A vacuum distillation apparatus suitable for the concentration of natural mixed tocopherols

Abstract

The application relates to the technical field of natural mixed tocopherol processing, and discloses a vacuum distillation device suitable for natural mixed tocopherol concentration, which comprises a rack, a vacuum distillation mechanism is arranged on the top of the rack, a stirring mechanism is arranged in the vacuum distillation mechanism, supporting mechanisms are arranged on the front and back sides of the vacuum distillation mechanism, the vacuum distillation mechanism comprises a distillation tank, the distillation tank is fixedly connected to the left side of the top of the rack, a sealing cover is slidably connected to the top of the distillation tank, a first electric valve is fixedly connected to the bottom of the distillation tank, a thermocouple is fixedly connected to the right side of the top of the sealing cover, when in use, the vacuum distillation mechanism is provided with a vacuum pump, an air suction pipe and an air exhaust pipe to form a vacuum pressure reduction system, the inside of the distillation tank can be vacuumized, the air pressure in the distillation tank is effectively reduced, the boiling point of the natural mixed tocopherol material is greatly reduced, and low-temperature distillation concentration operation is realized.

Description

Technical Field

[0001] This invention relates to the field of natural mixed tocopherol processing technology, specifically a vacuum distillation apparatus suitable for the concentration of natural mixed tocopherols. Background Technology

[0002] Natural mixed tocopherols are a class of substances with excellent antioxidant, nutritional and health care and physiological activities. They are widely used in many fields such as food processing, health products, cosmetics, and medicine. Natural mixed tocopherols are mostly extracted from natural raw materials such as deodorized distillates of vegetable oils and oilseed cakes. The crude extract usually contains water, low-boiling-point solvents, light components of oils and various impurities, and the content of effective ingredients is low. It must be concentrated and purified to meet the production and use standards of downstream products. Tocopherol is a heat-sensitive substance. It is extremely easy to oxidize, decompose, and deactivate its active ingredients under high temperature conditions, which will directly reduce the product quality, biological activity, and use value. Therefore, its concentration and purification process has strict requirements on temperature, environmental pressure, and operating conditions. At present, the mainstream method for the concentration of natural mixed tocopherol in the industry is still the traditional atmospheric distillation equipment or simple vacuum distillation device. Traditional atmospheric distillation relies on heating and vaporization under atmospheric pressure to separate components. The materials have high boiling points, and the entire operation requires maintaining a high temperature. Prolonged high-temperature heating will severely damage the molecular structure of natural mixed tocopherols, causing a large loss of effective active ingredients. At the same time, it is easy to cause oxidation and deterioration of materials, which not only greatly reduces the purity and quality of the concentrated product, but also increases the product scrap rate and production costs. Most existing distillation equipment adopts static distillation mode. The crude extracted natural mixed tocopherol material has a high viscosity. When it is placed inside the distillation vessel, uneven heating of the surface and bottom layers of the material will occur, and local dead zones of heating will be formed. Therefore, it is necessary to design a vacuum distillation apparatus suitable for the concentration of natural mixed tocopherols to solve the above problems. Summary of the Invention

[0003] The purpose of this invention is to provide a vacuum distillation apparatus suitable for the concentration of natural mixed tocopherols, in order to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a vacuum distillation apparatus suitable for the concentration of natural mixed tocopherols, comprising a frame, a vacuum distillation mechanism disposed on the top of the frame, a stirring mechanism disposed inside the vacuum distillation mechanism, and support mechanisms disposed on the front and rear sides of the vacuum distillation mechanism; The vacuum distillation mechanism includes a distillation tank, which is fixedly connected to the top left side of the frame. A sealing cover is slidably connected to the top of the distillation tank. A first electric valve is fixedly connected to the bottom of the distillation tank. A thermocouple is fixedly connected to the top right side of the sealing cover. A vacuum gauge is fixedly connected to the top front side of the sealing cover. A feeding pipe is fixedly connected to the top left side of the sealing cover. A protective cover is threaded onto the left end of the feeding pipe. A heating tube is fixedly connected inside the distillation tank. A conveying pipe is fixedly connected to the top right side of the distillation tank. A condenser is fixedly connected to the bottom right side of the conveying pipe. A storage tank is fixedly connected to the bottom of the condenser. A second electric valve is fixedly connected to the bottom of the storage tank. A cooling coil is fixedly connected inside the condenser. An air suction pipe is fixedly connected to the top of the condenser. A vacuum pump is fixedly connected to the rear side of the air suction pipe. An exhaust pipe is fixedly connected to the right side of the front surface of the vacuum pump.

