Recovery device of 1-methylimidazole mother liquor

Abstract

The utility model discloses a recovery device of 1-methylimidazole mother liquor, which relates to the technical field of chemical engineering, and comprises a methylimidazole recovery box and a distillation box, the top of the distillation box is connected with a steam output pipe, one end of the steam output pipe far away from the distillation box is connected with an obliquely arranged transmission pipe, and the other end of the steam output pipe is connected with a steam pump. A refrigerator used for refrigerating the conveying pipe is installed on the outer wall of the conveying pipe. A corrugated pipe capable of stretching out and drawing back in the axial direction of the conveying pipe is arranged in the conveying pipe. According to the utility model, 1-methylimidazole mother liquor in the distillation box enters the steam output pipe and the transmission pipe after being gasified, the refrigerator enables the temperature in the transmission pipe to be reduced and the corrugated pipe to be cooled, the gasified mother liquor is condensed into liquid to be attached when encountering the inner wall of the corrugated pipe, and the 1-methylimidazole mother liquor is evaporated by repeatedly pulling and loosening the connecting rope and stretching and shrinking by virtue of the wrinkle structure of the corrugated pipe. Friction force generated by liquid inertia is utilized to overcome adhesive force, the liquid is helped to rapidly fall off, and then the liquid flows into the methylimidazole recycling box through the connecting pipe to be collected.

Description

Technical Field

[0001] This utility model relates to the field of chemical engineering technology, specifically to a device for recovering 1-methylimidazole mother liquor. Background Technology

[0002] 1-Methylimidazole is an important organic intermediate with wide applications in pharmaceuticals, pesticides, electronic chemicals, and many other fields. Its production process generates a large amount of mother liquor, which typically contains a considerable amount of unreacted 1-methylimidazole, as well as other byproducts and impurities.

[0003] If the mother liquor is discharged directly, these raw materials will be wasted. By treating the mother liquor with recycling equipment, the 1-methylimidazole in it can be effectively recovered and reused in production.

[0004] To achieve recycling, existing technologies typically employ distillation, heating the mother liquor to near the boiling point of 1-methylimidazole to vaporize it. The vapor is then cooled into liquid using a condenser, and relatively pure 1-methylimidazole is collected. The vaporized 1-methylimidazole mother liquor comes into contact with a refrigeration device and becomes liquid again. The liquid drips down and flows directly to a designated location to complete the collection.

[0005] However, if the 1-methylimidazole vapor is cooled into a liquid in the refrigeration equipment and the liquid is not removed from the refrigeration equipment in time, the liquid will continue to cool down slowly if it stays on the refrigeration equipment for too long. As the temperature decreases further, its solubility in the mother liquor will also continue to decrease. When it reaches a certain level, the solution will become supersaturated again, causing the solute to precipitate in the form of crystals. These crystals then adhere to the refrigeration equipment, which not only affects the subsequent refrigeration effect of the equipment, but also requires additional removal of the crystals. Utility Model Content

[0006] The purpose of this invention is to provide a device for recovering 1-methylimidazole mother liquor, so as to solve the problems mentioned in the background art.

[0007] To solve the above technical problems, this utility model provides a 1-methylimidazole mother liquor recovery device, including a methylimidazole recovery tank and a distillation tank. The top of the distillation tank is connected to a steam output pipe, and the end of the steam output pipe away from the distillation tank is connected to an inclined transmission pipe. A cooler for cooling the transmission pipe is installed on the outer wall of the transmission pipe.

[0008] The transmission pipe is equipped with a corrugated pipe that can extend and retract along the axial direction of the transmission pipe, and the outer wall of the corrugated pipe is attached to the inner top wall of the transmission pipe; the driving part is located at one end of the corrugated pipe and includes at least a freely stretchable connecting rope, one end of which is connected to one end of the corrugated pipe and the other end extends to the outside of the transmission pipe; a connecting pipe is connected between the transmission pipe and the methylimidazole recovery box.

[0009] Furthermore, the drive unit also includes a port, which is opened on the transmission pipe. An air outlet pipe is installed on the inner wall of the port. An installation ring is installed on the inner wall of the air outlet pipe. Multiple elastic ropes are installed on the top of the installation ring. An elastic cloth is connected between the top ends of the multiple elastic ropes. The end of the connecting rope away from the corrugated pipe is connected to the bottom of the elastic cloth. An electric valve is connected to the steam output pipe.

