Preparation system and tail gas treatment equipment

Abstract

The utility model relates to a preparation system and tail gas treatment equipment. The preparation system comprises a reaction unit, a cooling separation unit and a tail gas treatment unit, the reaction unit is used for enabling the raw materials to react to obtain a mixture containing a product; the cooling and separating unit is used for cooling the product-containing mixture and then carrying out gas-liquid separation to obtain a gas mixture and a product-containing liquid mixture; and the tail gas treatment unit is used for purifying the gas mixture. According to the preparation system provided by the embodiment of the utility model, the content of nitrogen-containing compounds in exhausted tail gas can be greatly reduced, so that the tail gas reaches the emission standard.

Description

Technical Field

[0001] This invention relates to a preparation system, and more particularly to a piperidine preparation system capable of treating the generated exhaust gas. Background Technology

[0002] Piperidine (molecular formula (CH2)5NH, CAS number 110-89-4), also known as hexahydropyridine, is a cyclic aliphatic secondary amine belonging to the category of moderately strong bases. At room temperature, it is a colorless, fuming liquid with a pungent odor similar to ammonia and pepper. As a very important fine chemical intermediate, piperidine has a wide range of applications, including pharmaceutical synthesis, agrochemical synthesis, and rubber product synthesis. In recent years, with the expansion of piperidine's application fields, especially the emergence of numerous new drugs containing piperidine structures, the demand for high-purity piperidine has greatly increased, indicating its promising application prospects.

[0003] There have been some reports on the method of preparing piperidine by catalytic deammoniation using pentanediamine as raw material under the action of a catalyst. However, the generation of piperidine also produces a lot of tail gas, which contains substances such as hydrogen, ammonia, pentanediamine, piperidine, and water. If it is directly emitted, it will not meet the environmental protection requirements. Utility Model Content

[0004] To overcome at least one of the defects of the prior art, in a first aspect, one embodiment of the present invention provides a preparation system, including a reaction unit, a cooling and separation unit, and a tail gas treatment unit; the reaction unit is used to react raw materials to obtain a mixture containing products; the cooling and separation unit is used to cool the mixture containing products, and then perform gas-liquid separation to obtain a gas mixture and a liquid mixture containing products; the tail gas treatment unit is used to purify the gas mixture.

[0005] The exhaust gas treatment unit includes one or more first adsorption devices and one or more second adsorption devices. The first adsorption devices are used to dry the gas mixture, and the second adsorption devices are used to remove one or more nitrogen-containing compounds contained in the gas mixture.

[0006] According to one embodiment of the present invention, a molecular sieve is provided in the first adsorption device; and / or,

[0007] Activated carbon is provided in the second adsorption device; and / or,

[0008] The first adsorption device is connected to both the cooling separation unit and the second adsorption device; and / or,

[0009] The preparation system includes a gas storage device, which is connected to the cooling separation unit and the tail gas treatment unit, respectively. The gas storage device is used to store the gas mixture discharged from the cooling separation unit and can discharge the gas mixture into the tail gas treatment unit.

[0010] According to one embodiment of the present invention, the exhaust gas treatment unit further includes one or more third adsorption devices, the third adsorption device being disposed between the first adsorption device and the second adsorption device, the third adsorption device being used to remove pentanediamine and piperidine from the nitrogen-containing compound, and the second adsorption device being used to remove ammonia from the nitrogen-containing compound.

[0011] According to one embodiment of the present invention, the exhaust gas treatment unit further includes an ammonia absorption device, which is connected to the second adsorption device and is used to absorb the ammonia desorbed from the second adsorption device; and / or

[0012] Resin is provided in the third adsorption device.

[0013] According to one embodiment of the present invention, the preparation system includes a tail gas storage device for storing gas discharged from the tail gas treatment unit; and / or,

[0014] The reaction unit includes a reaction apparatus for reacting the raw materials; and / or,

[0015] The preparation system includes a purification unit for purifying the liquid mixture containing the product.