[0005] Preferably, the sealing cap is internally threaded with a fixing pin, which passes through the interior of the distillation chamber. The interior of the distillation chamber has a heating chamber, and the heating tube is fixedly connected to the heating chamber. The left side of the distillation chamber has a circular wiring groove that communicates with the heating chamber, facilitating heating of the interior of the distillation chamber through the heating tube.

[0006] Preferably, the first electric valve extends through the inside of the frame, the condenser is fixedly connected to the top right side of the frame, and the storage tank and the second electric valve extend through the inside of the frame, so as to facilitate the discharge of impurities remaining at the bottom of the distillation tank through the first electric valve.

[0007] Preferably, the cooling coil is fixedly connected to the outer periphery of both ends, and the fixed frame is fixedly connected to the inside of the condenser box. The vacuum pump is fixedly connected to the bottom of the support frame, and the support frame is fixedly connected to the right side of the top of the frame, so as to ensure the stability of the cooling coil through the fixed frame.

[0008] Preferably, the right rear end of the cooling coil is the return end, and the left front end is the inlet end, which facilitates the circulation of coolant through the inlet and return ends.

[0009] Preferably, the stirring mechanism includes a stepper motor, which is fixedly connected to the top of the sealing cover. A rotating rod is fixedly connected to the bottom of the stepper motor, which is rotatably connected to the inside of the sealing cover. A stirring shaft is fixedly connected to the periphery of the rotating rod, and a scraper is fixedly connected to the periphery of the bottom end of the rotating rod.

[0010] Preferably, the stirring shaft is rotatably connected to the inside of the distillation tank, and the scraper is slidably connected to the bottom of the distillation tank, so as to facilitate cleaning of the bottom of the distillation tank by scraping.

[0011] Preferably, the support mechanism includes a first support frame, which is fixedly connected to the front and rear sides of the distillation tank. A connecting arm is fixedly connected to the right side of the first support frame, and a second support frame is fixedly connected to the right side of the connecting arm. The second support frame is fixedly connected to the front and rear sides of the condenser.

[0012] Preferably, the first support frame and the second support frame are fixedly connected to the top of the frame, so as to further ensure the stability of the distillation tank and the condenser tank through the first support frame and the second support frame.

[0013] Compared with the prior art, the present invention provides a vacuum distillation apparatus suitable for the concentration of natural mixed tocopherols, which has the following beneficial effects: This vacuum distillation apparatus, suitable for concentrating natural mixed tocopherols, utilizes a vacuum distillation mechanism comprised of a vacuum pump, suction pipe, and exhaust pipe to create a vacuum inside the distillation chamber. This effectively reduces the pressure within the chamber, significantly lowering the boiling point of the natural mixed tocopherols and enabling low-temperature distillation concentration. The entire process operates in a low-temperature, negative-pressure environment, preventing the destruction of the active ingredients in tocopherols by high temperatures. This maximizes the preservation of the bioactivity and original quality of the natural mixed tocopherols, eliminates the problem of material oxidation and decomposition, and improves the purity and yield of the final product. A thermocouple and vacuum gauge are integrated into the top of the sealed lid for real-time and accurate monitoring of the temperature and vacuum inside the distillation chamber. Pressure parameters allow staff to adjust equipment operating parameters in real time according to the requirements of the tocopherol concentration process, enabling refined and standardized distillation operations. This effectively avoids problems such as insufficient concentration and material deterioration caused by abnormal pressure and temperature, significantly improving process controllability and production stability. The distillation tank and condenser are connected by a conveying pipe, forming a highly efficient condensation system with the cooling coil inside the condenser. Light component impurities and volatile solvents separated by distillation can quickly enter the condenser through the conveying pipe. The circulating coolant in the cooling coil can quickly cool and condense the high-temperature gaseous material, causing the gaseous medium to liquefy rapidly. The condensation effect is good and fast, effectively avoiding material loss and air pollution caused by the escape of gaseous materials.

