A purification and regeneration device and regeneration method in lactitol production process

Abstract

The invention belongs to the technical field of lactitol production, and provides a purification and regeneration device and a regeneration method in a lactitol production process. The purification and regeneration device comprises an ion exchange column, one end of which is connected with a sewage pipe and a backwashing water inlet pipe, and the other end of which is connected with a desalted water inlet pipe and a regeneration agent feed pipe; the ion exchange column is connected with a temporary storage cylinder through a connecting pipe, so as to solve the technical problem that the resin cannot be completely regenerated due to repeated use of the regeneration agent in the prior art, thereby affecting its exchange capacity. The invention realizes repeated recycling of the low-concentration regeneration agent by mixing a set volume of high-concentration regeneration agent with a low-concentration regeneration agent in a modulation cylinder and finally forming a regeneration agent of a set concentration, thereby ensuring that the concentration of the flushing regeneration agent is the set concentration. The invention can be widely used in operation scenarios for reducing solution consumption.

Description

Technical Field

[0001] The invention belongs to the technical field of lactitol production, and in particular relates to a purification and regeneration device and a regeneration method in the lactitol production process. Background Art

[0002] In the production process of lactitol, liquid lactitol needs to go through an ion exchange process to remove some metal ions in the material to achieve the purpose of purification. After the resin filled in the ion exchange column is saturated with adsorption, it needs to be regenerated with a regeneration agent.

[0003] The traditional regeneration process consumes a large amount of regeneration agent and desalted water. At the same time, before reaching the concentration required by the process, this part of water is directly discharged to the sewage station through the sewer. This water contains a low concentration of regeneration agent, which pollutes the environment. In response to the above technical problems, a Chinese patent with patent publication number CN216605283U discloses a purification and regeneration device in the production process of lactitol. When in use, the used low-concentration regeneration agent is injected into the hydraulic ejector again for reuse, thereby reducing the consumption of the regeneration agent. However, the regeneration agent will gradually lose its effectiveness after reacting with the resin. If it is used again, the resin may not be fully regenerated, affecting its exchange capacity and affecting subsequent production and use. Summary of the invention

[0004] The purpose of the present invention is to provide a purification and regeneration device and a regeneration method in the production process of lactitol, aiming to solve the technical problem in the prior art that the resin cannot be completely regenerated due to repeated use of the regeneration agent, thereby affecting its exchange capacity.

[0005] The present invention is achieved in this way: a purification and regeneration device in the lactitol production process comprises an ion exchange column, one end of which is connected to a sewage discharge pipe and a backwash water inlet pipe, and the other end of which is connected to a desalted water inlet pipe and a regeneration agent feed pipe;

[0006] The ion exchange column is connected to a temporary storage cylinder through a connecting pipe, the temporary storage cylinder is connected to a modulation cylinder and the regeneration agent in the temporary storage cylinder is transported into the modulation cylinder, the temporary storage cylinder is connected to a high-concentration regeneration agent cylinder and the high-concentration regeneration agent in the high-concentration regeneration agent cylinder is transported into the temporary storage cylinder, the modulation cylinder is connected to a third material pump, the third material pump is connected to a reflux pipe and the reflux pipe is connected to the ion exchange column, and a regeneration agent concentration sensor is arranged in the modulation cylinder.

[0007] Further technical solution: A first material pump is fixedly installed on the temporary storage cylinder and is connected to a first metering pipe, which is connected to the modulation cylinder and is provided with a first flow meter. The first material pump extracts the low-concentration regeneration agent in the temporary storage cylinder and transports it to the modulation cylinder.

[0008] Further technical solution: A second material pump is fixedly installed on the high-concentration regeneration agent barrel and the second material pump is connected to a second metering pipe, the second metering pipe is connected to the modulation barrel and a second flow meter is arranged on the second metering pipe, the second material pump extracts the high-concentration regeneration agent in the high-concentration regeneration agent barrel and transports it to the modulation barrel.

