A short-path distillation purification method for plasticizer production

Abstract

The present invention relates to the technical field of short-path distillation, and in particular to a short-path distillation purification method for plasticizer production. The present invention comprises a distillation tower, which comprises a tower cap, a cylinder and a bottom cover which are detachably and sealedly fixedly connected in sequence from top to bottom. The distillation tower is also provided with a drive assembly and a distillation assembly which cooperate with each other. The drive assembly comprises a power unit and an operating unit. The power unit comprises a first magnetic transmission wheel, a second magnetic transmission wheel and a ferromagnetic rod. The operating unit comprises a rotating shaft, a connecting frame and spiral blades. The distillation assembly comprises a semiconductor refrigeration plate, a sleeve, an annular grid plate, a condensation rod, a condenser, a liquid storage tank and a liquid supply pump. The tower cap is provided with a feed pipe which cooperates with a liquid guide ring, the tower cap is also provided with a negative pressure pipe, the bottom cover is provided with a heavy component discharge pipe, and the sleeve is provided with a light component discharge pipe. The present invention can effectively solve the problems of high energy consumption and poor production quality in the prior art.

Description

Technical Field

[0001] The invention relates to the technical field of short-path distillation, and in particular to a short-path distillation purification method for plasticizer production. Background Art

[0002] At present, plasticizers are the largest type of additives in the modern plastics industry. They play a decisive role in promoting the development of the plastics industry, especially the polyvinyl chloride (PVC) industry. They are also widely used in synthetic rubber, coatings, adhesives, sealing materials and other fields. Short-path distillation, as a high-efficiency distillation separation technology, has been widely used in scientific research and production fields, especially in the separation of high-boiling point and heat-sensitive substances, such as plasticizers. However, in the prior art, a small short-path distillation device is disclosed in the patent document with application number: CN201821518380.8, including a liquid storage tank, a recovery support seat arranged above the liquid storage tank, a condensation barrel arranged above the recovery support seat, a top cover arranged above the condensation barrel, a driving motor arranged at the center position of the top cover, a rotating frame connected to the rotating shaft of the driving motor, a scraper arranged on the rotating frame, an evaporation liquid outlet structure located below the rotating frame, a collection tank arranged around the lower end of the inner wall of the condensation barrel, and an external discharge pipe that passes through the condensation barrel and is connected to the collection tank; a liquid inlet is provided at the upper end of the side wall of the liquid storage tank, a liquid discharge port is provided at the lower end of the side wall of the liquid storage tank, and the liquid inlet is connected to a vacuum pump through a pipeline. The present invention provides a small short-path distillation device with a simple structure, convenient use, and greater mobility, which greatly improves the scope of application and ease of use of the product and better meets market demand.

[0003] However, there are still the following deficiencies in its actual application:

[0004] First, the energy consumption is high because it requires separate heating and cooling systems, which inevitably increases its energy consumption, and its heating mechanism has poor ability to maintain temperature (that is, there is a large error between the actual temperature and the set temperature, and its heating mechanism cannot respond to rapid changes in temperature in a timely manner).

[0005] Second, the production quality is poor. Since the rotating frame and the top cover adopt a dynamic sealing design, this design inevitably has the defect of low sealing degree. At the same time, the loose sealing also allows external impurities to enter the solution and cause contamination. Both problems will have an adverse effect on the quality of distillation. Summary of the Invention

[0006] The purpose of the present invention is to solve the shortcomings of the prior art and to address the problems raised in the above background technology.

[0007] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solution: a short-path distillation purification device for plasticizer production, comprising a distillation tower, wherein the distillation tower includes a tower cap, a cylinder and a bottom cover which are detachably sealed and fixedly connected from top to bottom, and the distillation tower is also provided with a drive assembly and a distillation assembly which cooperate with each other.

[0008] Furthermore, the driving assembly includes a power unit and an operating unit;

[0009] The power unit includes a first magnetic transmission wheel, a second magnetic transmission wheel and a ferromagnetic rod. The first magnetic transmission wheel and the second magnetic transmission wheel are respectively coaxially connected to the outer side and the inner side of the middle part of the tower cap. The middle part of the tower cap is also sealed and fixedly connected with a group of ferromagnetic rods in an evenly spaced circular array. The first magnetic transmission wheel and the second magnetic transmission wheel are each distributed with a group of permanent magnets in an evenly spaced circular array with interlaced polarities, and the magnetic axes of the permanent magnets are parallel to the central axis of the tower cap.

