Multistage filter for methylimidazole synthetic stock solution

Abstract

The utility model provides a methylimidazole synthetic stock solution multistage filter which comprises an evaporation cavity, a feeding cavity fixedly arranged at the top end of the evaporation cavity, a feeding pipe penetrating through the side wall of the feeding cavity, a top cover movably arranged at the top end of the feeding cavity, a steam pipe penetrating through the top end of the top cover and a rectifying column arranged at the top end of the steam pipe. The filtering assembly penetrates through the top end of the top cover and is connected with the bottom end in the evaporation cavity; and the circulating pipe penetrates through the bottom end of the rectifying column. When the multi-stage filter for the methylimidazole synthetic stock solution is used, the evaporation cavity heats and evaporates reaction completion liquid in the evaporation cavity, and the filtering assembly has a stirring function and can stir the reaction completion liquid to increase the evaporation effect and filter and collect crystallized solids; crystallization products in reaction completion liquid are reduced, the evaporation crystallization efficiency is further improved, heating steam enters the rectifying column to be condensed in the packing layer, and is converged to a certain amount to flow down from the circulating pipe to enter the evaporation cavity to be circularly evaporated, crystallized and filtered, so that the yield of effective products is improved.

Description

Technical Field

[0001] The utility model relates to the field of filters, in particular to a multi-stage filter for methylimidazole synthesis stock solution. Background Technique

[0002] The current methylimidazole production process is as follows:

[0003] Acetaldehyde (aqueous solution) + Glyoxal (aqueous solution) + Ammonia water → 2-Methylimidazole

[0004] Acetaldehyde (aqueous solution) + Glyoxal (aqueous solution) + Ammonium bicarbonate (aqueous solution) → 2-Methylimidazole

[0005] Acetaldehyde (aqueous solution) + Glyoxal (aqueous solution) + Ammonium oxalate (aqueous solution) → 2-Methylimidazole

[0006] In the above production processes, after the reaction is completed, the pressure of the crystalline product methylimidazole is reduced, and then the water brought in by the raw materials and generated by the reaction is removed by heating and evaporation. The water vapor generated during the evaporation process will carry away the unreacted raw materials (such as ammonia, acetaldehyde, ammonium bicarbonate, etc.) and intermediate products (such as acetaldehyde ammonia) in the (reaction completion liquid) and condense and discharge them together. As the product in the reaction completion liquid gradually crystallizes and the solid content increases, the evaporation efficiency will be reduced. Content of the Utility Model

[0007] The utility model provides a multi-stage filter for methylimidazole synthesis stock solution to solve the technical problems existing in the above background technique.

[0008] The purpose and effect of the multi-stage filter for methylimidazole synthesis stock solution of the utility model are achieved by the following specific technical means: including an evaporation chamber, a feed chamber fixedly arranged at the top of the evaporation chamber, a feed pipe penetrating the side wall of the feed chamber, a top cover movably arranged at the top of the feed chamber, a steam pipe penetrating the top cover, and a rectification column arranged at the top of the steam pipe:

[0009] A filter assembly, penetrating the top cover and connecting to the bottom end inside the evaporation chamber, including a stirring and filtering structure movably installed at the bottom end inside the evaporation chamber and a conveying structure fixedly installed at the bottom end of the top cover;

[0010] A circulation pipe, penetrating the bottom end of the rectification column, including a circulation structure penetrating the bottom end of the rectification column and connecting to the inside of the feed pipe.

[0011] Preferably, the stirring and filtering structure of the filter assembly includes:

[0012] A motor, movably installed at the top of the top cover;

[0013] A central shaft, penetrating the top of the top cover and movably connected to the output end of the motor;

[0014] Filter plates, fixedly arranged on the central shaft;

[0015] The central axis is movably connected to the inside of the top cover through a bearing, and the bottom end of the central axis is movably connected to the bottom end inside the evaporation chamber through a bearing. The filter sheet is in a threaded shape.

[0016] Preferably, the conveying structure of the filtering assembly includes:

[0017] A partition layer, fixedly arranged at the bottom end inside the top cover;

[0018] A conveying pipe, penetrating through the upper and lower ends of the partition layer and arranged inside the central axis;

[0019] The conveying pipe is in the shape of a hollow cylindrical pipe inside. The outer diameter size of the filter sheet is adapted to the inner size of the conveying pipe, and the height size of the filter sheet is smaller than the height size of the central axis.

