An organic solvent recovery system

Abstract

The present invention discloses an organic solvent recovery system, which includes a fixed frame, a pretreatment mechanism, a first-stage adsorption tank, a second-stage adsorption tank, a condensation mechanism, a supergravity separation mechanism, a solvent recovery tank, a steam furnace and a vacuum adsorption pump, and a chimney at the rear end of the fixed frame. A spiral activated carbon plate is arranged in the first-stage adsorption tank, wherein an internal reinforcement column and a central electrode are arranged in the middle, an interlayer electrode is arranged in the plate, and a reversible power supply and a wiring pipe are arranged at the bottom. The pretreated waste gas passes through two-stage adsorption tanks in sequence. The first-stage adsorption tank uses activated carbon and electrodes for adsorption, and the second-stage adsorption tank uses membrane separation to treat special solvents. During desorption, the steam furnace and the vacuum adsorption pump work together to adjust the electric field. Afterwards, the solvent is purified through condensation and supergravity separation mechanism, and stored in the recovery tank. A small amount of waste gas is discharged through the chimney, which can efficiently recover organic solvents with complex components.

Description

Technical Field

[0001] The present invention relates to the field of environmental protection, and in particular to an organic solvent recovery system. Background Art

[0002] Organic solvents are widely used in industrial production processes, including chemicals, electronics, pharmaceuticals, and printing. However, their extensive use leads to the generation of large quantities of waste gases containing these solvents. Directly releasing these waste gases into the atmosphere can pose serious risks to the environment and human health. On the one hand, when organic solvents evaporate into the air, they form volatile organic compounds (VOCs). VOCs are important precursors to atmospheric pollution problems such as photochemical smog and ozone, exacerbating air pollution and affecting air quality and climate. On the other hand, many organic solvents are toxic, and long-term exposure to environments containing these solvents can damage the human respiratory, nervous, and immune systems.

[0003] Currently, the recovery and disposal of organic solvents has become an urgent environmental issue in industrial production. Traditional methods for recovering organic solvents include adsorption, condensation, and membrane separation, but these methods often have limitations when used alone. For example, after the adsorbent is saturated, the adsorption method requires effective desorption to restore the adsorbent's performance and recover the solvent. The condensation method has low recovery efficiency for low-concentration, low-boiling-point organic solvents. Membrane separation methods are subject to membrane fouling and high costs.

[0004] Furthermore, with increasingly stringent environmental regulations, standards for organic solvent waste gas emissions are also becoming increasingly stringent. This requires organic solvent recovery systems to not only have high recovery efficiency but also operate stably and efficiently to meet environmental requirements. In actual industrial applications, the organic solvents in waste gas have complex compositions, with large variations in concentration and flow rate, which further increases the difficulty of organic solvent recovery.

[0005] While existing technologies have proposed several improvements to address these issues, they still have limitations. For example, patent publication number CN220257590U discloses an organic waste gas solvent recovery device. However, this device still suffers from the following drawbacks: For some mixed solvents with complex compositions, existing recovery devices may not be able to achieve efficient separation and recovery. Different solvents have varying physical properties, such as boiling points and volatility, making it difficult to precisely control parameters like temperature and pressure during the recovery process. This can result in some solvents being unable to be fully recovered or having low purity after recovery. Summary of the Invention

[0006] (1) Technical problems solved

[0007] In response to the shortcomings of the existing technology, the present invention aims to provide an organic solvent recovery system that solves the problems existing in the existing technology. The invention comprehensively considers multiple technologies such as adsorption, condensation, and supergravity separation, and innovatively designs the adsorption tank, a key equipment in the adsorption process. The activated carbon plate is spiral-shaped, greatly increasing the contact area and time between the exhaust gas and the activated carbon. The central electrode and interlayer electrodes installed inside it are powered by a reversible power supply to generate an electric field, which enhances the adsorption effect on organic solvent molecules. Both polar and non-polar molecules can be adsorbed more efficiently, and desorption can be assisted by changing the direction of the electric field during the desorption stage. At the same time, internal reinforcement columns ensure the stability of the activated carbon plate structure, and the symmetrical wiring tubes at the bottom of the tank ensure a stable connection between the electrodes and the power supply. By installing a specially structured activated carbon plate and electrode system in the adsorption tank, and combining it with equipment such as a steam furnace and a vacuum adsorption pump, a new organic solvent recovery system is constructed, aiming to solve the problems existing in existing organic solvent recovery technology and improve the efficiency and quality of organic solvent recovery.

