Dipping and drying device and dipping and drying method

Abstract

The invention relates to the technical field of catalyst production, and provides a dipping and drying device and a dipping and drying method. The dipping and drying device comprises a closed reaction kettle, a liquid storage tank, a liquid supply pipeline, a drying device, a gas supply pipeline and a tail gas treatment device. The closed reaction kettle is provided with a liquid inlet, an air inlet, an air outlet, a carrier feed port and a sample discharge port, and the carrier feed port and the sample discharge port can be selectively opened or closed; the liquid storage tank is communicated with the liquid inlet through a liquid supply pipeline; the drying device is communicated with the air inlet through an air supply pipeline; the tail gas treatment device is communicated with the exhaust port. The dipping and drying device provided by the embodiment of the invention can be used for production of hydrophobic catalysts, in the using process of the dipping and drying device, the possibility that acid gas diffuses out of the dipping and drying device is greatly reduced, and the phenomenon that the acid gas diffuses out of the dipping and drying device can be reduced after the acid gas diffuses into the environment. And corrosion damage to metal parts of a dipping and drying device and other devices in the environment is avoided.

Description

Technical Field

[0001] The present application relates to the technical field of catalyst production, and in particular to an impregnation drying device and an impregnation drying method. Background Art

[0002] In the related art, the hydrophobic catalyst needs to go through the process of impregnation and drying during the manufacturing process. For example, Pt-SDB hydrophobic catalyst is a supported precious metal catalyst. During the manufacturing process, polystyrene-divinylbenzene (SDB) beads are used as carriers, chloroplatinic acid ethanol solution is used as a precursor, and it is prepared through processes such as impregnation, drying, and reduction. During the impregnation and drying process, chloroplatinic acid ethanol solution will volatilize a large amount of acidic gas, which will diffuse into the environment, causing corrosion damage to metal parts such as equipment and doors and windows in the environment, and operators will be in an environment with high acidic gas for a long time, which will also cause great harm to their health. Summary of the invention

[0003] In view of this, the embodiment of the present application hopes to provide an impregnation drying device and an impregnation drying method, which can reduce the adverse impact on the environment. The impregnation drying device is used for the manufacture of a hydrophobic catalyst, and the impregnation drying device comprises:

[0004] A closed reactor, having a liquid inlet, an air inlet, an exhaust port, a carrier feed port and a sample discharge port, wherein the carrier feed port is used to place the carrier, and the sample discharge port is used to take out the dry sample generated after the reaction, and the carrier feed port and the sample discharge port can be selectively opened or closed;

[0005] A liquid storage tank and a liquid supply pipeline, wherein the liquid storage tank is connected to the liquid inlet through the liquid supply pipeline and is used to provide an impregnation liquid to the closed reactor;

[0006] A drying device and an air supply pipeline, wherein the drying device is connected to the air inlet through the air supply pipeline and is used to provide dry gas to the closed reactor;

[0007] A tail gas treatment device is connected to the exhaust port and is used to treat the acid gas generated by the impregnation liquid in the closed reactor.

[0008] In some embodiments, the impregnation and drying device further comprises:

[0009] A liquid return channel and a switch valve, wherein the switch valve is arranged on the liquid return pipe; the closed reactor also has a liquid outlet, and the liquid storage tank is connected with the liquid outlet of the closed reactor through the liquid return pipe to receive the remaining impregnation liquid in the closed reactor.

[0010] In some embodiments, the impregnation and drying device further comprises:

[0011] The first filter is arranged on the liquid return pipe, located upstream or downstream of the switch valve, and is used for filtering the impregnation liquid discharged from the closed reactor.

[0012] In some embodiments, the impregnation and drying device further comprises:

[0013] A liquid supply pump is arranged on the liquid supply pipeline, so that the impregnation liquid can enter the liquid inlet pipeline from the liquid storage tank and then be transported to the closed reactor.

[0014] In some embodiments, the liquid supply pump is a gear pump, and a portion of the gear pump in contact with the immersion liquid has an anti-corrosion layer.

[0015] In some embodiments, the impregnation and drying device further comprises:

[0016] The second filter is arranged on the gas supply pipeline and is used for filtering the gas provided by the drying device.

[0017] In some embodiments, the impregnation and drying device further comprises:

[0018] A heating device is arranged on the gas supply pipeline and is used for heating the gas provided by the drying device.

