An alcohol distillation system

Abstract

The utility model relates to the field of chemical alcohol recovery, especially a kind of alcohol distillation system, system includes first recycled alcohol tank, heat exchanger, distillation kettle, separation tower, second recycled alcohol tank and heavy component tank, first recycled alcohol tank is connected with heat exchanger, heat exchanger is connected with distillation kettle, the top of distillation kettle is connected with separation tower, the bottom of distillation kettle is connected with heavy component tank, the bottom of separation tower is connected with heat exchanger, heat exchanger is connected with second recycled alcohol tank, when the main impurity of alcohol in the copolyester production process is high-boiling heavy component, and the purity requirement to recycled alcohol is not extremely high, this alcohol distillation system can meet the purity requirement, while reducing equipment and energy consumption cost.

Description

Technical Field

[0001] This utility model relates to the field of chemical alcohol recovery, and in particular to an alcohol distillation system. Background Technology

[0002] In the copolyester production process, alcohols are widely used in various reaction stages and are indispensable key raw materials. For the sake of energy conservation, emission reduction, cost reduction and efficiency improvement, most companies have built alcohol recovery systems, which recover and reuse incompletely reacted alcohols. For example, in the esterification and polycondensation reaction stages of copolyester production, mixed alcohols containing alcohols such as ethylene glycol are generated. If they are not recovered and reused, it will not only cause waste of resources, but also require high waste liquid treatment costs.

[0003] Currently, some conventional alcohol recovery processes have significant shortcomings. For example, recovering crude ethylene glycol through a single process tower cannot effectively separate heavy component impurities generated during degradation, leading to the accumulation of impurities within the system and ultimately resulting in substandard purity of the refined ethylene glycol. However, if the main impurities recovered during copolyester production are high-boiling-point heavy components and the purity requirement for the alcohol is not extremely high, it is also necessary to avoid "over-processing" other non-major impurities, thereby increasing the corresponding costs.

[0004] CN116239446B discloses a separation and recovery process for mixed alcohols by-products of a polyester system, comprising: (1) mixed alcohols by-products from the polyester system enter a light component removal tower, the first light component is collected from the top of the tower, and the first heavy component from the bottom of the tower enters an evaporation tower; (2) the second heavy component is collected from the bottom of the evaporation tower, and the second light component is collected from the top of the tower and enters an ethylene glycol refining tower; (3) ethylene glycol product is collected from the side stream of the ethylene glycol refining tower, the third light component is collected from the top of the tower, and the third heavy component from the bottom of the tower enters a diethylene glycol refining tower; (4) diethylene glycol product is collected from the side stream of the diethylene glycol refining tower, the fourth light component is collected from the top of the tower, and the fourth heavy component is collected from the bottom of the tower. That is, the process involves multiple steps and complex material flow control. However, when the purity requirement of the alcohol is not extremely high, it is not necessary to pursue the complete separation of non-major impurities in each tower. The production requirements can be met by simply adjusting the output. It is necessary to avoid increasing equipment and energy consumption to deeply process non-major impurities, thereby increasing costs.

[0005] Therefore, if the main impurities of the alcohol recovered during the copolyester production process are high-boiling-point heavy components, and the purity requirement of the recovered alcohol is not extremely high, how to design an alcohol recovery device that can meet the purity requirements while reducing equipment and energy costs is an urgent technical problem to be solved. Summary of the Invention

[0006] To solve the above-mentioned technical problems, this utility model provides an alcohol distillation system, which includes a first reuse alcohol tank, a heat exchanger, a distillation kettle, a separation tower, a second reuse alcohol tank, and a heavy component tank. When the main impurities of the alcohol recovered during the copolyester production process are high-boiling-point heavy components, and the purity requirement of the recovered alcohol is not extremely high, this alcohol distillation system can meet the purity requirements while reducing equipment and energy costs.