[0010] Furthermore, a fixing ring and a fixing plate are installed on the inner wall of the transmission pipe, and two connecting rods are installed between the fixing plate and the fixing ring. The outer wall of the connecting rods abuts against the edge of the corrugated pipe.

[0011] Furthermore, a support rod is connected between the fixing plate and the fixing ring, and the outer wall of the support rod abuts against the inner wall of the bellows.

[0012] Furthermore, one end of the bellows is connected to the outer wall of the fixed ring, and the other end is equipped with a support plate, which is slidably connected to the outer wall of the connecting rod.

[0013] Furthermore, the fixing plate has an insertion hole, and the end of the connecting rope away from the elastic cloth passes through the insertion hole and connects to the outer wall of the support plate.

[0014] Furthermore, an anti-wear pad is installed on the inner wall of the socket, and the outer wall of the connecting rope abuts against the inner wall of the anti-wear pad.

[0015] Furthermore, a wear-resistant pad is installed at the bottom of the air outlet pipe, and one end of the connecting rope extends past the wear-resistant pad into the interior of the air outlet pipe.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] 1. In this utility model, after the 1-methylimidazole mother liquor in the distillation tank is vaporized, it enters the steam output pipe and the transmission pipe. The cooler lowers the temperature inside the transmission pipe, and the corrugated pipe is cooled. The vaporized mother liquor condenses into liquid and adheres to the inner wall of the corrugated pipe. By repeatedly pulling and releasing the connecting rope, the corrugated pipe expands and contracts with the help of the pleated structure. The friction generated by the inertia of the liquid overcomes the adhesion force, helping the liquid to fall quickly. Then, it flows into the methylimidazole recovery tank through the connecting pipe to complete the collection.

[0018] 2. In this utility model, the vent pipe is the outlet channel for gas. The gas causes the elastic cloth to expand inside the vent pipe, thereby pulling the connecting rope. The electric valve opens and closes at regular intervals, allowing gas to enter the corrugated pipe at intervals, thereby causing the elastic cloth to expand at intervals, realizing the repeated pulling and releasing of the connecting rope. The corrugated pipe is stretched and contracted by the connecting rope. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 3 This is a schematic diagram of the connection structure between the corrugated pipe and the fixing ring in this utility model;

[0022] Figure 4 This is a schematic diagram of the connection structure between the fixing plate and the connecting rod in this utility model;

[0023] Figure 5 This is a schematic diagram of the connection structure between the mounting ring and the elastic rope in this utility model;

[0024] Figure 6 for Figure 3 Enlarged view of the structure at point A in the middle.

[0025] In the diagram: 1. Methylimidazole recovery box;

[0026] 2. Distillation tank; 3. Anti-wear pad; 4. Steam output pipe; 5. Electric valve; 6. Insertion port; 7. Refrigerator; 8. Connecting pipe; 9. Gas outlet pipe; 10. Transmission pipe; 11. Corrugated pipe; 12. Fixing ring; 13. Fixing plate; 14. Connecting rod; 15. Connecting rope; 16. Support plate; 17. Through port; 18. Support rod; 19. Mounting ring; 20. Elastic rope; 21. Elastic cloth; 22. Wear-resistant pad. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] This utility model provides a technical solution:

[0029] See Figures 1-6As shown, a 1-methylimidazole mother liquor recovery device includes a methylimidazole recovery tank 1 and a distillation tank 2. A steam output pipe 4 is fixedly connected to the top of the distillation tank 2. An inclined transmission pipe 10 is fixedly connected to the end of the steam output pipe 4 away from the distillation tank 2. A cooler 7 for cooling the transmission pipe 10 is fixedly installed on the outer wall of the transmission pipe 10.

[0030] The transmission pipe 10 is provided with a corrugated pipe 11 that can extend and retract along the axial direction of the transmission pipe 10. The outer wall of the corrugated pipe 11 is attached to the inner top wall of the transmission pipe 10. The drive unit is provided at one end of the corrugated pipe 11 and includes at least a freely stretchable connecting rope 15. One end of the connecting rope 15 is fixedly connected to one end of the corrugated pipe 11, and the other end extends to the outside of the transmission pipe 10.