[0010] The operating unit includes a rotating shaft, a connecting frame and a spiral blade. The rotating shaft is coaxially fixed to the lower end of the second magnetic transmission wheel. The lower end of the rotating shaft is provided with a radial connecting frame. The end of the connecting frame is installed with a spiral blade coaxial with the rotating shaft. The outer periphery of the spiral blade contacts the inner side wall of the cylinder.

[0011] Furthermore, the tower cap is made of a non-magnetic metal material, and a transmission gear can be provided on the outer side wall of the first magnetic transmission wheel.

[0012] Furthermore, the edge of the upper end of the outer periphery of the spiral blade is in an upwardly convex arc shape.

[0013] Furthermore, the distillation assembly includes a semiconductor refrigeration sheet, a sleeve, an annular grid plate, a condensation rod, a condenser, a liquid storage tank and a liquid supply pump. The outer wall of the cylinder is densely covered with matching semiconductor refrigeration sheets, and the hot ends of the semiconductor refrigeration sheets are in heat-conductive contact with the cylinder. The sleeve is coaxially and sealedly connected to the bottom cover. The sleeve is located at the barrel mouth at one end inside the distillation tower and is provided with a matching annular grid plate. The condensation rod is connected to the annular grid plate, and the lower end of the condensation rod is extended from the bottom of the sleeve. The liquid is transmitted in a sealed manner at the end, and a liquid outlet blind groove coaxial with the middle part of the bottom wall of the lower end of the condensation rod is recessed inwardly, and a group of liquid inlet blind grooves are opened in a circular array at the edge of the bottom wall of the lower end of the condensation rod, and the liquid inlet blind grooves are connected to the liquid outlet blind grooves through corresponding guide grooves, and the notches of the liquid inlet blind grooves are provided with branch pipes, and the branch pipes are connected to the liquid inlet pipe, and the notches of the liquid outlet blind grooves are provided with a liquid outlet pipe, and a liquid supply pump, a liquid storage tank and a condenser are connected in sequence between the input end of the liquid inlet pipe and the output end of the liquid outlet pipe.

[0014] Furthermore, the cylinder is provided with a sealing cover for shielding the semiconductor refrigeration plate, and the sealing cover is provided with an air inlet pipe and a cold air pipe. The input end of the air inlet pipe is connected to an air filter device, and the output end of the cold air pipe is connected in series with the output end of the blower and the condenser in sequence. The input end of the condenser is also provided with a waste heat pipe, and the branch pipes are all provided with a one-way flow valve.

[0015] Furthermore, a liquid guide ring is provided on the inner side wall of the cylinder near its upper end, and a group of liquid leakage grooves inclined toward the inner side wall of the cylinder are symmetrically distributed on the bottom wall of the liquid guide ring. The tower cap is provided with a feed pipe that cooperates with the liquid guide ring, and the tower cap is also provided with a negative pressure pipe. The bottom cover is provided with a heavy component discharge pipe, and the sleeve is provided with a light component discharge pipe.

[0016] Furthermore, the feed pipe, negative pressure pipe, heavy component discharge pipe and light component discharge pipe are all provided with one-way solenoid valves, and the bottom of the bottom cover is also symmetrically provided with a group of supporting feet.

[0017] The purification method using the above-mentioned short-path distillation purification device for plasticizer production comprises the following steps:

[0018] S1, the user connects the negative pressure tube to the negative pressure pump, and uses the negative pressure pump to evacuate the inside of the distillation tower;

[0019] S2, the user drives the first magnetic transmission wheel to rotate through the external drive motor and the transmission gear, thereby driving the second magnetic transmission wheel to rotate, and then driving the spiral blade to scrape the inner wall of the cylinder;

[0020] S3, the user instructs the external controller to start the semiconductor refrigeration chip, the blower and the liquid supply pump, so that the heat released by the hot end of the semiconductor refrigeration chip heats the inner wall of the cylinder, and the cold released by the cold end of the semiconductor refrigeration chip cools the liquid passing through the condenser, and the cooled liquid is used to cool the surface of the cooling rod;

[0021] S4, the user injects the solution to be distilled into the distillation tower through the feed pipe for distillation.

[0022] Furthermore, in said S2, the rotation direction of the spiral blade is spirally upward;

[0023] In the step S4 , the solution to be distilled is firstly injected into the liquid guide ring from the feed pipe, and then flows out evenly through the leakage groove on the bottom wall of the liquid guide ring and flows evenly downward along the inner wall of the cylinder.