[0020] Preferably, the circulating structure of the circulating pipe includes:

[0021] A circulating pipe, the bottom end of which is connected to the feed pipe;

[0022] A condensation layer, arranged on the inner wall of the rectifying column;

[0023] A packing layer, arranged inside the rectifying column for the inner space part of the condensation layer;

[0024] The circulating pipe is in the shape of a U-shaped pipe, and the height position of the top end of the circulating pipe is lower than the top end of the steam pipe.

[0025] Preferably, the bottom end of the steam pipe penetrates through the top cover and is connected to the inside of the feed chamber, and the top end of the steam pipe penetrates through the bottom end of the rectifying column and is connected to the inside of the packing layer.

[0026] Preferably, a liquid outlet pipe is arranged through the bottom end of the rectifying column.

[0027] Preferably, a gas outlet pipe is arranged through the top end of the rectifying column.

[0028] Preferably, a condensation column is fixedly arranged at the other end of the gas outlet pipe.

[0029] Beneficial effects:

[0030] 1. By setting up the stirring and filtering structure and the conveying structure, when the power supply of the wire is connected, the evaporation chamber heats and evaporates the reaction-complete liquid inside. The motor drives the central axis and the filter sheet to rotate. The threaded shape of the filter sheet has a stirring function to stir the reaction-complete liquid to increase the evaporation effect. The crystallized product will be transported by the filter sheet along the conveying pipe to the partition layer, so that the crystalline solid in the reaction-complete liquid is filtered and collected, reducing the crystalline product in the reaction-complete liquid and further increasing the evaporation and crystallization efficiency.

[0031] 2. By setting up a loop structure, the reaction completion liquid is heated to generate evaporation steam, which enters the distillation column through the steam pipe. Water vapor, unreacted raw materials, intermediate products, and reaction products carried away by the steam will condense in the packing layer under the cooling effect of the condensation layer, converge and be collected at the bottom of the packing layer. The liquid level in the circulation pipe will also rise accordingly. When the liquid level inside the packing layer is higher than the highest point of the circulation pipe, the condensed liquid will flow down through the circulation pipe, enter the feed pipe, flow into the feed chamber, and then into the evaporation chamber for cyclic evaporation, crystallization, and filtration, thereby improving the yield of the effective product. Brief Description of the Drawings

[0032] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0033] Figure 2 It is a schematic diagram of the internal structure of the evaporation chamber of the present invention.

[0034] Figure 3 It is a schematic diagram of the structure of the filtration component of the present invention.

[0035] Figure 4 It is a schematic diagram of the structure of the circulation pipe of the present invention;

[0036] Figure 5 It is a schematic diagram of the internal structure of the distillation column of the present invention.

[0037] Figures 1-5 Among them, the corresponding relationship between the component names and the drawing numbers is as follows:

[0038] 1. Evaporation chamber; 2. Feed chamber; 3. Top cover; 4. Filtration component; 401. Motor; 402. Central shaft; 403. Filter disc; 404. Delivery pipe; 405. Partition layer; 5. Steam pipe; 6. Distillation column; 7. Liquid outlet pipe; 8. Circulation pipe; 9. Air outlet pipe; 10. Condensation column; 11. Packing layer; 12. Condensation layer; 13. Feed pipe. Detailed Embodiments

[0039] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0040] Embodiment 1

[0041] As shown in Figure 1 Figure Figure 2 Figure Figure 3As shown in the figure: It includes an evaporation chamber 1, a feed chamber 2 fixedly arranged at the top of the evaporation chamber 1, a feed pipe 13 penetrating through the side wall of the feed chamber 2, a top cover 3 movably arranged at the top of the feed chamber 2, a steam pipe 5 penetrating through the top of the top cover 3, and a rectifying column 6 arranged at the top of the steam pipe 5; a filtering assembly 4, penetrating through the top of the top cover 3 and connecting to the bottom end inside the evaporation chamber 1, including a stirring and filtering structure movably installed at the bottom end inside the evaporation chamber 1 and a conveying structure fixedly installed at the bottom end of the top cover 3; a circulation pipe 8, penetrating through the bottom end of the rectifying column 6, including a circulation structure penetrating through the bottom end of the rectifying column 6 and connecting to the inside of the feed pipe 13.