[0016] According to one embodiment of the present invention, the exhaust gas storage device is also connected to the reaction unit; and / or,

[0017] The reaction apparatus includes one or more of a fixed-bed reactor, a fluidized-bed reactor, a slurry-bed reactor, and a microreactor; and / or,

[0018] The reaction unit further includes a preheating device for preheating the raw materials; and / or,

[0019] The purification unit includes a distillation apparatus; and / or,

[0020] The purification unit is connected to the cooling and separation unit.

[0021] According to one embodiment of the present invention, the preheating device includes a coil preheater and / or a shell-and-tube heat exchanger; and / or,

[0022] The preheating device is connected to the exhaust gas storage device and / or the exhaust gas treatment unit.

[0023] Secondly, one embodiment of the present invention provides an exhaust gas treatment device, including one or more first adsorption devices and one or more second adsorption devices, wherein the first adsorption devices are used to dry the exhaust gas, and the second adsorption devices are used to remove one or more nitrogen-containing compounds contained in the exhaust gas.

[0024] According to one embodiment of the present invention, a molecular sieve is provided in the first adsorption device; and / or,

[0025] Activated carbon is provided in the second adsorption device; and / or,

[0026] The exhaust gas treatment equipment further includes one or more third adsorption devices, which are disposed between the first adsorption device and the second adsorption device. The third adsorption device is used to remove pentanediamine and piperidine from the nitrogen-containing compounds, and the second adsorption device is used to remove ammonia from the nitrogen-containing compounds.

[0027] According to one embodiment of the present invention, the exhaust gas treatment equipment further includes an ammonia absorption device, which is connected to the second adsorption device and is used to absorb the ammonia desorbed from the second adsorption device; and / or

[0028] Resin is provided in the third adsorption device.

[0029] The preparation system of one embodiment of this utility model can significantly reduce the content of nitrogen-containing compounds (such as ammonia, pentanediamine, and piperidine) in the exhaust gas by setting an exhaust gas treatment unit, so that it meets the emission standards. Attached Figure Description

[0030] The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this invention.

[0031] in:

[0032] Figure 1 This is a schematic diagram of the preparation system according to one embodiment of the present invention;

[0033] Figure 2 This is a schematic diagram of the preparation system according to another embodiment of the present invention;

[0034] The annotations in the attached figures are explained as follows:

[0035] 11. Preheating device; 12. Reaction device; 20. Cooling device; 30. Separation device; 40. Purification device; 51. First adsorption device; 52. Second adsorption device; 53. Third adsorption device; 54. Ammonia absorption device; 60. Tail gas detection device; 71. Gas storage device; 72. Tail gas storage device; 81. First valve; 82. Second valve; 83. Third valve; 84. Fourth valve; 85. Fifth valve. Detailed Implementation

[0036] Typical embodiments embodying the features and advantages of this utility model will be described in detail in the following description. It should be understood that this utility model can have various variations in different embodiments, all of which do not depart from the scope of this utility model, and the description herein is for illustrative purposes only and not intended to limit this utility model.

[0037] Reference Figure 1 As shown, one embodiment of this utility model provides a preparation system, including a reaction unit, a cooling and separation unit, and a tail gas treatment unit; wherein, the reaction unit is used to react the raw materials to obtain a mixture containing the product; the cooling and separation unit is used to cool the mixture containing the product, and then perform gas-liquid separation to obtain a gas mixture and a liquid mixture containing the product; the tail gas treatment unit is used to purify the gas mixture.

[0038] The exhaust gas treatment unit includes one or more first adsorption devices 51 and one or more second adsorption devices 52. The first adsorption devices 51 are used to dry the gas mixture, and the second adsorption devices 52 are used to remove one, two, or more nitrogen-containing compounds contained in the gas mixture. These nitrogen-containing compounds can be one, two, or more of raw materials, products, or by-products.

