A stripping liquid rectification regeneration system and a regeneration method

Abstract

The present application relates to a kind of stripping liquid rectification regeneration system and regeneration method, it is related to stripping liquid regeneration technical field, including rectifying column, balance tank and vacuum unit, rectifying column top side is connected by being arranged drain pipe with balance tank, the rectifying column kettle section is connected with falling film evaporator;It further includes vaporizer by pipeline with rectifying column middle section position is connected, the feed end of vaporizer is connected with pre-processing component by pipeline;The pre-processing component includes processing tank and be in the ceramic filter of processing tank, electric rotating rod and preheater, the ceramic filter upper end is connected with electric rotating rod by transmission part, and transmission part both sides are symmetrically equipped with scale removal piece and scale removal piece, ceramic filter rotates under the drive of electric rotating rod, while driving scale removal piece and scale removal piece complete to the scale removal of ceramic filter upper end.The stripping liquid regeneration efficiency and effect of the present application are effectively improved.

Description

Technical Field

[0001] This invention belongs to the field of stripping fluid regeneration technology, specifically relating to a stripping fluid distillation regeneration system and regeneration method. Background Technology

[0002] Industrial stripping solutions are mostly mixtures of organic amines and polar solvents. Their main purpose is to remove photoresist from glass substrates through dissolution and swelling during the stripping process in panel manufacturing. Therefore, in addition to the organic solvents mentioned above, waste stripping solutions also contain a certain amount of photoresist, water, and other high-boiling-point impurities. Their common characteristics are: the waste liquid is blackish-brown, and apart from a small amount of photoresist and other impurities, most of it is stripping solution with recycling value.

[0003] Current processing technology mainly relies on distillation regeneration. Improving the heat transfer efficiency of distillation is key to improving the regeneration effect of stripping fluid. In addition, due to the residual photoresist in the stripping waste liquid during the distillation regeneration process, there are problems such as pipe blockage, scaling, and coking in the distillation system, which not only affect the regeneration effect but also hinder the normal operation of the equipment. Therefore, in-depth research on the recycling process of stripping fluid regeneration device to obtain a simple and effective treatment device is particularly important for the waste stripping fluid market. Summary of the Invention

[0004] The purpose of this invention is to provide a stripping fluid distillation and regeneration system and method to solve the above-mentioned problems.

[0005] The present invention achieves the above objectives through the following technical solutions:

[0006] This invention provides a stripping liquid distillation regeneration system, including a distillation column, a balance tank, and a vacuum unit. The top of the distillation column is connected to the balance tank via a drain pipe. The system is characterized in that a falling film evaporator is connected to the bottom section of the distillation column.

[0007] It also includes a vaporizer connected to the middle section of the distillation column via a pipeline, and the feed end of the vaporizer is connected to a pretreatment component via a pipeline;

[0008] The pretreatment assembly includes a treatment tank and a ceramic filter element, an electric rotating rod, and a preheater disposed inside the treatment tank. The upper end of the ceramic filter element is connected to the electric rotating rod through a transmission component, and a scraping component and a descaling component are symmetrically arranged on both sides of the transmission component. The ceramic filter element rotates under the drive of the electric rotating rod, which simultaneously drives the scraping component and the descaling component to complete the scraping and descaling of the upper end of the ceramic filter element.

[0009] As a further optimization of the present invention, the bottom end of the balance tank is connected to a regenerated liquid conveying pipe, and the upper end of the balance tank is connected to a venting valve and a nitrogen conveying pipe. The vacuum unit is connected to the balance tank and the distillation column through pipelines.

[0010] As a further optimization of the present invention, the transmission component includes a transmission seat and magnetic blocks symmetrically arranged on both sides of the outer wall of the transmission seat. One end of the scraping component and the descaling component is provided with a magnetic plate corresponding to the magnetic block, and the other end is movably inserted with a sealing seat fixed to the treatment tank. The magnetic blocks and the magnetic plates have the same magnetism.

[0011] As a further optimization of the present invention, the scraping component includes a horizontal shaft and a scraper disposed at the lower end of the horizontal shaft.

[0012] As a further optimization of the present invention, the descaling component includes a hollow tube, a connecting pipe connected to the hollow tube and movably penetrating through the sealing seat, and a suction pump connected by a flexible connector, wherein a flow guide is connected through the lower end of the hollow tube.