[0008] (2) Technical solution

[0009] To achieve the above-mentioned purpose, the present invention provides the following technical solution: an organic solvent recovery system, comprising a fixed frame, a pretreatment mechanism is provided on the right side of the fixed frame, a first-level adsorption tank is fixed at the lower end of the fixed frame, a second-level adsorption tank is provided on the left side of the first-level adsorption tank, a condensation mechanism is provided at the front of the fixed frame, the rear end of the condensation mechanism is connected to a supergravity separation mechanism, the left side of the supergravity separation mechanism is connected to a solvent recovery tank, a steam furnace is provided at the rear end of the fixed frame, and a vacuum adsorption pump is provided at the upper end of the fixed frame.

[0010] Preferably, the first-level adsorption tank includes a tank body, an activated carbon plate is fixed inside the tank body, an internal reinforcement column is provided in the middle of the activated carbon plate, a central electrode is provided in the middle of the internal reinforcement column, and an interlayer electrode is provided inside the activated carbon plate.

[0011] Preferably, the activated carbon plate is spiral-shaped, and the central electrode is arranged on the central axis of the spiral of the activated carbon plate.

[0012] Preferably, the interlayer electrode is a metal sheet, which is spirally embedded inside the activated carbon plate.

[0013] Preferably, the central electrode and the interlayer electrodes are insulated from the activated carbon plates.

[0014] Preferably, wiring tubes are symmetrically arranged on the bottom of the tank body.

[0015] Preferably, a reversible power supply is provided at the bottom of the tank, with the positive and negative poles of the reversible power supply connected to the two ends of the central electrode. The reversible power supply is used to generate an electric field. During the adsorption phase, it provides a suitable electric field for the central electrode. After the positive and negative poles are connected to the two ends of the central electrode, the central electrode generates an electric field around the activated carbon plate, enhancing the adsorption effect of the organic solvent molecules. Moreover, because it is a reversible power supply, during the desorption phase, the direction of the electric field can be changed by changing the direction of the current. The organic solvent molecules originally adsorbed on the activated carbon plate are subjected to an electric field force opposite to that during adsorption, thereby promoting the desorption of the organic solvent molecules from the activated carbon plate and realizing the recycling of the adsorption tank.

[0016] Preferably, the number of primary adsorption tanks is two. This forms a parallel processing mechanism. Even if one of the adsorption tanks experiences some minor malfunction or slight fluctuation in adsorption performance during operation, the other adsorption tank can still operate normally and continue to adsorb the exhaust gas, thereby ensuring the stability and continuity of the entire system's adsorption of organic solvents.

[0017] Preferably, the vacuum adsorption pump and the first-stage adsorption tank are connected via a pipeline.

[0018] Preferably, a chimney is provided at the rear end of the fixing frame.

[0019] (3) Beneficial effects

[0020] The purpose of the present invention is to provide an organic solvent recovery system. In terms of recovery capacity, a primary and secondary adsorption tank is provided to enhance the capture of organic solvents through two-stage adsorption, and the spiral activated carbon plate in the adsorption tank increases the contact area and time between the exhaust gas and the activated carbon. Its built-in electrode system enhances the adsorption effect, greatly improving the adsorption efficiency of the organic solvent. In terms of recovery quality, the condensation mechanism and the supergravity separation mechanism work together to effectively purify the organic solvent and improve its purity for reuse. The operating mode is flexible and stable, the reversible power supply can adjust the electric field according to the adsorption and desorption stages, and the steam boiler can assist in desorption and extend the life of the activated carbon. The system has good safety and environmental protection. The vacuum adsorption pump ensures safe operation and maintains appropriate pressure. The chimney provides a compliant emission channel for a very small amount of exhaust gas to avoid harm to the environment and personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of an organic solvent recovery system according to the present invention;

[0022] Figure 2 This is a schematic diagram of a primary adsorption tank in an organic solvent recovery system of the present invention;

[0023] Figure 3 A schematic diagram of an activated carbon plate in an organic solvent recovery system of the present invention;

[0024] Figure 4 for Figure 3 An enlarged view of point A in the schematic diagram of an activated carbon plate in an organic solvent recovery system of the present invention;