[0019] In some embodiments, the impregnation and drying device further comprises:

[0020] The stirring device comprises a stirring part located in the closed reactor and a driving part located outside the closed reactor, wherein the driving part is drivingly connected to the stirring part, and the stirring part is used to mix the carrier and the impregnation liquid.

[0021] In some embodiments, the carrier is polystyrene-divinylbenzene, and the impregnating liquid is chloroplatinic acid ethanol solution.

[0022] The impregnation drying device provided in the embodiment of the present application can be used for the production of hydrophobic catalysts, for example, it can be used to realize the impregnation drying in the process of producing supported precious metal catalysts. During the use of the impregnation drying device, the possibility of acidic gas diffusion outside the impregnation drying device is greatly reduced, and the possibility of acidic gas diffusion into the environment causing corrosion damage to the metal parts of the impregnation drying device and other devices in the environment can be reduced.

[0023] The present application also provides an immersion drying method, which comprises:

[0024] placing the carrier into a closed reactor;

[0025] Providing the impregnation liquid into the closed reactor through a liquid supply tank;

[0026] stirring and mixing the carrier and the impregnation liquid;

[0027] Discharging the remaining impregnation liquid in the closed reactor;

[0028] Passing dry gas into the closed reactor for drying;

[0029] Discharging the acidic gas generated in the closed reactor to a tail gas treatment device;

[0030] A dried sample was obtained from the closed reactor.

[0031] In some embodiments, the step of discharging the remaining impregnation liquid in the closed reactor comprises:

[0032] The discharged impregnation liquid is transported to the liquid supply tank.

[0033] The impregnation and drying method provided in the embodiment of the present application can be used in the impregnation and drying device described above, and has the same beneficial effects as the impregnation and drying device described above. Impregnation and drying are both carried out in a closed reactor, and the generated acidic gas can be treated by a tail gas treatment device, which reduces the possibility of the acidic gas diffusing outside the impregnation and drying device, and can reduce the possibility of the acidic gas diffusing into the environment and causing corrosion damage to the metal parts of the impregnation and drying device and other devices in the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a structural schematic diagram of an impregnation and drying device in one embodiment of the present application;

[0035] Figure 2 Schematic diagram of the process of the dipping and drying method in one embodiment of the present application.

[0036] Description of Reference Numerals

[0037] 100, impregnation drying device; 10, closed reactor; 10a, liquid inlet; 10b, air inlet; 10c, exhaust port; 10d, carrier feed port; 10e, sample discharge port; 10f, liquid outlet; 20, liquid storage tank; 30, liquid supply pipeline; 40, drying device; 50, air supply pipeline; 70, liquid return channel; 80, switch valve; 90, first filter; 101, liquid supply pump; 102, second filter; 103, heating device; 104, stirring device; 1041, driving unit; 1042, stirring unit; 1421, stirring shaft; 1422, stirring paddle; 105, exhaust gas treatment device; 106, exhaust channel. DETAILED DESCRIPTION

[0038] The following is a further detailed description of the implementation of the present application in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present application but cannot be used to limit the scope of the present application.

[0039] It should be understood that these directional terms are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present application. The present application is further described in detail below in conjunction with the accompanying drawings and specific embodiments. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0040] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0041] In the description of this specification, the description with reference to the terms "some embodiments", "exemplarily", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine different embodiments or examples described in this application and the features of different embodiments or examples without contradiction.

[0042] In the related art, the hydrophobic catalyst needs to go through the process of impregnation and drying during the manufacturing process, and acidic gas will be released during the impregnation and drying process, which will cause harm to the operator and the environment. For example, the Pt-SDB hydrophobic catalyst uses polystyrene-divinylbenzene (SDB) beads as carriers and chloroplatinic acid ethanol solution as precursors during manufacturing, and is prepared through processes such as impregnation, drying, and reduction. During the impregnation and drying process, the precursor of the chloroplatinic acid ethanol solution will volatilize a large amount of acidic gas, which will diffuse into the environment, causing corrosion damage to metal parts such as equipment and doors and windows in the environment, and the operator will be in an environment with high acidic gas for a long time, which will also cause great harm to health.