[0031] A connecting pipe 8 is fixedly connected between the transfer pipe 10 and the methylimidazole recovery box 1.

[0032] The distillation tank 2 contains a 1-methylimidazole mother liquor. The distillation tank 2 distills the 1-methylimidazole mother liquor, causing it to vaporize. The vaporized 1-methylimidazole mother liquor then floats into the steam output pipe 4 and enters the transmission pipe 10. The cooler 7 condenses the transmission pipe 10, thereby lowering the temperature inside the transmission pipe 10. Since the corrugated pipe 11 is in contact with the inner wall of the transmission pipe 10, the cold air is transferred to the corrugated pipe 11, causing the temperature of the corrugated pipe 11 itself to decrease.

[0033] Then, after the vaporized 1-methylimidazole mother liquor in the transmission pipe 10 comes into contact with the inner wall of the bellows 11, the bellows 11 will carry away the heat of the gas through the cooling medium, so that the temperature of the high-temperature 1-methylimidazole vapor will be reduced. When the temperature drops below the boiling point of 1-methylimidazole, the intensity of the thermal motion of the vapor molecules will be greatly reduced, and the attraction between molecules will begin to play a dominant role, causing the molecules to gradually aggregate to form a liquid. Then the liquid will adhere to the inner wall of the bellows 11.

[0034] Then, the connecting rope 15 is repeatedly pulled and released. When the connecting rope 15 is pulled, one end of the bellows 11 is fixed inside the transmission pipe 10, and the other end is stretched after being pulled by the connecting rope 15. After the connecting rope 15 is released, the bellows 11 will retract. This is because the bellows 11 usually has a special pleated structure. These pleats can be stretched and compressed in the axial direction. When the bellows 11 is pulled, the pleats are stretched, and the overall length of the bellows 11 increases, thereby achieving stretching. When the external force is released, the pleats will return to their original shape under the action of their own elastic restoring force, causing the bellows 11 to contract.

[0035] When the bellows 11 is stretched and contracted, the liquid on the bellows 11 will maintain its original state of motion due to its own inertia, while the surface of the bellows 11 is moving rapidly. The liquid droplets and the surface of the bellows 11 will generate relative motion. This relative motion causes the liquid to be subjected to a frictional force in the opposite direction to the movement of the bellows 11. When this frictional force reaches a certain level, it will overcome the adhesion between the liquid and the surface of the bellows 11, causing the liquid to fall off, thereby achieving the rapid removal of the liquid adhering to the bellows 11.

[0036] The liquid then drips into the transfer tube 10, flows along the transfer tube 10 into the connecting tube 8, and finally flows into the methylimidazole recovery tank 1 through the connecting tube 8 to complete the collection.

[0037] See Figures 2-5 The drive unit also includes a port 17, which is opened on the transmission pipe 10. An exhaust pipe 9 is fixedly installed on the inner wall of the port 17. An installation ring 19 is fixedly installed on the inner wall of the exhaust pipe 9. Multiple elastic ropes 20 are fixedly installed on the top of the installation ring 19. An elastic cloth 21 is fixedly connected between the top ends of the multiple elastic ropes 20. The end of the connecting rope 15 away from the corrugated pipe 11 is fixedly connected to the bottom of the elastic cloth 21. An electric valve 5 is fixedly connected to the steam output pipe 4.

[0038] After the 1-methylimidazole vapor is condensed into water by the condenser, an outlet channel is still needed because there are often some non-condensable gases in the vapor. The outlet pipe 9 serves as the outlet channel for these gases. Both the elastic cloth 21 and the elastic rope 20 are made of elastic material. When the gas enters the outlet pipe 9, the elastic cloth 21 will gradually expand upward as the gas is compressed until it expands to the outside of the outlet pipe 9. Then the gas can float to the outside through the gap between the elastic cloth 21 and the outlet pipe 9. During the expansion of the elastic cloth 21, the elastic rope 20 will also be stretched upward to prevent the elastic cloth 21 from floating into the air.

