Rectification device for improving purity of fusel oil
By designing a vapor-side inlet and a distiller within the fusel oil distillation column, combined with a condenser reflux system, the problem of high 70% alcohol-water content in existing technologies was solved, achieving efficient separation and heat energy recycling, and improving the purity and separation efficiency of fusel oil.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-09
- Publication Date
- 2026-03-13
AI Technical Summary
In existing fusel oil separation processes, the water content of 70 alcohol can easily exceed 30%, resulting in insufficient separation precision and failure to meet product quality standards.
In the fusel oil distillation column, the vapor side inlet is designed above the first theoretical plate, and a distillation unit is used for secondary purification. The 70% alcohol vapor is collected from the vapor side for further separation. Combined with a condenser and reflux system, the efficient separation of 70% alcohol and water is achieved.
It effectively reduces the water content in 70% alcohol, improves its purity and separation efficiency, and enhances the purification efficiency of 95% alcohol, meeting product quality standards and realizing the recycling of thermal energy.
Smart Images
Figure CN121648587A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of chemical technology, and more specifically to a distillation apparatus for improving the purity of fusel oil. Background Technology
[0002] In the industrial production of methanol synthesis and distillation, a certain amount of fusel oil, a byproduct, is generated. Fusel oil is a complex mixture containing multiple components such as methanol, ethanol, propanol, isobutanol, and water. To achieve resource utilization and environmentally friendly treatment, it needs to be separated and purified. The target products are mainly high-purity methanol (also known as 95% methanol, requiring a methanol content ≥ 95%) and other alcohol mixtures (also known as 70% methanol).
[0003] Currently, typical fusel oil distillation processes typically use fusel oil distillation columns to separate and purify fusel oils. For example, the existing NW-type tray column includes a preheater and a fusel oil distillation column. The fusel oil feedstock is preheated in the preheater and then enters the column, which has multiple trays. Heat is provided by a heating device, creating a countercurrent gas-liquid two-phase contact within the column. The light components (mainly methanol) rise to the top of the column, are condensed in a condenser, and a portion is collected as 95% alcohol, while the other portion is pumped back to the top of the column as reflux. The heavy components (water and higher alcohols) descend to the bottom of the column, while the intermediate components (i.e., 70% alcohol) are usually drawn from the middle of the column via a liquid side stream.
[0004] While this method achieves some initial separation of fusel oils, existing separation processes typically separate 70% alcohol in liquid form. This leads to a water content in the 70% alcohol easily exceeding 30%, resulting in inherent defects such as insufficient separation precision and inability to meet product quality specifications. Therefore, it is necessary to propose a distillation apparatus that can reduce the water content of the alcohol product, improve separation precision, and thus enhance separation efficiency and product purity, thereby improving the purity of fusel oils. Summary of the Invention
[0005] To address the aforementioned problems, this invention provides a distillation apparatus for improving the purity of fusel oil. By improving the fusel oil separation process and designing the gas phase side inlet above the first theoretical plate, gaseous 70 alcohol can be effectively extracted, thereby reducing the water content in the 70 alcohol. The distillation unit then provides space for secondary purification of the 70 alcohol, further improving its purity. This effectively enhances the separation efficiency and product purity of fusel oil.
[0006] To achieve the above objectives, the technical solution of the present invention is as follows: A distillation apparatus for improving the purity of fusel oil includes a fusel oil feedstock preheater, a fusel oil distillation column, and a distiller; the outlet of the feedstock preheater is connected to the inlet of the fusel oil distillation column; a 95% alcohol distillation outlet is opened at the top of the fusel oil distillation column, and a first reflux port is opened on the upper side wall of the fusel oil distillation column, wherein a first recovery component for recovering and purifying 95% alcohol is provided at the first reflux port; a plurality of first theoretical plates are fixedly connected to the inner side wall of the fusel oil distillation column in an alternating manner; a gas phase side sampling port is opened on the middle side wall of the fusel oil distillation column, and the first... The theoretical plates are all located below the gas phase side inlet; the gas phase side inlet is connected to the distillation unit inlet, the top of the distillation unit has a 70% alcohol distillation outlet, the upper side wall of the distillation unit has a second reflux port, and the second reflux port is equipped with a second recovery component for recovering and purifying 70% alcohol; several second theoretical plates are fixedly connected to the inner side wall of the distillation unit in an alternating manner; the bottom of the fusel oil distillation column has a second drain outlet, which is connected to the lower side wall of the fusel oil distillation column, and the connection point between the two is located between the first theoretical plates; the bottom of the fusel oil distillation column is equipped with a heating component for continuously heating the raw materials inside.
