Continuous recrystallization device

Abstract

The utility model relates to the technical field of recrystallization equipment, in particular to a continuous recrystallization device which comprises a conveying tank, the bottom of the conveying tank is communicated with a dissolving tank, the top of the conveying tank is communicated with a feeding pipe, the bottom of the dissolving tank is communicated with a discharging pipe, the top of the conveying tank is provided with a motor, and the motor is connected with the dissolving tank. An output shaft of the motor is fixedly connected with a driving shaft, and the lower end of the driving shaft sequentially penetrates through the conveying tank and the dissolving tank and extends into the dissolving tank; by arranging a flow guide structure, in the continuous recrystallization process, by powering off an electromagnet, discharged mother liquor cannot be discharged through a feeding pipe and then can be guided into a guide pipe, materials can be conveyed into the feeding pipe through a conveying pipe by starting a pump body, and then the materials are guided into a conveying tank; and the mother liquor can be transferred in time, so that the crystal separation loss caused by the temperature reduction of the mother liquor can be reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to re -crystallization equipment technical field, especially a kind of continuous re -crystallization device. BACKGROUND

[0002] In the production process of sulfonamides, in order to obtain higher purity products, there is always a re-crystallization unit operation. The re-crystallization unit operation generally includes primary crystallization, primary solid-liquid separation, solid discharge, solid feeding, secondary dissolution, secondary crystallization, secondary solid-liquid separation, product drying and other operations, which are generally intermittent operations. Each step requires a special device to achieve its function, and the entire system is relatively large, with multiple operation steps and high risk.

[0003] After searching, China patent discloses a kind of safe continuous re -crystallization device (announcement number CN218306262U), which realizes solid-liquid separation, solid discharge, solid feeding and secondary dissolution and other steps, with equipment intensification, continuous, reduce labor intensity, but in the re-crystallization process, the mother liquor is guided back into the filter cavity for precipitation and re-crystallization. However, the traditional method cannot be transferred in time, which can easily cause the temperature of the mother liquor to drop and cause the crystallization to precipitate, thus reducing the recovery rate of crystallization. Therefore, a continuous re -crystallization device is provided to solve the problems in the above background technology. UTILITY MODEL CONTENT

[0004] The utility model aims to solve the above problems by providing a kind of continuous re -crystallization device, which improves the problem that traditional method cannot be transferred in time, which can easily cause the temperature of the mother liquor to drop and cause the crystallization to precipitate, thus reducing the recovery rate of crystallization.

[0005] The utility model realizes the above-mentioned purposes by the following technical solutions. A kind of continuous re -crystallization device, comprising:

[0006] The bottom of the conveying tank is communicated with a dissolving tank, the top of the conveying tank is communicated with a feed pipe, the bottom of the dissolving tank is communicated with a discharge pipe, the top of the conveying tank is provided with a motor, the output shaft of the motor is fixedly connected with a driving shaft, and the lower end of the driving shaft penetrates the conveying tank and the dissolving tank in sequence and extends into the interior of the dissolving tank.

[0007] The mixing structure is arranged in the interior of the dissolving tank.

[0008] The flow guide structure is arranged on the surface of the discharge pipe.

[0009] Preferably, the flow guide structure includes a pump body arranged on one side of the discharge pipe, one end of the pump body is communicated with a conveying pipe, the other end of the conveying pipe is communicated with the feed pipe, the other end of the pump body is communicated with a guide pipe, and the other end of the guide pipe is communicated with the discharge pipe.

[0010] Preferably, the inside of the discharge pipe is provided with a fixed block, the surface of the fixed block is slidably connected with a shielding ring, the shielding ring shields the communication between the guide pipe and the discharge pipe, the inside of the discharge pipe is provided with an electromagnet, the upper end of the shielding ring is connected with the surface of the electromagnet, and the shielding ring is a ferrite stainless steel component.

[0011] Preferably, the inner wall of the discharge pipe is fixedly connected with a limiting ring located below the fixed block, the bottom of the shielding ring is fixedly connected with a limiting rod, and the lower end of the limiting rod penetrates through the limiting ring and is fixedly connected with a limiting block.

[0012] Preferably, the top of the fixed block is provided with two recesses which are symmetrically distributed, and the inner bottom wall of the recess is obliquely arranged.

[0013] Preferably, the mixing structure comprises a stirring rod fixedly connected to the surface of the driving shaft, the surface of the driving shaft is fixedly connected with three groups of mounting rods which are annularly distributed, the inside of the dissolving tank is provided with three scrapers which are annularly distributed, and one side of the scraper is in contact with the inner wall of the dissolving tank.

[0014] Preferably, the surface of the scraper is fixedly connected with two adjusting rods which are symmetrically distributed, the other end of the adjusting rod penetrates through the adjacent mounting rod and is slidably connected with the inner wall of the mounting rod, and the surface of the adjusting rod and the inner wall of the mounting rod are fixedly connected with a spring.

