Iodine separation device and method

Abstract

The invention discloses an iodine separation device and method. The device comprises a sealing cover as well as a hot solution tank, a cold column, a scraper blade and an iodine collection device which are arranged in the sealing cover, the cold column is arranged at the upper part of the hot solution tank, one end of the scraper is connected to the iodine collecting device, and the other end is lapped on the outer surface of the cold column. The method comprises the steps that the pressure in the starting sealing cover is kept to be lower than one atmospheric pressure; the cold column is rotated, so that the scraping plate is tightly attached to the cold column; the surface temperature of the cold column is lower than 35 DEG C; a mixed solution of hydrogen iodide and iodine is injected into a hot solution tank, the temperature of the mixed solution is gradually increased, after the temperature reaches 44 DEG C or above, iodine begins to sublimate, iodine steam emerges from the mixed solution, and after the iodine steam upwards encounters the surface of a low-temperature cold column, the iodine is condensed on the surface of the cold column; in the rotating process of the cold column, iodine condensed on the surface of the cold column is shoveled and scraped by the scraping plate and falls off after reaching the scraping plate, and the iodine falls into the iodine collecting device along the scraping plate. The method has the advantages of being simple in technological process and low in energy consumption.

Description

Technical Field

[0001] The present invention belongs to the technical fields of hydrogen production and boiler environmental protection, and particularly relates to an iodine separation device and method. Background Art

[0002] In the sulfur-iodine cycle for hydrogen production, sulfur dioxide, iodine and water react to produce sulfuric acid solution and hydrogen iodide solution. In order to separate the sulfuric acid solution and the hydrogen iodide solution, an excessive amount of iodine needs to be added. The hydrogen iodide solution can dissolve a large amount of iodine, and the resulting mixed solution of hydrogen iodide and iodine has a large density, while the sulfuric acid solution has a small density. By using the density difference, the mixed solution of hydrogen iodide and iodine is stratified from the sulfuric acid solution, thereby realizing the separation of the mixed solution of hydrogen iodide and iodine from the sulfuric acid solution.

[0003] The obtained mixed solution of hydrogen iodide and iodine needs to further remove the iodine in the hydrogen iodide solution in order to further realize the catalytic decomposition of the hydrogen iodide solution. Currently, in the laboratory, the separation of hydrogen iodide solution and iodine adopts the methods of electrodialysis and rectification. These methods have relatively complex technological processes and high energy consumption. Summary of the Invention

[0004] The present invention provides an iodine separation device and method for separating iodine from a mixed solution of hydrogen iodide and iodine with a simple technological process and low energy consumption.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: An iodine separation device includes a sealing cover, a hot solution tank, a cold column, a scraper and an iodine collection device arranged in the sealing cover; the cold column is placed above the hot solution tank, one end of the scraper is connected to the iodine collection device, and the other end is placed on the outer surface of the cold column.

[0006] A further improvement of the present invention is that the hot solution tank is filled with a mixed solution of hydrogen iodide and iodine.

[0007] A further improvement of the present invention is that a heating device is arranged in the hot solution tank, which can ensure that the temperature of the mixed solution is not lower than 90°C; a stirring device is arranged in the hot solution tank, which can ensure that the temperature is uniform during the heating process of the mixed solution.

[0008] A further improvement of the present invention is that a cooling device is arranged in the cold column, a coolant is arranged in the cooling device, the temperature of the coolant is not higher than 30°C, the outer surface of the cold column is a smooth cylinder, and its outer surface temperature is not higher than 35°C. The cold column has a driving device for driving the cold column to rotate.

[0009] A further improvement of the present invention is that the coolant is cooling water or a mixture of ice and water.

[0010] A further improvement of the present invention is that a negative pressure suction device is arranged in the sealing cover, which can keep the pressure in the sealing cover lower than 1 atmosphere according to needs.

[0011] A further improvement of the present invention lies in that the diameter of the cold column is greater than the width of the hot solution tank; there is a gap of 0.1 mm to 1 mm between the side wall of the hot solution tank close to the scraper and the outer surface of the cold column, and there is a gap of 1 mm to 3 mm between the side wall of the hot solution tank far from the scraper and the outer surface of the cold column; by controlling the liquid level of the solution in the hot solution tank, it is ensured that the solution does not contact the outer surface of the cold column.

[0012] A further improvement of the present invention lies in that the scraper is elastic; the upper surface of the scraper is smooth and the angle with the horizontal plane is greater than 45°, so that the iodine falling on it can slide down smoothly.

[0013] A further improvement of the present invention lies in that the length of the scraper is not less than the height of the cold column.