[0007] The technical principle of the above solution is as follows: After being heated in a fusel oil feed preheater, the raw material is fed into a fusel oil distillation column. Heating components continuously heat the feed material within the column, while constant cooling and evaporation occur on the first theoretical plate, resulting in initial separation of the fusel oil. During this process, high-purity 95% alcohol is produced at the top of the column and enters the first reflux assembly for further purification. Vapor rich in 70% alcohol collected from the vapor side enters the distiller for further purification. Inside the distiller, multiple second theoretical plates continuously purify the 70% alcohol-rich vapor. A second recovery assembly condenses and separates the vapor, achieving efficient separation of 70% alcohol and water: 70% alcohol is enriched at the top of the column to ensure product purity; water is enriched at the bottom and returned to the fusel oil distillation column for further purification.
[0008] The above approach has the following beneficial effects: 1. In the prior art, 95% alcohol and 70% alcohol are separated by extracting liquid 70% alcohol; however, this method can easily lead to the water content in 70% alcohol exceeding 30%, resulting in insufficient separation accuracy and the final product failing to meet product quality specifications. Compared to the prior art, this invention designs the gas phase side inlet above the first theoretical plate. Since the raw material above the first theoretical plate has already become a gas phase, and the concentration of light components in the raw material after purification by the first theoretical plate is higher than that of the liquid phase on any other plate, the extracted 70% alcohol has an extremely high concentration and extremely low water content. This extraction process can effectively improve the separation efficiency and product purity of fusel oil.
[0009] 2. In this invention, the design of the distillation unit provides a flow channel and operating space for secondary purification of 70 alcohol. The vapor entering the distillation unit is intercepted by the second theoretical plate. Since the volatility of water and 70 alcohol differs greatly, water is difficult to continue to evaporate under the interception of the second theoretical plate, while 70 alcohol will continue to evaporate. Therefore, the second theoretical plate will further separate 70 alcohol and water, thereby improving the purity of 70 alcohol.
[0010] 3. In this invention, due to the design of the gas phase side inlet and the distillation unit, the workload of the fusel oil distillation column can be effectively shared, so that the fusel oil distillation column is mainly used to extract 95% alcohol. This improves the extraction efficiency and purification accuracy of 70% alcohol while also increasing the purification efficiency of 95% alcohol, thus effectively improving the working efficiency of the entire purification process.
[0011] Furthermore, the bottom of the fusel oil distillation column has a first drain outlet, which is connected to the inlet of the feed preheater. A drainage component for discharging wastewater from the fusel oil distillation column is provided at the connection point between the two.
[0012] Beneficial effects: This solution, through the design of the first drainage outlet, can transport the high-temperature wastewater at the bottom of the fusel oil distillation tower to the fusel oil feedstock preheater, and then use the waste heat of the wastewater to further heat the feedstock, thereby realizing the recycling of thermal energy.
[0013] Furthermore, the drainage assembly includes a drainage pump and a controller, the controller being used to control the operation of the drainage pump, thereby discharging the wastewater from the fusel oil distillation tower.
[0014] Beneficial effects: This solution, through the design of a drainage pump, can effectively improve the efficiency of wastewater and heat transfer.
[0015] Furthermore, the heating assembly includes a reboiler, and a controller is used to control the operation of the reboiler, thereby continuously heating the raw material.
[0016] Beneficial effects: This solution, through the design of the reboiler, can effectively ensure the continuous heating of the raw materials.