[0014] This vacuum distillation apparatus, suitable for concentrating natural mixed tocopherols, addresses the challenges of traditional vacuum distillation equipment, which often employs a static distillation mode where the natural mixed tocopherols remain stationary within the distillation tank. This results in uneven heating between the surface and bottom layers, localized overheating, and inconsistent evaporation rates, leading to time-consuming and inefficient distillation processes. Furthermore, it addresses the issue of incomplete concentration and overheating / deterioration of some materials. This apparatus uses a stepper motor to drive a rotating rod and stirring shaft at a uniform speed, providing comprehensive agitation and continuous flow of the tocopherols within the distillation tank. This ensures uniform heating, eliminating localized temperature differences and heating dead zones. Simultaneously, a scraper at the bottom of the rotating rod slides along the bottom of the distillation tank, effectively removing viscous tocopherols adhering to the bottom. This prevents the high-viscosity natural mixed tocopherols from adhering, accumulating, and charring, thus eliminating material waste and ensuring uniform heat transfer. It further accelerates the evaporation and separation of lighter impurities, significantly improving the concentration efficiency of vacuum distillation. Additionally, it assists in cleaning impurities from the bottom of the distillation tank.

[0015] This vacuum distillation apparatus, suitable for the concentration of natural mixed tocopherols, utilizes a support mechanism. A first support frame, connecting arm, and second support frame form an integrated support system, respectively fixing and limiting the distillation tank and condenser. Both sets of support frames are fixed to the top of the frame, forming an integral load-bearing structure. This effectively disperses the vibration stress generated during equipment operation, significantly reducing the impact of vibrations from stirring and vacuum pump operation on the overall structure of the equipment. It avoids problems such as loose pipe connections, sealing failure, and equipment misalignment, continuously ensuring the sealed negative pressure environment of the distillation tank and the stability of equipment operation. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort: Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the structure of the present invention from a bottom view; Figure 3 This is a schematic diagram of a vacuum distillation mechanism; Figure 4 This is a cross-sectional view of the distillation tank. Figure 5 This is a schematic diagram of the structure on the right side of the distillation tank; Figure 6 This is a schematic diagram of the cross-sectional structure of the condenser box; Figure 7 This is a schematic diagram of the stirring mechanism. Figure 8 This is a schematic diagram of the supporting structure.

[0017] In the diagram: 1. Frame; 2. Vacuum distillation mechanism; 3. Stirring mechanism; 4. Support mechanism; 21. Distillation tank; 22. Sealing cap; 23. Fixing pin; 24. First electric valve; 25. Delivery pipe; 26. Condenser; 27. Thermocouple; 28. Feeding pipe; 29. ​​Protective cover; 291. Vacuum gauge; 292. Heating tube; 293. Storage tank; 294. Second electric valve; 295. Cooling coil; 296. Suction pipe; 297. Vacuum pump; 298. Exhaust pipe; 299. Support frame; 2991. Fixing frame; 31. Stepper motor; 32. Rotating rod; 33. Stirring shaft; 34. Scraper; 41. First support frame; 42. Connecting arm; 43. Second support frame. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances. Example

[0020] Please see Figure 1-8 The present invention provides a technical solution: a vacuum distillation apparatus suitable for the concentration of natural mixed tocopherols, comprising a frame 1, a vacuum distillation mechanism 2 provided on the top of the frame 1, a stirring mechanism 3 provided inside the vacuum distillation mechanism 2, and support mechanisms 4 provided on the front and rear sides of the vacuum distillation mechanism 2. The vacuum distillation mechanism 2 includes a distillation tank 21, which is fixedly connected to the top left side of the frame 1. A sealing cover 22 is slidably connected to the top of the distillation tank 21. A first electric valve 24 is fixedly connected to the bottom of the distillation tank 21. A thermocouple 27 is fixedly connected to the top right side of the sealing cover 22. A vacuum gauge 291 is fixedly connected to the top front side of the sealing cover 22. A feeding pipe 28 is fixedly connected to the top left side of the sealing cover 22. A protective cover 29 is threadedly connected to the left end of the feeding pipe 28. A heating tube is fixedly connected inside the distillation tank 21. 292. A conveying pipe 25 is fixedly connected to the top right side of the distillation tank 21. A condenser 26 is fixedly connected to the bottom right side of the conveying pipe 25. A storage tank 293 is fixedly connected to the bottom of the condenser 26. A second electric valve 294 is fixedly connected to the bottom of the storage tank 293. A cooling coil 295 is fixedly connected inside the condenser 26. A suction pipe 296 is fixedly connected to the top of the condenser 26. A vacuum pump 297 is fixedly connected to the rear side of the suction pipe 296. An exhaust pipe 298 is fixedly connected to the right side of the front surface of the vacuum pump 297.