[0039] The electric valve 5 is equipped with a dedicated timer controller, which allows the electric valve 5 to be opened and closed at timed intervals. When the electric valve 5 is closed, a certain amount of steam will accumulate in the distillation tank 2 and the steam output pipe 4. When the electric valve 5 is opened, this large amount of steam will immediately enter the transmission pipe 10. Before setting the opening and closing of the electric valve 5, the interval time of the electric valve 5 needs to be set to ensure that this steam will not accumulate to the extent that the steam output pipe 4 will explode.

[0040] Furthermore, the electric valve 5 ensures that gas can only enter the transmission pipe 10 through the steam output pipe 4, and gas cannot enter the steam output pipe 4 through the transmission pipe 10. Since the methylimidazole recovery box 1 is in a sealed state when closed, steam entering the methylimidazole recovery box 1 cannot be discharged. Therefore, the steam can only exit through the gas outlet pipe 9, allowing the steam to enter the transmission pipe 10 intermittently. This serves two purposes: first, to prevent the continuous entry of steam into the transmission pipe 10, which would prevent the transmission pipe 10 from condensing the 1-methylimidazole vapor in time; and second, to allow the elastic cloth 21 to bulge intermittently. After bulging, the elastic cloth 21 will contract back to its original position because the gas is no longer being transported, and then bulge and contract again. In this way, the elastic cloth 21 can intermittently pull the connecting rope 15, and then the connecting rope 15 will pull the corrugated pipe 11 and then release it, and then pull and release it again, realizing the extension and contraction of the corrugated pipe 11.

[0041] See Figures 2-4 A fixing ring 12 and a fixing plate 13 are fixedly installed on the inner wall of the transmission pipe 10. Two connecting rods 14 are fixedly installed between the fixing plate 13 and the fixing ring 12. The outer wall of the connecting rod 14 abuts against the edge of the corrugated pipe 11.

[0042] The fixing ring 12 and the fixing plate 13 are fixed inside the transmission pipe 10 to support the bellows 11, so that the bellows 11 is fixed in the upper part of the transmission pipe 10. The connecting rod 14 supports the two sides of the bellows 11 to prevent the bellows 11 from collapsing and falling. When the bellows 11 extends or retracts, it slides along the outer wall of the connecting rod 14.

[0043] See Figure 4 A support rod 18 is fixedly connected between the fixing plate 13 and the fixing ring 12, and the outer wall of the support rod 18 abuts against the inner wall of the corrugated pipe 11.

[0044] The support rod 18 is fixed between the fixing ring 12 and the fixing plate 13. One end of the support rod 18 is fixedly connected to the outer wall of the fixing ring 12, and the other end is fixedly connected to the outer wall of the fixing plate 13. The support rod 18 supports the inner top wall of the corrugated pipe 11, thus preventing the corrugated pipe 11 from tilting and falling.

[0045] See Figures 2-4 One end of the corrugated pipe 11 is fixedly connected to the outer wall of the fixed ring 12, and the other end is fixedly installed with a support plate 16. The support plate 16 is slidably connected to the outer wall of the connecting rod 14.

[0046] The support plate 16 fixes one end of the bellows 11, enabling the bellows 11 to maintain its position. Figure 3 The bellows 11 is in a curved state and the support plate 16 moves together with the contraction of the bellows 11. When the support plate 16 moves, it slides along the outer wall of the connecting rod 14, making the bellows 11 more stable when it moves.

[0047] See Figure 6 The fixing plate 13 has an insertion hole 6, and the end of the connecting rope 15 away from the elastic cloth 21 passes through the insertion hole 6 and is fixedly connected to the outer wall of the support plate 16.

[0048] The insertion hole 6 provides space for the connecting rope 15 to pass through the fixing plate 13, so that the connecting rope 15 can pass over the fixing plate 13 and connect to the support plate 16, thereby pulling the support plate 16 and the corrugated pipe 11, and extending the corrugated pipe 11 by pulling the support plate 16.

[0049] See Figure 6 An anti-wear pad 3 is fixedly installed on the inner wall of the socket 6, and the outer wall of the connecting rope 15 abuts against the inner wall of the anti-wear pad 3.