[0025] Figure 5 A schematic diagram of overall adsorption and discharge in an organic solvent recovery system of the present invention;

[0026] Figure 6 Schematic diagram of overall desorption and solvent recovery in an organic solvent recovery system of the present invention;

[0027] In the figure: 1-fixed frame, 2-pretreatment mechanism, 3-first-stage adsorption tank, 4-second-stage adsorption tank, 5-condensation mechanism, 6-supergravity separation mechanism, 7-solvent recovery tank, 8-steam furnace, 9-vacuum adsorption pump, 10-chimney, 31-tank body, 32-activated carbon plate, 33-internal reinforcement column, 34-center electrode, 35-interlayer electrode, 36-connection pipe, 37-reversible power supply. DETAILED DESCRIPTION

[0028] The following is a combination of the examples of the present invention Figures 1-6 A clear and complete description of the technical solutions in the embodiments of the present invention is provided. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0029] The present invention provides a technical solution: an organic solvent recovery system, such as Figure 1 As shown, it includes a fixed frame 1, a pretreatment mechanism 2 is provided on the right side of the fixed frame 1, a first-level adsorption tank 3 is fixed to the lower end of the fixed frame 1, a second-level adsorption tank 4 is provided on the left side of the first-level adsorption tank 3, a condensation mechanism 5 is provided at the front of the fixed frame 1, a supergravity separation mechanism 6 is connected to the rear end of the condensation mechanism 5, a solvent recovery tank 7 is connected to the left side of the supergravity separation mechanism 6, a steam furnace 8 is provided at the rear end of the fixed frame 1, and a vacuum adsorption pump 9 is provided at the upper end of the fixed frame 1. A chimney 10 is provided at the rear end of the fixed frame 1.

[0030] The fixed frame 1 serves as the support structure for the entire organic solvent recovery system, securely securing each functional component in its proper position and ensuring system stability and integrity. The pretreatment mechanism 2 primarily performs preliminary treatment on waste gas containing organic solvents. It includes a filter and a cooler, removing impurities such as particulate matter and dust from the waste gas, preventing them from entering subsequent equipment such as the adsorption tank, potentially damaging them or clogging the activated carbon pores, which could affect adsorption. The pretreatment mechanism also adjusts parameters such as the temperature and humidity of the waste gas to a state most suitable for subsequent recovery and processing. The primary adsorption tank 3 adsorbs the pretreated waste gas to remove the majority of the organic solvent. The secondary adsorption tank 4, supplementing the primary adsorption tank, re-adsorbs any residual organic solvent from the waste gas after the primary adsorption process, further reducing the organic solvent content and ensuring that the waste gas, after undergoing both adsorption stages, meets environmental emission standards. The condensation mechanism 5 cools the desorbed organic solvent vapor into a liquid state. During the desorption process, the organic solvent is desorbed from the surface of the activated carbon to form vapor. After these vapors enter the condensation mechanism, the heat is taken away by the cooling medium, and the organic solvent vapor is converted into liquid, which preliminarily realizes the separation of the solvent from other gases, providing conditions for subsequent supergravity separation and solvent recovery. The supergravity separation mechanism 6 further separates the liquid mixture after condensation. By utilizing the effect of the supergravity field, the impurities and residual water in the solvent are separated from the organic solvent under the action of centrifugal force, effectively improving the purity of the recovered solvent, ensuring that the recovered organic solvent is of higher quality and can be better reused. The solvent recovery tank 7 is used to collect the high-purity organic solvent obtained after supergravity separation. It is the final storage container for organic solvent recovery. The stored recovered solvent can be reused in industrial production and other links to achieve solvent recycling, reduce production costs and reduce the impact on the environment.

[0031] The steam furnace 8 is used to provide steam for the desorption of the activated carbon in the adsorption tank. After the activated carbon is saturated with adsorption, the steam generated by the steam furnace enters the adsorption tank. The high temperature and high energy of the steam are used to promote the desorption of organic solvent molecules from the surface of the activated carbon. At the same time, the steam can also clean the pores of the activated carbon, restore the adsorption performance of the activated carbon, extend the service life of the activated carbon, and ensure the long-term stable operation of the adsorption tank. The vacuum adsorption pump 9 is used to reduce the pressure in the adsorption tank during the desorption process, promote the desorption of organic solvent from the surface of the activated carbon, and prevent abnormal pressure in the system to ensure the safe operation of the system. The function of the chimney 10 is to provide a safe exhaust gas discharge channel for the entire organic solvent recovery system.