[0009] Further technical solution: a telescopic part is fixedly installed on the modulation cylinder, a lifting plate is fixedly installed on the output end of the telescopic part, a vertical pipe is rotatably installed on the lifting plate, the vertical pipe is coaxially arranged with the modulation cylinder, the vertical pipe extends into the modulation cylinder and the vertical pipe is provided with a first support plate and a second support plate located in the modulation cylinder, and a power module for driving the vertical pipe to rotate is provided on the lifting plate.

[0010] Further technical solution: The end of the vertical pipe is rotatably connected with a connecting cylinder, the connecting cylinder is connected to the second metering pipe, the connecting cylinder is connected to a high-pressure air pump fixedly installed on the modulation cylinder, and the vertical pipe is connected to multiple groups of spray pipes.

[0011] Further technical solution: the first support plate is fixedly mounted on the vertical tube, the second support plate is slidably mounted on the vertical tube, the first support plate and the second support plate are provided with arc-shaped grooves arranged at intervals, an electromagnet is fixedly mounted on the first support plate, and a permanent magnet corresponding to the position of the electromagnet is fixedly mounted on the second support plate, and after the second support plate moves downward and contacts with the first support plate, all the grooves on the two support plates are covered.

[0012] Further technical solution: a plurality of groups of baffles with annular structures are fixedly installed in the modulation cylinder, the baffles are spaced apart from the first support plate, and the first support plate contacts the baffles after moving downward.

[0013] Further technical solution: the regeneration agent concentration sensors are provided in multiple groups and the multiple groups of regeneration agent concentration sensors are spaced apart from the baffle.

[0014] The present invention also provides a purification and regeneration method in a lactitol production process, which is applied to the purification and regeneration device in the lactitol production process described above, and comprises the following steps:

[0015] Step S1: deionized water enters the lower end of the ion exchange column through the backwash inlet pipe for backwashing, and the flowing water loosens the resin and removes the broken particles and impurities, and the sewage is discharged from the upper drain pipe (not shown);

[0016] Step S2: injecting a regenerant of a set concentration from the upper end of the ion exchange column through the regenerant feed pipe, and the liquid in the ion exchange column flows out from the drain pipe. The liquid flowing out of the drain pipe is tested for the regenerant. When the regenerant is detected, the valve on the drain pipe is closed and the valve on the connecting pipe is opened, so that the low-concentration regenerant flows into the temporary storage cylinder through the connecting pipe.

[0017] Step S3: extracting the regeneration agent in the temporary storage cylinder through the first material pump and delivering it to the modulation cylinder through the first metering tube, detecting the volume of the regeneration agent delivered to the modulation cylinder through the first flow meter, and detecting the concentration of the regeneration agent in the modulation cylinder through the regeneration agent concentration sensor;

[0018] Step S4: Calculate the volume of the high-concentration regenerant according to the detected concentration value and volume of the low-concentration regenerant and the concentration of the high-concentration regenerant, and then extract the regenerant in the high-concentration regenerant barrel through the second material pump and deliver it to the modulation barrel;

[0019] Step S5: the modulated regeneration agent is extracted by the third material pump and transported to the ion exchange column, and the injection of the regeneration agent from the regeneration agent feed pipe into the ion exchange column is stopped;

[0020] Step S6: When the regeneration agent concentration sensor detects that the concentration of the regeneration agent extracted from the temporary storage cylinder is the same as the set concentration, deionized water is injected into the deionization column from the deionized water inlet pipe, and the sewage is discharged from the sewage pipe.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The volume of high-concentration regenerant is calculated based on the detected concentration value and volume of the low-concentration regenerant and the concentration of the high-concentration regenerant. Then, the set volume of high-concentration regenerant is mixed with the low-concentration regenerant in the modulation cylinder to finally form a regenerant of the set concentration. Finally, the resin is flushed with the prepared regenerant to achieve repeated recycling of the low-concentration regenerant, thereby reducing the consumption of the regenerant. At the same time, the flushing regenerant concentration is guaranteed to be the set concentration through preparation, thereby ensuring the effect of resin regeneration.