[0014] An iodine separation method, which is based on the iodine separation device described above, includes: Start the negative pressure suction device in the sealing cover and keep the pressure in the sealing cover lower than 1 atmosphere; Rotate the cold column to determine that its rotation direction faces the scraper, and the scraper is in close contact with the cold column; Start the cooling device in the cold column to make its surface temperature lower than 35 °C; Inject the mixed solution of hydrogen iodide and iodine into the hot solution tank, start the stirring device, start the heating device, and gradually increase the temperature of the mixed solution. After the temperature reaches above 44 °C, iodine starts to sublime, and iodine vapor emerges from the mixed solution. When the iodine vapor encounters the surface of the cold column with a lower temperature upward, iodine sublimes on the surface of the cold column; During the rotation of the cold column, when the iodine condensed on the surface of the cold column reaches the scraper, it is scraped off by the scraper and falls along the scraper into the iodine collection device; As the temperature of the mixed solution in the hot solution tank rises, the sublimation and condensation of iodine become more intense; After the temperature of the mixed solution reaches above 90 °C, maintain the solution temperature stable until there is no more iodine sublimation in the mixed solution, so as to realize the separation of iodine from the mixed solution of hydrogen iodide and iodine.

[0015] Compared with the prior art, the present invention has at least the following beneficial technical effects: An iodine separation device and method provided by the present invention utilize the characteristics that iodine sublimes starting from 45°C and finishes sublimating at 77°C under one atmosphere. The mixed solution of hydrogen iodide and iodine in the hot solution tank is heated to above 90°C, enabling the iodine dissolved in the mixed solution to sublime. Through a simple technological process, the purpose of removing iodine from the mixed solution of hydrogen iodide and iodine is achieved; under one atmosphere, when the sublimated iodine vapor has a temperature below 45°C, it will sublime and condense into a solid. In the solution provided by the present invention, a cold column is arranged above the hot solution tank, and the surface temperature of the cold column is lower than 35°C. The iodine vapor sublimated from the hot solution tank will sublime and condense into a solid after encountering the relatively low-temperature surface of the cold column, and the iodine vapor adheres to the surface of the cold column; as the cold column rotates, the iodine adhering to the surface of the cold column reaches the scraper and is scraped off, falling along the scraper into the iodine collection device. Through a simple technological process, the collection of iodine is achieved.

[0016] Furthermore, by utilizing the negative pressure suction function of the sealing cover, the pressure inside the hot solution tank can be made lower than 1 atmosphere, so that the sublimation and condensation temperatures of iodine can be further reduced; at the same time, maintaining the entire device in a negative pressure state can also prevent the escape of iodine vapor and reduce environmental pollution.

[0017] In summary, the present invention removes iodine from the mixed solution of hydrogen iodide and iodine at a temperature not higher than 100°C. Compared with the current methods of electrodialysis and rectification, the technological process is simple and the energy consumption is lower. Description of the Drawings

[0018] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 It is a structural block diagram of an iodine separation device of the present invention.

[0020] Description of the Reference Numerals in the Drawings: 1. Hot solution tank, 2. Cold column, 3. Scraper, 4. Iodine collection device, 5. Sealing cover. Detailed Embodiments

[0021] In the following text, only some exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the present invention. Therefore, the drawings and the description are considered to be exemplary in nature rather than restrictive.

[0022] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0023] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality of" means two or more unless otherwise specifically defined.

[0024] In the present invention, unless otherwise clearly defined and limited, the terms "mounted", "connected", "coupled", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or a communication connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "under" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

[0026] It should also be understood that the terms used in the description of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the description of the present invention and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include the plural forms.

[0027] It should be further understood that the term "and / or" used in the specification and appended claims of the present invention refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0028] Schematic diagrams of various structures according to the disclosed embodiments of the present invention are shown in the drawings. These figures are not drawn to scale, where for the purpose of clear expression, certain details are enlarged and certain details may be omitted. The shapes of various regions and layers shown in the figures, as well as their relative sizes and positional relationships, are merely exemplary and may deviate in practice due to manufacturing tolerances or technical limitations. Those skilled in the art can additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0029] Embodiments of the present invention will be described in detail below with reference to the drawings.

[0030] Embodiment 1 As Figure 1 shown, an iodine separation device provided in this embodiment includes a sealing cover 5, and a hot solution tank 1, a cold column 2, a scraper 3, and an iodine collection device 4 arranged in the sealing cover 5; the cold column 2 is placed above the hot solution tank 1, one end of the scraper 3 is connected to the iodine collection device 4, and the other end is placed on the outer surface of the cold column 2.