[0007] This invention provides an alcohol distillation system, comprising a first reuse alcohol tank, a heat exchanger, a distillation kettle, a separation column, a second reuse alcohol tank, and a heavy component tank. The first reuse alcohol tank is connected to the heat exchanger, the heat exchanger is connected to the distillation kettle, the top of the distillation kettle is connected to the separation column, the bottom of the distillation kettle is connected to the heavy component tank, the bottom of the separation column is connected to the heat exchanger, and the heat exchanger is connected to the second reuse alcohol tank. The first recycled alcohol tank is used to store recycled alcohol containing a large amount of heavy component impurities, and the recycled alcohol continues to enter the heat exchanger. The heat exchanger is used to perform heat exchange treatment on the recycled alcohol and the distilled alcohol at the bottom of the separation tower. The recycled alcohol obtained after heat exchange treatment continues to enter the distillation kettle, and the distilled alcohol obtained after heat exchange treatment continues to enter the second recycled alcohol tank. The distillation vessel is used to distill the heat exchanged alcohol. The distilled alcohol obtained at the top after distillation continues to enter the separation tower, and the heavy component impurities obtained at the bottom enter the heavy component tank. The separation column is used to perform distillation on the distilled alcohol, and the distilled alcohol obtained at the bottom of the column after distillation continues to enter the heat exchanger. The second reuse alcohol tank is used to store the heat-exchange distilled alcohol; The recombinant tank is used to store the recombinant impurities.

[0008] Furthermore, both the first and second reuse alcohol tanks include an inlet, an outlet, and a level gauge. The inlet is located at the top or side of the tank, and the outlet is located at the bottom of the tank.

[0009] Furthermore, the level gauge includes a glass tube level gauge, a magnetic level gauge, or a radar level gauge.

[0010] Furthermore, the inner wall of the tank has an anti-corrosion coating, which includes an epoxy resin coating, a polyurethane coating, or a fluorocarbon coating.

[0011] Furthermore, a breathing valve is provided on the top of the tank, which includes a gravity-type breathing valve, a spring-type breathing valve, or a pilot-operated breathing valve.

[0012] Furthermore, the heat exchanger includes a tube bundle and a tube sheet.

[0013] Furthermore, the tube bundle includes heat transfer tubes, the heat transfer tubes being made of copper or stainless steel.

[0014] Furthermore, the tube sheet is provided with holes, and the heat transfer tube is located inside the holes.

[0015] Furthermore, the distillation vessel includes a heating device, which includes a heating coil and / or a jacket.

[0016] Furthermore, the distillation vessel also includes a stirring device, which includes a stirring paddle, the shape of which includes a paddle or a turbine.

[0017] Furthermore, the distillation vessel is provided with a gas phase outlet at the top and a liquid phase outlet at the bottom.

[0018] Furthermore, the distillation vessel also includes a safety valve and a pressure gauge.

[0019] Furthermore, the separation tower is provided with a tower plate along the height direction, and the tower plate is provided with holes.

[0020] Furthermore, the separation tower is also equipped with a downcomer.

[0021] Furthermore, the separation tower is filled with packing material, which includes Raschig rings, Pall rings, or step rings.

[0022] Furthermore, the recombinant tank is provided with an inlet at the top and an outlet at the bottom.

[0023] Furthermore, the inner wall of the recombinant tank has an anti-corrosion coating, which includes an epoxy resin coating, a polyurethane coating, or a fluorocarbon coating.

[0024] Beneficial effects of this utility model 1. This utility model adopts a combination of distillation kettle and separation tower to perform secondary purification of recycled alcohol. For recycled alcohol whose main impurities are high-boiling-point heavy components, in addition to the extremely high purity requirements of recycled alcohol, this alcohol distillation system can meet the requirement of 90-95% purity, and at the same time, it does not require complex tower system combination, thereby reducing equipment costs.

[0025] 2. In this utility model, the temperature of the recycled alcohol containing more heavy component impurities in the first recycled alcohol tank is relatively low, while the temperature of the distilled alcohol at the bottom of the separation tower is relatively high. After heat exchange through the heat exchanger, the temperature of the recycled alcohol increases, thereby reducing the heating energy consumption after the recycled alcohol enters the distillation kettle, thus reducing energy consumption costs. Attached Figure Description

[0026] Figure 1This is a schematic diagram of the alcohol distillation system of this utility model. 1-First reuse alcohol tank; 2-Heat exchanger; 3-Distillation kettle; 4-Separation tower; 5-Second reuse alcohol tank; 6-Recombinant component tank; 7-Tube bundle; 8-Tube sheet; 9-Heating coil; 10-Jacket; 11-Agitator; 12-Tray. Detailed Implementation

[0027] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort should fall within the scope of protection of the present invention.