[0023] 2. The telescopic member drives the vertical tube to move up and down, thereby causing the first support plate, the second support plate and the spray pipe to move up and down. At the same time, the vertical tube is driven to rotate continuously by the power module. The rotation of the first support plate and the second support plate can stir the regeneration agent in the modulation cylinder, thereby accelerating the mixing of regeneration agents of different concentrations. The vertical movement and rotation of the spray pipe can directly distribute the high-concentration regeneration agent to different areas of the low-concentration regeneration agent to the maximum extent, further reducing the mixing time of regeneration agents of different concentrations and increasing the mixing speed of regeneration agents of different concentrations.

[0024] 3. When the first support plate and the second support plate move back and forth up and down, the first support plate and the second support plate can push the regeneration agent in front of the moving direction to flow, and the regeneration agent can pass through the first support plate and the second support plate through the grooves on the first support plate and the second support plate, thereby enabling the regeneration agent in the modulation cylinder to move in the vertical direction, further improving the fluidity of the regeneration agent and increasing the direction of the regeneration agent flow, further improving the effect of mixing regeneration agents of different concentrations, and enabling the regeneration agent in the modulation cylinder to quickly reach the set concentration.

[0025] 4. The regenerant in the modulation cylinder can be separated by multiple groups of first support plates, second support plates and baffles. Since the separated area is full of regenerant, the flowing and agitated regenerant will quickly tend to a stable state. The regenerant after stirring and mixing can quickly stabilize, reducing the waiting time for regenerant concentration detection and ensuring the accuracy of regenerant concentration detection.

[0026] 5. When the second material pump delivers the regenerant into the modulation cylinder, the high-pressure air pump delivers air into the vertical pipe through the connecting cylinder. At this time, the speed of spraying the high-concentration regenerant into the low-concentration regenerant can be further accelerated under the action of air pressure, so that the high-concentration regenerant can flow a longer distance in the low-concentration regenerant, further improve the distribution range of the high-concentration regenerant in the low-concentration regenerant, and further accelerate the mixing speed of regenerants of different concentrations. When the high-concentration regenerant reaches the set volume, the valve on the lowest injection pipe is kept open, and the valves on other injection pipes are closed. Under air pressure, the high-concentration regenerant remaining in the vertical pipe will be pushed downward and sprayed out through the lowest injection pipe, so that all the high-concentration regenerants can leave the vertical pipe, ensuring the accuracy of the volume of the high-concentration regenerant, thereby improving the accuracy of the concentration of the mixed regenerant. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0028] Figure 2 It is a schematic diagram of the structure of the modulation cylinder in the present invention.

[0029] Figure 3 for Figure 2 A magnified schematic diagram of the A1 region in the middle.

[0030] Figure 4 It is a schematic diagram of the structure inside the modulation cylinder in the present invention.

[0031] Figure 5 It is a schematic structural diagram of the second support plate in the present invention.

[0032] Figure 6 It is a schematic structural diagram of the first support plate in the present invention.

[0033] In the attached drawings: 1. Ion exchange column; 2. Drain pipe; 3. Backwash water inlet pipe; 4. Desalted water inlet pipe; 5. Regeneration agent feed pipe; 6. Connecting pipe; 7. Temporary storage cylinder; 8. First material pump; 9. First metering pipe; 10. First flow meter; 11. Modulation cylinder; 12. High-concentration regeneration agent cylinder; 13. Second material pump; 14. Second metering pipe; 15. Second flow meter; 16. Third material pump; 17. Reflux pipe; 18. Telescopic member; 19. Lifting plate; 20. Vertical pipe; 21. Connecting cylinder; 22. Power module; 23. High-pressure air pump; 24. First support plate; 25. Second support plate; 26. Electromagnet; 27. Spraying pipe; 28. Regeneration agent concentration sensor; 29. ​​Baffle; 30. Permanent magnet. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0035] The specific implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0036] like Figure 1-Figure 2 As shown, a purification and regeneration device in the lactitol production process provided by the present invention comprises an ion exchange column 1, one end of the ion exchange column 1 is connected with a sewage discharge pipe 2 and a backwash water inlet pipe 3, and the other end of the ion exchange column 1 is connected with a deionized water inlet pipe 4 and a regeneration agent feed pipe 5;