[0042] The stirring and filtering structure of the filtering assembly 4 includes: a motor 401 movably installed at the top of the top cover 3, a central shaft 402 penetrating through the top of the top cover 3 and movably connected to the output end of the motor 401, and a filter plate 403 fixedly arranged on the central shaft 402; the central shaft 402 is movably connected to the inside of the top cover 3 through a bearing, the bottom end of the central shaft 402 is movably connected to the bottom end inside the evaporation chamber 1 through a bearing, the filter plate 403 is in a threaded shape, the motor 401 drives the central shaft 402 and the filter plate 403 to rotate, and the threaded setting of the filter plate 403 has a stirring function to stir the reaction-completed liquid and increase the evaporation effect.

[0043] The conveying structure of the filtering assembly 4 includes: a partition layer 405 fixedly arranged at the bottom end inside the top cover 3, and a conveying pipe 404 arranged inside the partition layer 405 through the upper and lower ends and on the central shaft 402; the conveying pipe 404 is in the shape of a hollow cylindrical pipe, the outer diameter size of the filter plate 403 is adapted to the internal size of the conveying pipe 404, the height size of the filter plate 403 is smaller than the height size of the central shaft 402, and the crystallized product will be transported to the partition layer 405 by the filter plate 403 along the conveying pipe 404, so that the crystalline solids in the reaction-completed liquid are filtered and collected.

[0044] Embodiment 2

[0045] As shown in the attached Figure 1 、attached Figure 4 and attached Figure 5 As shown in the figure: The circulation structure of the circulation pipe 8 includes: a circulation pipe 8 with its bottom end connected to the feed pipe 13, a condensation layer 12 arranged on the inner wall of the rectifying column 6, and a packing layer 11 arranged inside the rectifying column 6 for the internal space part of the condensation layer 12; the circulation pipe 8 is in the shape of a U-shaped pipe, and the height position of the top end of the circulation pipe 8 is lower than the top end of the steam pipe 5.

[0046] Embodiment 3

[0047] As shown in the attached Figure 1As shown in the figure: The bottom end of the steam pipe 5 penetrates through the top cover 3 and is connected to the inside of the feed chamber 2. The top end of the steam pipe 5 penetrates through the bottom end of the rectifying column 6 and is connected to the inside of the packing layer 11. The reaction-complete liquid is heated and evaporated into steam, which enters the rectifying column 6 through the steam pipe 5. The heating steam condenses in the packing layer 11 under the cooling action of the condensation layer 12, converges and is collected at the bottom of the packing layer 11. The liquid level in the circulation pipe 8 also rises accordingly. When the liquid level inside the packing layer 11 is higher than the highest point of the circulation pipe 8, the condensed liquid will flow down from the circulation pipe 8, enter the feed pipe 13, flow into the feed chamber 2, and then enter the evaporation chamber 1 for cyclic evaporation, crystallization and filtration.

[0048] A liquid discharge pipe 7 is penetrated and arranged at the bottom end of the rectifying column 6. After the reaction products in the reaction-complete liquid are fully collected, the waste liquid in the rectifying column 6 is discharged through the liquid discharge pipe 7.

[0049] An air outlet pipe 9 is penetrated and arranged at the top end of the rectifying column 6. Components such as water vapor, intermediate products and side reaction products in the steam that are not in need of recovery are discharged from the air outlet pipe 9.

[0050] The other end of the air outlet pipe 9 is fixedly provided with a condensation column 10, and the waste gas is condensed and collected in the condensation column 10.