[0017] Furthermore, the first recovery component includes a first condenser, the inlet of which is connected to the outlet of the 95% alcohol distillate, and the outlet of which is connected to a first reflux tank; the outlet of the first reflux tank is connected to a first reflux pump, and the first reflux pump is connected to a first reflux port; the controller is used to control the operation of the first reflux pump, thereby transporting the material in the first reflux tank back to the fusel oil distillation column.
[0018] Beneficial effects: The first condenser can cool the water and 95% alcohol. Since water requires a higher evaporation temperature than 95% alcohol, the water in the 95% alcohol will be further separated and returned to the first reflux tank and discharged by the first reflux pump, thereby obtaining purified 95% alcohol.
[0019] Furthermore, the second recovery component includes a second condenser, the inlet of which is connected to the outlet of the 70 alcohol distillate, and the outlet of which is connected to a second reflux tank; the outlet of the second reflux tank is connected to a second reflux pump, which is connected to a second reflux port; the controller is used to control the operation of the second reflux pump, thereby transporting the material in the second reflux tank back to the distiller.
[0020] Beneficial effects: The second condenser can cool the water and 70 alcohol. Since water requires a higher evaporation temperature than 70 alcohol, the water in the 70 alcohol will be further separated and returned to the second reflux tank. It will then be pumped back to the fusel oil distillation tower to obtain purified 70 alcohol.
[0021] Furthermore, the number of the first theoretical boards is 2-4.
[0022] Beneficial effects: Too few first theoretical plates will lead to insufficient separation effect; too many first theoretical plates will increase unnecessary tower height and cost, and also increase energy consumption. 2-4 first theoretical plates can reduce process cost while ensuring separation effect.
[0023] Furthermore, the number of the second theoretical boards is 5-8.
[0024] Beneficial effects: 5-8 theoretical plates provide ample space for mass and heat transfer in the distillation unit. Within this range, moisture in the rising vapor is fully condensed and refluxed to the bottom of the column, while 70% alcohol is effectively enriched at the top, ensuring that the water content of the 70% alcohol remains below 30%.
[0025] Furthermore, a temperature sensor and a moisture detector are fixedly connected to the outlets of both the first and second condensers. The temperature sensor and the moisture detector are used to collect the temperature and moisture content of the product, and the controller is used to receive the temperature value collected by the temperature sensor and the moisture content detected by the moisture detector and transmit them to the user end.
[0026] Beneficial effects: Users can monitor the temperature and moisture content of the product in real time, thereby quickly judging product quality and adjusting process parameters.
[0027] Furthermore, the spacing between adjacent first theoretical plates and the spacing between adjacent second theoretical plates are 300-500mm.
[0028] Beneficial effects: A gap of less than 300mm between the first and second theoretical plates restricts the upward channel of steam, making it easy for droplets on the surface of the lower first and second theoretical plates to be carried by the airflow to the upper first and second theoretical plates, resulting in a decrease in separation efficiency. On the other hand, an excessively large gap between the plates will increase the process cost.
[0029] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description
[0030] Figure 1 This is a process flow diagram of the distillation apparatus for improving the purity of fusel oil according to the present invention.
[0031] Figure 2 This is a process flow diagram of the extraction of 95% alcohol in the distillation apparatus for improving the purity of fusel oil according to the present invention.
[0032] Figure 3 This is a process flow diagram of 70% alcohol extraction in a distillation apparatus for improving the purity of fusel oil according to the present invention.
[0033] Figure 4 This is a process flow diagram of the first recovery component in the distillation apparatus for improving the purity of fusel oil according to the present invention.
[0034] Figure 5 This is a process flow diagram of the second recovery component in the distillation apparatus for improving the purity of fusel oil according to the present invention.
[0035] The reference numerals in the accompanying drawings include: E-01, reboiler; E-02, first condenser; E-03, feed preheater; E-04, second condenser; T-01, fusel oil distillation column; T-02, distiller; P-01, first reflux pump; P-02, drain pump; P-03, second reflux pump; V-01, first reflux tank; V-03, second reflux tank. Detailed Implementation
[0036] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. 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.
[0037] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0038] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.
[0039] The following detailed description illustrates the specific implementation method: Implementation, for example Figure 1 As shown, a distillation apparatus for improving the purity of fusel oil includes a fusel oil feedstock preheater E-03, a fusel oil distillation column T-01, and a distiller T-02; the outlet of the feedstock preheater E-03 is connected to the inlet of the fusel oil distillation column T-01.