[0037] The ion exchange column 1 is connected to the temporary storage cylinder 7 through the connecting pipe 6, the temporary storage cylinder 7 is connected to the modulation cylinder 11, and the regeneration agent in the temporary storage cylinder 7 is transported to the modulation cylinder 11. A first material pump 8 is fixedly installed on the temporary storage cylinder 7 and the first material pump 8 is connected to the first metering pipe 9, the first metering pipe 9 is connected to the modulation cylinder 11 and a first flow meter 10 is arranged on the first metering pipe 9. The first material pump 8 extracts the low-concentration regeneration agent in the temporary storage cylinder 7 and transports it to the modulation cylinder 11. The temporary storage cylinder 7 is connected to the high-concentration regeneration agent cylinder 12 and the high-concentration regeneration agent cylinder 12 is filled with a first material pump 8. The high-concentration regeneration agent is transported to the temporary storage cylinder 7, a second material pump 13 is fixedly installed on the high-concentration regeneration agent cylinder 12, and the second material pump 13 is connected to a second metering pipe 14, the second metering pipe 14 is connected to the modulation cylinder 11, and a second flow meter 15 is arranged on the second metering pipe 14, the second material pump 13 extracts the high-concentration regeneration agent in the high-concentration regeneration agent cylinder 12 and transports it to the modulation cylinder 11, the modulation cylinder 11 is connected to a third material pump 16, the third material pump 16 is connected to a reflux pipe 17, and the reflux pipe 17 is connected to the ion exchange column 1.

[0038] In actual application of this embodiment, first, deionized water enters from the lower end of the ion exchange column 1 through the backwash inlet pipe 3 for backwashing, and the flowing water loosens the resin and removes the broken particles and impurities, and the sewage is discharged from the upper emptying pipe (not shown), and then the regeneration agent of the set concentration is injected from the upper end of the ion exchange column 1 through the regeneration agent feed pipe 5, and the regeneration agent flows downward and acts on the resin to restore the activity of the resin. At this time, the liquid in the ion exchange column 1 flows out from the sewage pipe 2, and the regeneration agent is detected for the liquid flowing out of the sewage pipe 2. When the regeneration agent is detected, the valve on the sewage pipe 2 is closed and the valve on the connecting pipe 6 is opened, so that the low-concentration regeneration agent flows into the temporary storage cylinder 7 through the connecting pipe 6;

[0039] While maintaining the injection of the regenerant, the first material pump 8 extracts the regenerant in the temporary storage cylinder 7 and delivers it to the modulation cylinder 11 through the first metering pipe 9. The volume of the regenerant delivered to the modulation cylinder 11 is detected by the first flowmeter 10. After delivering the set volume of regenerant to the modulation cylinder 11, the flowmeter stops. At this time, the concentration of the regenerant in the modulation cylinder 11 is detected by the regenerant concentration sensor 28. The volume of the high-concentration regenerant required is calculated based on the detected concentration value and volume of the low-concentration regenerant and the concentration of the high-concentration regenerant. Then, the second material pump 13 extracts the regenerant in the high-concentration regenerant barrel 12 and delivers it to the modulation cylinder 11 through the second flowmeter. 15 detects the volume of the high-concentration regenerant, and stops extracting when the set volume is reached. At this time, the high-concentration regenerant and the low-concentration regenerant are mixed in the modulation cylinder 11 and finally form a regenerant of the set concentration. At this time, the third material pump 16 extracts the prepared regenerant and transports it to the ion exchange column 1 through the reflux pipe 17 and stops injecting the regenerant from the regenerant feed pipe 5 into the ion exchange column 1. At this time, the resin can be flushed with the prepared regenerant, realizing the repeated recycling of the low-concentration regenerant, thereby reducing the consumption of the regenerant. At the same time, the concentration of the flushing regenerant is guaranteed to be the set concentration through the preparation, thereby ensuring the effect of resin regeneration;

[0040] When the regeneration agent concentration sensor 28 detects that the concentration of the regeneration agent extracted from the temporary storage tube 7 is the same as the set concentration, it means that the resin regeneration is completed. At this time, deionized water is injected into the deionization column 1 from the deionized water inlet pipe 4, and the excess regeneration agent and the replaced ions are removed by the deionized water, and the sewage is discharged from the sewage pipe 2.