[0050] Because the connecting rope 15 will slide along the inside of the socket 6 when it is repeatedly pulled, it will cause wear to the connecting rope 15. The anti-wear pad 3 is made of a softer material, so the anti-wear pad 3 separates the connecting rope 15 from the inner wall of the socket 6 to prevent the socket 6 from causing wear to the connecting rope 15.

[0051] See Figure 5 A wear-resistant pad 22 is fixedly installed at the bottom of the air outlet pipe 9, and one end of the connecting rope 15 extends past the wear-resistant pad 22 into the interior of the air outlet pipe 9.

[0052] Similarly, when the connecting rope 15 is repeatedly pulled, it will also rub against the bottom end of the air pipe 9. The wear-resistant pad 22 has the same function as the anti-wear pad 3. The wear-resistant pad 22 separates the connecting rope 15 from the bottom end of the air pipe 9 to prevent wear from occurring between the repeatedly moving connecting rope 15 and the air pipe 9 due to friction.

Claims

1. A device for recovering 1-methylimidazole mother liquor, comprising a methylimidazole recovery tank (1) and a distillation tank (2), characterized in that, The top of the distillation tank (2) is connected to a steam output pipe (4), and the end of the steam output pipe (4) away from the distillation tank (2) is connected to an inclined transmission pipe (10). The outer wall of the transmission pipe (10) is equipped with a cooler (7) for cooling the transmission pipe (10). The transmission pipe (10) is provided with a corrugated pipe (11) that can extend and retract along the axial direction of the transmission pipe (10), and the outer wall of the corrugated pipe (11) is attached to the inner top wall of the transmission pipe (10). The drive unit is located at one end of the bellows (11) and includes at least a freely stretchable connecting rope (15). One end of the connecting rope (15) is connected to one end of the bellows (11), and the other end extends to the outside of the transmission pipe (10). A connecting pipe (8) is connected between the transmission pipe (10) and the methylimidazole recovery tank (1).

2. The 1-methylimidazole mother liquor recovery device as described in claim 1, characterized in that: The drive unit also includes a port (17) on the transmission pipe (10), an outlet pipe (9) is installed on the inner wall of the port (17), an installation ring (19) is installed on the inner wall of the outlet pipe (9), a plurality of elastic ropes (20) are installed on the top of the installation ring (19), an elastic cloth (21) is connected between the top ends of the plurality of elastic ropes (20), the end of the connecting rope (15) away from the corrugated pipe (11) is connected to the bottom of the elastic cloth (21), and an electric valve (5) is connected to the steam output pipe (4).

3. The 1-methylimidazole mother liquor recovery device as described in claim 2, characterized in that: The inner wall of the transmission pipe (10) is fitted with a fixing ring (12) and a fixing plate (13). Two connecting rods (14) are installed between the fixing plate (13) and the fixing ring (12). The outer wall of the connecting rod (14) abuts against the edge of the corrugated pipe (11).

4. The 1-methylimidazole mother liquor recovery device as described in claim 3, characterized in that: A support rod (18) is connected between the fixing plate (13) and the fixing ring (12), and the outer wall of the support rod (18) abuts against the inner wall of the corrugated pipe (11).

5. The 1-methylimidazole mother liquor recovery device as described in claim 4, characterized in that: One end of the corrugated pipe (11) is connected to the outer wall of the fixed ring (12), and the other end is equipped with a support plate (16). The support plate (16) is slidably connected to the outer wall of the connecting rod (14).

6. The 1-methylimidazole mother liquor recovery device as described in claim 5, characterized in that: The fixing plate (13) has an insertion hole (6), and the end of the connecting rope (15) away from the elastic cloth (21) passes through the insertion hole (6) and connects to the outer wall of the support plate (16).

7. The 1-methylimidazole mother liquor recovery device as described in claim 6, characterized in that: The inner wall of the insertion hole (6) is fitted with an anti-wear pad (3), and the outer wall of the connecting rope (15) abuts against the inner wall of the anti-wear pad (3).

8. The 1-methylimidazole mother liquor recovery device as described in claim 7, characterized in that: A wear-resistant pad (22) is installed at the bottom of the air outlet pipe (9), and one end of the connecting rope (15) extends past the wear-resistant pad (22) into the interior of the air outlet pipe (9).

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