[0024] Compared with the prior art, the advantages and positive effects of the present invention are:

[0025] 1. The present invention sets a distillation assembly on a distillation tower, which includes a semiconductor refrigeration sheet, a sleeve, an annular grid plate, a condensation rod, a condenser, a liquid storage tank and a liquid supply pump. The outer wall of the cylinder is densely covered with semiconductor refrigeration sheets that match it, and the semiconductor refrigeration sheets are all in heat-conducting contact with the cylinder at their hot ends. The sleeve is coaxially and sealedly connected to the bottom cover. The sleeve is located at the barrel mouth at one end of the distillation tower and is provided with an annular grid plate that matches it. The condensation rod is connected to the annular grid plate, and the lower end of the condensation rod is sealedly transmitted from the lower end of the sleeve. The middle part of the bottom wall of the lower end of the condensation rod is recessed inwardly to open a coaxial liquid outlet blind groove. The edge of the bottom wall of the lower end of the condensation rod is A group of liquid inlet blind grooves are opened in a circular array along the liquid outlet blind grooves, which are connected to the liquid inlet blind grooves through corresponding guide grooves. Branch pipes are provided at the groove openings of the liquid inlet blind grooves, and the branch pipes are connected to the liquid inlet pipe. A liquid outlet pipe is provided at the groove opening of the liquid outlet blind groove. A liquid supply pump, a liquid storage tank and a condenser are connected in sequence between the input end of the liquid inlet pipe and the output end of the liquid outlet pipe. A sealing cover for shielding the semiconductor refrigeration plate is provided on the cylinder body, and an air inlet pipe and a cold air pipe are provided on the sealing cover. The input end of the air inlet pipe is connected to an air filter device, and the output end of the cold air pipe is connected in series with the output end of the blower and the condenser. The input end of the condenser is also provided with a waste heat pipe, and the branch pipes are all provided with a one-way flow valve design.

[0026] In this way, the heat released by the hot end of the semiconductor refrigeration chip can be used to heat the solution on the inner wall of the cylinder, while the cold energy released by the cold end of the semiconductor refrigeration chip can be used to cool the condensation rod. This can achieve the effect of lowering energy consumption in the actual application of the product of the present invention.

[0027] 2. The present invention incorporates a drive assembly on the distillation column. The drive assembly comprises a power unit and an operating unit. The power unit includes a first magnetic drive wheel, a second magnetic drive wheel, and a ferromagnetic rod, while the operating unit comprises a rotating shaft, a connecting frame, and spiral blades. This design, which utilizes magnetic drive to replace the original dynamic seal structure with a static seal, provides improved sealing performance for the distillation column. This results in improved production quality in practical applications of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is an intuitive diagram of the present invention from the first viewing angle.

[0029] Figure 2 This is an intuitive diagram of the distillation tower after removing the sealing cover from the second perspective of the present invention.

[0030] Figure 3 This is an intuitive diagram of the tower cap from the third viewing angle of the present invention.

[0031] Figure 4 This is an intuitive diagram of the cylinder after partial cross-section under the fourth viewing angle of the present invention.

[0032] Figure 5 Schematic diagram of the installation relationship between the sleeve and the condensation rod under the fifth viewing angle of the present invention.

[0033] Figure 6 This is an intuitive picture of the condensation rod under the sixth viewing angle of the present invention.

[0034] Figure 7 This is an intuitive diagram of the condensation rod after partial cross-section at the seventh viewing angle of the present invention.

[0035] Figure 8 for Figure 1 Magnified view of area A in center.

[0036] Figure 9 for Figure 2 Magnified view of area B.

[0037] The numbers in the figure represent: 1-distillation tower; 2-tower cap; 3-cylinder; 4-bottom cover; 5-first magnetic transmission wheel; 6-second magnetic transmission wheel; 7-ferromagnetic rod; 8-permanent magnet; 9-rotating shaft; 10-connecting frame; 11-spiral blade; 12-transmission gear; 13-semiconductor cooling plate; 14-sleeve; 15-annular grid; 16-condensing rod; 17-condenser; 18-liquid storage tank; 19-liquid supply pump; 20-liquid outlet blind trough ;21-liquid inlet blind groove;22-guide groove;23-branch pipe;24-liquid inlet pipe;25-liquid outlet pipe;26-sealing cover;27-air inlet pipe;28-cold air pipe;29-air filter device;30-blower;31-waste heat pipe;32-flow valve;33-liquid guide ring;34-leakage groove;35-feeding pipe;36-negative pressure pipe;37-heavy component discharge pipe;38-light component discharge pipe;39-solenoid valve;40-support foot. DETAILED DESCRIPTION

[0038] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other.