[0039] The preparation system of one embodiment of this utility model can be used for the preparation of piperidine, that is, it can be a piperidine preparation system. The structure and application of the preparation system will be further described below using the preparation of piperidine as an example. The raw material includes pentanediamine, the product is piperidine, and the byproduct includes ammonia; the mixture containing the product is a mixture containing piperidine, and the liquid mixture containing the product is a liquid mixture containing piperidine. Nitrogen-containing compounds may include ammonia, pentanediamine, and piperidine.

[0040] In one embodiment, the reaction unit includes a reaction apparatus 12 for reacting pentanediamine in a hydrogen atmosphere to produce piperidine. Further, the reaction apparatus 12 may be selected from one or more of a fixed-bed reactor, a fluidized-bed reactor, a slurry-bed reactor, and a microreactor.

[0041] In one embodiment, since the reaction temperature of pentanediamine catalytic reaction in a hydrogen atmosphere is relatively high (100-300°C), the reaction raw materials (pentanediamine and hydrogen) can be preheated to the target temperature or set temperature before being introduced into the reaction device 12 for reaction. The preheating treatment can be carried out in the preheating device 11 of the reaction unit, which is connected to the reaction device 12.

[0042] In one embodiment, the preheating device 11 is connected to the reaction device 12 and is located upstream of the reaction device 12.

[0043] In one embodiment, the preheating device 11 may be a coil preheater and / or a shell-and-tube heat exchanger.

[0044] In one embodiment, a cooling separation unit is connected to the reaction unit and is used to cool the high-temperature piperidine-containing mixture discharged from the reaction unit. This cooling process condenses most of the gaseous pentanediamine and piperidine contained in the piperidine-containing mixture into a liquid. The cooling separation unit includes a cooling device 20, which is connected to the reaction device 12 of the reaction unit. Further, the cooling device 20 can be a heat exchanger.

[0045] In one embodiment, the cooling separation unit further includes a separation device 30 connected to the cooling device 20. The mixture discharged from the cooling device 20 is a gas-liquid mixture with a temperature of 40-50°C. The mixture is introduced into the separation device 30, where it is automatically separated into a gas mixture (tail gas) and a liquid mixture containing piperidine (i.e., crude piperidine). The gas mixture can be discharged from the top of the separation device 30, and the liquid mixture can be temporarily stored in the separation device 30 or discharged from the bottom of the separation device 30.

[0046] In one embodiment, the separation device 30 is provided with a feed inlet, a gas outlet, and a liquid outlet. The feed inlet can be connected to the cooling device 20 for introducing a gas-liquid mixture into the separation device 30. The gas outlet is used for discharging the separated gas mixture, and the liquid outlet is used for discharging the separated liquid mixture. Further, the gas outlet can be located at the top of the separation device 30, and the liquid outlet can be located at the bottom of the separation device 30.

[0047] In one embodiment, the separation device 30 can be an existing storage tank, with a feed pipe installed inside the tank. The feed pipe is connected to the cooling device 20 through a feed inlet. Furthermore, the port of the feed pipe is positioned as close as possible to the bottom of the storage tank to facilitate automatic gas-liquid separation.

[0048] In one embodiment, the crude piperidine product is mainly composed of piperidine, and also contains small amounts of pentanediamine, ammonia monohydrate (a product of ammonia gas dissolved in water), and water.

[0049] In one embodiment, the preparation system includes a purification unit for purifying crude piperidine to obtain a purified piperidine product. Further, the purification unit may be connected to a cooling separation unit.

[0050] In one embodiment, the purification unit includes a purification device 40, which may be connected to the separation device 30, for example, to the liquid outlet of the separation device 30. Further, the purification device 40 may be a distillation device. Even further, the distillation device may be a distillation column, an evaporating kettle, a falling film evaporator, an evaporation tower, a scraped evaporator, or a molecular distillation device.