[0043] In view of this, please refer to Figure 1An embodiment of the present application provides an impregnation drying device 100 for manufacturing a hydrophobic catalyst. The impregnation drying device 100 includes a closed reactor 10, a liquid storage tank 20, a liquid supply pipeline 30, a drying device 40, an air supply pipeline 50 and an exhaust gas treatment device 105. The closed reactor 10 has a liquid inlet 10a, an air inlet 10b, an exhaust port 10c, a carrier feed port 10d and a sample outlet 10e. The carrier feed port 10d is used to place the carrier, and the sample outlet 10e is used to take out the dry sample generated after the reaction. The carrier feed port 10d and the sample outlet 10e can be selectively opened or closed; the liquid storage tank 20 is connected to the liquid inlet 10a through the liquid supply pipe 30, and is used to provide the impregnation liquid to the closed reactor 10; the drying device 40 is connected to the air inlet 10b through the air supply pipe 50, and is used to provide dry gas to the closed reactor 10; the tail gas treatment device 105 is connected to the exhaust port 10c, and is used to treat the acidic gas generated by the impregnation liquid in the closed reactor 10.

[0044] The impregnation drying device 100 adopts the impregnation method for impregnation drying. Impregnation drying is a part of the process in manufacturing hydrophobic catalysts. The dry sample generated after impregnation drying needs to be processed into a hydrophobic catalyst through subsequent processes. The impregnation method is based on the principle that the active component is impregnated on a porous carrier in the form of a salt solution and penetrates into the inner surface to form a high-efficiency catalyst. Usually, the carrier is impregnated with a liquid containing an active substance. When the impregnation is balanced, the remaining liquid is discharged, and then the same drying, roasting, activation and other post-processing processes as the precipitation method are carried out.

[0045] The closed reactor 10 is used to provide an environment for the immersion drying process. Exemplarily, the closed reactor 10 includes an inner layer and an outer layer, wherein the inner layer is located inside the outer layer and forms a receiving cavity for placing materials for the reaction. The inner layer and the outer layer are both made of quartz material to reduce the possibility of being corroded by the immersion liquid. An interlayer is formed between the inner layer and the outer layer, and an insulating liquid is placed in the interlayer to maintain the temperature in the receiving cavity during the reaction process. Exemplarily, the immersion drying device 100 also includes a constant temperature device for providing a continuous flow of insulating liquid into the interlayer.

[0046] Carrier is one of the compositions of hydrophobic catalyst, can support active component, increase the strength of catalyst. Such as Pt-SDB hydrophobic catalyst, carrier is polystyrene-divinylbenzene, when manufacturing, polystyrene-divinylbenzene (SDB) pellet is carrier, and impregnation liquid is chloroplatinic acid ethanol solution. Pt-SDB hydrophobic catalyst is a kind of supported precious metal catalyst, is the key to realize liquid phase catalytic exchange reaction of water hydrogen isotope, is mainly used in heavy water upgrading, tritium wastewater volume reduction, heavy water production, ultra-light water production, organic hydrogenation and oxidation and other fields. The impregnation drying device provided in the present application embodiment can be used for Pt-SDB hydrophobic catalyst etc.

[0047] The liquid storage tank 20 is used to store and provide the impregnation liquid. Before the liquid storage tank 20 provides the impregnation liquid to the closed reactor 10, the impregnation liquid can be put into the liquid storage tank 20 for standby use. The two ends of the liquid supply pipe 30 are respectively connected to the liquid storage tank 20 and the closed reactor 10. Exemplarily, when there is a height difference between the liquid storage tank 20 and the liquid inlet 10a of the closed reactor 10, after the liquid inlet 10a is opened, the impregnation liquid can flow directly from the liquid storage tank 20 into the liquid inlet 10a by gravity. In other embodiments, the impregnation drying device 100 also includes a liquid supply pump 101, which is arranged on the liquid supply pipe 30, so that the impregnation liquid can enter the liquid inlet pipe 30 from the liquid storage tank 20 and then be transported to the closed reactor 10. When the liquid inlet 10a is opened, if the impregnation liquid cannot flow directly from the liquid storage tank 20 into the liquid inlet 10a by gravity, the liquid supply pump 101 can provide the power for the liquid flow, so that the impregnation liquid flows into the liquid inlet 10a from the liquid supply pipe 30. In some embodiments, the liquid supply pump 101 is a gear pump, and the gear pump and the part in contact with the impregnation liquid have an anti-corrosion layer. This prevents the liquid supply pump 101 from being corroded by the impregnation liquid and prolongs the service life of the liquid supply pump 101. For example, a polyetheretherketone coating can effectively reduce the possibility of being corroded by the impregnation liquid.