[0028] It should be noted that the term "comprising" in the specification, claims, and accompanying drawings of this utility model is intended to cover a non-exclusive inclusion. In this utility model, the terms "upper," "lower," "front," "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily used to better describe this utility model and its embodiments and are not intended to limit the indicated components to having a specific orientation. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0029] This invention provides an alcohol distillation system, comprising a first reuse alcohol tank 1, a heat exchanger 2, a distillation kettle 3, a separation column 4, a second reuse alcohol tank 5, and a heavy component tank 6. The first reuse alcohol tank 1 is connected to the heat exchanger 2, the heat exchanger 2 is connected to the distillation kettle 3, the top of the distillation kettle 3 is connected to the separation column 4, the bottom of the distillation kettle 3 is connected to the heavy component tank 6, the bottom of the separation column 4 is connected to the heat exchanger 2, and the heat exchanger 2 is connected to the second reuse alcohol tank 5. The first recycled alcohol tank 1 is used to store recycled alcohol containing a large amount of heavy component impurities, and the recycled alcohol continues to enter the heat exchanger 2. Heat exchanger 2 is used to exchange heat between the recycled alcohol and the distilled alcohol at the bottom of the separation tower 4. The recycled alcohol obtained after heat exchange treatment continues to enter the distillation kettle 3, and the distilled alcohol obtained after heat exchange treatment continues to enter the second recycled alcohol tank 5. Distillation vessel 3 is used to distill the heat exchanged alcohol. The distilled alcohol obtained from the top after distillation continues to enter the separation tower 4, and the heavy component impurities obtained from the bottom enter the heavy component tank 6. Separation tower 4 is used to rectify distilled alcohol. The distilled alcohol obtained at the bottom of the tower after rectification continues to enter heat exchanger 2. The second alcohol tank 5 is used to store the heat-exchange distilled alcohol; Recombination tank 6 is used to store heavy component impurities.

[0030] Figure 1 This is a schematic diagram of the alcohol distillation system of this utility model. The system includes a first recycled alcohol tank 1, a heat exchanger 2, a distillation kettle 3, a separation column 4, a second recycled alcohol tank 5, and a heavy component tank 6. The first recycled alcohol tank 1 is connected to the heat exchanger 2, the heat exchanger 2 is connected to the distillation kettle 3, the top of the distillation kettle 3 is connected to the separation column 4, the bottom of the distillation kettle 3 is connected to the heavy component tank 6, the bottom of the separation column 4 is connected to the heat exchanger 2, and the heat exchanger 2 is connected to the second recycled alcohol tank 5. The first recycled alcohol tank 1 is used to store recycled alcohol containing a large amount of heavy component impurities, and the recycled alcohol continues to enter the heat exchanger 2. The heat exchanger 2 is used to separate the recycled alcohol from the separation column 4. The bottom of the distilled alcohol undergoes heat exchange treatment, and the heat-recycled alcohol obtained after heat exchange treatment continues to enter the distillation kettle 3. The heat-recycled distilled alcohol obtained after heat exchange treatment continues to enter the second reuse alcohol tank 5. The distillation kettle 3 is used to distill the heat-recycled alcohol. The distilled alcohol obtained at the top after distillation treatment continues to enter the separation column 4, and the heavy component impurities obtained at the bottom enter the heavy component tank 6. The separation column 4 is used to rectify the distilled alcohol. The distilled alcohol obtained at the bottom after rectification treatment continues to enter the heat exchanger 2. The second reuse alcohol tank 5 is used to store the heat-recycled distilled alcohol. The heavy component tank 6 is used to store the heavy component impurities. By employing a combination of distillation vessel 3 and separation tower 4, recycled alcohol is purified a second time. For recycled alcohol whose main impurities are high-boiling-point heavy components, in addition to the extremely high purity requirements, this alcohol distillation system can meet the purity requirement of 90-95% without the need for complex tower combinations, thereby reducing equipment costs. Furthermore, the recycled alcohol containing more heavy component impurities in the first recycled alcohol tank 1 has a lower temperature, while the purified alcohol at the bottom of the separation tower 4 has a higher temperature. After heat exchange through heat exchanger 2, the temperature of the recycled alcohol increases, thereby reducing the heating energy consumption after the recycled alcohol enters the distillation vessel 3, thus reducing energy costs.