[0039] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0040] A short-path distillation purification device for plasticizer production in this embodiment, referring to Figure 1-9 : It includes a distillation tower 1, which includes a tower cap 2, a cylinder 3 and a bottom cover 4 that are detachably sealed and fixedly connected from top to bottom. The distillation tower 1 is also provided with a drive component and a distillation component that cooperate with each other.

[0041] The driving assembly includes a power unit and an operating unit.

[0042] The power unit includes a first magnetic transmission wheel 5, a second magnetic transmission wheel 6 and a ferromagnetic rod 7. The first magnetic transmission wheel 5 and the second magnetic transmission wheel 6 are coaxially connected to the outer side and the inner side of the middle part of the tower cap 2 respectively. The middle part of the tower cap 2 is also sealed and fixedly connected with a group of ferromagnetic rods 7 in the form of an evenly spaced circular array. A group of permanent magnets 8 are distributed on the first magnetic transmission wheel 5 and the second magnetic transmission wheel 6 in an evenly spaced circular array with interlaced polarities, and the magnetic axes of the permanent magnets 8 are parallel to the central axis of the tower cap 2.

[0043] The tower cap 2 is made of a non-magnetic metal material to prevent the tower cap 2 from shielding and interfering with the magnetic field between the first magnetic transmission wheel 5 and the second magnetic transmission wheel 6 .

[0044] A transmission gear 12 may be further provided on the outer side wall of the first magnetic transmission wheel 5 , so that the user can use an external driving device (such as an electric motor) to cooperate with the transmission gear to drive the power unit to operate.

[0045] The operating unit includes a rotating shaft 9, a connecting frame 10 and a spiral blade 11. The rotating shaft 9 is coaxially fixed to the lower end of the second magnetic transmission wheel 6. The lower end of the rotating shaft 9 is provided with a radial connecting frame 10. The end of the connecting frame 10 is installed with a spiral blade 11 coaxial with the rotating shaft 9. The outer periphery of the spiral blade 11 contacts the inner wall of the cylinder 3.

[0046] The edge of the upper end of the outer periphery of the spiral blade 11 is in an upwardly convex arc shape, which can prevent the solution from spreading freely on the spiral blade 11.

[0047] The distillation assembly includes a semiconductor refrigeration sheet 13, a sleeve 14, an annular grid plate 15, a condensation rod 16, a condenser 17, a liquid storage tank 18 and a liquid supply pump 19. The outer wall of the cylinder 3 is densely covered with matching semiconductor refrigeration sheets 13, and the semiconductor refrigeration sheets 13 are all in thermally conductive contact with the cylinder 3 at their hot ends. The sleeve 14 is coaxially and sealedly connected to the bottom cover 4. The sleeve 14 is located at the barrel mouth at one end of the distillation tower 1 and is provided with a matching annular grid plate 15. The condensation rod 16 is connected to the annular grid plate, and the lower end of the condensation rod 16 is sealed from the lower end of the sleeve 14. The liquid is transmitted in an inwardly recessed manner in the middle of the bottom wall of the lower end of the condensation rod 16, and a coaxial liquid outlet blind groove 20 is provided. A group of liquid inlet blind grooves 21 are provided in a circular array at the edge of the bottom wall of the lower end of the condensation rod 16. The liquid inlet blind grooves 21 are connected to the liquid outlet blind grooves 20 through corresponding guide grooves 22. Branch pipes 23 are provided at the notches of the liquid inlet blind grooves 21, and the branch pipes 23 are connected to the liquid inlet pipe 24. A liquid outlet pipe 25 is provided at the notch of the liquid outlet blind groove 20, and a liquid supply pump 19, a liquid storage tank and a condenser 17 are connected in sequence between the input end of the liquid inlet pipe 24 and the output end of the liquid outlet pipe 25.

[0048] A sealing cover 26 for shielding the semiconductor refrigeration plate 13 is provided on the cylinder 3, and an air inlet pipe 27 and a cold air pipe 28 are provided on the sealing cover 26. The input end of the air inlet pipe 27 is connected to an air filter device 29 (so that the air can be filtered first, thereby preventing dust and other impurities in the air from adhering to the semiconductor refrigeration plate 13 and affecting its cooling and heating performance). The output end of the cold air pipe 28 is connected in series with the blower 30 and the output end of the condenser 17. The input end of the condenser 17 is also provided with a waste heat pipe 31, and the branch pipe 23 is provided with a one-way flow valve 32.