[0051] Working principle: Connect the wire power supply. The evaporation chamber 1 heats and evaporates the reaction-complete liquid inside. The motor 401 drives the central shaft 402 and the filter disc 403 to rotate. The threaded setting of the filter disc 403 has a stirring function to stir the reaction-complete liquid and increase the evaporation effect. The crystallized products will be transported by the filter disc 403 along the conveying pipe 404 to the partition layer 405, so that the crystalline solids in the reaction-complete liquid are filtered and collected, reducing the crystalline products in the reaction-complete liquid and further increasing the evaporation and crystallization efficiency. The reaction-complete liquid is heated and evaporated into steam, which enters the rectifying column 6 through the steam pipe 5. Water vapor, unreacted raw materials, intermediate products and reaction products carried away by the steam will condense in the packing layer 11 under the cooling action of the condensation layer 12, converge and be collected at the bottom of the packing layer 11. The liquid level in the circulation pipe 8 also rises accordingly. When the liquid level inside the packing layer 11 is higher than the highest point of the circulation pipe 8, the condensed liquid will flow down from the circulation pipe 8, enter the feed pipe 13, flow into the feed chamber 2, and then enter the evaporation chamber 1 for cyclic evaporation, crystallization and filtration, improving the yield of the effective product.

Claims

1. Multi-stage filter for methylimidazole synthesis stock solution, comprising an evaporation chamber (1), a feed chamber (2) fixedly arranged at the top of the evaporation chamber (1), a feed pipe (13) penetrating through the side wall of the feed chamber (2), a top cover (3) movably arranged at the top of the feed chamber (2), a steam pipe (5) penetrating through the top of the top cover (3), and a rectifying column (6) arranged at the top of the steam pipe (5), characterized in that: A filter assembly (4) penetrates through the top of the top cover (3) and is connected to the inner bottom end of the evaporation chamber (1), and comprises a stirring and filtering structure movably installed at the inner bottom end of the evaporation chamber (1) and a conveying structure fixedly installed at the bottom end of the top cover (3); A circulation pipe (8) penetrates through the bottom end of the rectifying column (6) and comprises a circulation structure penetrating through the bottom end of the rectifying column (6) and connected to the inside of the feed pipe (13).

2. The multi-stage filter according to claim 1, wherein: The stirring and filtering structure of the filter assembly (4) comprises: A motor (401) movably installed at the top of the top cover (3); A central shaft (402) penetrates through the top of the top cover (3) and is movably connected to the output end of the motor (401); Filter discs (403) fixedly arranged on the central shaft (402); The central shaft (402) is movably connected to the inside of the top cover (3) through a bearing, the bottom end of the central shaft (402) is movably connected to the inner bottom end of the evaporation chamber (1) through a bearing, and the filter discs (403) are in a threaded shape.

3. The multi-stage filter according to claim 2, wherein: The conveying structure of the filter assembly (4) comprises: A partition layer (405) fixedly arranged at the inner bottom end of the top cover (3); A conveying pipe (404) penetrates through the upper and lower ends of the partition layer (405) and is arranged on the central shaft (402); The conveying pipe (404) is in the shape of a hollow cylindrical pipe, the outer diameter size of the filter discs (403) is adapted to the inner size of the conveying pipe (404), and the height size of the filter discs (403) is smaller than the height size of the central shaft (402).

4. The multi-stage filter according to claim 1, characterized in that: The circulation structure of the circulation pipe (8) comprises: The circulation pipe (8), the bottom end of which is connected to the feed pipe (13); A condensation layer (12) arranged on the inner wall of the rectifying column (6); A packing layer (11) arranged inside the rectifying column (6) for the inner space part of the condensation layer (12); The circulation pipe (8) is in the shape of a U-shaped pipe, and the height position of the top end of the circulation pipe (8) is lower than the top end of the steam pipe (5).

5. The multi-stage filter according to claim 1, characterized in that: The bottom end of the steam pipe (5) penetrates through the top cover (3) and is connected to the inside of the feed chamber (2), and the top end of the steam pipe (5) penetrates through the bottom end of the rectifying column (6) and is connected to the inside of the packing layer (11).

6. The multi-stage filter according to claim 1, wherein: A liquid outlet pipe (7) penetrates through the bottom end of the rectifying column (6).

7. The multi-stage filter according to claim 1, wherein: A gas outlet pipe (9) penetrates through the top end of the rectifying column (6).

8. The multi-stage filter according to claim 7, wherein: The other end of the gas outlet pipe (9) is fixedly provided with a condensation column (10).

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