Vacuum rectification device for methyl pyrrolidone

Abstract

The vacuum rectification device comprises a rectification tank and a condensation tank, a vacuum pump is arranged on one side of the rectification tank, a heating cylinder is arranged outside the rectification tank, a plurality of stirring rods are arranged on the peripheral side of a fixing rod, lifting mechanisms are symmetrically arranged on the two sides in the rectification tank, and each lifting mechanism comprises a fixing frame. A first motor is arranged in the fixing frame, threaded blocks are in threaded connection with the threaded rods, a moving ring is arranged between the two sets of threaded blocks, a baffle is slidably connected to one side of the scooping barrel, a storage box is arranged at the lower end of the scooping barrel, a condensation pipe is arranged in the condensation tank, one end of the condensation pipe communicates with an air outlet pipe, and the other end of the condensation pipe communicates with a liquid outlet pipe. By arranging the lifting mechanism, the scooping barrel, the baffle and the convex block, liquid raw materials are lifted from the bottom to the top and can be poured out of the scooping barrel along with descending of the baffle, the reaction evaporation area of the liquid raw materials is increased, the rectification efficiency is improved, the rectification effect is good, and the practicability is high.

Description

Technical Field

[0001] The utility model relates to the technical field of vacuum distillation, in particular to a vacuum distillation device for methyl pyrrolidone. Background Art

[0002] Methylpyrrolidone, alias: NMP; 1-methyl-2-pyrrolidone; N-methyl-2-pyrrolidone. NMP is a polar aprotic solvent with the advantages of high boiling point, strong affinity, low toxicity, low volatility, excellent chemical and thermal stability, strong dissolving ability, and recyclability. It has now become an indispensable organic solvent in the lithium battery industry.

[0003] In the distillation and purification process of the existing vacuum distillation device, the liquid raw material is piled up at the bottom, the evaporation area of ​​the heated distilled raw liquid is small, and only a small amount of stirring is performed on the bottom liquid raw material, resulting in poor distillation efficiency, limited improvement on the distillation effect, and poor practicality. Utility Model Content

[0004] The utility model aims to provide a vacuum distillation device for methyl pyrrolidone to solve the above technical problems.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a vacuum distillation device for methyl pyrrolidone, comprising a distillation tank and a condensation tank, a vacuum pump is arranged on one side of the distillation tank, a feed pipe is arranged on the upper end surface of the distillation tank, a discharge pipe is arranged on the lower end of the distillation tank, a heating cylinder is arranged outside the distillation tank, a plurality of heating elements are arranged inside the heating cylinder, a fixed rod is arranged at the bottom end of the distillation tank, a plurality of stirring rods are arranged around the fixed rod, a lifting mechanism is symmetrically arranged on both sides of the distillation tank, the lifting mechanism comprises a fixed frame, a first motor is arranged inside the fixed frame, a threaded rod is fixedly connected to the output end of the first motor, and the other end of the threaded rod is rotatably connected to the fixed frame The threaded rod is threadedly connected with a threaded block, a movable ring is arranged between the two groups of threaded blocks, a plurality of scooping barrels are arranged on the movable ring, a baffle is slidably connected to one side of the scooping barrel, a storage box is arranged at the lower end of the scooping barrel, a second connecting rod is arranged on one side of the inner wall of the distillation tank, the other end of the second connecting rod is connected to the first connecting rod, a support frame is arranged at the bottom end of the first connecting rod, a fixing ring is arranged on the outside of the support frame, a connecting frame is arranged between the distillation tank and the condensation tank, an air outlet pipe is arranged in communication between the distillation tank and the condensation tank, a condensing pipe is arranged in the condensing tank, one end of the condensing pipe is connected to the air outlet pipe, and the other end of the condensing pipe is connected to a liquid outlet pipe.

[0006] Preferably, second slide grooves are symmetrically provided on both sides of the baffle, a second slider is slidably connected in the second slide groove, the second slider is fixedly connected to the baffle, the baffle is adapted to the storage box, and a spring is provided between the bottom end of the baffle and the storage box.

[0007] Preferably, a plurality of protrusions are provided on the fixing ring, and the protrusions are matched with the baffle.

[0008] Preferably, a first sliding groove is provided on one side of the fixing frame, and the first sliding groove is slidably connected to the threaded block.

[0009] Preferably, a water inlet pipe is provided at the upper end of the condensation tank, and a water outlet pipe is provided at the lower end of the condensation tank.

[0010] Preferably, a valve is provided on the air outlet pipe.

[0011] Preferably, a second motor is arranged outside the distillation tank, and an output end of the second motor is fixedly connected to the fixing rod.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] By setting a lifting mechanism, a scooping barrel, a baffle and a convex block, the liquid raw material is lifted from the bottom to the top, and the liquid raw material will be poured out from the scooping barrel as the baffle descends, thereby increasing the reaction evaporation area of ​​the liquid raw material, improving the efficiency of distillation, and having a good distillation effect and high practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0015] Figure 1 Schematic diagram of the structure of a vacuum distillation device for methyl pyrrolidone in this embodiment;

[0016] Figure 2 Schematic diagram of the internal structure of the distillation tank in this embodiment;

[0017] Figure 3 is a schematic structural diagram of the fixing ring of this embodiment;

[0018] Figure 4 It is a schematic diagram of the internal structure of the scoop barrel of this embodiment.