[0021] The sealing cap 22 is internally threaded with a fixing pin 23, which passes through the interior of the distillation tank 21. The interior of the distillation tank 21 has a heating chamber, and the heating tube 292 is fixedly connected to the heating chamber. The left side of the distillation tank 21 has a circular wiring groove that communicates with the heating chamber, so as to facilitate heating the interior of the distillation tank 21 through the heating tube 292.

[0022] The first electric valve 24 passes through the inside of the frame 1, the condenser 26 is fixedly connected to the top right side of the frame 1, and the storage tank 293 and the second electric valve 294 pass through the inside of the frame 1, so that the impurities remaining at the bottom of the distillation tank 21 can be discharged through the first electric valve 24.

[0023] The cooling coil 295 is fixedly connected to the outer periphery of both ends of the cooling coil 295 by a fixing bracket 2991. The fixing bracket 2991 is fixedly connected to the inner side of the condenser box 26. The vacuum pump 297 is fixedly connected to the bottom of a load-bearing frame 299. The load-bearing frame 299 is fixedly connected to the top right side of the frame 1, so that the cooling coil 295 can be stabilized by the fixing bracket 2991.

[0024] The right rear end of the cooling coil 295 is the return end, and the left front end is the inlet end, which facilitates the circulation of coolant through the inlet and return ends. Example

[0025] Please see Figure 1-8 Furthermore, based on Embodiment 1, the stirring mechanism 3 further includes a stepper motor 31, which is fixedly connected to the top of the sealing cover 22. A rotating rod 32 is fixedly connected to the bottom of the stepper motor 31. The rotating rod 32 is rotatably connected to the inside of the sealing cover 22. A stirring shaft 33 is fixedly connected to the periphery of the rotating rod 32. A scraper 34 is fixedly connected to the periphery of the bottom end of the rotating rod 32.

[0026] The stirring shaft 33 is rotatably connected to the inside of the distillation tank 21, and the scraper 34 is slidably connected to the bottom of the distillation tank 21, so as to facilitate cleaning of the bottom of the distillation tank 21 by scraping the scraper 34. Example

[0027] Please see Figure 1-8 Furthermore, based on Examples 1 and 2, the support mechanism 4 includes a first support frame 41, which is fixedly connected to the front and rear sides of the distillation tank 21. A connecting arm 42 is fixedly connected to the right side of the first support frame 41, and a second support frame 43 is fixedly connected to the right side of the connecting arm 42. The second support frame 43 is fixedly connected to the front and rear sides of the condensation tank 26.

[0028] The first support frame 41 and the second support frame 43 are fixedly connected to the top of the frame 1, so that the stability of the distillation tank 21 and the condenser tank 26 can be further ensured by the first support frame 41 and the second support frame 43.