[0051] In one embodiment, the gas mixture discharged from the separation device 30 is mainly hydrogen, and also includes 5 to 30 vol% ammonia, 2 to 5 vol% piperidine, 2 to 5 vol% pentanediamine and 2 to 5 vol% water vapor.

[0052] In one embodiment, the exhaust gas treatment unit is connected to the cooling separation unit to perform purification treatment on the gas mixture discharged from the cooling separation unit, including removing water, ammonia, piperidine, and pentanediamine.

[0053] In one implementation, reference Figure 1 As shown, the exhaust gas treatment unit includes one or more first adsorption devices 51 and one or more second adsorption devices 52. The first adsorption device 51 removes moisture (or water vapor) from the gas mixture, and the second adsorption device 52 removes one or more nitrogen-containing compounds from the gas mixture. The nitrogen-containing compounds may include ammonia, piperidine, and pentanediamine.

[0054] In one embodiment, the first adsorption device 51 is connected to both the separation device 30 and the second adsorption device 52. Furthermore, the first adsorption device 51 is provided with a molecular sieve (a water-absorbing molecular sieve) for water removal, and the second adsorption device 52 is provided with activated carbon.

[0055] In one embodiment, the first adsorption device 51 may be a molecular sieve adsorption device, and the second adsorption device 52 may be an activated carbon adsorption device.

[0056] In another implementation, refer to Figure 2 As shown, the exhaust gas treatment unit includes one or more first adsorption devices 51, one or more third adsorption devices 53, and one or more second adsorption devices 52. The third adsorption device 53 is disposed between the first adsorption device 51 and the second adsorption device 52. The first adsorption device 51 is used to remove moisture from the gas mixture, the third adsorption device 53 is used to remove pentanediamine and piperidine from nitrogen-containing compounds, and the second adsorption device 52 is used to remove ammonia from nitrogen-containing compounds.

[0057] In one embodiment, a resin, such as a macroporous adsorption resin (styrene-divinylphenyl resin), is provided in the third adsorption device 53, and the third adsorption device 53 can be a resin adsorption device.

[0058] In one embodiment, the exhaust gas treatment unit further includes an ammonia absorption device 54, which is connected to a second adsorption device 52 and is used to absorb ammonia desorbed from the second adsorption device 52. Specifically, the nitrogen-containing compounds pentamethylenediamine and piperidine are first absorbed by a third adsorption device 53, then ammonia is absorbed separately by the second adsorption device 52. The ammonia absorbed by the second adsorption device 52 is then desorbed, and the desorbed ammonia is absorbed by the ammonia absorption device 54, thus enabling the recovery and reuse of ammonia.

[0059] In one embodiment, a heating element, such as a heating jacket, is provided in the second adsorption device 52. The activated carbon adsorbed with ammonia gas can be heated by the heating element to desorb the ammonia gas.

[0060] In one embodiment, the second adsorption device 52 includes a tail gas inlet, a tail gas outlet, a desorption gas inlet, and a desorption gas outlet. Gas discharged from the third adsorption device 53 enters the second adsorption device 52 through the tail gas inlet for ammonia removal, and the treated gas exits the second adsorption device 52 through the tail gas outlet. After the adsorption treatment in the second adsorption device 52 is completed, ammonia desorption can be performed. The activated carbon in the second adsorption device 52 is heated by a heating element, and nitrogen gas is introduced into the second adsorption device 52 through the desorption gas inlet. The desorbed ammonia gas, carried by the nitrogen gas, exits the second adsorption device 52 through the desorption gas outlet and then enters the ammonia absorption device 54.

