Feed pretreatment device for methyl acetate distillation tower

Abstract

The utility model discloses a feed pretreatment device for a methyl acetate distillation tower, and particularly relates to the technical field of ethyl acetate preparation equipment, the feed pretreatment device comprises a workbench, a pretreatment box is clamped at the top of the workbench, fixing plates are fixedly arranged on two sides of the pretreatment box, and the fixing plates are connected with the workbench through bolts. A stirring mechanism is arranged in the pretreatment box and comprises a supporting plate fixedly arranged on one side of the pretreatment box, a motor is fixedly arranged at the top of the supporting plate, a rotating shaft is fixedly arranged at the output end of the motor, a plurality of stirring blades are fixedly arranged on the surface of the rotating shaft, and the surfaces of the stirring blades are inclined; a plurality of clamping grooves are formed in the inner wall of the pretreatment box. According to the pretreatment tank, waste gas and waste liquid can be conveniently stirred and guided, so that enough contact time and contact area of the waste gas and the waste liquid in the pretreatment tank are ensured, and the effect of fully mixing is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of ethyl acetate preparation equipment, and more specifically, to a feed pretreatment device for a methyl acetate distillation tower. Background Art

[0002] During the production process of polyvinyl alcohol and terephthalic acid, a large amount of waste liquid and waste gas containing methyl acetate will be generated. For these chemical products, the more common treatment method is to directly pass the waste liquid and waste gas containing methyl acetate into the distillation tower, and obtain methyl acetate through processes such as azeotropic distillation, adsorption distillation, condensation reflux and desorption regeneration.

[0003] In the existing mechanism, the discharged substance is in both liquid and gaseous forms and is then directly fed into the distillation tower. This not only prolongs the reaction time of the distillation tower, but also makes it difficult for the purity of the produced methyl acetate to meet production standards.

[0004] A search revealed that a Chinese patent with authorization publication number CN212119066U discloses a feed pretreatment device for a methyl acetate distillation tower. This device can introduce waste liquid and waste gas containing methyl acetate generated during the production of polyvinyl alcohol and terephthalic acid into a pretreatment tank. By allowing the waste gas and waste liquid to fully merge, the concentration of methyl acetate in the waste liquid is increased. This allows the methyl acetate in the waste gas to be fully recycled, and also allows the waste liquid to enter the distillation tower body, eliminating the need for the distillation tower to spend extended time extracting methyl acetate from the waste gas. Consequently, the overall distillation effect is significantly improved, resulting in higher efficiency.

[0005] However, in actual use, this structure introduces waste liquid and waste gas into the pretreatment tank together for fusion, thereby increasing the concentration of methyl acetate in the waste liquid. Since the waste gas is directly discharged through the air outlet and contacts the waste liquid, the waste gas and waste liquid lack sufficient contact time and contact area in the pretreatment tank, resulting in poor mixing effect, which in turn affects the use effect. Utility Model Content

[0006] In order to overcome the above-mentioned defects of the prior art, the present invention provides a feed pretreatment device for a methyl acetate distillation tower to solve the problems raised in the above-mentioned background technology.

[0007] To achieve the above objectives, the present invention provides the following technical solutions:

[0008] A feed pretreatment device for a methyl acetate distillation column includes a workbench with a pretreatment box clamped on the top of the workbench, fixed plates fixedly provided on both sides of the pretreatment box, the fixed plates being connected to the workbench by bolts, and a stirring mechanism provided inside the pretreatment box;

[0009] The stirring mechanism includes a support plate fixedly arranged on one side of the pretreatment box, a motor is fixedly arranged on the top of the support plate, a rotating shaft is fixedly arranged on the output end of the motor, a plurality of stirring blades are fixedly arranged on the surface of the rotating shaft, and the surfaces of the plurality of stirring blades are all arranged in an inclined shape. The inner wall of the pretreatment box is provided with a plurality of slots, and the interiors of the plurality of slots are all clamped with a clamping strip, and a guide plate is fixedly arranged on the top of the clamping strip, and the surface of the guide plate is arranged in an arc shape.