[0040] like Figure 2 As shown, the fusel oil distillation column T-01 has a 95% alcohol distillation outlet at the top, and a first reflux port on the upper side wall of the fusel oil distillation column T-01. The first reflux port is equipped with a first recovery component for recovering and purifying 95% alcohol. Four first theoretical plates are staggered and welded to the inner side wall of the fusel oil distillation column T-01. A gas phase side intake port is opened on the middle side wall of the fusel oil distillation column T-01, and the first theoretical plates are all located below the gas phase side intake port.
[0041] like Figure 4 As shown, the first recovery component includes a first condenser E-02 and a controller. The inlet of the first condenser E-02 is connected to the outlet of the 95% alcohol distillate, and the outlet of the first condenser E-02 is connected to a first reflux tank V-01. The outlet of the first reflux tank V-01 is connected to a first reflux pump P-01, and the first reflux pump P-01 is connected to a first reflux port. The controller is used to control the operation of the first reflux pump P-01, thereby transporting the material in the first reflux tank V-01 back to the fusel oil distillation column T-01.
[0042] like Figure 3As shown, the gas phase side inlet is connected to the inlet of distiller T-02. Distiller T-02 has a 70% alcohol distillation outlet at the top and a second reflux port on the upper side wall. A second recovery assembly for recovering and purifying 70% alcohol is provided at the second reflux port. Eight second theoretical plates are staggered and welded to the inner side wall of distiller T-02. The bottom of fusel oil distillation column T-01 has a second drain outlet, which is connected to the lower side wall of fusel oil distillation column T-01. The connection between the two is located between the first theoretical plates. The bottom of fusel oil distillation column T-01 is provided with a heating assembly for continuously heating the raw material inside. The heating assembly includes a reboiler E-01. A controller is used to control the operation of reboiler E-01, thereby continuously heating the raw material (using 0.4MPa saturated steam for heating, controlling the column bottom temperature to 105-110℃).
[0043] like Figure 5 As shown, the second recovery assembly includes a second condenser E-04, the inlet of which is connected to the outlet of the 70% alcohol distillate, and the outlet of which is connected to a second reflux tank V-03; the outlet of the second reflux tank V-03 is connected to a second reflux pump P-03, which is connected to a second reflux port; the controller is used to control the operation of the second reflux pump P-03, thereby transporting the material in the second reflux tank V-03 back to the distiller T-02.
[0044] Specifically, at the start of the process, the raw material is heated in the fusel oil feedstock preheater E-03 (preheating temperature 75-80℃) and then transported to the fusel oil distillation column T-01. The feedstock in the fusel oil distillation column T-01 is continuously heated by the reboiler E-01, causing the feedstock to evaporate and form steam. The first theoretical plate intercepts the steam, and the steam will continuously cool and evaporate on the surface of the first theoretical plate. Due to the different volatility of water, 70% alcohol and 95% alcohol, water, 70% alcohol and 95% alcohol will gradually separate.
[0045] During this process, vapor rich in 70% alcohol, at a temperature of approximately 88-92℃, is collected through the vapor-side inlet into distiller T-02 for further purification. Inside distiller T-02, the 70% alcohol-rich vapor is intercepted by the second theoretical plate, where it continuously cools and evaporates, separating the water and 70% alcohol. The vapor then enters the second condenser, E-04, which cools the water and 70% alcohol to 68-70℃. Since water requires a higher evaporation temperature than 70% alcohol, the water within the 70% alcohol is further separated and returned to the second reflux tank V-03. The user activates the second reflux pump P-03 via the controller, which pumps the water back to the bottom of fusel oil distillation column T-01, while the 70% alcohol is extracted in a gaseous state, yielding purified 70% alcohol (the extracted 70% alcohol product temperature is stable at 68-70℃).