[0061] In one embodiment, the ammonia absorption device 54 includes an inlet, an outlet, and a liquid inlet. A mixture of nitrogen and ammonia gas discharged from the desorption gas outlet of the second adsorption device 52 enters the ammonia absorption device 54 through the inlet. The absorbent enters the ammonia absorption device 54 through the liquid inlet to absorb the ammonia gas in the mixture. Remaining nitrogen gas exits the ammonia absorption device 54 through the outlet and can be returned to the second adsorption device 52 for reuse. Further, the absorbent can be water, ammonia solution, or an acid solution, and ammonia solution or a salt (e.g., ammonium sulfate) can be obtained after absorbing ammonia gas.

[0062] In one embodiment, the ammonia absorption device 54 can be an ammonia absorption tower, which is provided with an adsorption packing layer. The packing in the adsorption packing layer can be bulk packing or structured packing. The bulk packing can be one of Pall rings, Raschig rings, I-rings, step rings, flower rings and ball rings.

[0063] In one embodiment, the exhaust gas treatment unit includes a plurality of second adsorption devices 52, which can be used for switching between ammonia adsorption and desorption to achieve continuous exhaust gas treatment.

[0064] In one embodiment, an exhaust gas detection device 60 is provided outside the exhaust gas treatment unit to detect the gas discharged from the exhaust gas treatment unit and determine whether it meets the emission standards. Further, the exhaust gas detection device 60 can be installed on the exhaust pipe of the exhaust gas treatment unit and connected to the second adsorption device 52.

[0065] In one embodiment, the preparation system includes a gas storage device 71, which is connected to a cooling separation unit and a tail gas treatment unit. When it is necessary to replace the adsorbent (activated carbon or molecular sieve) in the adsorption device of the tail gas treatment unit, the passage between the cooling separation unit and the tail gas treatment unit can be cut off, and the gas mixture discharged from the cooling separation unit can be passed into the gas storage device 71. After the adsorbent replacement is completed, the gas mixture in the gas storage device 71 is passed into the tail gas treatment unit for treatment, and the passage between the cooling separation unit and the tail gas treatment unit is reconnected.

[0066] In one embodiment, the gas storage device 71 can be connected to the separation device 30 and the first adsorption device 51 respectively. Further, a first valve 81 is provided between the separation device 30 and the first adsorption device 51 to control the connection and disconnection of the passage between the separation device 30 and the first adsorption device 51. A second valve 82 is provided between the separation device 30 and the gas storage device 71 to control the connection and disconnection of the passage between the separation device 30 and the gas storage device 71.

[0067] In one embodiment, the exhaust gas from the tail gas treatment unit that meets emission standards can be directly discharged, temporarily collected and stored, or directly fed into the reaction unit for reuse as needed (or the collected and stored gas can be fed into the reaction unit for reuse), thereby saving hydrogen consumption and reducing production costs. Further, the preparation system includes a tail gas storage device 72 for collecting and storing the emitted tail gas. Even further, the tail gas storage device 72 is connected to the reaction unit, and the collected tail gas can be reintroduced into the reaction unit for reuse as needed.

[0068] In one embodiment, a third valve 83 is provided between the exhaust gas treatment unit and the exhaust gas storage device 72 to control the connection and disconnection of the passage between the exhaust gas treatment unit and the exhaust gas storage device 72. A fourth valve 84 is provided between the exhaust gas treatment unit and the reaction unit to control the connection and disconnection of the passage between the exhaust gas treatment unit and the reaction unit.

[0069] In one embodiment, the exhaust gas storage device 72 is connected to the preheating device 11 of the reaction unit, and the third valve 83 is disposed between the exhaust gas storage device 72 and the fourth valve 84.

[0070] In one embodiment, the exhaust gas treatment unit is connected to the preheating device 11 of the reaction unit, and the fourth valve 84 is disposed between the exhaust gas treatment unit and the preheating device 11.

[0071] In one embodiment, a fifth valve 85 is provided on the exhaust pipe of the exhaust gas treatment unit for controlling the connection and disconnection between the exhaust gas treatment unit and the outside (or atmosphere).