[0010] By adopting the above technical solution: in order to facilitate the stirring and diversion of waste gas and waste liquid, it is ensured that the waste gas and waste liquid have sufficient contact time and contact area in the pretreatment tank, thereby achieving the effect of sufficient mixing.

[0011] As a further description of the above technical solution: two fixing grooves are opened inside the pretreatment box, and the interiors of the two fixing grooves are slidably connected with partitions. The bottom of the partition is provided with multiple stabilizing grooves, and the multiple stabilizing grooves are all connected to the guide plate. The surface of the partition is provided with multiple air holes, and the partition and the pretreatment box are connected by bolts.

[0012] By adopting the above technical solution: in order to facilitate the installation and disassembly of the partition and the guide plate, and thus facilitate cleaning and maintenance.

[0013] As a further description of the above technical solution: a processing mechanism is fixedly arranged inside the pretreatment box, and the processing mechanism includes an air inlet pipe that is arranged through one side of the pretreatment box, and a plurality of fixed cylinders are fixedly arranged at the bottom of the air inlet pipe, and the interiors of the plurality of fixed cylinders are all threadedly connected with air guide pipes, and a plurality of exhaust holes are provided on the surface of the air guide pipe, and a liquid inlet pipe is arranged through one side of the pretreatment box, and the liquid inlet pipe is arranged at the bottom of the air inlet pipe.

[0014] By adopting the above technical solution: in order to enable the waste gas and waste liquid to enter the pretreatment tank separately and stably, to ensure the smooth progress of the fusion process.

[0015] As a further description of the above technical solution: a liquid outlet pipe is fixedly provided on one side of the pretreatment box, a water pump is fixedly provided on one side of the liquid outlet pipe, a connecting pipe is fixedly provided on the output end of the water pump, a distillation tower body is fixedly provided on one end of the connecting pipe, a sealed box door is hingedly provided on one side of the pretreatment box, an air outlet pipe is fixedly provided on the top of the pretreatment box, and fixed valves are fixedly provided on one side of the air outlet pipe, the air inlet pipe, the liquid inlet pipe and the liquid outlet pipe.

[0016] By adopting the above technical solution, not only the concentration of methyl acetate in the waste liquid is increased, but also a good foundation is laid for subsequent distillation treatment.

[0017] Technical effects and advantages of this utility model:

[0018] By providing a stirring mechanism, compared with the prior art, a starting motor drives a rotating shaft to rotate in a forward direction, and the rotating shaft drives a plurality of stirring blades to rotate, and the surfaces of the stirring blades are arranged in an inclined shape, thereby driving the waste liquid and the waste gas to stir, and driving the waste liquid and the waste gas to rotate and move toward the side close to the guide plate. Then, while contacting the guide plate, the plurality of guide plates form a guide route, so that the waste liquid and the waste gas are fully in contact, driving the methyl acetate in the waste gas to dissolve in the waste liquid, increasing the concentration of methyl acetate in the waste liquid, so as to achieve full mixing of the gas and the liquid, and conveniently removing the guide plate inside the pretreatment box for cleaning or replacement, and the operation is convenient and quick;

[0019] By setting up a treatment mechanism, compared with the existing technology, the waste liquid is opened by opening the fixed valve on one side of the liquid inlet pipe, so that the waste liquid enters the interior of the pretreatment box through the liquid inlet pipe, and then the fixed valve on the side of the air inlet pipe is opened, so that the waste gas passes through the air inlet pipe into the interior of the fixed cylinder, and is transported to the interior of the air guide pipe through the fixed cylinder, and then is discharged through multiple exhaust holes opened on the surface of the air guide pipe, so that the waste gas enters the interior of the pretreatment box and is preliminarily mixed with the waste liquid, and the treated waste gas floats upward through the air holes on the partition and enters the air outlet pipe for discharge, which is convenient for later maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0021] Figure 2 This is a schematic structural diagram of the stirring mechanism of the present utility model.

[0022] Figure 3 It is a schematic diagram of the overall rear cross-sectional structure of the present invention.

[0023] Figure 4 It is a schematic diagram of the front cross-sectional structure of the present utility model.

[0024] Figure 5 It is a side cross-sectional structural schematic diagram of the utility model.