[0048] The drying device 40 is used to provide drying gas, and the two ends of the gas supply pipeline 50 are respectively connected to the drying device 40 and the closed reactor 10. Exemplarily, the drying device 40 can be a fan, and the airflow provided by the fan enters the closed reactor 10 through the gas supply pipeline 50. In order to improve the drying efficiency and the drying effect, the airflow can be heated before passing into the closed reactor 10. Exemplarily, the impregnation drying device 100 also includes a heating device 103, which is arranged on the gas supply pipeline 50 and is used to heat the gas provided by the drying device 40. The heating device 103 can be a gas heating belt, which can accurately control the gas temperature in the gas supply pipeline 50 so that the gas is maintained within the required temperature range during the transmission process.

[0049] When the carrier and the impregnation liquid are mixed, acidic gas will be generated, which will cause corrosion damage to the metal parts of the impregnation drying device 100 and other devices in the environment. The acidic gas will spread to the outside and cause damage to the environment and human body. By setting the tail gas treatment device 105 to be connected with the exhaust port 10c, for example, the tail gas treatment device 105 can be connected with the exhaust port 10c through the exhaust channel 106. The acidic gas generated when the carrier and the impregnation liquid are mixed can be collected and treated, reducing the possibility of the impregnation drying device 100 causing damage to the environment and human body. Exemplarily, the tail gas treatment device 105 is a tail gas treatment tank with an absorption liquid placed therein. The absorption liquid can be an alkaline solution, ammonia water, etc. Specifically, it can be adaptively set according to the composition of the acidic gas to absorb the acidic gas. The gas generated after absorbing the acidic gas can be directly discharged into the air. Both the impregnation and drying are completed in the closed reactor 10. Before the impregnation liquid is introduced into the closed reactor 10, the carrier feed port 10d is closed; before the dried sample needs to be taken out, the sample discharge port 10e is closed to prevent the acidic gas from flowing out of the impregnation drying device 100 from the carrier feed port 10d or the sample discharge port 10e.

[0050] The impregnation drying device 100 provided in the embodiment of the present application can be used for the production of hydrophobic catalysts, for example, can be used to implement impregnation drying in the process of producing supported precious metal catalysts. During the use of the impregnation drying device 100, the possibility of acidic gas diffusion outside the impregnation drying device 100 is greatly reduced, and the possibility of acidic gas diffusion into the environment and causing corrosion damage to the metal parts of the impregnation drying device 100 and other devices in the environment can be reduced.

[0051] For some examples, see Figure 1 The impregnation and drying device 100 also includes a liquid return channel 70 and a switch valve 80, and the switch valve 80 is arranged on the liquid return pipe; the closed reactor 10 also has a liquid outlet 10f, and the liquid storage tank 20 is connected to the liquid outlet 10f of the closed reactor 10 through the liquid return pipe, and is used to receive the remaining impregnation liquid in the closed reactor 10.

[0052] The two ends of the liquid return channel 70 are respectively connected to the liquid outlet 10f and the liquid storage tank 20, so that after the impregnation liquid and the carrier are mixed in the closed reactor 10, the remaining impregnation liquid can flow back to the liquid storage tank 20 for reuse, and there is no need to set up an additional device for recovering the impregnation liquid, which can reduce costs. The switch valve 80 can control whether the liquid flows. When the step of mixing the impregnation liquid and the carrier has not been completed, the switch valve 80 is closed to prevent the impregnation liquid from flowing out of the liquid outlet 10f and affecting the reaction effect; when the step of mixing the impregnation liquid and the carrier is completed, the switch valve 80 is opened to allow the impregnation liquid to flow out of the liquid outlet 10f into the liquid storage tank 20.

[0053] In some embodiments, the impregnation drying device 100 further includes a first filter 90 , which is disposed on the liquid return pipe and located upstream or downstream of the switch valve 80 , and is used to filter the impregnation liquid discharged from the closed reactor 10 .

[0054] The first filter 90 can remove other impurities that may be contained in the impregnation liquid discharged from the closed reactor 10, reducing the possibility that the impregnation drying effect will be affected when the impregnation liquid is mixed with the carrier again after entering the liquid storage tank 20. The first filter 90 can be located upstream or downstream of the switch valve 80. For example, see Figure 1 , the first filter 90 is located downstream of the switching valve 80 .

[0055] It can be understood that the upstream or downstream in the embodiments of the present application refers to the position that the gas or liquid passes first when moving is the upstream, and the position that the gas or liquid passes later is the downstream based on the flow direction.