[0072] In one embodiment, the first valve 81, the second valve 82, the third valve 83, the fourth valve 84, and the fifth valve 85 can all be self-control valves commonly used in the art.

[0073] Reference Figure 1 , 2 As shown, one embodiment of the present invention provides an exhaust gas treatment device, including one or more first adsorption devices 51 and one or more second adsorption devices 52. The first adsorption devices 51 are used to dry the exhaust gas (e.g., a gas mixture discharged from a cooling separation unit), and the second adsorption devices 52 are used to remove one or more nitrogen-containing compounds from the exhaust gas. The nitrogen-containing compounds may include ammonia, pentanediamine, and piperidine.

[0074] In one embodiment, the exhaust gas treatment equipment includes the same apparatus and method of use as the aforementioned exhaust gas treatment unit.

[0075] The preparation system of one embodiment of this utility model can significantly reduce the content of nitrogen-containing compounds (such as ammonia, pentanediamine, piperidine) and water in the exhaust gas through the exhaust gas treatment unit (or exhaust gas treatment equipment). The treated exhaust gas can be directly discharged into the atmosphere or directly recycled into the reaction unit, which can save hydrogen consumption and reduce production costs.

[0076] The preparation system of one embodiment of this utility model, through the treatment of the exhaust gas treatment unit (or exhaust gas treatment equipment), can keep the content of products (e.g., piperidine) in the exhaust gas below 0.2 vol%, the content of raw materials (e.g., pentanediamine) below 0.2 vol%, the content of by-products (e.g., ammonia) below 0.5 vol%, and the content of reaction gas (e.g., hydrogen) above 99 vol%, thereby meeting the emission standards.

[0077] The following description, in conjunction with embodiments and accompanying drawings, further illustrates the use of the preparation system according to one embodiment of the present invention. The content of each component in the exhaust gas is determined by gas chromatography.

[0078] Example 1

[0079] S1: First, adjust the preheating temperature of the preheating device 11 to 170-190°C, then introduce pentanediamine and hydrogen into the preheating device 11 for preheating. Then, introduce the preheated mixture of pentanediamine and hydrogen into the reaction device 12 and react at 170-190°C to obtain a high-temperature piperidine-containing mixture.

[0080] S2: The high-temperature piperidine-containing mixture is passed into the cooling device 20 and cooled at 45°C. Most of the gaseous pentanediamine and piperidine in the mixture are condensed into liquid. The cooled mixture is then passed into the separation device 30, where it is automatically separated into a gaseous mixture (unpurified tail gas) and a piperidine-containing liquid mixture. The gaseous mixture is discharged from the top of the separation device 30, and the piperidine-containing liquid mixture is discharged from the bottom of the separation device 30. The liquid mixture discharged from the bottom of the separation device 30 is then passed into the purification device 40 for purification to obtain purified piperidine product.

[0081] S3: The gas mixture is sequentially passed through a first adsorption device 51 equipped with a molecular sieve (4A molecular sieve) and a second adsorption device 52 equipped with activated carbon (columnar activated carbon purchased from Ningxia Zhulin Activated Carbon Co., Ltd.). The purified tail gas is discharged from the second adsorption device 52. The component content of the unpurified tail gas and the purified tail gas are detected respectively, and the results are shown in Table 1.

[0082] Table 1. Component content of unpurified / purified exhaust gas in Example 1

[0083]

[0084] As shown in Table 1, the gas mixture directly discharged from the separation device 30 in Example 1, i.e., the unpurified tail gas, contains a significant amount of ammonia, pentanediamine, piperidine, and other components. Its composition does not meet emission standards and cannot be directly discharged into the atmosphere. However, after the unpurified tail gas is treated by the tail gas treatment unit, the content of ammonia, pentanediamine, and piperidine in the gas can be significantly reduced, making the gas meet emission standards and allowing for direct discharge or reuse.