[0029] In actual operation, when this device is used, before the equipment is officially put into operation, the staff first checks the connection and sealing of each structure of the device, confirms that the first electric valve 24 and the second electric valve 294 are in the closed state, ensures that the entire pipeline is sealed, and supplies power to the heating tube 292 through the external power supply equipment connection line through the wiring groove to enable it to work normally. The external coolant delivery pipe 25 is connected to the inlet end of the cooling coil 295, and the coolant recovery pipe is connected to the return end to realize the circulation of coolant. Then, unscrew the protective cap 29 at the left end of the feeding pipe 28, and add the natural mixed tocopherol raw material to be concentrated into the distillation tank 21 through the feeding pipe 28. After the feeding is completed, tighten the protective cap 29 again to achieve a complete seal at the feeding port. The sealing cap 22 is locked to the distillation tank 21 by the fixing pin 23, which can achieve a high-strength seal and prevent air leakage, pressure loss and material oxidation during subsequent negative pressure operations, thus creating a closed operating chamber for vacuum distillation. After pretreatment, vacuum pump 297 is started. Vacuum pump 297 performs vacuuming operation on the closed cavity composed of distillation tank 21, delivery pipe 25 and condensation tank 26 through suction pipe 296. Air in the cavity is discharged through exhaust pipe 298, gradually reducing the internal air pressure of the entire closed system. The staff can observe the internal vacuum degree in real time through vacuum gauge 291 on top of sealing cover 22. According to the concentration process requirements of natural mixed tocopherols, the negative pressure of the cavity is stably set within the process standard range. Utilizing the physical principle that the boiling point of liquid decreases with the decrease of ambient air pressure, the boiling vaporization temperature of natural mixed tocopherols is greatly reduced, avoiding the oxidation, decomposition and deactivation of tocopherol effective components caused by traditional atmospheric distillation at high temperature, thus ensuring product quality from the working environment. Once the vacuum level inside the chamber reaches the set standard, the heating tube 292 is embedded inside the heating chamber of the distillation box 21, which can heat the material inside the box evenly from all directions. The staff monitors the temperature of the material inside the distillation box 21 in real time through the thermocouple 27, and precisely controls the heating power to maintain a low-temperature constant-temperature distillation state. Under the negative pressure and low-temperature environment, the low-boiling-point solvent, water and light impurities in the natural mixed tocopherol raw material are heated and vaporized first to form a gaseous mixed medium. The high-purity natural mixed tocopherol has a higher boiling point and remains in a liquid state under the negative pressure and temperature conditions, thereby achieving the separation of effective components and impurities, and completing the core process of tocopherol concentration. Throughout the heating and distillation process, the stepper motor 31 on the top of the sealing cover 22 is started synchronously. The stepper motor 31 drives the rotating rod 32 to rotate at a constant speed, which in turn drives the stirring shaft 33 around the rotating rod 32 to rotate synchronously. This continuously stirs and agitates the liquid tocopherol material at the bottom of the distillation tank 21. In view of the characteristics of natural mixed tocopherol having high viscosity and being easy to deposit and adhere, the stirring shaft 33 can drive the material to flow and turn over as a whole, which solves the problem of uneven heating of the material from top to bottom and large local temperature deviation in static distillation, and keeps the temperature of the material in the whole tank consistent. At the same time, the scraper 34 at the bottom of the rotating rod 32 slides and scrapes against the bottom of the distillation tank 21 to continuously clean the viscous material adhering to the bottom of the tank, avoiding the problem of coking, deterioration and residue caused by long-term accumulation of material under heat. This not only reduces material loss and improves the finished product recovery rate, but also prevents scale buildup at the bottom of the tank from affecting heat transfer efficiency, ensuring the continuous and stable operation of the distillation process. During the distillation process, gaseous light impurities and solvent vapors generated by vaporization are uniformly introduced into the condenser 26 through the delivery pipe 25 on the top right side of the distillation tank 21 under the action of gas pressure difference. The condenser 26 is equipped with a circulating cooling coil 295. Low-temperature coolant flows in from the liquid inlet end on the left front end of the cooling coil 295 and flows out from the liquid return end on the right rear end, forming a continuous circulating refrigeration circuit to rapidly and fully force-cool and condense the high-temperature gaseous medium entering the condenser 26. The high-temperature gaseous medium is rapidly liquefied upon cooling, transforming into liquid impurities and waste solvents. Under the action of gravity, these liquids fall directly into the storage tank 293 at the bottom of the condenser 26 to complete closed-loop collection, effectively avoiding material loss and environmental pollution caused by the escape of the gaseous medium. The storage tank 293 is in a sealed state, which can prevent the liquefied impurities from flowing back to the distillation tank 21 and isolate the outside air. The unliquefied gas is directly discharged into the atmosphere through the exhaust pipe 298 of the vacuum pump 297. After the low-temperature vacuum distillation and impurity condensation separation processes are completed, and the thermocouple 27 detects that the temperature inside the distillation tank 21 has dropped to the specified temperature, the heating tube 292, stepper motor 31 and vacuum pump 297 are turned off. After the temperature and pressure inside the equipment cavity return to normal, the high-purity natural mixed tocopherol concentrate is retained inside the distillation tank 21, completing the overall concentration operation. If there are a small amount of high-temperature coking residue or heavy impurities inside the equipment, the first electric valve 24 can be opened to quickly discharge the residue and waste inside the distillation tank 21 for easy equipment cleaning. Waste solvent and light impurities collected inside storage tank 293 can be discharged in a timed and quantitative manner through the second electric valve 294 at the bottom, realizing centralized treatment of impurities. During the entire operation, the first support frame 41 and connecting arm 42 on the front and rear sides of distillation tank 21 and the second support frame 43 on the front and rear sides of condensation tank 26 form an integrated support system, which effectively counteracts the equipment vibration caused by stirring and vacuuming, and ensures long-term stable operation of the equipment. In use, all the first electric valves 24, thermocouples 27, heating tubes 292, second electric valves 294, vacuum pumps 297 and stepper motors 31 need to be connected to the same PLC controller and connected to their respective drive devices to achieve automated operation and parameter adjustment. The PLC controller is existing technology and its operation method is well known to those skilled in the art, so it will not be described in detail in this case.