[0046] Meanwhile, vapors rich in 95% alcohol, at a temperature of approximately 67-69℃, accumulate at the top of the fusel oil distillation column T-01 and enter the first condenser E-02. The first condenser E-02 cools the water and 95% alcohol to 40-45℃. Since water requires a higher evaporation temperature than 95% alcohol, the water in the 95% alcohol is pre-cooled into a liquid state and refluxed back to the first reflux tank V-01. The user starts the first reflux pump P-01 through the controller. The first reflux pump P-01 transports the water back to the bottom of the fusel oil distillation column T-01, while the 95% alcohol is extracted in a gaseous state, thus obtaining purified 95% alcohol (the temperature of the extracted 95% alcohol product is stable at 40-42℃).
[0047] The fusel oil distillation column T-01 has a first drain outlet at the bottom, which is connected to the inlet of the raw material preheater E-03. A drainage assembly is provided at the connection point for discharging wastewater from the fusel oil distillation column T-01. The drainage assembly includes a drainage pump P-02, and a controller is used to control the operation of the drainage pump P-02, thereby discharging the wastewater in the fusel oil distillation column T-01.
[0048] Specifically, moisture accumulates at the bottom of the fusel oil distillation column T-01 via the first reflux pump P-01 and the second reflux pump P-03, forming high-temperature wastewater (approximately 98-100℃). This wastewater is discharged through the first drain outlet. During discharge, the user can activate the drain pump P-02 via the controller to transport the wastewater to the raw material preheater E-03, utilizing the high temperature of the wastewater to preheat the raw material, thus achieving the recycling of thermal energy. Temperature sensors and moisture detectors are fixedly connected to the outlets of the first condenser E-02 and the second condenser E-04 with screws. The temperature sensors and moisture detectors are used to collect the temperature and moisture content of the product. The controller is used to receive the temperature value collected by the temperature sensor and the moisture content detected by the moisture detector and transmit them to the user terminal (such as mobile phone, computer and tablet, etc., and a mobile phone is selected in this embodiment).
[0049] Specifically, the temperature sensor and moisture detector can collect the temperature and moisture content of the product. The controller can transmit these two data points to the user's mobile phone. The user can then monitor the product's temperature and moisture content in real time via their mobile phone, thereby quickly judging product quality, adjusting process parameters, and improving the intelligence and controllability of the process flow.
[0050] The spacing between adjacent first theoretical plates and adjacent second theoretical plates is 300 mm. If the spacing between the first and second theoretical plates is less than 300 mm, it will restrict the upward channel of the steam, making it easy for droplets on the surface of the lower first and second theoretical plates to be carried by the airflow to the upper first and second theoretical plates, resulting in a decrease in separation efficiency. On the other hand, if the spacing between the plates is greater than 400 mm, it will excessively increase the process cost.
[0051] In existing technologies, 95% alcohol and 70% alcohol are separated by extracting liquid 70% alcohol. However, this method can easily lead to the water content in 70% alcohol exceeding 30%, resulting in insufficient separation accuracy and the final product failing to meet product quality specifications. Compared to existing technologies, this invention designs the gas phase side inlet above the first theoretical plate. Since the raw material above the first theoretical plate has already become a gas phase, and the concentration of light components in the raw material after purification by the first theoretical plate is higher than that of the liquid phase on any other plate, the extracted 70% alcohol has an extremely high concentration and extremely low water content (approximately 25-28%). This extraction process can effectively improve the separation efficiency and product purity of fusel oil.
[0052] Meanwhile, the design of the T-02 distillation unit in this invention provides an operating space for secondary purification of 70 alcohol, further improving the purity of 70 alcohol and effectively improving the separation efficiency and product purity of fusel oil.
[0053] Furthermore, the design of the gas-phase side inlet and the distillation unit T-02 in this invention can effectively share the workload of the fusel oil distillation column T-01, so that the fusel oil distillation column T-01 is mainly used to extract 95% alcohol. This allows the process to improve the extraction efficiency and purification accuracy of 70% alcohol while also improving the purification efficiency of 95% alcohol, thus effectively improving the overall efficiency of the purification process.
[0054] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.