[0085] Unless otherwise specified, the terms used in this utility model have the meanings commonly understood by those skilled in the art.

[0086] The embodiments described in this utility model are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. Those skilled in the art can make various other substitutions, changes and improvements within the scope of this utility model. Therefore, this utility model is not limited to the above embodiments, but is only defined by the claims.

Claims

1. A preparation system, characterized in that, include: A reaction unit is used to react raw materials to obtain a mixture containing products; A cooling separation unit is used to cool the mixture containing the product, followed by gas-liquid separation to obtain a gas mixture and a liquid mixture containing the product; and An exhaust gas treatment unit is used to purify the gas mixture; The exhaust gas treatment unit includes one or more first adsorption devices and one or more second adsorption devices. The first adsorption devices are used to dry the gas mixture, and the second adsorption devices are used to remove one or more nitrogen-containing compounds contained in the gas mixture.

2. The preparation system according to claim 1, characterized in that, A molecular sieve is provided in the first adsorption device; and / or, Activated carbon is provided in the second adsorption device; and / or, The first adsorption device is connected to both the cooling separation unit and the second adsorption device; and / or, The preparation system includes a gas storage device, which is connected to the cooling separation unit and the tail gas treatment unit, respectively. The gas storage device is used to store the gas mixture discharged from the cooling separation unit and can discharge the gas mixture into the tail gas treatment unit.

3. The preparation system according to claim 1, characterized in that, The exhaust gas treatment unit further includes one or more third adsorption devices, which are disposed between the first adsorption device and the second adsorption device. The third adsorption device is used to remove pentanediamine and piperidine from the nitrogen-containing compound, and the second adsorption device is used to remove ammonia from the nitrogen-containing compound.

4. The preparation system according to claim 3, characterized in that, The exhaust gas treatment unit further includes an ammonia absorption device, which is connected to the second adsorption device and is used to absorb the ammonia desorbed from the second adsorption device; and / or Resin is provided in the third adsorption device.

5. The preparation system according to claim 1, characterized in that, Includes an exhaust gas storage device for storing gases discharged from the exhaust gas treatment unit; and / or, The reaction unit includes a reaction apparatus for reacting the raw materials; and / or, The preparation system includes a purification unit for purifying the liquid mixture containing the product.

6. The preparation system according to claim 5, characterized in that, The exhaust gas storage device is also connected to the reaction unit; and / or, The reaction apparatus includes one or more of a fixed-bed reactor, a fluidized-bed reactor, a slurry-bed reactor, and a microreactor; and / or, The reaction unit further includes a preheating device for preheating the raw materials; and / or, The purification unit includes a distillation apparatus; and / or, The purification unit is connected to the cooling and separation unit.

7. The preparation system according to claim 6, characterized in that, The preheating device includes a coil preheater and / or a shell-and-tube heat exchanger; and / or, The preheating device is connected to the exhaust gas storage device and / or the exhaust gas treatment unit.

8. A tail gas treatment device, characterized in that, It includes one or more first adsorption devices and one or more second adsorption devices, wherein the first adsorption devices are used to dry the exhaust gas and the second adsorption devices are used to remove one or more nitrogen-containing compounds contained in the exhaust gas.

9. The exhaust gas treatment equipment according to claim 8, characterized in that, A molecular sieve is provided in the first adsorption device; and / or, Activated carbon is provided in the second adsorption device; and / or, The exhaust gas treatment equipment further includes one or more third adsorption devices, which are disposed between the first adsorption device and the second adsorption device. The third adsorption device is used to remove pentanediamine and piperidine from the nitrogen-containing compounds, and the second adsorption device is used to remove ammonia from the nitrogen-containing compounds.

10. The exhaust gas treatment equipment according to claim 9, characterized in that, It also includes an ammonia absorption device, which is connected to the second adsorption device and is used to absorb ammonia desorbed from the second adsorption device; and / or, Resin is provided in the third adsorption device.

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