[0013] As a further optimization of the present invention, the sealing seat includes a plug seat fixed on the processing tank. One end of the plug seat located inside the processing tank is provided with a sealed bearing for the horizontal shaft or connecting pipe to be movably inserted. The interior of the plug seat is provided with a spring member connected to the horizontal shaft or connecting pipe.

[0014] As a further optimization of the present invention, a sleeve is provided at the suction port of the suction pump and an hourglass-shaped baffle is provided inside the sleeve. The side of the hourglass-shaped baffle near the treatment tank is hollowed out, and a return pipe connected to the treatment tank is provided at the lower end of the sleeve corresponding to the waist position of the hourglass-shaped baffle.

[0015] The present invention also provides a method for regenerating stripping fluid using any of the systems described above, comprising the following steps:

[0016] S1. The stripping waste liquid is fed into the pretreatment component and filtered through the ceramic filter to obtain a primary filtrate free of particulate impurities and photoresist. The primary filtrate is accumulated at the bottom of the treatment tank and preheated using a preheater.

[0017] S2. The preheated primary filtrate is transported through pipeline to the vaporizer for vaporization to form material steam.

[0018] S3. Material vapor is introduced from the middle section of the distillation column through the pipeline. The material vapor passes upward through the packing inside the column. The light component gaseous material after passing through the packing is discharged from the top of the column and condensed into liquid in the distillation column condenser. It is then transported to the balance tank for collection through the drain pipe to obtain stripping regenerated liquid. The regenerated liquid is pumped to the tank area for storage through the regenerated liquid delivery pipe. The material in the bottom of the distillation column falls into the falling film evaporator for evaporation. The heavy component material is scraped off by the rotating scraper structure of the falling film evaporator to avoid scaling.

[0019] As a further optimization of the present invention, in step S3, the distillation column reflux pump refluxes a portion of the liquid material back to the liquid material refluxed in the distillation column, and the light component gaseous material generated by evaporation in the falling film evaporator transfers heat and mass upward with the liquid material in the packing inside the column.

[0020] The beneficial effects of this invention are as follows:

[0021] (1) In this invention, the primary filtrate is first preheated and then vaporized in a vaporizer to form material steam. After being fed tangentially from the middle section of the distillation column, the heat and mass transfer efficiency can be effectively enhanced, and the water and other impurities remaining in the previous process can be further removed to achieve the effect of refining and purification.

[0022] (2) The stripping waste liquid of the present invention removes most of the particulate impurities and photoresist through primary separation, and then scrapes them off in time with the rotating scraping structure of the falling film evaporator. This not only helps to improve the efficiency of the subsequent distillation process, but also effectively solves the problems of pipe blockage and coking caused by the presence of photoresist in the stripping waste liquid. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the internal structure of the preprocessing component provided by the present invention;

[0025] Figure 3 Provided by the present invention Figure 2 Enlarged view of the structure of section A in the middle;

[0026] Figure 4 This is a schematic diagram of the structure of the transmission component provided by the present invention;

[0027] In the diagram: 1. Distillation column; 2. Falling film evaporator; 3. Pretreatment assembly; 31. Processing tank; 32. Ceramic filter element; 33. Electric rotary rod; 34. Transmission base; 35. Magnetic block; 4. Vaporizer; 5. Drain pipe; 6. Balance tank; 7. Regenerated liquid conveying pipe; 8. Vacuum unit; 9. Preheater; 10. Horizontal shaft; 11. Sealing connector; 111. Insert connector; 112. Sealed bearing; 113. Spring element; 12. Magnetic plate; 13. Scraper; 14. Hollow tube; 15. Connecting pipe; 16. Suction pump; 17. Flow guide hood; 18. Hourglass-shaped baffle; 19. Return pipe. Detailed Implementation

[0028] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0029] Example 1

[0030] like Figure 1-2 As shown, a stripping liquid distillation regeneration system includes a distillation column 1, a balance tank 6, and a vacuum unit 8. The top side of the distillation column 1 is connected to the balance tank 6 through a drain pipe 5. The bottom section of the distillation column 1 is connected to a falling film evaporator 2.