[0031] In this embodiment, the hot solution tank 1 is filled with a mixed solution of hydrogen iodide and iodine, where the mass percentage concentration of hydrogen iodide is 10% and the mass percentage concentration of iodine is 20%; a heating device is arranged in the hot solution tank 1 to ensure that the temperature of the mixed solution is not lower than 90 °C; a stirring device is arranged in the hot solution tank 1 to ensure that the temperature is uniform during the heating process of the mixed solution.

[0032] The heating device converts energy in forms such as electrical energy, gas energy, and light energy into heat energy, and transfers the heat energy to the heated object to increase the temperature of the heated object. In the hot solution tank 1, the heating device may adopt the following two common methods: Resistance heating: The resistance wire is affected by the current, and a resistance heating phenomenon occurs, converting electrical energy into heat energy to generate heat and heat the solution. Electromagnetic induction heating: Using the principle of electromagnetic induction, electrical energy is converted into heat energy. After the electromagnetic heater is powered on, electrical energy is converted into magnetic field energy to generate a high-frequency magnetic field, causing the ferromagnetic material inside the hot solution tank to generate an eddy current effect, thereby converting the magnetic field energy into heat energy to achieve heating of the solution.

[0033] The stirring device transfers mechanical energy to the fluid effectively by rotating the stirring blades, forming a highly turbulent and fully mixed area, and generating a strong high-speed jet to drive the liquid to circulate in the stirring container. In the hot solution tank 1, a vertical shaft forced stirring device may be adopted, and its working principle is as follows: the motor drives the vertical shaft to rotate, and then drives the stirring arm and stirring blades to perform circular motion. During the stirring process, these blades continuously extrude, flip, and toss the material, thus forming strong convection and shear effects in the stirring cylinder, making the material particles evenly distributed and achieving an ideal stirring effect.

[0034] In this embodiment, the cold column 2 is equipped with a cooling device. Circulating cooling water flows through the cooling device, the temperature of the coolant is not higher than 30 °C, the outer surface of the cold column 2 is a smooth cylindrical shape, and its outer surface temperature is not higher than 35 °C. The cold column 2 has a driving device for driving the cold column 2 to rotate.

[0035] The cooling device realizes temperature reduction through circulating cooling water. In the cold column 2, the cooling device may adopt the form of a cooling tower, and its working principle is as follows: Open cooling tower: The circulating water is sprayed in the form of mist onto the fiberglass filler, and heat exchange is carried out by the contact of water and air. Subsequently, the fan drives the air flow in the tower to circulate, and discharges the heated air flow after heat exchange, thus achieving the cooling effect. Closed cooling tower: Cooling is achieved through two internal and external cycles. The internal cycle is connected to the cold column 2 to form a closed circulation system, with soft water as the medium to cool the cold column 2 and introduce the heat in the cold column 2 into the cooling unit. The external cycle is designed specifically for the cooling tower itself and does not come into direct contact with the internal cycle water. Instead, heat exchange and heat dissipation are carried out through the copper tube surface cooler, thereby reducing the temperature of the cooling tower.

[0036] The driving device is used to drive the cold column 2 to rotate, and its working principle varies depending on the driving method. In the cold column 2, the driving device can adopt methods such as a reduction motor drive or an electric roller drive. Taking the reduction motor drive as an example, its working principle is: the motor provides power, the speed is reduced and the torque is increased through the reducer, thereby driving the cold column 2 to rotate.

[0037] In this embodiment, the diameter of the cold column 2 is larger than the width of the hot solution tank 1; there is a gap of 0.1 mm to 1 mm between the side wall of the hot solution tank 1 near the scraper 3 and the outer surface of the cold column 2, and there is a gap of 1 mm to 3 mm between the side wall of the hot solution tank 1 far from the scraper 3 and the outer surface of the cold column 2; by controlling the liquid level of the solution in the hot solution tank 1, it will not contact the outer surface of the cold column 2.