[0025] Figure 6 This is a schematic diagram of the processing mechanism structure of the present utility model.

[0026] The accompanying drawings are marked as follows: 1. workbench; 2. pretreatment box; 3. fixed plate; 4. support plate; 5. motor; 6. rotating shaft; 7. stirring blade; 8. slot; 9. clamping bar; 10. guide plate; 11. fixed groove; 12. partition; 13. stabilizing groove; 14. air vent; 15. air inlet pipe; 16. fixed cylinder; 17. air guide pipe; 18. exhaust hole; 19. liquid inlet pipe; 20. liquid outlet pipe; 21. water pump; 22. distillation tower body; 23. sealed box door; 24. air outlet pipe. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] The embodiments of this application disclose Figure 1-6 The feed pretreatment device for a methyl acetate distillation column shown in the figure includes a workbench 1, a pretreatment box 2 is clamped on the top of the workbench 1, and fixing plates 3 are fixedly installed on both sides of the pretreatment box 2. The fixing plates 3 are connected to the workbench 1 by bolts. A stirring mechanism is provided inside the pretreatment box 2.

[0029] The stirring mechanism includes a support plate 4 fixedly arranged on one side of the pretreatment box 2, a motor 5 is fixedly arranged on the top of the support plate 4, a rotating shaft 6 is fixedly arranged on the output end of the motor 5, a plurality of stirring blades 7 are fixedly arranged on the surface of the rotating shaft 6, and the surfaces of the plurality of stirring blades 7 are all arranged in an inclined shape. The inner wall of the pretreatment box 2 is provided with a plurality of slots 8, and the interior of the plurality of slots 8 is clamped with a card strip 9, and a guide plate 10 is fixedly arranged on the top of the card strip 9. The surface of the guide plate 10 is arranged in an arc shape. When the motor 5 is started, the rotating shaft 6 is driven to rotate in the forward direction, and the rotating shaft 6 drives the plurality of stirring blades 7 to rotate. The surface of the stirring blade 7 is arranged in an inclined shape, thereby driving the waste liquid and the waste gas to be stirred, and driving the waste liquid and the waste gas to rotate and move toward the side close to the guide plate 10. Then, while contacting the guide plate 10, the plurality of guide plates 10 form a diversion route, so that the waste liquid and the waste gas are fully in contact, driving the methyl acetate in the waste gas to dissolve in the waste liquid, and increasing the concentration of methyl acetate in the waste liquid to achieve full mixing of the gas and the liquid.

[0030] Reference Figure 2-3As shown, the interior of the pretreatment box 2 is provided with two fixed grooves 11, and the interiors of the two fixed grooves 11 are slidably connected with a partition 12, and the bottom of the partition 12 is provided with a plurality of stable grooves 13, and the plurality of stable grooves 13 are all snap-connected with the guide plate 10, and the surface of the partition 12 is provided with a plurality of air holes 14. The partition 12 and the pretreatment box 2 are connected by bolts, and the waste liquid is opened by opening the fixed valve on one side of the liquid inlet pipe 19, so that the waste liquid enters the interior of the pretreatment box 2 through the liquid inlet pipe 19, and then opens the fixed valve on one side of the air inlet pipe 15, so that the waste gas enters the interior of the fixed cylinder 16 through the air inlet pipe 15, and is transported to the interior of the air guide pipe 17 through the fixed cylinder 16, and then is discharged through the plurality of exhaust holes 18 opened on the surface of the air guide pipe 17, so that the waste gas enters the interior of the pretreatment box 2 and is preliminarily mixed with the waste liquid.

[0031] Reference Figure 3-4 As shown, a processing mechanism is fixedly provided inside the pretreatment box 2, and the processing mechanism includes an air inlet pipe 15 which is arranged on one side of the pretreatment box 2, and a plurality of fixed cylinders 16 are fixedly provided on the bottom of the air inlet pipe 15. The interiors of the plurality of fixed cylinders 16 are all threadedly connected with air guide pipes 17, and a plurality of exhaust holes 18 are provided on the surface of the air guide pipe 17. A liquid inlet pipe 19 is arranged on one side of the pretreatment box 2, and the liquid inlet pipe 19 is arranged at the bottom of the air inlet pipe 15. The treated waste gas floats upward through the air holes 14 on the partition 12 and enters the top of the pretreatment box 2. Then, by opening the fixed valve on one side of the air outlet pipe 24, the treated waste gas is discharged out of the pretreatment box 2 through the air outlet pipe 24. Subsequently, the water pump 21 is started to operate, and the waste liquid in the pretreatment box 2 is extracted into the distillation tower body 22 through the liquid outlet pipe 20 and the connecting pipe for distillation treatment.