[0041] like Figure 1-Figure 6 As shown, a purification and regeneration device in the production process of lactitol provided by the present invention is provided. A telescopic member 18 is fixedly installed on the modulation cylinder 11, and a lifting plate 19 is fixedly installed on the output end of the telescopic member 18. A vertical pipe 20 is rotatably installed on the lifting plate 19. The vertical pipe 20 is coaxially arranged with the modulation cylinder 11, and the vertical pipe 20 extends into the modulation cylinder 11. The vertical pipe 20 is provided with a first support plate 24 and a second support plate 25 located in the modulation cylinder 11, and a power module 22 for driving the vertical pipe 20 to rotate is provided on the lifting plate 19.

[0042] Specifically, the end of the vertical pipe 20 is rotatably connected to a connecting cylinder 21 , which is connected to the second metering pipe 14 , and is connected to a high-pressure air pump 23 fixedly mounted on the modulation cylinder 11 . The vertical pipe 20 is connected to multiple groups of injection pipes 27 .

[0043] Specifically, the first support plate 24 is fixedly mounted on the vertical tube 20, and the second support plate 25 is slidably mounted on the vertical tube 20. The first support plate 24 and the second support plate 25 are provided with grooves of arc-shaped structures arranged at intervals. The first support plate 24 is fixedly mounted with an electromagnet 26, and the second support plate 25 is fixedly mounted with a permanent magnet 30 corresponding to the position of the electromagnet 26. After the second support plate 25 moves downward and contacts with the first support plate 24, all the grooves on the two support plates are covered.

[0044] Specifically, a plurality of groups of baffles 29 with an annular structure are fixedly installed in the modulation cylinder 11 . The baffles 29 are spaced apart from the first support plate 24 . The first support plate 24 contacts the baffles 29 after moving downward.

[0045] Specifically, a plurality of groups of regeneration agent concentration sensors 28 are provided, and the plurality of groups of regeneration agent concentration sensors 28 are spaced apart from the baffles 29 .

[0046] In actual application of this embodiment, the valve on the injection pipe 27 is opened, and the second material pump 13 extracts the high-concentration regeneration agent and transports it to the vertical pipe 20 through the connecting tube 21. Then, the high-concentration regeneration agent in the vertical pipe 20 enters the modulation tube 11 through the injection pipe 27. Since a set volume of low-concentration regeneration agent is stored in the modulation tube 11, the lower injection pipe 27 can directly spray the high-concentration regeneration agent to different positions inside the low-concentration regeneration agent, and the upper injection pipe 27 will spray the high-concentration regeneration agent above the liquid surface, so that the high-concentration regeneration agent can be directly distributed in different areas of the low-concentration regeneration agent when added, which can accelerate the mixing of high-concentration and low-concentration regeneration agents.

[0047] In the initial state of inputting high-concentration regenerant into the modulation cylinder 11, the electromagnet 26 is energized, so that the relative magnetic poles of the electromagnet 26 and the permanent magnet 30 are opposite. At this time, under the action of magnetic force, the second support plate 25 moves upward away from the first support plate 24, and the vertical pipe 20 is driven to move up and down by the telescopic member 18, so that the first support plate 24, the second support plate 25 and the spray pipe 27 move up and down reciprocatingly, and at the same time, the vertical pipe 20 is driven to rotate continuously by the power module 22. The rotation of the first support plate 24 and the second support plate 25 can stir the regenerant in the modulation cylinder 11, so that the regenerants of different concentrations are mixed faster. The up and down movement and rotation of the spray pipe 27 can directly distribute the high-concentration regenerant in different areas of the low-concentration regenerant to the maximum extent, further reducing the mixing time of the regenerants of different concentrations and increasing the mixing speed of the regenerants of different concentrations;