Claims
1. A distillation apparatus for improving the purity of fusel oil, characterized in that, It includes a fusel oil feedstock preheater (E-03), a fusel oil distillation column (T-01), and a distillation unit (T-02); the outlet of the feedstock preheater (E-03) is connected to the inlet of the fusel oil distillation column (T-01); The fusel oil distillation column (T-01) has a 95% alcohol distillation outlet at the top. The upper side wall of the fusel oil distillation column (T-01) has a first reflux port, and a first recovery component for recovering and purifying 95% alcohol is installed at the first reflux port. The upper part of the fusel oil distillation column (T-01) is structured packing, and the lower part is a tray. The middle side wall of the fusel oil distillation column (T-01) has a vapor phase side inlet, and the first theoretical plate is located below the vapor phase side inlet. The vapor phase inlet is connected to the inlet of the distillation unit (T-02). The top of the distillation unit (T-02) has a 70% alcohol distillation outlet, and the upper side wall of the distillation unit (T-02) has a second reflux port. The second reflux port is equipped with a second recovery component for recovering and purifying 70% alcohol. The distillation unit (T-02) is a plate column with several second theoretical plates fixedly connected to its inner side wall in an alternating manner. The bottom of the fusel oil distillation column (T-01) has a second drain outlet, which is connected to the lower side wall of the fusel oil distillation column (T-01) near the bottom of the column. The connection point between the two is located between the first theoretical plates. The bottom of the fusel oil distillation column (T-01) is equipped with a heating element for continuously heating the raw materials inside.
2. The distillation apparatus for improving the purity of fusel oil according to claim 1, characterized in that, The fusel oil distillation column (T-01) has a first drain outlet at the bottom, which is connected to the inlet of the raw material preheater (E-03). A drainage component is provided at the connection point between the two for discharging wastewater from the fusel oil distillation column (T-01).
3. The distillation apparatus for improving the purity of fusel oil according to claim 2, characterized in that, The drainage assembly includes a drainage pump (P-02) and a controller, which controls the operation of the drainage pump (P-02) to discharge wastewater from the fusel oil distillation tower (T-01).
4. The distillation apparatus for improving the purity of fusel oil according to claim 1, characterized in that, The heating assembly includes a reboiler (E-01), and a controller is used to control the operation of the reboiler (E-01) to continuously heat the raw materials.
5. The distillation apparatus for improving the purity of fusel oil according to claim 1, characterized in that, The first recovery assembly includes a first condenser (E-02), the inlet of which is connected to the outlet of the 95% alcohol distillate, and the outlet of which is connected to a first reflux tank (V-01); the outlet of the first reflux tank (V-01) is connected to a first reflux pump (P-01), and the first reflux pump (P-01) is connected to a first reflux port; the controller is used to control the operation of the first reflux pump (P-01), thereby transporting the material in the first reflux tank (V-01) back to the fusel oil distillation column (T-01).
6. The distillation apparatus for improving the purity of fusel oil according to claim 1, characterized in that, The second recovery assembly includes a second condenser (E-04), the inlet of which is connected to the outlet of the 70 alcohol distillate, and the outlet of which is connected to a second reflux tank (V-03). The outlet of the second reflux tank (V-03) is connected to a second reflux pump (P-03), which is connected to a second reflux port. A controller is used to control the operation of the second reflux pump (P-03), thereby transporting the material in the second reflux tank (V-03) back to the distiller (T-02).
7. The distillation apparatus for improving the purity of fusel oil according to claim 1, characterized in that, The number of the first theoretical boards is 2-4.
8. The distillation apparatus for improving the purity of fusel oil according to claim 1, characterized in that, The second theoretical board consists of 5-8 boards.
9. The distillation apparatus for improving the purity of fusel oil according to claim 6, characterized in that, Temperature sensors and moisture detectors are fixedly connected to the outlets of both the first condenser (E-02) and the second condenser (E-04). The temperature sensors and moisture detectors are used to collect the temperature and moisture content of the product. The controller is used to receive the temperature value collected by the temperature sensor and the moisture content detected by the moisture detector and transmit them to the user terminal.
10. The distillation apparatus for improving the purity of fusel oil according to claim 1, characterized in that, The spacing between adjacent first theoretical plates and the spacing between adjacent second theoretical plates are 300-400mm.