[0056] In some embodiments, the impregnation and drying device 100 further includes a second filter 102 disposed on the gas supply pipeline 50 for filtering the gas provided by the drying device 40 .

[0057] The second filter 102 can remove impurities, particulate matter and other pollutants that may be contained in the gas provided by the drying device 40, so as to improve the purity and stability of the airflow provided by the drying device 40 to the closed reactor 10 and improve the effect of immersion drying.

[0058] The second filter 102 may be disposed at any location of the air supply pipeline 50. For example, see Figure 1 , the second filter 102 is arranged upstream of the heating device 103 .

[0059] In some embodiments, the impregnation drying device 100 further includes a stirring device 104 having a stirring portion 1042 located inside the closed reactor 10 and a driving portion 1041 located outside the closed reactor 10, wherein the driving portion 1041 is drivingly connected to the stirring portion 1042, and the stirring portion 1042 is used to mix the carrier and the impregnation liquid.

[0060] The mixing effect of the impregnation liquid and the carrier can be improved by the stirring device 104. The specific stirring method can be set according to the requirements of the impregnation drying. For example, the stirring device 104 can be used to stir the impregnation liquid while adding the impregnation liquid, and the stirring speed is adjusted to a speed at which the carrier can rotate. After the impregnation liquid is added, the stirring is continued to ensure that the impregnation liquid and the carrier are evenly mixed.

[0061] The internal stirring part 1042 can be controlled externally by the driving part 1041 to prevent leakage of acidic gas. The stirring part 1042 can be driven by manually operating the driving part 1041, or the driving part 1041 is configured as a motor, and the motor is connected to the stirring part 1042 for driving.

[0062] For example, the stirring part 1042 may include a stirring shaft 1421 and a stirring paddle 1422. A plurality of stirring paddles 1422 are arranged on the stirring shaft 1421 from top to bottom, so that the impregnation liquid and the carrier in the closed reactor 10 are fully stirred, thereby improving the stirring efficiency and the quality of the dried sample. Figure 2 , the dipping and drying method includes:

[0063] S1: placing the carrier into a closed reactor;

[0064] S2: providing the impregnation liquid to the closed reactor through the liquid supply tank;

[0065] S3: stirring and mixing the carrier and the impregnation liquid;

[0066] S4: discharging the remaining impregnation liquid in the closed reactor;

[0067] S5: introducing dry gas into the closed reactor for drying;

[0068] S6: discharging the acidic gas generated in the closed reactor to the tail gas treatment device 105;

[0069] S7: Get a dry sample from the closed reactor.

[0070] The above steps can be adaptively arranged according to the requirements of impregnation and drying. For example, in order to improve the mixing effect of the impregnation liquid and the carrier, the step of providing the impregnation liquid to the closed reactor 10 through the liquid supply tank and the step of stirring and mixing the carrier and the impregnation liquid can be performed simultaneously. After the step of providing the impregnation liquid to the closed reactor through the liquid supply tank is completed, the step of stirring and mixing the carrier and the impregnation liquid can continue until the mixture is uniform.

[0071] It is understandable that the step of discharging the remaining impregnation liquid after the carrier and the impregnation liquid are mixed needs to be performed after the step of stirring and mixing the carrier and the impregnation liquid, so as to avoid discharging the impregnation liquid before stirring it evenly, which will affect the impregnation effect.

[0072] Both impregnation and drying are carried out in the closed reactor 10, and the generated acidic gas can be treated by the tail gas treatment device 105, which reduces the possibility of the acidic gas diffusing outside the impregnation and drying device 100, and can reduce the possibility of the acidic gas diffusing into the environment and causing corrosion damage to the metal parts of the impregnation and drying device and other devices in the environment.

[0073] The immersion drying method provided in the embodiment of the present application is applicable to the immersion drying device in any embodiment of the present application.

[0074] In some embodiments, the step of discharging the remaining impregnation liquid in the closed reactor comprises:

[0075] The discharged impregnation liquid is conveyed to the liquid supply tank.

[0076] In this way, after the impregnation liquid and the carrier are mixed in the closed reactor 10, the remaining impregnation liquid can flow back to the liquid storage tank 20 for reuse, and there is no need to set up an additional device for recovering the impregnation liquid, which can reduce costs.