[0049] A liquid guide ring 33 is provided on the inner side wall of the cylinder 3 near its upper end. A group of liquid leakage grooves 34 inclined toward the inner side wall of the cylinder 3 are symmetrically distributed on the bottom wall of the liquid guide ring 33. A feeding pipe 35 cooperating with the liquid guide ring 33 is provided on the tower cap 2. A negative pressure pipe 36 is also provided on the tower cap 2. A heavy component discharge pipe 37 is provided on the bottom cover 4, and a light component discharge pipe 38 is provided on the sleeve 14.

[0050] It is worth noting that one-way solenoid valves 39 are provided on the feed pipe 35 , the negative pressure pipe 36 , the heavy component discharge pipe 37 and the light component discharge pipe 38 .

[0051] A set of supporting feet 40 are symmetrically provided on the bottom of the bottom cover 4 .

[0052] The purification method using the above-mentioned short-path distillation purification device for plasticizer production comprises the following steps:

[0053] S1, the user connects the negative pressure tube 36 to the negative pressure pump, and uses the negative pressure pump to evacuate the interior of the distillation tower 1.

[0054] In step S2, the user uses an external drive motor in conjunction with the transmission gear 12 to rotate the first magnetic transmission wheel 5, which in turn drives the second magnetic transmission wheel 6, thereby driving the spiral blade 11 to scrape the inner wall of the cylinder 3. It is worth noting that the spiral blade 11 rotates in an upward spiral direction. This not only prolongs the retention time of the solution on the inner wall of the cylinder 3, thereby allowing the solution to be fully distilled and separated, but also effectively enhances the spiral blade 11 to evenly scrape the solution on the inner wall of the cylinder 3.

[0055] S3, the user instructs the semiconductor refrigeration plate 13 to start, the blower 30 to start, and the liquid supply pump 19 to start through the external controller, so that the heat released by the hot end of the semiconductor refrigeration plate 13 heats the inner wall of the cylinder 3, and at the same time, the cold energy released by the cold end of the semiconductor refrigeration plate 13 cools the liquid passing through the condenser 17, and the cooled liquid is used to cool the surface of the cooling rod.

[0056] In step S4, the user injects the solution to be distilled into the distillation column 1 through the feed pipe 35 for distillation. It is noteworthy that the solution to be distilled is first injected into the liquid guide ring 33 through the feed pipe 35, then flows out evenly through the leakage groove 34 on the bottom wall of the liquid guide ring 33 and flows evenly downward along the inner wall of the cylinder 3.