[0031] Optionally, both the first reuse alcohol tank 1 and the second reuse alcohol tank 5 include an inlet, an outlet, and a level gauge. The inlet is located at the top or side of the tank, and the outlet is located at the bottom of the tank.

[0032] Both the first reuse alcohol tank 1 and the second reuse alcohol tank 5 are vertical storage tanks. This structure has the advantages of small footprint and large storage capacity. The tank is equipped with an inlet, an outlet and a level gauge. The inlet is located at the top or side of the tank and the outlet is located at the bottom of the tank. This ensures that the material flows smoothly into and out of the tank. The level gauge is used to monitor the liquid level in the tank, so as to understand the storage status of the material in the tank and to replenish or discharge the material in a timely manner.

[0033] Optionally, the level gauge may include a glass tube level gauge, a magnetic level gauge, or a radar level gauge.

[0034] Liquid level gauges include glass tube level gauges, magnetic level gauges, and radar level gauges. Among them, glass tube level gauges are simple in structure and inexpensive, but they are easily broken and not suitable for high-pressure or corrosive environments. Magnetic level gauges have advantages such as corrosion resistance, high temperature resistance, and pressure resistance, and are suitable for most industrial scenarios. Radar level gauges have advantages such as high measurement accuracy and are not affected by the density and viscosity of the medium, and are suitable for scenarios with high measurement accuracy requirements.

[0035] Optionally, the inner wall of the tank has an anti-corrosion coating, including an epoxy resin coating, a polyurethane coating, or a fluorocarbon coating.

[0036] Alcohols are also corrosive, and long-term storage may damage the tank. Therefore, the inner wall of the tank has an anti-corrosion coating, which includes epoxy resin coating, polyurethane coating or fluorocarbon coating. Among them, epoxy resin has good corrosion resistance and adhesion, and is suitable for the storage of most alcohols; polyurethane has good wear resistance and weather resistance, and is suitable for tanks stored outdoors; fluorocarbon coating has excellent corrosion resistance and weather resistance, and is suitable for highly corrosive environments.

[0037] Optionally, a breather valve is provided on the top of the tank, which may include a gravity-type breather valve, a spring-type breather valve, or a pilot-operated breather valve.

[0038] The top of the tank is equipped with a breather valve, which is an automatic pressure regulating device. It can automatically perform air intake or exhaust operations according to changes in the tank pressure. Breather valves include gravity-type breather valves, spring-type breather valves, or pilot-operated breather valves. Among them, the gravity-type breather valve has a simple structure and relies on the gravity of the valve disc to control the opening and closing of the breather valve; the spring-type breather valve relies on the elastic force of the spring to control the opening and closing of the breather valve; the pilot-operated breather valve is a high-precision breather valve, suitable for occasions with high pressure control requirements.

[0039] Optionally, the heat exchanger 2 includes a tube bundle 7 and a tube sheet 8.

[0040] Heat exchanger 2 adopts a shell-and-tube structure, including tube bundle 7 and tube sheet 8. Optionally, the tube bundle 7 includes heat transfer tubes, which may be made of copper or stainless steel.

[0041] The tube bundle 7 includes multiple heat transfer tubes, which are the main channels for heat transfer. The heat transfer tubes are usually made of materials with good thermal conductivity and corrosion resistance, including copper or stainless steel. Copper has good thermal conductivity, but it is expensive and may corrode in some alcohol solutions; stainless steel has good corrosion resistance and strength, and is suitable for most alcohol distillation systems.

[0042] Optionally, the tube sheet 8 is provided with holes, and the heat transfer tubes are located inside the holes.

[0043] The tube sheet 8 has multiple holes, and the heat transfer tubes are located inside the holes. The size and position of these holes are precisely machined to ensure that the heat transfer tubes can be accurately installed on the tube sheet 8 and to ensure the sealing between the tube sheet 8 and the heat transfer tubes.

[0044] Optionally, the distillation vessel 3 includes a heating device, which includes a heating coil 9 and / or a jacket 10.