[0015] The beneficial effects of the utility model are: through the setting of the flow guide structure, in the continuous recrystallization process, the discharged mother liquor cannot be discharged through the feeding pipe by the power-off of the electromagnet, and then can be guided into the inside of the guide pipe, the material can be conveyed to the inside of the feeding pipe through the conveying pipe by starting the pump body, and then guided into the inside of the conveying tank, so as to recrystallize again, and the mother liquor can be timely transferred to reduce the loss of crystal precipitation caused by the temperature reduction of the mother liquor. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the structural schematic view of the utility model;

[0017] Figure 2 It is the local section schematic view of the utility model;

[0018] Figure 3 It is the distribution schematic view of the electromagnet, shielding ring and fixed block of the utility model;

[0019] Figure 4 It is the structural schematic view of the mixing structure of the utility model.

[0020] In the figure: 1, conveying tank; 101, feed pipe; 2, dissolving tank; 201, discharge pipe; 21, mixing structure; 211, mounting rod; 212, adjusting rod; 213, spring; 214, scraper; 215, stirring rod; 3, motor; 301, drive shaft; 4, flow guide structure; 401, pump body; 402, conveying pipe; 403, fixing block; 404, limiting ring; 405, limiting block; 406, limiting rod; 407, electromagnet; 408, groove; 409, guide pipe; 410, shielding ring. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0022] In the specific implementation, as shown in the figure, a continuous recrystallization device comprises: Figure 1-4

[0023] The conveying tank 1 is communicated at the bottom with the dissolving tank 2, communicated at the top with the feed pipe 101, and provided at the top with the motor 3. The output shaft of the motor 3 is fixedly connected with the drive shaft 301, and the lower end of the drive shaft 301 penetrates the conveying tank 1 and the dissolving tank 2 in sequence and extends to the inside of the dissolving tank 2.

[0024] The mixing structure 21 is arranged in the inside of the dissolving tank 2.

[0025] The flow guide structure 4 is arranged on the surface of the discharge pipe 201.

[0026] As shown in the figure, the flow guide structure 4 comprises the pump body 401 arranged on one side of the discharge pipe 201. One end of the pump body 401 is communicated with the conveying pipe 402, and the other end of the conveying pipe 402 is communicated with the feed pipe 101. The other end of the pump body 401 is communicated with the guide pipe 409, and the other end of the guide pipe 409 is communicated with the discharge pipe 201. Figure 1 Figure 2 Figure 3

[0027] The inside of the discharge pipe 201 is provided with the fixing block 403, and the surface of the fixing block 403 is slidingly connected with the shielding ring 410. The shielding ring 410 shields the communication position of the guide pipe 409 and the discharge pipe 201. The inside of the discharge pipe 201 is provided with the electromagnet 407, and the upper end of the shielding ring 410 is connected with the surface of the electromagnet 407. The shielding ring 410 is a ferritic stainless steel component.​​​​

[0028] The inner wall of the discharge pipe 201 is fixedly connected with a limiting ring 404 located below the fixed block 403, the bottom of the shielding ring 410 is fixedly connected with a limiting rod 406, and the lower end of the limiting rod 406 penetrates through the limiting ring 404 and is fixedly connected with a limiting block 405.

[0029] The top of the fixed block 403 is provided with two symmetrical recesses 408, and the inner bottom wall of the recess 408 is arranged in a slope.

[0030] Specifically, the discharge pipe 201 is provided with a valve, and the valve is located above the electromagnet 407. Since the valve is a technology familiar to those skilled in the art, it is not shown in the figure.

[0031] By energizing the electromagnet 407, the electromagnet 407 generates magnetism to attract the shielding ring 410 of the ferritic stainless steel material component to the surface of the electromagnet 407. At this time, the shielding ring 410 shields the communication between the guide pipe 409 and the discharge pipe 201. At this time, the material discharged through the discharge pipe 201 can enter the inside of the shielding ring 410, and can be discharged through the discharge pipe 201 by passing through the shielding ring 410 through the recess 408;

[0032] The electromagnet 407 can slide down along the inner wall of the discharge pipe 201 under the action of its own gravity when the electromagnet 407 is de-energized. The limiting rod 406 is provided to ensure the stability of the shielding ring 410 during the sliding process. At the same time, the limiting ring 404 can limit the sliding height of the shielding ring 410. When the bottom of the shielding ring 410 contacts the top surface of the limiting ring 404, the top surface of the shielding ring 410 is flush with the top surface of the fixed block 403. At this time, the inside of the shielding ring 410 can shield the bottom opening of the recess 408, so that the subsequent discharged material cannot be discharged through the feeding pipe 101, and can be guided into the inside of the guide pipe 409. By starting the pump body 401, the material can be conveyed to the inside of the feeding pipe 101 through the conveying pipe 402, and then guided into the inside of the conveying tank 1, so as to be recrystallized again.

[0033] When the continuous recrystallization is finished, the electromagnet 407 is energized, so that the material is discharged through the discharge pipe 201. When recrystallization is needed, that is, when the crystal is dissolved in the mother liquor for recrystallization, the electromagnet 407 is de-energized and the pump body 401 is started, thereby realizing the effect of continuous recrystallization, reducing the situation that the traditional crystal is dissolved in the mother liquor and then discharged from the dissolving tank 2 and then re-guided into the conveying tank 1, and improving the subsequent crystallization yield.