[0048] When the first support plate 24 and the second support plate 25 move back and forth up and down, the first support plate 24 and the second support plate 25 can push the regeneration agent in front of the moving direction to flow, and the regeneration agent can pass through the first support plate 24 and the second support plate 25 through the grooves on the first support plate 24 and the second support plate 25, so that the regeneration agent in the modulation cylinder 11 can move in the vertical direction, further improving the fluidity of the regeneration agent and increasing the direction of the regeneration agent flow, further improving the effect of mixing regeneration agents of different concentrations, so that the regeneration agent in the modulation cylinder 11 can quickly reach the set concentration;

[0049] When the second material pump 13 delivers the regenerant into the modulation cylinder 11, the high-pressure air pump 23 delivers air into the vertical pipe 20 through the connecting cylinder 21. At this time, the speed of the high-concentration regenerant spraying into the low-concentration regenerant can be further accelerated under the action of air pressure, so that the high-concentration regenerant can flow a longer distance in the low-concentration regenerant, further improve the distribution range of the high-concentration regenerant in the low-concentration regenerant, further accelerate the mixing speed of regenerants of different concentrations, and improve the mixing effect of regenerants of different concentrations. When the high-concentration regenerant reaches the set volume, the valve on the lowest injection pipe 27 is kept open, and the valves on other injection pipes 27 are closed. Under air pressure, the high-concentration regenerant remaining in the vertical pipe 20 will be pushed downward and sprayed through the lowest injection pipe 27, so that all the high-concentration regenerants can leave the vertical pipe 20, ensuring the accuracy of the volume of the high-concentration regenerant, thereby improving the accuracy of the concentration of the mixed regenerant.

[0050] After the stirring setting time, the vertical tube 20 stops rotating, and at the same time, the magnetic pole of the electromagnet 26 changes to attract the permanent magnet 30. Under the action of the magnetic force, the second support plate 25 moves downward and adheres to the first support plate 24. At this time, the grooves on the first support plate 24 and the second support plate 25 are completely blocked. Then the telescopic member 18 drives the vertical tube 20 to move downward so that the first support plate 24 contacts the baffle plate 29 on the lower side. At this time, the regeneration agent in the modulation cylinder 11 can be separated by multiple groups of the first support plate 24, the second support plate 25 and the baffle plate 29. Since the separated area is full of regeneration agent, the regeneration agent with agitated flow will quickly tend to a stable state. The regenerated agent after stirring and mixing can be quickly stabilized, which reduces the waiting time for the regenerated agent concentration detection and ensures the accuracy of the regenerated agent concentration detection. At this time, the regenerated agent concentration in each area is detected by multiple groups of regenerated agent concentration sensors 28. If different regenerated agent concentration sensors 28 detect that the regenerated agent concentrations in different areas are the same, it means that the mixing is completed. At this time, the magnetic poles of the electromagnet 26 are swapped again to make the second support plate 25 leave the first support plate 24. After that, the third material pump 16 can transport the regenerated agent of the set concentration in the modulation cylinder 11 to the deionized column 1. If the concentrations detected by each regenerated agent concentration sensor 28 are different, the stirring and mixing will continue.

[0051] In one embodiment of the present invention, the power module 22 is a motor plus a gear set. The motor drives the vertical tube 20 to rotate through the meshing gear set. Of course, it can also be other structures such as a motor pulley that can drive the vertical tube 20 to rotate. The telescopic member 18 is an electric telescopic rod. Of course, it can also be other components such as a hydraulic cylinder that can actively change the length. The vertical tube 20 is driven up and down by the electric telescopic rod.