[0045] The distillation vessel 3 is equipped with a heating device, which includes a heating coil 9 and a jacket 10. The function of the heating device is to provide the necessary heat for the distillation process, causing the alcohol solution inside the vessel to reach its boiling point and generate alcohol vapor. The heating coil 9 is typically immersed in the alcohol solution, transferring heat to the solution through heat conduction. The heating coil 9 is usually made of stainless steel or titanium alloy, materials with good corrosion resistance and thermal conductivity. The jacket 10 is an outer layer of the vessel body, through which the heating medium flows, transferring heat to the alcohol solution inside through the vessel wall. The jacket 10 is typically made of carbon steel or stainless steel, and the jacket can be used to circulate the distillation medium. Heating media include steam, hot water, or heat transfer oil.

[0046] Optionally, the distillation vessel 3 also includes a stirring device, which includes a stirring paddle 11, the shape of which may be paddle-type or turbine-type.

[0047] The vessel is also equipped with a stirring device. The stirring device uses the rotation of the stirring paddle 11 to ensure uniform mixing of the materials within the vessel. The purpose of stirring is to ensure uniform heating of the materials and avoid localized overheating or uneven temperature distribution. This is crucial for the stable operation of the distillation process, as uneven temperature can lead to alcohol decomposition or other side reactions, affecting product quality. The stirring paddle 11 comes in various shapes, including paddle-type and turbine-type. Paddle-type stirring paddles 11 have a simple structure and are suitable for low-viscosity materials; turbine-type stirring paddles 11 have higher stirring intensity and are suitable for high-viscosity materials or applications requiring vigorous mixing.

[0048] Optionally, the distillation vessel 3 is provided with a gas phase outlet at the top and a liquid phase outlet at the bottom.

[0049] The top of the distillation vessel 3 is equipped with a gas phase outlet for discharging the alcohol vapor generated during distillation. This alcohol vapor is then sent to the separation tower 4 for further separation and purification. The bottom is equipped with a liquid phase outlet for discharging the heavy component impurities generated during distillation. These impurities are finally collected in the heavy component tank 6 for subsequent processing.

[0050] Optionally, the distillation vessel 3 also includes a safety valve and a pressure gauge.

[0051] The distillation vessel 3 also includes a safety valve and a pressure gauge. The safety valve is used to prevent excessive pressure inside the distillation vessel 3, thereby protecting the equipment. The pressure gauge is used to monitor the pressure inside the distillation vessel 3 to ensure that the distillation process is carried out at a suitable pressure.

[0052] Optionally, the separation tower 4 has a tower plate 12 along the height direction inside, and the tower plate 12 has holes.

[0053] The separation tower 4 has multiple layers of trays 12 along the height direction. The trays 12 are key components for gas-liquid contact and mass transfer. The surface of the trays has holes. The shape and arrangement of these holes allow the rising gas phase and the falling liquid phase to fully contact each other on the trays 12. When the alcohol vapor generated by the distillation kettle 3 enters from the side of the separation tower 4, it undergoes mass transfer with the liquid phase on the trays 12 during its ascent.

[0054] Optionally, a downcomer is also provided inside the separation tower 4.

[0055] The downcomer inside the tower provides a channel for the flow of liquid phase between the trays 12. The design of the downcomer ensures that the liquid phase can flow smoothly from the upper tray 12 to the lower tray 12, avoiding short-circuiting and back mixing of the liquid, thereby ensuring countercurrent contact between the gas and liquid phases in the tower and creating conditions for efficient mass transfer.

[0056] Optionally, the separation tower 4 is filled with packing material, including Raschig rings, Pall rings, or step rings.

[0057] Separation column 4 contains packing material with a large specific surface area, providing a broad mass transfer interface for the gas and liquid phases. The packing includes Raschig rings, Pall rings, or stepped rings. Raschig rings are simple in structure and easy to manufacture, but their mass transfer efficiency is relatively low. Pall rings are an improvement on Raschig rings, offering higher mass transfer efficiency. Stepped rings have an even larger specific surface area and porosity, better adapting to high-load separation processes. Furthermore, the packing method also affects the separation effect. There are generally two methods: random stacking and orderly arrangement. Random stacking involves randomly piling the packing material inside the column; this method is simple to operate, but the uniformity of the packing layer is poor, potentially leading to uneven gas-liquid distribution. Orderly arrangement involves arranging the packing material in a specific pattern inside the column, ensuring the uniformity and stability of the packing layer and improving mass transfer efficiency, but the packing process is more complex.