[0032] The primary adsorption tank 3 comprises a tank body 31, within which an activated carbon plate 32 is fixed. An internal reinforcement column 33 is disposed in the middle of the activated carbon plate 32, and a central electrode 34 is disposed in the middle of the internal reinforcement column 33. Interlayer electrodes 35 are disposed within the activated carbon plate 32. The tank body 31 is the main structure of the primary adsorption tank, providing a relatively closed space for the entire adsorption process. Its function is to accommodate other internal components, such as the activated carbon plate, internal reinforcement column, and electrodes, ensuring that the exhaust gas can fully contact the activated carbon plate within the tank body to adsorb the organic solvent, while preventing exhaust gas leakage and ensuring the effectiveness and safety of the adsorption process. The activated carbon plate 32 is a key component for adsorbing organic solvents. Activated carbon itself has a large specific surface area and a rich pore structure, which can adsorb organic solvent molecules in the exhaust gas on its surface and within its pores through physical adsorption. The internal reinforcement column 33 primarily serves to enhance the structural strength of the activated carbon plate.

[0033] The central electrode 34 is located within the internal reinforcement column in the middle of the activated carbon plate. When powered, it generates an electric field around the activated carbon plate. This electric field orients polar organic solvent molecules in the exhaust gas, making them more easily adsorbed on the activated carbon plate surface. It also induces polarization in non-polar molecules, enhancing their adsorption to the activated carbon plate. Furthermore, the electric field alters the charge distribution on the activated carbon plate surface, increasing adsorption sites and further improving the activated carbon plate's adsorption efficiency for organic solvents.

[0034] The interlayer electrode 35 is located within the activated carbon plate. Its main function is to cooperate with the central electrode to optimize the electric field distribution within the activated carbon plate. When the central electrode on the midline is energized to generate an electric field, the interlayer electrode becomes charged through electrostatic induction, thereby forming a more uniform and effective electric field within the activated carbon plate. This helps ensure that the electric field can penetrate all parts of the activated carbon plate, especially the pore area. This allows the organic solvent molecules to be subjected to a relatively uniform electric field regardless of their position within the activated carbon plate, achieving more efficient adsorption and further improving the adsorption effect of the entire adsorption tank on the organic solvent.

[0035] The activated carbon plate 32 is spiral-shaped, and the central electrode 34 is arranged on the central axis of the spiral activated carbon plate 32. The spiral activated carbon plate 32 and the central electrode 34 arranged on the central axis. The spiral design of the spiral activated carbon plate 32 means that when the exhaust gas flows through the activated carbon plate in the tank body, the flow path is no longer a simple straight line, but it meanders along the spiral channel. This greatly prolongs the contact time between the exhaust gas and the activated carbon plate, allowing the organic solvent molecules in the exhaust gas to have more opportunities to fully contact the surface and pores of the activated carbon plate, thereby increasing the probability of the organic solvent being adsorbed and enhancing the adsorption effect. In a limited tank space, the spiral structure can make more efficient use of space. Compared with traditional flat-plate or other simple-shaped activated carbon plates, more activated carbon materials can be arranged, further increasing the effective area available for adsorption, which helps to improve the adsorption capacity for organic solvents.

[0036] The central electrode 34 is arranged on the central axis of the spiral activated carbon plate 32, and the electric field generated after power is applied can radiate to the surroundings in a relatively uniform manner. Since the activated carbon plate is spirally wrapped around the electrode, this layout allows the electric field to penetrate the entire activated carbon plate more evenly, ensuring that each part can be affected by the electric field, so that the organic solvent molecules at different positions of the activated carbon plate can be subjected to a relatively consistent adsorption force enhancement effect, thereby improving the uniformity and overall efficiency of adsorption. The position of the central axis enables the electric field force to act effectively along the radial direction of the spiral activated carbon plate. For polar organic solvent molecules in the exhaust gas, they will move radially toward the surface of the activated carbon plate under the action of the electric field force, making them more easily adsorbed; for non-polar molecules, they can also be better affected by the polarization induced by the electric field and be adsorbed, giving full play to the strengthening effect of the electric field on the adsorption process.