[0031] It also includes a vaporizer 4 connected to the middle section of the distillation column 1 via a pipeline, and the feed end of the vaporizer 4 is connected to a pretreatment component 3 via a pipeline;

[0032] The pretreatment component 3 includes a treatment tank 31 and a ceramic filter element 32, an electric rotating rod 33, and a preheater 9 disposed in the treatment tank 31. The upper end of the ceramic filter element 32 is connected to the electric rotating rod 33 through a transmission component, and a scraping component and a descaling component are symmetrically arranged on both sides of the transmission component. The ceramic filter element 32 rotates under the drive of the electric rotating rod 33, and at the same time drives the scraping component and the descaling component to complete the scraping and descaling of the upper end of the ceramic filter element 32.

[0033] The bottom of the balance tank 6 is connected to the regenerated liquid delivery pipe 7, and the top of the balance tank 6 is connected to the vent valve and the nitrogen delivery pipe. The vacuum unit 8 is connected to the balance tank 6 and the distillation column 1 through pipelines.

[0034] Furthermore, such as Figure 3-4 As shown, the transmission component includes a transmission seat 34 and magnetic blocks 35 symmetrically arranged on both sides of the outer wall of the transmission seat 34. One end of the scraping component and the descaling component is provided with a magnetic plate 12 corresponding to the magnetic block 35, and the other end is movably inserted with a sealing seat 11 fixed to the treatment tank 31. The magnetic blocks 35 and the magnetic plates 12 have the same magnetism. The scraping component includes a horizontal shaft 10 and a scraper 13 provided at the lower end of the horizontal shaft 10.

[0035] The descaling component includes a hollow tube 14, a connecting pipe 15 connected to the hollow tube 14 and movably passing through the sealing seat 11, and a suction pump 16 connected by a flexible connector. A flow guide shroud 17 is connected through the lower end of the hollow tube 14.

[0036] In practical applications, when it is necessary to periodically descale the ceramic filter element 32 in the treatment tank 31, the electric rotary rod 33 drives the ceramic filter element 32 to rotate at a constant speed. At this time, the transmission seat 34 installed at the center of the upper end face of the ceramic filter element 32 also rotates accordingly, and the magnetic block 35 on the transmission seat 34 also rotates accordingly. At this time, the magnetic block 35 and the magnetic plate 12 have the same magnetism. When the magnetic block 35 rotates to the position corresponding to the magnetic plate 12 connected to the horizontal axis 10, the two repel each other due to magnetism, and the horizontal axis 10 moves away from the magnetic block 35. Displacement occurs when the rear end of the horizontal shaft 10 slides relative to the sealing seat 11. Similarly, when the position of the transmission seat 34 without the magnetic block 35 rotates to correspond to the position of the magnetic plate 12 connected to the horizontal shaft 10, the magnetic plate 12 loses the repulsive force given by the magnetic block 35, and the horizontal shaft 10 will reset accordingly. Thus, it can be seen that the scraper 13 connected to the lower end of the horizontal shaft 10 scrapes off the dirt on the ceramic filter element 32 as it rotates, and moves left and right with the horizontal shaft 10 to scrape off the dirt on the ceramic filter element 32 over a larger area.

[0037] Meanwhile, when the suction pump 16 starts, the suction force generated is conducted through the connecting pipe 15 to the hollow tube 15, and guided by the guide shroud 17, adsorbing the dirt scraped off the ceramic filter element 32, and discharging it through the hollow tube 14 and the connecting pipe 15. Additionally, when the magnetic block 35 rotates to correspond to the position of the magnetic plate 12 connected to the hollow tube 14, the two repel each other magnetically, causing the hollow tube 14 to displace away from the magnetic block 35. The connecting pipe 15 connected to the rear end of the hollow tube 14 then slides relative to the sealing seat 11. Similarly, when the transmission seat... When the position of the non-magnetic block 35 on the hollow tube 14 rotates to correspond with the position of the magnetic plate 12 connected to the hollow tube 14, the magnetic plate 12 loses the repulsive force given by the magnetic block 35, and the hollow tube 14 will reset accordingly. It can be seen that the guide shroud 17 connected to the lower end of the hollow tube 14 absorbs the dirt on the ceramic filter element 32 as it rotates, and moves left and right with the hollow tube 14 to absorb the dirt on the ceramic filter element 32 over a larger area. The treatment effect and efficiency of scraping and descaling the ceramic filter element 32 are improved.