[0052] like Figure 1-Figure 6 As shown, the present invention provides a purification and regeneration method in a lactitol production process, which is applied to the purification and regeneration device in the lactitol production process described above, and comprises the following steps:

[0053] Step S1: deionized water enters the lower end of the ion exchange column 1 through the backwash inlet pipe 3 for backwashing, and the flowing water loosens the resin and removes the broken particles and impurities, and the sewage is discharged from the upper drain pipe (not shown);

[0054] Step S2: a regenerant of a set concentration is injected from the upper end of the ion exchange column 1 through the regenerant feed pipe 5, and the liquid in the ion exchange column 1 flows out from the drain pipe 2. The liquid flowing out of the drain pipe 2 is tested for the regenerant. When the regenerant is detected, the valve on the drain pipe 2 is closed and the valve on the connecting pipe 6 is opened, so that the low-concentration regenerant flows into the temporary storage cylinder 7 through the connecting pipe 6;

[0055] Step S3: The regeneration agent in the temporary storage cylinder 7 is extracted by the first material pump 8 and transported to the modulation cylinder 11 through the first metering pipe 9, and the volume of the regeneration agent transported to the modulation cylinder 11 is detected by the first flow meter 10. At this time, the concentration of the regeneration agent in the modulation cylinder 11 is detected by the regeneration agent concentration sensor 28;

[0056] Step S4: Calculate the volume of the high-concentration regenerant according to the detected concentration value and volume of the low-concentration regenerant and the concentration of the high-concentration regenerant, and then extract the regenerant in the high-concentration regenerant barrel 12 through the second material pump 13 and transport it to the modulation barrel 11;

[0057] Step S5: the modulated regeneration agent is extracted by the third material pump 16 and transported to the ion exchange column 1, and the injection of the regeneration agent from the regeneration agent feed pipe 5 into the ion exchange column 1 is stopped;

[0058] Step S6: When the regeneration agent concentration sensor 28 detects that the concentration of the regeneration agent extracted from the temporary storage tube 7 is the same as the set concentration, deionized water is injected into the deionization column 1 from the deionized water inlet pipe 4, and the sewage is discharged from the sewage pipe 2.

[0059] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0060] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A purification and regeneration device for lactitol production process, comprising an ion exchange column (1), characterized in that: One end of the ion exchange column (1) is connected to a sewage discharge pipe (2) and a backwash water inlet pipe (3), and the other end of the ion exchange column (1) is connected to a desalted water inlet pipe (4) and a regeneration agent feed pipe (5); The ion exchange column (1) is connected to a temporary storage cylinder (7) via a connecting pipe (6); the temporary storage cylinder (7) is connected to a modulation cylinder (11) and the regeneration agent in the temporary storage cylinder (7) is transported into the modulation cylinder (11); the temporary storage cylinder (7) is connected to a high-concentration regeneration agent barrel (12) and the high-concentration regeneration agent in the high-concentration regeneration agent barrel (12) is transported into the temporary storage cylinder (7); the modulation cylinder (11) is connected to a third material pump (16); the third material pump (16) is connected to a reflux pipe (17) and the reflux pipe (17) is connected to the ion exchange column (1); a regeneration agent concentration sensor (28) is provided in the modulation cylinder (11); The modulation cylinder (11) is fixedly mounted with a telescopic member (18), an elevating plate (19) is fixedly mounted on the output end of the telescopic member (18), a vertical tube (20) is rotatably mounted on the elevating plate (19), the vertical tube (20) and the modulation cylinder (11) are coaxially arranged, the vertical tube (20) extends into the modulation cylinder (11) and a first support plate (24) and a second support plate (25) located in the modulation cylinder (11) are arranged on the vertical tube (20), and a power module (22) for driving the vertical tube (20) to rotate is arranged on the elevating plate (19); The first support plate (24) is fixedly mounted on the vertical tube (20), and the second support plate (25) is slidably mounted on the vertical tube (20). The first support plate (24) and the second support plate (25) are provided with grooves of arc-shaped structures arranged at intervals. An electromagnet (26) is fixedly mounted on the first support plate (24), and a permanent magnet (30) corresponding to the position of the electromagnet (26) is fixedly mounted on the second support plate (25). When the second support plate (25) moves downward and contacts the first support plate (24), the grooves on the two support plates are completely covered. A plurality of groups of annular baffles (29) are fixedly installed in the modulation cylinder (11), the baffles (29) and the first support plate (24) are spaced apart, and the first support plate (24) contacts the baffles (29) after moving downward; The regeneration agent concentration sensors (28) are provided in multiple groups, and the multiple groups of regeneration agent concentration sensors (28) are spaced apart from the baffle (29).