[0019] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0020] 1. Distillation tank; 2. Vacuum pump; 3. First motor; 4. Threaded rod; 5. Fixed frame; 6. First slide groove; 7. Moving ring; 8. Baffle; 9. Scooping barrel; 10. Threaded block; 11. Spring; 12. Storage box; 13. Stirring rod; 14. Fixed rod; 15. Heating element; 16. Heating barrel; 17. Discharge pipe; 18. Feed pipe; 19. Bump; 20. Fixed ring; 21. First connecting rod; 22. Valve; 23. Second connecting rod; 24. Air outlet pipe; 25. Connecting frame; 26. Water inlet pipe; 27. Condenser; 28. Condensation tank; 29. ​​Liquid outlet pipe; 30. Water outlet pipe; 31. Support frame; 32. Second slide groove; 33. Sliding block; 34. Second motor. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] See also Figure 1-4 The utility model provides a technical solution: a vacuum distillation device for methyl pyrrolidone, comprising a distillation tank 1 and a condensation tank 28, a vacuum pump 2 is arranged on one side of the distillation tank 1, a feed pipe 18 is arranged on the upper end surface of the distillation tank 1, a discharge pipe 17 is arranged on the lower end of the distillation tank 1, a heating cylinder 16 is arranged outside the distillation tank 1, a plurality of heating elements 15 are arranged inside the heating cylinder 16, a fixed rod 14 is arranged at the bottom end of the distillation tank 1, a plurality of stirring rods 13 are arranged around the fixed rod 14, a lifting mechanism is symmetrically arranged on both sides of the distillation tank 1, the lifting mechanism comprises a fixed frame 5, a first motor 3 is arranged in the fixed frame 5, a threaded rod 4 is fixedly connected to the output end of the first motor 3, the other end of the threaded rod 4 is rotatably connected to the fixed frame 5, and the threaded rod 4 is rotatably connected to the fixed frame 5. A threaded block 10 is connected to the upper thread, a movable ring 7 is arranged between the two groups of threaded blocks 10, a plurality of scooping barrels 9 are arranged on the movable ring 7, a baffle 8 is slidably connected to one side of the scooping barrel 9, a storage box 12 is arranged at the lower end of the scooping barrel 9, a second connecting rod is arranged on one side of the inner wall of the distillation tank 1, the other end of the second connecting rod is connected to the first connecting rod 21, a support frame 31 is arranged at the bottom of the first connecting rod 21, a fixing ring 20 is arranged on the outer side of the support frame 31, a connecting frame 25 is arranged between the distillation tank 1 and the condensation tank 28, an air outlet pipe 24 is arranged between the distillation tank 1 and the condensation tank 28, a condensation pipe 27 is arranged in the condensation tank 28, one end of the condensation pipe 27 is connected to the air outlet pipe 24, and the other end of the condensation pipe 27 is connected to the liquid outlet pipe 29.

[0023] Specifically, second slide grooves 32 are symmetrically arranged on both sides of the baffle 8, and a second slider 33 is slidably connected in the second slide grooves 32. The second slider 33 is fixedly connected to the baffle 8, and the baffle 8 is adapted to the storage box 12. A spring 11 is arranged between the bottom end of the baffle 8 and the storage box 12, and a plurality of protrusions 19 are arranged on the fixing ring 20, and the protrusion 19 is adapted to the baffle 8. When the lifting mechanism moves the scooping barrel 9 upward to the position of the protrusion 19, the protrusion 19 squeezes the baffle 8 downward and slides downward under the cooperation of the second slide grooves 32 and the second slider 33. At this time, the baffle 8 squeezes the spring 11, and the baffle 8 is also received in the storage box 12. The liquid raw material will be poured out from the scooping barrel 9 as the baffle 8 descends, thereby increasing the reaction evaporation area of ​​the liquid raw material and improving the efficiency of distillation.

[0024] Specifically, a first slide groove 6 is provided on one side of the fixed frame 5 , and the first slide groove 6 is slidably connected to the threaded block 10 . Starting the first motor 2 drives the threaded rod 4 to rotate, and at the same time drives the threaded block 10 to move up and down along the first slide groove 6 .

[0025] Specifically, a water inlet pipe 26 is provided at the upper end of the condensation tank 28, and a water outlet pipe 30 is provided at the lower end of the condensation tank 28. Cold water enters the condensation tank 28 from the water inlet pipe 26 to cool the condensation pipe 27. When the temperature of the cold water rises, the cold water is discharged from the water outlet pipe 30.

[0026] Specifically, a valve 22 is provided on the gas outlet pipe 24 to control the flow of the distilled gas.

[0027] Specifically, a second motor 34 is provided outside the distillation tank 1, and an output end of the second motor 34 is fixedly connected to the fixed rod 14. Starting the second motor 34 drives the fixed rod 14 to rotate, thereby driving the stirring rod 13 to stir the liquid raw material, thereby accelerating the efficiency of distillation.