[0038] Furthermore, the suction port of the suction pump 16 is provided with a sleeve and an hourglass-shaped baffle 18 is provided inside the sleeve. The side of the hourglass-shaped baffle 18 near the treatment tank 31 is hollowed out. The lower end of the sleeve is provided with a return pipe 19 connected to the treatment tank 31 at the waist position of the hourglass-shaped baffle 18. After the dirt discharged through the connecting pipe 15 enters the sleeve, with the suction action of the suction pump 16 and the squeezing action of the dirt when the connecting pipe 15 and the sealing seat 11 slide relative to each other, the residual stripping waste liquid in the dirt enters through the hollow side of the hourglass-shaped baffle 18 and flows back to the treatment tank 31 through the return pipe 19, reducing losses.

[0039] Furthermore, the sealing seat 11 includes a plug seat 111 fixed on the processing tank 31. The plug seat 111 and the processing tank 31 are sealed to ensure the airtightness of the processing tank 31. One end of the plug seat 111 located inside the processing tank 31 is provided with a sealed bearing 112 for the horizontal shaft 10 or the connecting pipe 15 to be movably inserted. The interior of the plug seat 111 is provided with a spring member 113 connected to the horizontal shaft 10 or the connecting pipe 15. When the horizontal shaft 10 or the connecting pipe 15 slides relative to the sealing seat 11, the horizontal shaft 10 or the connecting pipe 15 presses the spring member 113 to compress it. When the horizontal shaft 10 or the connecting pipe 15 returns to its original position, the elastic action of the spring member 113 can assist the horizontal shaft 10 or the connecting pipe 15 to return to its original position quickly.

[0040] Example 2

[0041] Based on Example 1, the present invention also provides a method for purifying tetrahydrofuran using an electrolyte with any of the above-described apparatus, comprising the following steps:

[0042] S1. The stripping waste liquid is fed into the pretreatment component 3 and filtered through the ceramic filter element 32 to obtain a primary filtrate free of particulate impurities and photoresist. The primary filtrate is accumulated at the lower end of the treatment tank 31 and preheated using the preheater 9.

[0043] S2. The preheated primary filtrate is transported through pipeline to vaporizer 4 for vaporization to form material steam.

[0044] S3. Material vapor is introduced from the middle section of distillation column 1 through pipeline. The material vapor passes upward through the packing inside the column. The light component gaseous material after passing through the packing is discharged from the top of the column and condensed into liquid in the condenser of distillation column 1. It is then transported to the balance tank 6 through the drain pipe 5 to obtain stripping regeneration liquid. The regeneration liquid is pumped to the tank area for storage through the regeneration liquid conveying pipe 7. The material in the bottom of distillation column 1 falls into the falling film evaporator 2 for evaporation. The heavy component material is scraped off by the rotating scraper structure of the falling film evaporator 2 to avoid scaling. The reflux pump of distillation column 1 returns a portion of the liquid material to the reflux liquid material of distillation column 1. The light component gaseous material generated by evaporation in the falling film evaporator 2 transfers heat and mass with the liquid material upward in the packing inside the column.

[0045] The present invention uses the pretreatment component 3 to achieve primary filtration and separation of stripping waste liquid through ceramic filter element 32 to obtain primary filtrate. Particulate impurities and photoresist accumulate on the upper surface of ceramic filter element 32. As ceramic filter element 32 rotates under the drive of electric rotating rod 33, the scraping and descaling components are driven to complete the scraping and descaling of the upper end of ceramic filter element 32.

[0046] Subsequently, the primary filtrate is preheated and then vaporized in vaporizer 4 to form material steam. After being fed tangentially from the middle section of distillation column 1, it can effectively enhance heat and mass transfer efficiency, and further remove water and other impurities that may be present in the previous process, thus achieving the effect of refining and purification.

[0047] In addition, the material from the bottom of the distillation column 1 falls into the falling film evaporator 2 for evaporation. The heavy components are scraped off by the rotating scraping structure of the falling film evaporator 2. The stripping waste liquid removes most of the particulate impurities and photoresist after primary separation. In addition, the rotating scraping structure of the falling film evaporator 2 achieves thermal separation while scraping away the heavy components attached to the bottom of the distillation column 1 to prevent scaling. This effectively solves the problems of pipe blockage and coking caused by the presence of photoresist in the stripping waste liquid.