[0038] In this embodiment, the scraper 3 is elastic. By utilizing the elasticity of the scraper 3, on the one hand, it ensures a certain bonding force with the cold column 2, and on the other hand, it does not hinder the rotation of the cold column 2. The upper surface of the scraper 3 is smooth and the angle with the horizontal plane is greater than 45°, enabling the iodine falling on it to slide down smoothly. The length of the scraper 3 is not less than the height of the cold column 2. The elasticity of the scraper 3 enables it to closely fit with the cold column 2, ensuring sufficient bonding force between the two. This bonding force helps prevent iodine from leaking through the gap between the scraper 3 and the cold column 2, thereby improving the sealing performance and collection efficiency of the device. Although the scraper 3 maintains a certain bonding force with the cold column 2, its elastic design also ensures that the scraper 3 does not impede the rotation of the cold column 2. The cold column 2 can rotate freely, which helps improve the flexibility and overall efficiency of the device. The smooth design of the upper surface of the scraper 3 reduces the adhesion of iodine on its surface. This design helps the iodine slide down smoothly, avoiding the accumulation of iodine on the scraper 3, thereby reducing the risk of blockage and improving the continuous operation ability of the device. The angle between the scraper 3 and the horizontal plane is greater than 45°. Such a design enables the iodine falling on it to slide down smoothly under the action of gravity. This design not only improves the collection efficiency of iodine but also reduces the iodine residue on the scraper 3, thereby maintaining the cleanliness and efficient operation of the device. The length of the scraper 3 is not less than the height of the cold column 2, ensuring that the scraper 3 can completely cover the surface of the cold column 2. This design helps collect and utilize iodine more effectively, avoiding the omission of iodine on the surface of the cold column 2, thereby improving the overall performance and efficiency of the device.

[0039] In this embodiment, there is a negative pressure suction device inside the sealing cover 5, which can maintain the pressure inside the sealing cover 5 below 1 atmosphere according to needs.

[0040] The negative pressure suction device guides the liquid and gas in the cavity out by generating and maintaining a negative pressure environment, so as to achieve the purpose of sewage purification or specific process requirements. In the sealing cover 5, the negative pressure suction device can be in the form of a vacuum pump, and its working principle is as follows: The air compression pump or vacuum pump is driven by an electric motor to generate negative pressure, and the air inside the sealing cover 5 is pumped out, so as to keep the internal pressure below 1 atmosphere. Such a negative pressure environment can effectively prevent external air from entering the sealing cover 5 and quickly discharge the gas inside it.

[0041] At the same time, when selecting the negative pressure suction device, the following factors can be comprehensively considered: Negative pressure requirement: According to the volume of the sealing cover 5 and the required negative pressure level, select a suitable vacuum pump model and power. Generally speaking, the pumping rate of the vacuum pump should be greater than the air leakage rate of the sealing cover 5 to ensure a stable negative pressure environment inside it.

[0042] Working environment: Consider factors such as the space and noise requirements at the installation location. For some environments sensitive to noise, a low-noise vacuum pump can be selected or sound insulation measures can be taken to reduce the impact of noise and vibration.

[0043] Budget constraints: Select a suitable negative pressure suction device according to the budget. High-performance vacuum pumps are more expensive but can provide a stable negative pressure environment and a longer service life; while some low-cost vacuum pumps may have poor performance or a shorter service life.

[0044] Example 2 As Figure 1 shown, a method for iodine separation provided in this example includes: Start the negative pressure suction device in the sealing cover 5 and keep the pressure in the sealing cover 5 below 1 atmosphere; Rotate the cold column 2 to determine that its turning direction faces the scraper 3, and the scraper 3 is in close contact with the cold column 2; Start the cooling device in the cold column 2 to make its surface temperature lower than 35°C; Inject the mixed solution of hydrogen iodide and iodine into the hot solution tank 1, start the stirring device, start the heating device, and gradually increase the temperature of the mixed solution. After the temperature reaches above 44°C, iodine starts to sublime, and iodine vapor emerges from the mixed solution. When the iodine vapor encounters the surface of the colder cold column 2, iodine sublimes and condenses on the surface of the cold column 2; During the rotation of the cold column 2, when the iodine condensed on the surface of the cold column 2 reaches the scraper 3, it is scraped off by the scraper 3 and falls along the scraper 3 into the iodine collection device 4; As the temperature of the mixed solution in the hot solution tank 1 increases, the sublimation and condensation of iodine become more intense; After the temperature of the mixed solution reaches above 90°C, maintain the solution temperature stable until there is no more iodine sublimation in the mixed solution, thus realizing the separation of iodine from the mixed solution of hydrogen iodide and iodine.

[0045] Example 3 In this example, the hot solution tank 1 is filled with a mixed solution of hydrogen iodide and iodine, where the mass percentage concentration of hydrogen iodide is 30% and the mass percentage concentration of iodine is 40%; a heating device is arranged in the hot solution tank 1 to ensure that the temperature of the mixed solution is not lower than 90°C; a stirring device is arranged in the hot solution tank 1 to ensure that the temperature of the mixed solution is uniform during the heating process.

[0046] In this example, the cold column 2 is filled with an ice-water mixture, the temperature of the coolant is 0°C, the outer surface of the cold column 2 is a smooth cylinder, its outer surface temperature is not higher than 5°C, and the cold column 2 has a driving device for driving the cold column 2 to rotate.