[0077] The following is an example of manufacturing a Pt-SDB hydrophobic catalyst in a specific embodiment. The closed reactor has a volume of 200 L. After opening the carrier feed port and adding 120 L of polystyrene-divinylbenzene beads, the carrier feed port is closed, and then the liquid supply pump is turned on to add 120 L of chloroplatinic acid ethanol solution into the closed reactor for equal volume impregnation. While adding the chloroplatinic acid ethanol solution, stirring is performed by a stirring device. After the chloroplatinic acid ethanol solution is added, stirring is continued, and the stirring and impregnation time is 2 hours in total.

[0078] Then, the switch valve is opened to discharge the remaining chloroplatinic acid ethanol solution in the closed reactor; the drying device and the heating device are turned on, and dry gas is introduced into the closed reactor for drying; the acid gas generated in the closed reactor is discharged to the tail gas treatment device 105; and a dry sample is obtained from the closed reactor. During drying, the temperature in the closed reactor is controlled to be 80°C, and the operation time of the drying device is 10 hours.

[0079] After the impregnation and drying process is completed, a reduction process is performed to obtain the Pt-SDB hydrophobic catalyst, which has good catalytic activity.

[0080] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An impregnation drying device for producing a hydrophobic catalyst, characterized in that: include: A closed reactor, having a liquid inlet, an air inlet, an exhaust port, a carrier feed port and a sample discharge port, wherein the carrier feed port is used to place the carrier, and the sample discharge port is used to take out the dry sample generated after the reaction, and the carrier feed port and the sample discharge port can be selectively opened or closed; A liquid storage tank and a liquid supply pipeline, wherein the liquid storage tank is connected to the liquid inlet through the liquid supply pipeline and is used to provide an impregnation liquid to the closed reactor; A drying device and an air supply pipeline, wherein the drying device is connected to the air inlet through the air supply pipeline and is used to provide dry gas to the closed reactor; A tail gas treatment device is connected to the exhaust port and is used to treat the acid gas generated by the impregnation liquid in the closed reactor.

2. The impregnation and drying device according to claim 1, characterized in that: The impregnation and drying device also includes: A liquid return channel and a switch valve, wherein the switch valve is arranged on the liquid return pipe; the closed reactor also has a liquid outlet, and the liquid storage tank is connected with the liquid outlet of the closed reactor through the liquid return pipe to receive the remaining impregnation liquid in the closed reactor.

3. The impregnation and drying device according to claim 2, characterized in that: The impregnation and drying device also includes: The first filter is arranged on the liquid return pipe, located upstream or downstream of the switch valve, and is used for filtering the impregnation liquid discharged from the closed reactor.

4. The impregnation and drying device according to claim 1, characterized in that: The impregnation and drying device also includes: A liquid supply pump is arranged on the liquid supply pipeline, so that the impregnation liquid can enter the liquid inlet pipeline from the liquid storage tank and then be transported to the closed reactor.

5. The impregnation and drying device according to claim 4, characterized in that: The liquid supply pump is a gear pump, and a portion of the gear pump in contact with the impregnation liquid has an anti-corrosion layer.

6. The impregnation and drying device according to claim 1, characterized in that: The impregnation and drying device also includes: The second filter is arranged on the gas supply pipeline and is used for filtering the gas provided by the drying device.

7. The impregnation and drying device according to claim 1, characterized in that: The impregnation and drying device also includes: A heating device is arranged on the gas supply pipeline and is used for heating the gas provided by the drying device.

8. The impregnation and drying device according to claim 1, characterized in that: The impregnation and drying device also includes: The stirring device comprises a stirring part located in the closed reactor and a driving part located outside the closed reactor, wherein the driving part is drivingly connected to the stirring part, and the stirring part is used to mix the carrier and the impregnation liquid.

9. The impregnation and drying device according to any one of claims 1 to 8, characterized in that: The carrier is polystyrene-divinylbenzene, and the impregnating liquid is chloroplatinic acid ethanol solution.

10. An immersion drying method, characterized in that: The dipping and drying method comprises: placing the carrier into a closed reactor; Providing the impregnation liquid into the closed reactor through a liquid supply tank; stirring and mixing the carrier and the impregnation liquid; Discharging the remaining impregnation liquid in the closed reactor; Passing dry gas into the closed reactor for drying; Discharging the acidic gas generated in the closed reactor to a tail gas treatment device; A dried sample was obtained from the closed reactor.

11. The immersion drying method according to claim 10, characterized in that: The step of discharging the remaining impregnation liquid in the closed reactor comprises: The discharged impregnation liquid is transported to the liquid supply tank.

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