[0048] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A stripping fluid distillation regeneration system, comprising a distillation column (1), a balance tank (6), and a vacuum unit (8), wherein the top of the distillation column (1) is connected to the balance tank (6) via a drain pipe (5), characterized in that: The bottom section of the distillation column (1) is connected to a falling film evaporator (2), and the vacuum unit (8) is connected to the balance tank (6) and the distillation column (1) through pipelines; It also includes a vaporizer (4) connected to the middle section of the distillation column (1) via a pipeline, and the feed end of the vaporizer (4) is connected to a pretreatment component (3) via a pipeline. The pretreatment component (3) includes a treatment tank (31) and a ceramic filter element (32), an electric rotating rod (33) and a preheater (9) disposed in the treatment tank (31). The upper end of the ceramic filter element (32) is connected to the electric rotating rod (33) through a transmission component. The transmission component is symmetrically provided with a scraping component and a descaling component on both sides. The ceramic filter element (32) rotates under the drive of the electric rotating rod (33), and at the same time drives the scraping component and the descaling component to complete the scraping and descaling of the upper end of the ceramic filter element (32). The transmission component includes a transmission seat (34) and magnetic blocks (35) symmetrically arranged on both sides of the outer wall of the transmission seat (34). One end of the scraping component and the descaling component is provided with a magnetic plate (12) corresponding to the magnetic block (35), and the other end is movably inserted with a sealing seat (11) fixed to the treatment tank (31). The magnetic blocks (35) and the magnetic plates (12) have the same magnetism. The scraping component includes a horizontal shaft (10) and a scraper (13) located at the lower end of the horizontal shaft (10). The descaling component includes a hollow tube (14), a connecting tube (15) connected to the hollow tube (14) and movably passing through the sealing seat (11), and a suction pump (16) connected by a flexible connector. The lower end of the hollow tube (14) is connected to a flow guide (17). The sealing seat (11) includes a plug seat (111) fixed on the treatment tank (31). The plug seat (111) is provided with a spring (113) inside which is connected to the horizontal shaft (10) or the connecting tube (15). The suction pump (16) has a sleeve at the suction port and an hourglass-shaped baffle (18) inside the sleeve. The side of the hourglass-shaped baffle (18) near the treatment tank (31) is hollowed out. The lower end of the sleeve is provided with a return pipe (19) connected to the treatment tank (31) at the waist position of the hourglass-shaped baffle (18).

2. The stripping fluid distillation and regeneration system according to claim 1, characterized in that: The bottom of the balance tank (6) is connected to a regenerated liquid delivery pipe (7), and the top of the balance tank (6) is connected to a venting valve and a nitrogen delivery pipe.

3. The stripping fluid distillation and regeneration system according to claim 1, characterized in that: The plug-in socket (111) is provided with a sealed bearing (112) at one end inside the processing tank (31) for the horizontal shaft (10) or connecting pipe (15) to be movably plugged in.

4. A method for regenerating the stripping fluid using the system as described in any one of claims 1-3, characterized in that: Includes the following steps: S1. The stripping waste liquid is fed into the pretreatment component (3) and filtered through the ceramic filter element (32) to obtain a primary filtrate free of particulate impurities and photoresist. The primary filtrate is stored at the bottom of the treatment tank (31) and preheated using the preheater (9). S2. The preheated primary filtrate is transported through pipeline to vaporizer (4) for vaporization to form material steam. S3. Material vapor is introduced from the middle section of the distillation column (1) through the pipeline. The material vapor passes upward through the packing inside the column. The light component gaseous material after passing through the packing is discharged from the top of the column and condensed into liquid in the condenser of the distillation column (1). It is then transported to the balance tank (6) through the drain pipe (5) to obtain stripping regeneration liquid. It is pumped to the tank area for storage through the regeneration liquid conveying pipe (7). The material in the bottom of the distillation column (1) falls into the falling film evaporator (2) for evaporation. The heavy component material is scraped off by the rotating scraping structure of the falling film evaporator (2) to avoid scaling.

5. The method for regenerating the stripping fluid according to claim 4, characterized in that, In step S3, the reflux pump of the distillation column (1) refluxes a portion of the liquid material back to the liquid material refluxed in the distillation column (1). The light component gaseous material generated by evaporation in the falling film evaporator (2) transfers heat and mass with the liquid material in the packing inside the column.

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