[0047] Iodine in the hot solution tank 1 sublimes, and the formed iodine vapor rises. After encountering the surface of the cold column 2, it sublimates and adheres to the surface of the cold column 2. As the cold column 2 rotates, the iodine encounters the scraper 3 and is scraped off by the scraper 3, sliding into the iodine collection device 4. The iodine concentration in the mixed solution in the hot solution tank 1 decreases, realizing the separation of iodine.

[0048] The foregoing has shown and described the basic principles, main features and advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.

[0049] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment only contains an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art. The above content is only to illustrate the technical idea of the present invention and cannot be used to limit the protection scope of the present invention. Any modification made on the basis of the technical solution according to the technical idea proposed by the present invention falls within the protection scope of the claims of the present invention.

Claims

1. An iodine separation device, characterized in that: It comprises a sealing cover (5) and a hot solution tank (1), a cold column (2), a scraper (3) and an iodine collecting device (4) arranged in the sealing cover (5); The cold column (2) is placed on the upper part of the hot solution tank (1), one end of the scraper (3) is connected to the iodine collecting device (4), and the other end is placed on the outer surface of the cold column (2).

2. An iodine separation device according to claim 1, characterized in that: The hot solution tank (1) contains a mixed solution of hydrogen iodide and iodine.

3. An iodine separation device according to claim 2, characterized in that: A heating device is arranged in the hot solution tank (1) to ensure that the temperature of the mixed solution is not lower than 90° C.; a stirring device is arranged in the hot solution tank (1) to ensure that the temperature of the mixed solution is uniform during the heating process.

4. An iodine separation device according to claim 3, characterized in that: The cold column (2) is provided with a cooling device, the cooling device is provided with a coolant, the temperature of the coolant is not higher than 30°C, the outer surface of the cold column (2) is a smooth cylindrical shape, the outer surface temperature is not higher than 35°C, and the cold column (2) has a driving device for driving the cold column (2) to rotate.

5. An iodine separation device according to claim 4, characterized in that: The coolant is cooling water or an ice-water mixture.

6. An iodine separation device according to claim 4, characterized in that: A negative pressure suction device is provided in the sealing cover (5), which can keep the pressure in the sealing cover (5) lower than 1 atmosphere as required.

7. An iodine separation device according to claim 1, characterized in that: The diameter of the cold column (2) is greater than the width of the hot solution tank (1); there is a gap of 0.1 mm to 1 mm between the side wall of the hot solution tank (1) close to the scraper (3) and the outer surface of the cold column (2); there is a gap of 1 mm to 3 mm between the side wall of the hot solution tank (1) away from the scraper (3) and the outer surface of the cold column (2); and the liquid level of the solution in the hot solution tank (1) is controlled so that it does not contact the outer surface of the cold column (2).

8. An iodine separation device according to claim 1, characterized in that: The scraper (3) is elastic; the upper surface of the scraper (3) is smooth, and the angle between the scraper (3) and the horizontal plane is greater than 45°, so that the iodine falling on the scraper (3) can slide down smoothly.

9. An iodine separation device according to claim 8, characterized in that: The length of the scraper (3) is not less than the height of the cold column (2).

10. An iodine separation method, characterized in that: The method is based on an iodine separation device according to claim 6, comprising: Starting the negative pressure suction device in the sealing cover (5) to keep the pressure in the sealing cover (5) lower than 1 atmosphere; Rotate the cooling column (2) to ensure that it is turned to face the scraper (3), and the scraper (3) is in close contact with the cooling column (2); Start the cooling device in the cold column (2) to make its surface temperature lower than 35°C; A mixed solution of hydrogen iodide and iodine is injected into a hot solution tank (1), and a stirring device and a heating device are started to gradually increase the temperature of the mixed solution. When the temperature reaches above 44°C, iodine begins to sublime, and iodine vapor emerges from the mixed solution. When the iodine vapor encounters the surface of a cold column (2) with a lower temperature, the iodine condenses on the surface of the cold column (2); During the rotation of the cold column (2), iodine condensed on the surface of the cold column (2) reaches the scraper (3), is scraped off by the scraper (3), and falls into the iodine collecting device (4) along the scraper (3); As the temperature of the mixed solution in the hot solution tank (1) increases, the sublimation and desublimation of iodine become more intense; After the temperature of the mixed solution reaches above 90° C., the temperature of the solution is maintained stable until no more iodine sublimates in the mixed solution, thereby achieving the separation of iodine from the mixed solution of hydrogen iodide and iodine.

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