[0032] Reference Figure 4-6As shown, a liquid outlet pipe 20 is fixedly provided on one side of the pretreatment box 2, a water pump 21 is fixedly provided on one side of the liquid outlet pipe 20, a connecting pipe is fixedly provided on the output end of the water pump 21, a distillation tower body 22 is fixedly provided on one end of the connecting pipe, a sealed box door 23 is hingedly provided on one side of the pretreatment box 2, an air outlet pipe 24 is fixedly provided on the top of the pretreatment box 2, and a fixed valve is fixedly provided on one side of the air outlet pipe 24, the air inlet pipe 15, the liquid inlet pipe 19 and the liquid outlet pipe 20. Open the sealed box door 23, and then remove the bolts between the partition 12 and the pretreatment box 2 by external tools, and then pull it upwards. The movable partition 12 drives the partition 12 to move upward inside the fixed groove 11, and then separates the stabilizing groove 13 from the guide plate 10, so that the partition 12 is removed for cleaning, and then the guide plate 10 is pulled upward to drive the card strip 9 at the bottom of the guide plate 10 to separate from the card groove 8, so that the guide plate 10 is removed inside the pretreatment box 2, which is convenient for cleaning or replacement, and then the air guide tube 17 is rotated forward, thereby driving the air guide tube 17 to separate from the rotating shaft 6, and then the air guide tube 17 is removed for cleaning or replacement, which is convenient for later maintenance and greatly extends the service life of the device.

[0033] Working principle of this utility model:

[0034] The utility model is a feed pretreatment device for a methyl acetate distillation tower. When the device is in use, the pretreatment box 2 is first placed on the top of the workbench 1 for clamping, and then bolts are fixed between the fixing plate 3 and the pretreatment box 2 by external tools to enhance stability. Then, the waste liquid is opened by opening the fixed valve on one side of the liquid inlet pipe 19, so that the waste liquid enters the interior of the pretreatment box 2 through the liquid inlet pipe 19. Then, the fixed valve on the side of the air inlet pipe 15 is opened, so that the waste gas enters the interior of the fixed cylinder 16 through the air inlet pipe 15, and is transported to the interior of the air guide pipe 17 through the fixed cylinder 16. Then, the waste gas is discharged through a plurality of exhaust holes 18 opened on the surface of the air guide pipe 17, so that the waste gas enters the interior of the pretreatment box 2 and is preliminarily mixed with the waste liquid.

[0035] Then, the motor 5 is started to drive the rotating shaft 6 to rotate in the forward direction, and the rotating shaft 6 drives the multiple stirring blades 7 to rotate. The surface of the stirring blades 7 is set to an inclined shape, thereby driving the waste liquid and the waste gas to stir, and driving the waste liquid and the waste gas to rotate and move toward the side close to the guide plate 10. Then, while contacting the guide plate 10, the multiple guide plates 10 form a guide route, so that the waste liquid and the waste gas are fully in contact, driving the methyl acetate in the waste gas to dissolve into the waste liquid, increasing the concentration of methyl acetate in the waste liquid, and achieving full mixing of the gas and liquid;

[0036] The treated waste gas then floats upward through the air vents 14 on the partition 12 and enters the top of the pretreatment tank 2. The fixed valve on one side of the outlet pipe 24 is then opened to allow the treated waste gas to be discharged from the pretreatment tank 2 through the outlet pipe 24. The water pump 21 is then started to pump the waste liquid in the pretreatment tank 2 through the liquid outlet pipe 20 and the connecting pipe into the distillation tower body 22 for distillation treatment.