2. The purification and regeneration device in the lactitol production process according to claim 1, characterized in that: A first material pump (8) is fixedly mounted on the temporary storage cylinder (7) and the first material pump (8) is connected to a first metering pipe (9). The first metering pipe (9) is connected to a modulation cylinder (11) and a first flow meter (10) is arranged on the first metering pipe (9). The first material pump (8) extracts a low-concentration regeneration agent in the temporary storage cylinder (7) and transports it to the modulation cylinder (11).

3. The purification and regeneration device in the lactitol production process according to claim 2, characterized in that: A second material pump (13) is fixedly mounted on the high-concentration regeneration agent barrel (12) and the second material pump (13) is connected to a second metering pipe (14). The second metering pipe (14) is connected to the modulation barrel (11) and a second flow meter (15) is arranged on the second metering pipe (14). The second material pump (13) extracts the high-concentration regeneration agent in the high-concentration regeneration agent barrel (12) and transports it to the modulation barrel (11).

4. The purification and regeneration device in the lactitol production process according to claim 1, characterized in that: The end of the vertical pipe (20) is rotatably connected to a connecting cylinder (21), the connecting cylinder (21) is connected to the second metering pipe (14), the connecting cylinder (21) is connected to a high-pressure air pump (23) fixedly mounted on the modulation cylinder (11), and the vertical pipe (20) is connected to a plurality of spray pipes (27).

5. A purification and regeneration method in a lactitol production process, characterized in that: A purification and regeneration device for use in a lactitol production process as claimed in any one of claims 1 to 4, comprising the following steps: Step S1: deionized water enters the lower end of the ion exchange column (1) through the backwash inlet pipe (3) for backwashing, and the flowing water loosens the resin and removes the broken particles and impurities, and the sewage is discharged from the upper drain pipe; Step S2: a regenerant of a set concentration is injected from the upper end of the ion exchange column (1) through the regenerant feed pipe (5), and the liquid in the ion exchange column (1) flows out from the drain pipe (2). The liquid flowing out of the drain pipe (2) is tested for the regenerant. When the regenerant is detected, the valve on the drain pipe (2) is closed and the valve on the connecting pipe (6) is opened, so that the low-concentration regenerant flows into the temporary storage cylinder (7) through the connecting pipe (6); Step S3: extracting the regeneration agent in the temporary storage cylinder (7) through the first material pump (8) and delivering it to the modulation cylinder (11) through the first metering pipe (9); detecting the volume of the regeneration agent delivered to the modulation cylinder (11) through the first flow meter (10); and detecting the concentration of the regeneration agent in the modulation cylinder (11) through the regeneration agent concentration sensor (28); Step S4: Calculate the required volume of the high-concentration regenerant based on the detected concentration value and volume of the low-concentration regenerant and the concentration of the high-concentration regenerant, then extract the regenerant in the high-concentration regenerant barrel (12) through the second material pump (13) and transport it to the modulation barrel (11); Step S5: the modulated regeneration agent is extracted by the third material pump (16) and transported to the ion exchange column (1), and the injection of the regeneration agent from the regeneration agent feed pipe (5) into the ion exchange column (1) is stopped; Step S6: When the regenerant concentration sensor (28) detects that the concentration of the regenerant extracted from the temporary storage cylinder (7) is the same as the set concentration, deionized water is injected into the deionized water column (1) from the deionized water inlet pipe (4), and the sewage is discharged from the sewage pipe (2).

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