification chamber of the decolorizing box (1). Multiple filter holes are provided on the side wall of the arc-shaped filter plate (4). The purification chamber of the decolorizing box (1) located to the left of the arc-shaped filter plate (4) is filled with decolorizing and purification packing material. The filter cylinder (5) is rotatably installed on the right side of the purification chamber of the decolorizing box (1). The filter cylinder (5) is concentrically aligned with the liquid inlet pipe (2). Multiple filter holes are provided on the side wall of the filter cylinder (5). The decolorizing and purification packing material is provided inside the arc-shaped filter plate (4). Multiple blades (6) are evenly installed on the outer wall of the filter cylinder (5). The drive motor (7) is installed below the decolorizing box (1). The output shaft of the drive motor (7) is connected to the filter cylinder (5) in a transmission.

2. The decolorization and purification apparatus for sodium iso-VC intermediate as described in claim 1, characterized in that, It also includes multiple adsorption resin balls (8), which are placed on the right side of the purification chamber of the decolorization box (1).

3. The decolorization and purification apparatus for sodium iso-VC intermediate as described in claim 1, characterized in that, It also includes a partition (9), which is installed on the left side of the purification chamber of the decolorization box (1). The partition (9) is located between the arc-shaped filter plate (4) and the liquid outlet pipe (3). The decolorization and purification packing is filled between the arc-shaped filter plate (4) and the partition (9). The upper end of the partition (9) is separated from the top wall of the decolorization box (1).

4. The decolorization and purification apparatus for sodium iso-VC intermediate as described in claim 3, characterized in that, It also includes a sampling tube (10) and a transmittance sensor (11). The sampling tube (10) is installed on the decolorization box (1). The input end of the sampling tube (10) extends into the purification chamber between the partition (9) and the outlet tube (3). The transmittance sensor (11) is installed in the purification chamber between the partition (9) and the outlet tube (3).

5. The decolorization and purification apparatus for sodium iso-VC intermediate as described in claim 3, characterized in that, It also includes a reflux pipe (12) and an exhaust pipe (13). One end of the reflux pipe (12) extends into the interior of the liquid inlet pipe (2), and the other end of the reflux pipe (12) is connected to the upper end of the exhaust pipe (13). The lower end of the exhaust pipe (13) extends into the left side of the purification chamber of the decolorization box (1).

6. The decolorization and purification apparatus for sodium iso-VC intermediate as described in claim 5, characterized in that, It also includes a bellows (14) and a pusher cylinder (15). The bellows (14) is provided at the connection between the return pipe (12) and the extraction pipe (13). The extraction pipe (13) is slidably connected to the decolorizing box (1). A wear-resistant seal is provided between the extraction pipe (13) and the decolorizing box (1). One end of the pusher cylinder (15) is connected to the extraction pipe (13), and the other end of the pusher cylinder (15) is connected to the decolorizing box (1).

7. The decolorization and purification apparatus for sodium iso-VC intermediate as described in claim 3, characterized in that, It also includes a gate (16), two lower pins (17), two upper pins (18) and two stop bars (19). The side wall of the decolorizing box (1) is provided with a pick-up and put-out port, which is located between the arc-shaped filter plate (4) and the partition plate (9). The lower end of the gate (16) is hinged to the lower pin seat pin of the side wall of the decolorizing box (1) through two lower pins (17). The upper end of the gate (16) is hinged to the upper pin seat pin of the side wall of the decolorizing box (1) through two upper pins (18). Baffles are provided on the left and right sides of the gate (16). Both baffles extend into the purification chamber of the decolorizing box (1). Two stop bars (19) are provided in the middle of both baffles. When the gate (16) is opened, the two stop bars (19) are blocked by the side wall of the decolorizing box (1). A sealing element is provided between the gate (16) and the pick-up and put-out port of the decolorizing box (1).

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