[0028] A specific application example of this embodiment is:

[0029] When the device is in use, the liquid raw material is poured into the distillation tank 1 from the feed pipe 18, the vacuum pump 2 is turned on to make the inside of the distillation tank 1 a vacuum state, the heating element 15 in the heating cylinder 16 is turned on to heat the liquid raw material in the distillation tank 1, the second motor 34 is started to drive the fixed rod 14 to rotate, thereby driving the stirring rod 13 to stir the liquid raw material, at this time, the scooping barrel 9 is in the liquid raw material, the first motor 2 is started to drive the threaded rod 4 to rotate, and at the same time drives the threaded block 10 to move upward along the first slide groove 6, thereby driving the moving ring 7 and the scooping barrel 9 to move upward, when the scooping material When the barrel 9 moves upward to the position of the protrusion 19, the protrusion 9 presses the baffle 8 downward and slides downward with the cooperation of the second slide groove 32 and the second slider 33. At this time, the baffle 8 squeezes the spring 11, and the baffle 8 is also received in the storage box 12. The liquid raw material will be poured out from the scooping barrel 9 as the baffle 8 descends, thereby increasing the reaction evaporation area of ​​the liquid raw material and improving the efficiency of distillation. The valve 22 is opened, and the distilled methylpyrrolidone gas enters the condenser 27 through the gas outlet pipe 24 for condensation, and finally the distilled methylpyrrolidone liquid is discharged from the liquid outlet pipe 29.

[0030] In the description of the present invention, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "both ends" and the like indicate orientations or positional relationships based on the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0031] In the present utility model, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the utility model according to the specific circumstances.

[0032] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that modifications may be made to the embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A vacuum distillation device for methyl pyrrolidone, characterized in that: The invention comprises a distillation tank (1) and a condensation tank (28), wherein a vacuum pump (2) is arranged on one side of the distillation tank (1), a feed pipe (18) is arranged on the upper end surface of the distillation tank (1), and a discharge pipe (17) is arranged on the lower end of the distillation tank (1). A heating cylinder (16) is arranged outside the distillation tank (1), and a plurality of heating elements (15) are arranged inside the heating cylinder (16). A fixing rod (14) is arranged at the bottom end of the distillation tank (1), and a plurality of stirring rods (13) are arranged around the fixing rod (14). A lifting mechanism is symmetrically arranged on both sides of the distillation tank (1), and the lifting mechanism comprises a fixing frame (5), and a first motor (3) is arranged inside the fixing frame (5). A threaded rod (4) is fixedly connected to the output end of the first motor (3), and the other end of the threaded rod (4) is rotatably connected to the fixing frame (5). A threaded block (10) is threadedly connected to the threaded rod (4), and the two sets of threaded blocks are arranged on the threaded rod (4). A moving ring (7) is provided between the pattern blocks (10), a plurality of scoop barrels (9) are provided on the moving ring (7), a baffle (8) is slidably connected to one side of the scoop barrel (9), a storage box (12) is provided at the lower end of the scoop barrel (9), a second connecting rod is provided at one side of the inner wall of the distillation tank (1), the other end of the second connecting rod is connected to the first connecting rod (21), a support frame (31) is provided at the bottom end of the first connecting rod (21), a fixing ring (20) is provided on the outer side of the support frame (31), a connecting frame (25) is provided between the distillation tank (1) and the condensation tank (28), an air outlet pipe (24) is provided between the distillation tank (1) and the condensation tank (28), a condensation pipe (27) is provided in the condensation tank (28), one end of the condensation pipe (27) is connected to the air outlet pipe (24), and the other end of the condensation pipe (27) is provided to communicate with a liquid outlet pipe (29).

2. A vacuum distillation device for methyl pyrrolidone according to claim 1, characterized in that: Second slide grooves (32) are symmetrically arranged on both sides of the baffle plate (8), a second slide block (33) is slidably connected in the second slide groove (32), the second slide block (33) is fixedly connected to the baffle plate (8), the baffle plate (8) is adapted to the storage box (12), and a spring (11) is arranged between the bottom end of the baffle plate (8) and the storage box (12).

3. A vacuum distillation device for methyl pyrrolidone according to claim 1, characterized in that: A plurality of protrusions (19) are provided on the fixing ring (20), and the protrusions (19) are adapted to fit the baffle (8).

4. A vacuum distillation device for methyl pyrrolidone according to claim 1, characterized in that: A first sliding groove (6) is provided on one side of the fixing frame (5), and the first sliding groove (6) is slidably connected to the threaded block (10).

5. A vacuum distillation device for methyl pyrrolidone according to claim 1, characterized in that: The upper end of the condensation tank (28) is provided with a water inlet pipe (26), and the lower end of the condensation tank (28) is provided with a water outlet pipe (30).

6. A vacuum distillation device for methyl pyrrolidone according to claim 1, characterized in that: The air outlet pipe (24) is provided with a valve (22).

7. The vacuum distillation device for methyl pyrrolidone according to claim 1, characterized in that: A second motor (34) is arranged outside the rectification tank (1), and an output end of the second motor (34) is fixedly connected to the fixing rod (14).

Images