[0030] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A vacuum distillation apparatus suitable for concentrating natural mixed tocopherols, comprising a frame (1), characterized in that: The frame (1) is provided with a vacuum distillation mechanism (2) at the top, and a stirring mechanism (3) is provided inside the vacuum distillation mechanism (2). Support mechanisms (4) are provided on the front and rear sides of the vacuum distillation mechanism (2). The vacuum distillation mechanism (2) includes a distillation tank (21), which is fixedly connected to the top left side of the frame (1). A sealing cover (22) is slidably connected to the top of the distillation tank (21). A first electric valve (24) is fixedly connected to the bottom of the distillation tank (21). A thermocouple (27) is fixedly connected to the top right side of the sealing cover (22). A vacuum gauge (291) is fixedly connected to the front side of the top of the sealing cover (22). A feeding pipe (28) is fixedly connected to the top left side of the sealing cover (22). A protective cover (29) is threadedly connected to the left end of the feeding pipe (28). A heating tube (292) is fixedly connected inside the distillation tank (21). A conveying pipe (25) is fixedly connected to the top right side of the distillation tank (21). A condenser box (26) is fixedly connected to the right side of the bottom of the delivery pipe (25). A storage tank (293) is fixedly connected to the bottom of the condenser box (26). A second electric valve (294) is fixedly connected to the bottom of the storage tank (293). A cooling coil (295) is fixedly connected inside the condenser box (26). A suction pipe (296) is fixedly connected to the top of the condenser box (26). A vacuum pump (297) is fixedly connected to the rear side of the suction pipe (296). An exhaust pipe (298) is fixedly connected to the right side of the front surface of the vacuum pump (297).

2. The vacuum distillation apparatus for concentrating natural mixed tocopherols according to claim 1, characterized in that: The sealing cap (22) is internally threaded with a fixing pin (23), which passes through the inside of the distillation tank (21). The distillation tank (21) has a heating chamber inside, and the heating tube (292) is fixedly connected to the heating chamber. The left side of the distillation tank (21) has a wiring groove that is circular and communicates with the heating chamber.

3. The vacuum distillation apparatus for concentrating natural mixed tocopherols according to claim 1, characterized in that: The first electric valve (24) passes through the inside of the frame (1), the condenser (26) is fixedly connected to the top right side of the frame (1), and the storage tank (293) and the second electric valve (294) pass through the inside of the frame (1).

4. A vacuum distillation apparatus for concentrating natural mixed tocopherols according to claim 1, characterized in that: The cooling coil (295) is fixedly connected to the outer periphery of the front and rear ends with a fixed bracket (2991), which is fixedly connected to the inner side of the condenser box (26). The vacuum pump (297) is fixedly connected to the bottom with a load-bearing frame (299), which is fixedly connected to the top right side of the frame (1).

5. A vacuum distillation apparatus for concentrating natural mixed tocopherols according to claim 1, characterized in that: The right rear end of the cooling coil (295) is the liquid return end, and the left front end is the liquid inlet end.

6. A vacuum distillation apparatus for concentrating natural mixed tocopherols according to claim 1, characterized in that: The stirring mechanism (3) includes a stepper motor (31), which is fixedly connected to the top of the sealing cover (22). A rotating rod (32) is fixedly connected to the bottom of the stepper motor (31). The rotating rod (32) is rotatably connected to the inside of the sealing cover (22). A stirring shaft (33) is fixedly connected to the periphery of the rotating rod (32). A scraper (34) is fixedly connected to the periphery of the bottom end of the rotating rod (32).

7. A vacuum distillation apparatus for concentrating natural mixed tocopherols according to claim 6, characterized in that: The stirring shaft (33) is rotatably connected to the inside of the distillation tank (21), and the scraper (34) is slidably connected to the bottom of the distillation tank (21).

8. A vacuum distillation apparatus for concentrating natural mixed tocopherols according to claim 1, characterized in that: The support mechanism (4) includes a first support frame (41), which is fixedly connected to the front and rear sides of the distillation tank (21). A connecting arm (42) is fixedly connected to the right side of the first support frame (41), and a second support frame (43) is fixedly connected to the right side of the connecting arm (42). The second support frame (43) is fixedly connected to the front and rear sides of the condenser (26).

9. A vacuum distillation apparatus for concentrating natural mixed tocopherols according to claim 8, characterized in that: The first support frame (41) and the second support frame (43) are respectively fixedly connected to the top of the frame (1).

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