[0057] The above description is merely a preferred embodiment of the present invention and does not constitute any other form of limitation to the present invention. Any person skilled in the art may utilize the technical contents disclosed above to change or modify them into equivalent embodiments with equivalent changes for application in other fields. However, any simple modification, equivalent change, and modification of the above embodiments made in accordance with the technical essence of the present invention without departing from the technical solution of the present invention shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A short-path distillation purification device for plasticizer production, characterized in that: The distillation tower (1) comprises a tower cap (2), a cylinder (3) and a bottom cover (4) which are detachably sealed and fixedly connected in sequence from top to bottom. The distillation tower (1) is also provided with a driving assembly and a distillation assembly which cooperate with each other. The driving assembly includes a power unit and an operating unit; The power unit comprises a first magnetic transmission wheel (5), a second magnetic transmission wheel (6) and a ferromagnetic rod (7), wherein the first magnetic transmission wheel (5) and the second magnetic transmission wheel (6) are respectively coaxially connected to the outer side and the inner side of the middle part of the tower cap (2), and the middle part of the tower cap (2) is also sealed and fixedly connected with a group of ferromagnetic rods (7) in the form of an evenly spaced circular array, and a group of permanent magnets (8) are respectively distributed on the first magnetic transmission wheel (5) and the second magnetic transmission wheel (6) in the form of an evenly spaced circular array with polarities interlaced, and the magnetic axes of the permanent magnets (8) are parallel to the central axis of the tower cap (2); The operating unit comprises a rotating shaft (9), a connecting frame (10) and a spiral blade (11); the rotating shaft (9) is coaxially fixed to the lower end of the second magnetic transmission wheel (6); the lower end of the rotating shaft (9) is provided with a radial connecting frame (10); the end of the connecting frame (10) is provided with a spiral blade (11) coaxial with the rotating shaft (9); the outer periphery of the spiral blade (11) contacts the inner side wall of the cylinder (3); The distillation assembly includes a semiconductor refrigeration sheet (13), a sleeve (14), an annular grid plate (15), a condensation rod (16), a condenser (17), a liquid storage tank (18) and a liquid supply pump (19). The outer wall of the cylinder (3) is densely covered with semiconductor refrigeration sheets (13) that match it, and the hot ends of the semiconductor refrigeration sheets (13) are in thermally conductive contact with the cylinder (3). The sleeve (14) is coaxially and sealedly connected to the bottom cover (4). The sleeve (14) is located at the barrel mouth at one end inside the distillation tower (1) and is provided with an annular grid plate (15) that matches it. The condensation rod (16) is connected to the annular grid plate (15), and the lower end of the condensation rod (16) is tightly connected from the lower end of the sleeve (14). The liquid is passed out in a sealed manner, and a liquid outlet blind groove (20) coaxial with the liquid outlet blind groove (20) is provided in an inwardly recessed manner in the middle of the bottom wall of the lower end of the condensation rod (16), and a group of liquid inlet blind grooves (21) are provided in a circumferential array at the edge of the bottom wall of the lower end of the condensation rod (16), and the liquid inlet blind grooves (21) are respectively connected to the liquid outlet blind groove (20) through corresponding guide grooves (22), and the notches of the liquid inlet blind grooves (21) are provided with branch pipes (23), and the branch pipes (23) are connected to the liquid inlet pipe (24), and the notch of the liquid outlet blind groove (20) is provided with a liquid outlet pipe (25), and a liquid supply pump (19), a liquid storage tank (18) and a condenser (17) are connected in sequence between the input end of the liquid inlet pipe (24) and the output end of the liquid outlet pipe (25); The cylinder (3) is provided with a sealing cover (26) for shielding the semiconductor refrigeration plate (13), and the sealing cover (26) is provided with an air inlet pipe (27) and a cold air pipe (28). The input end of the air inlet pipe (27) is connected to an air filter device (29), and the output end of the cold air pipe (28) is connected in series with the blower (30) and the output end of the condenser (17). The input end of the condenser (17) is also provided with a waste heat pipe (31). The branch pipe (23) is provided with a one-way flow valve (32); The tower cap (2) is made of a non-magnetic metal material, and a transmission gear (12) is further provided on the outer side wall of the first magnetic transmission wheel (5); The edge of the upper end of the outer periphery of the spiral blade (11) is in an upwardly convex arc shape.

2. The short-path distillation purification device for plasticizer production according to claim 1, characterized in that: A liquid guide ring (33) is provided on the inner side wall of the cylinder (3) near the upper end of the cylinder mouth. A group of liquid leakage grooves (34) inclined toward the inner side wall of the cylinder (3) are symmetrically distributed on the bottom wall of the liquid guide ring (33). A feeding pipe (35) cooperating with the liquid guide ring (33) is provided on the tower cap (2). A negative pressure pipe (36) is also provided on the tower cap (2). A heavy component discharge pipe (37) is provided on the bottom cover (4), and a light component discharge pipe (38) is provided on the sleeve (14).

3. The short-path distillation purification device for plasticizer production according to claim 2, characterized in that: The feed pipe (35), the negative pressure pipe (36), the heavy component discharge pipe (37) and the light component discharge pipe (38) are all provided with a one-way electromagnetic valve (39), and the bottom of the bottom cover (4) is also symmetrically provided with a group of supporting feet (40).

4. A purification method using the short-path distillation purification device for plasticizer production according to claim 3, characterized in that: The following steps are involved: S1, the user connects the negative pressure tube (36) to the negative pressure pump, and uses the negative pressure pump to evacuate the interior of the distillation tower (1); S2, the user drives the first magnetic transmission wheel (5) to rotate by cooperating with the transmission gear (12) through the external drive motor, thereby driving the second magnetic transmission wheel (6) to rotate, and then driving the spiral blade (11) to scrape the inner wall of the cylinder (3); S3, the user starts the semiconductor refrigeration plate (13), the air blower (30) and the liquid supply pump (19) through the external controller, thereby heating the inner wall of the cylinder (3) through the heat released by the hot end of the semiconductor refrigeration plate (13), and cooling the liquid passing through the condenser (17) through the cold end of the semiconductor refrigeration plate (13), and the cooled liquid is used to cool the surface of the condensation rod; S4, the user injects the solution to be distilled into the distillation tower (1) through the feed pipe (35) for distillation.

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