[0058] Optionally, the recombining tank 6 is provided with an inlet at the top and an outlet at the bottom.

[0059] The heavy component tank 6 has an inlet at the top to receive heavy component impurities discharged from the bottom of the distillation vessel 3, and an outlet at the bottom to discharge heavy component impurities.

[0060] Optionally, the inner wall of the recombinant tank 6 has an anti-corrosion coating, including an epoxy resin coating, a polyurethane coating, or a fluorocarbon coating.

[0061] The heavy component impurities may be highly corrosive. Therefore, the inner wall of the heavy component tank 6 has an anti-corrosion coating, which is the same as that of the first reuse alcohol tank 1 and the second reuse alcohol tank 5, including epoxy resin coating, polyurethane coating or fluorocarbon coating.

[0062] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model in any other way. Any modifications or equivalent changes made based on the technical essence of the present utility model shall still fall within the scope of protection claimed by the present utility model.

Claims

1. An alcohol distillation system, characterized in that, The system includes a first reuse alcohol tank (1), a heat exchanger (2), a distillation kettle (3), a separation column (4), a second reuse alcohol tank (5), and a heavy component tank (6). The first reuse alcohol tank (1) is connected to the heat exchanger (2), the heat exchanger (2) is connected to the distillation kettle (3), the top of the distillation kettle (3) is connected to the separation column (4), the bottom of the distillation kettle (3) is connected to the heavy component tank (6), the bottom of the separation column (4) is connected to the heat exchanger (2), and the heat exchanger (2) is connected to the second reuse alcohol tank (5). The first recycled alcohol tank (1) is used to store recycled alcohol containing a large number of heavy component impurities, and the recycled alcohol continues to enter the heat exchanger (2). The heat exchanger (2) is used to perform heat exchange treatment on the recycled alcohol and the distilled alcohol at the bottom of the separation tower (4). The recycled alcohol obtained after heat exchange treatment continues to enter the distillation kettle (3), and the distilled alcohol obtained after heat exchange treatment continues to enter the second recycled alcohol tank (5). The distillation vessel (3) is used to distill the heat exchanged alcohol. The distilled alcohol obtained at the top after distillation continues to enter the separation tower (4), and the heavy component impurities obtained at the bottom enter the heavy component tank (6). The separation tower (4) is used to perform distillation on the distilled alcohol, and the distilled alcohol obtained at the bottom of the tower after distillation continues to enter the heat exchanger (2); The second reuse alcohol tank (5) is used to store the heat-exchange distilled alcohol; The recombinant tank (6) is used to store the recombinant impurities.

2. The system according to claim 1, characterized in that, Both the first reuse alcohol tank (1) and the second reuse alcohol tank (5) include an inlet, an outlet and a level gauge. The inlet is located at the top or side of the tank body and the outlet is located at the bottom of the tank body.

3. The system according to claim 1, characterized in that, The heat exchanger (2) includes a tube bundle (7) and a tube sheet (8).

4. The system according to claim 3, characterized in that, The tube bundle (7) includes heat transfer tubes, the material of which includes copper or stainless steel.

5. The system according to claim 1, characterized in that, The distillation vessel (3) includes a heating device, which includes a heating coil (9) and / or a jacket (10).

6. The system according to claim 1, characterized in that, The distillation vessel (3) also includes a stirring device, which includes a stirring paddle (11) and the shape of the stirring paddle (11) includes a paddle type or a turbine type.

7. The system according to claim 1, characterized in that, The distillation vessel (3) has a gas phase outlet at the top and a liquid phase outlet at the bottom.

8. The system according to claim 1, characterized in that, The separation tower (4) has a tower plate (12) along the height direction, and the tower plate (12) has holes.

9. The system according to claim 1, characterized in that, The separation tower (4) is filled with packing material, which includes Raschig rings, Pall rings or step rings.

10. The system according to claim 1, characterized in that, The inner wall of the recombinant tank (6) has an anti-corrosion coating, which includes an epoxy resin coating, a polyurethane coating, or a fluorocarbon coating.

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