[0037] The interlayer electrode 35 is a metal sheet, which is spirally embedded in the interior of the activated carbon plate 32. The interlayer electrode 35 is made of metal sheet, which can effectively conduct current and ensure that the expected electric field effect can be generated after power is applied or induced charging. At the same time, the relatively thin nature of the metal sheet makes it easier to bend it into a shape that matches the spiral activated carbon plate, making it convenient for embedded installation inside the activated carbon plate. The interlayer electrode 35, which is spirally embedded in the interior of the activated carbon plate, further optimizes the electric field distribution inside the activated carbon plate by cooperating with the central electrode 34 on the central axis. When the central electrode is energized to generate an electric field, the interlayer electrode will be charged due to electrostatic induction, forming a more complex and detailed electric field network inside the activated carbon plate. This electric field network can penetrate into each tiny pore area of the activated carbon plate, so that the adsorption process of organic solvent molecules inside the activated carbon plate is subject to more comprehensive and precise electric field regulation, further improving the adsorption efficiency.

[0038] Enhanced Adsorption: The electric field formed by the interlayer electrodes 35 works synergistically with the electric field of the central electrode 34 to provide a stronger driving force for the adsorption of organic solvent molecules in the exhaust gas, both polar and non-polar. For example, polar molecules are more firmly adsorbed to the activated carbon plate due to the combined effects of electric field forces from different directions. This synergistic electric field also enhances the likelihood of adsorption of non-polar molecules, thereby enhancing the entire activated carbon plate's adsorption capacity for organic solvents.

[0039] The working principle is divided into the following stages:

[0040] 1. Pretreatment Stage: When waste gas containing organic solvents enters pretreatment mechanism 2, the pretreatment process begins. First, impurities such as particulate matter and dust in the waste gas are filtered out. The temperature and humidity of the waste gas are also adjusted.

[0041] 2. Primary adsorption stage: The pre-treated exhaust gas enters the primary adsorption tank 3 through a pipeline. Inside the tank body 31 of the primary adsorption tank, the exhaust gas begins to come into contact with the spiral activated carbon plate 32. The activated carbon plate 32, with its large specific surface area and rich pore structure, physically adsorbs the organic solvent molecules in the exhaust gas. When the exhaust gas flows in the spiral channel, the organic solvent molecules are adsorbed in the pores of the activated carbon plate, thereby being separated from the exhaust gas. The exhaust gas is discharged from the pipeline into the chimney 10.

[0042] At the same time, the central electrode 34 located in the activated carbon plate 32 and the interlayer electrode 35 inside the activated carbon plate play a role. The central electrode 34 is connected to the reversible power supply 37 at the bottom of the tank 31, and the power supply is connected to the electrode through the wiring tube 36 symmetrically arranged at the bottom. After power is turned on, the central electrode generates an electric field, and the interlayer electrodes are charged through electrostatic induction, forming a complex and effective electric field environment inside the activated carbon plate. For polar organic solvent molecules in the exhaust gas, the electric field causes them to produce a directional arrangement, move toward the surface of the activated carbon plate and be adsorbed; for non-polar molecules, the electric field induces their polarization, enhancing the adsorption effect with the activated carbon plate. In addition, the electric field also changes the charge distribution on the surface of the activated carbon plate, increases the adsorption sites, and further improves the adsorption efficiency.

[0043] 3. Desorption (When the Activated Carbon Plate is Saturated): When the activated carbon plate 32 is saturated with adsorption, the desorption process begins. First, the steam channel is opened, and hot steam from the steam furnace 8 is passed into the primary adsorption tank 3. The hot steam has a relatively high temperature and energy. The heat carried by the hot steam can be transferred to the solvent molecules adsorbed on the activated carbon surface, allowing them to obtain sufficient energy to overcome the adsorption force between them and the activated carbon. The hot steam also increases the ambient temperature within the adsorption tank, increasing the activity of the solvent molecules. At higher temperatures, the thermal motion of the solvent molecules is more intense, and their mobility within the pores of the activated carbon is greatly enhanced. This facilitates the diffusion of solvent molecules from the surface and pore interior of the activated carbon to the pore openings, creating favorable conditions for subsequent desorption.

[0044] Then, the steam channel is closed and the pressure in the adsorption tank is reduced by the vacuum adsorption pump 9. The reduced pressure reduces the partial pressure of the solvent molecules in the gas phase, breaking the adsorption equilibrium between the solvent molecules on the activated carbon surface and the gas phase, and promoting the desorption of the solvent molecules from the activated carbon surface.