[0034] As Figure 1 , Figure 2 and Figure 4As shown, the mixing structure 21 comprises the stirring rod 215 fixedly connected to the surface of the driving shaft 301, the surface of the driving shaft 301 is fixedly connected with three groups of annularly distributed mounting rods 211, the inside of the dissolving tank 2 is provided with three groups of annularly distributed scrapers 214, and one side of the scraper 214 is in contact with the inner wall of the dissolving tank 2.

[0035] The surface of the scraper 214 is fixedly connected with two groups of symmetrically distributed adjusting rods 212, the other end of the adjusting rod 212 penetrates through the adjacent mounting rod 211 and is in sliding connection with the inner wall of the mounting rod 211, and the surface of the adjusting rod 212 and the inner wall of the mounting rod 211 are fixedly connected with the spring 213;

[0036] The scraper 214 is driven to rotate through the adjusting rod 212 and the mounting rod 211 in the process of rotating the driving shaft 301, so that the inner wall of the dissolving tank 2 can be cleaned, the situation that the crystallization is adhered to the inner wall and is not convenient to mix with the mother liquor is reduced, and the dissolving rate is effectively improved.

[0037] In use, the electromagnetic iron 407 is powered on or off according to the production process, the electromagnetic iron 407 is powered on when the continuous recrystallization is finished, so that the material is discharged through the discharge pipe 201, the electromagnetic iron 407 is powered off and the pump body 401 is started when it is needed to recrystallize again, that is, the crystallization is introduced into the mother liquor to dissolve and recrystallize, thereby realizing the effect of continuous recrystallization, reducing the situation that the liquid is cooled and crystallized in the process of discharging the dissolving tank 2 and then re-introducing the conveying tank 1 after the traditional crystallization is dissolved in the mother liquor, and improving the subsequent crystallization yield.

[0038] In addition, it should be understood that, although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description manner of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be combined appropriately to form other embodiments that can be understood by those skilled in the art.

Claims

1. A continuous recrystallization device, characterized in that: include: A conveying tank (1), wherein the bottom of the conveying tank (1) is connected to a dissolving tank (2), the top of the conveying tank (1) is connected to a feeding pipe (101), the bottom of the dissolving tank (2) is connected to a discharging pipe (201), a motor (3) is provided on the top of the conveying tank (1), the output shaft of the motor (3) is fixedly connected to a driving shaft (301), and the lower end of the driving shaft (301) passes through the conveying tank (1) and the dissolving tank (2) in sequence and extends to the interior of the dissolving tank (2); A mixing structure (21), wherein the mixing structure (21) is arranged inside the dissolving tank (2); A flow guiding structure (4), wherein the flow guiding structure (4) is arranged on the surface of the discharge pipe (201).

2. A continuous recrystallization device according to claim 1, characterized in that: The diversion structure (4) includes a pump body (401) arranged on one side of the discharge pipe (201), one end of the pump body (401) is connected to a delivery pipe (402), the other end of the delivery pipe (402) is connected to the feed pipe (101), the other end of the pump body (401) is connected to a guide pipe (409), and the other end of the guide pipe (409) is connected to the discharge pipe (201).

3. A continuous recrystallization device according to claim 2, characterized in that: A fixed block (403) is provided inside the discharge pipe (201), and a blocking ring (410) is slidably connected to the surface of the fixed block (403). The blocking ring (410) blocks the connection between the guide tube (409) and the discharge pipe (201). An electromagnet (407) is provided inside the discharge pipe (201), and the upper end of the blocking ring (410) is connected to the surface of the electromagnet (407). The blocking ring (410) is a ferritic stainless steel component.

4. A continuous recrystallization device according to claim 3, characterized in that: The inner wall of the discharge pipe (201) is fixedly connected to a limiting ring (404) located below the fixed block (403), the bottom of the shielding ring (410) is fixedly connected to a limiting rod (406), and the lower end of the limiting rod (406) passes through the limiting ring (404) and is fixedly connected to the limiting block (405).

5. A continuous recrystallization device according to claim 4, characterized in that: Two symmetrically distributed grooves (408) are provided on the top of the fixing block (403), and the inner bottom walls of the grooves (408) are inclined.

6. A continuous recrystallization device according to claim 1, characterized in that: The mixing structure (21) comprises a stirring rod (215) fixedly connected to the surface of a driving shaft (301); three groups of mounting rods (211) arranged in an annular pattern are fixedly connected to the surface of the driving shaft (301); three scrapers (214) arranged in an annular pattern are provided inside the dissolving tank (2); one side of the scraper (214) contacts the inner wall of the dissolving tank (2).

7. A continuous recrystallization device according to claim 6, characterized in that: Two symmetrically distributed adjusting rods (212) are fixedly connected to the surface of the scraper (214); the other ends of the adjusting rods (212) pass through the adjacent mounting rods (211) and are slidably connected to the inner wall of the mounting rod (211); and a spring (213) is fixedly connected between the surface of the adjusting rod (212) and the inner wall of the mounting rod (211).

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