[0037] When the parts inside the pretreatment box 2 need to be checked and repaired after long-term use, first empty the waste gas and waste liquid inside the pretreatment box 2, then open the sealed box door 23, and then use external tools to remove the bolts between the partition 12 and the pretreatment box 2, and then pull the partition 12 upward to drive the partition 12 to move upward inside the fixed groove 11, and then separate its stabilizing groove 13 from the guide plate 10, so that the partition 12 can be removed for cleaning, and then pull the guide plate 10 upward to drive the card strip 9 at the bottom of the guide plate 10 to separate from the card slot 8, so that the guide plate 10 can be removed from the inside of the pretreatment box 2, which is convenient for cleaning or replacement, and then rotate the air guide tube 17 forward, so as to drive the air guide tube 17 to separate from the rotating shaft 6, and then remove the air guide tube 17 for cleaning or replacement, which is convenient for later maintenance and greatly extends the service life of the device.

[0038] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A feed pretreatment device for a methyl acetate distillation column, comprising a workbench (1), characterized in that: A pretreatment box (2) is clamped on the top of the workbench (1), and fixed plates (3) are fixedly provided on both sides of the pretreatment box (2). The fixed plates (3) are connected to the workbench (1) by bolts, and a stirring mechanism is provided inside the pretreatment box (2); The stirring mechanism comprises a support plate (4) fixedly arranged on one side of the pretreatment box (2); a motor (5) is fixedly arranged on the top of the support plate (4); a rotating shaft (6) is fixedly arranged on the output end of the motor (5); a plurality of stirring blades (7) are fixedly arranged on the surface of the rotating shaft (6); the surfaces of the plurality of stirring blades (7) are all arranged in an inclined shape; a plurality of slots (8) are opened on the inner wall of the pretreatment box (2); a plurality of slots (8) are clamped inside the plurality of slots (8); a guide plate (10) is fixedly arranged on the top of the guide plate (9); and the surface of the guide plate (10) is arranged in an arc shape.

2. The feed pretreatment device for a methyl acetate distillation column according to claim 1, wherein: Two fixing grooves (11) are provided inside the pretreatment box (2), and a partition (12) is slidably connected inside the two fixing grooves (11). A plurality of stabilizing grooves (13) are provided at the bottom of the partition (12), and the plurality of stabilizing grooves (13) are all engaged with the guide plate (10).

3. The feed pretreatment device for the methyl acetate distillation column according to claim 2, wherein: The surface of the partition (12) is provided with a plurality of air holes (14), and the partition (12) and the pretreatment box (2) are connected by bolts.

4. The feed pretreatment device for a methyl acetate distillation column according to claim 1, wherein: A processing mechanism is fixedly arranged inside the pretreatment box (2), and the processing mechanism includes an air inlet pipe (15) that is arranged through one side of the pretreatment box (2), and a plurality of fixed cylinders (16) are fixedly arranged at the bottom of the air inlet pipe (15). The interiors of the plurality of fixed cylinders (16) are all threadedly connected to an air guide pipe (17), and a plurality of exhaust holes (18) are opened on the surface of the air guide pipe (17).

5. The feed pretreatment device for a methyl acetate distillation column according to claim 1, wherein: A liquid inlet pipe (19) is provided through one side of the pretreatment box (2), and the liquid inlet pipe (19) is provided at the bottom of the air inlet pipe (15).

6. The feed pretreatment device for a methyl acetate distillation column according to claim 1, wherein: A liquid outlet pipe (20) is fixedly provided on one side of the pretreatment tank (2), a water pump (21) is fixedly provided on one side of the liquid outlet pipe (20), a connecting pipe is fixedly provided at the output end of the water pump (21), and a distillation tower body (22) is fixedly provided at one end of the connecting pipe.

7. The feed pretreatment device for a methyl acetate distillation column according to claim 1, wherein: A sealed box door (23) is hingedly provided on one side of the pretreatment box (2), an air outlet pipe (24) is fixedly provided on the top of the pretreatment box (2), and fixed valves are fixedly provided on one side of the air outlet pipe (24), the air inlet pipe (15), the liquid inlet pipe (19), and the liquid outlet pipe (20).

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