[0045] Simultaneously, reversible power supply 37 adjusts the direction or intensity of the electric field. Changing the direction of the electric field transforms the force originally used for adsorption into a force that pushes the solvent molecules off the activated carbon surface. Reducing the electric field intensity weakens the adsorption bonds between the solvent molecules and the activated carbon, making it easier for the solvent molecules to detach from the activated carbon surface. The synergistic effect of reduced pressure and the electric field change accelerates the desorption of solvent molecules from the activated carbon surface.

[0046] 4. Secondary adsorption stage (supplementary adsorption): When the solvent contains some low-polarity and small-molecule solvents, such as alkane solvents, cycloalkane solvents, etc., the outlet 3 of the primary adsorption tank is passed into the secondary adsorption tank 4. When the exhaust gas enters the secondary adsorption tank 4, it comes into contact with the separation membrane. Due to the differences in size, polarity, solubility, etc. between the special solvent molecules and other gas molecules, the separation membrane can allow these special solvent molecules to pass through preferentially or be intercepted, thereby achieving separation from other exhaust gas components.

[0047] 5. Condensation and supergravity separation stage: The attached organic solvent vapor enters the front condensation mechanism 5 through a pipe. In the condensation mechanism, the organic solvent vapor is cooled by a cooling medium such as cold water or refrigerant. The heat of the organic solvent vapor is taken away in a low-temperature environment, and a phase change occurs, from gas to liquid, achieving preliminary separation. Subsequently, the liquid mixture enters the supergravity separation mechanism 6. The supergravity separation mechanism uses the supergravity field generated by high-speed rotation to achieve a finer separation of different components in the liquid mixture under the action of centrifugal force. In a supergravity environment, impurities and residual water in the solvent will be separated into different areas due to differences in physical properties such as density, thereby effectively improving the purity of the recovered solvent.

[0048] 6. Solvent Recovery Stage: After being processed by the high-gravity separation mechanism 6, the high-purity organic solvent is transported to the solvent recovery tank 7 on the left for storage. The recovered organic solvent can be reused in industrial production and other links, achieving organic solvent recycling, reducing production costs and minimizing environmental impact.

[0049] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An organic solvent recovery system, characterized in that: The invention comprises a fixing frame (1), a pretreatment mechanism (2) is provided on the right side of the fixing frame (1), a first-level adsorption tank (3) is fixed on the lower end of the fixing frame (1), a second-level adsorption tank (4) is provided on the left side of the first-level adsorption tank (3), a condensation mechanism (5) is provided on the front part of the fixing frame (1), a rear end of the condensation mechanism (5) is connected to a supergravity separation mechanism (6), a left side of the supergravity separation mechanism (6) is connected to a solvent recovery tank (7), a steam furnace (8) is provided at the rear end of the fixing frame (1), and a vacuum adsorption pump (9) is provided on the upper end of the fixing frame (1); The primary adsorption tank (3) comprises a tank body (31), an activated carbon plate (32) is fixed inside the tank body (31), an internal reinforcement column (33) is provided in the middle of the activated carbon plate (32), a central electrode (34) is provided in the middle of the internal reinforcement column (33), and an interlayer electrode (35) is provided inside the activated carbon plate (32); The activated carbon plate (32) is spiral-shaped, and the central electrode (34) is arranged on the central axis of the spiral of the activated carbon plate (32); The interlayer electrode (35) is a metal sheet, spirally embedded inside the activated carbon plate (32); A reversible power supply (37) is provided at the bottom of the tank body (31), and the positive and negative electrodes of the reversible power supply (37) are connected to the two ends of the central electrode (34).

2. An organic solvent recovery system according to claim 1, characterized in that: A wiring tube (36) is symmetrically arranged at the bottom of the tank body (31).

3. An organic solvent recovery system according to claim 1, characterized in that: The number of the first-level adsorption tanks (3) is two.

4. An organic solvent recovery system according to claim 1, characterized in that: The vacuum adsorption pump (9) and the first-stage adsorption tank (3) are connected via a pipeline.

5. An organic solvent recovery system according to claim 1, characterized in that: The pretreatment mechanism (2) includes a filter and a cooler.

6. An organic solvent recovery system according to claim 1, characterized in that: A chimney (10) is provided at the rear end of the fixing frame (1).

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