A device and method for testing the performance of a carbon molecular sieve

Abstract

The application relates to a carbon molecular sieve performance testing device and method, and belongs to the technical field of carbon molecular sieve performance testing. A carbon molecular sieve performance testing method comprises the following steps: (1) filling the carbon molecular sieve to be tested in an adsorption column, and arranging an air inlet and an air outlet on the adsorption column; (2) introducing high-purity nitrogen into the adsorption column from the air inlet, and monitoring the nitrogen concentration of the air outlet; (3) when the nitrogen concentration of the air outlet is consistent with the concentration of the high-purity nitrogen, stopping the introduction of the high-purity nitrogen; (4) introducing air into the adsorption column from the air inlet for a preset time, monitoring the nitrogen concentration of the air outlet, and determining the performance of the carbon molecular sieve based on the air introduction time and the nitrogen concentration of the air outlet. The performance of the carbon molecular sieve can be tested with high efficiency, high accuracy and high repeatability.

Description

Technical Field

[0001] This application relates to the field of carbon molecular sieve performance testing technology, and in particular to a testing device and method for carbon molecular sieve performance. Background Technology

[0002] In existing technologies, the main performance indicators of carbon molecular sieves in pressure swing adsorption (PSA) processes, namely nitrogen production rate and nitrogen concentration, are usually tested using the following methods: testing is conducted using a small PSA device. This method involves nitrogen-oxygen separation based on the different diffusion rates of nitrogen and oxygen within the micropores of the carbon molecular sieve (smaller diameter oxygen molecules diffuse faster than larger diameter nitrogen molecules). The nitrogen concentration gradually increases during device operation.

[0003] However, it usually takes more than half an hour to increase the nitrogen concentration from 79% to 99%, and the higher the concentration, the longer the time. It may take more than an hour to increase the nitrogen concentration to 99.99%. Using this method to evaluate the performance of carbon molecular sieves is inefficient. In addition, each test is conducted by directly introducing air, and there may be undisplaced oxygen in the carbon molecular sieve, so the performance of the carbon molecular sieves tested is inaccurate and has low repeatability. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present application aims to provide a testing device and method for carbon molecular sieve performance, thereby overcoming the problems of low testing efficiency, inaccurate detection, and poor repeatability in carbon molecular sieve performance testing.

[0005] In a first aspect, embodiments of this application provide a method for testing the performance of carbon molecular sieves, the method comprising the following steps:

[0006] (1) The carbon molecular sieve to be tested is filled into the adsorption column, which is equipped with an inlet and an outlet.

[0007] (2) Introduce high-purity nitrogen into the adsorption column through the inlet and monitor the nitrogen concentration at the outlet.

[0008] (3) When the nitrogen concentration at the outlet is the same as the high-purity nitrogen concentration, stop the flow of high-purity nitrogen.

[0009] (4) Air is introduced into the adsorption column for a preset time from the inlet, and the nitrogen concentration at the outlet is monitored. Based on the air introduction time and the nitrogen concentration at the outlet, the performance of the carbon molecular sieve is determined.

[0010] High-purity nitrogen is first introduced into the carbon molecular sieve adsorption column until the nitrogen concentration at the column outlet matches the high-purity nitrogen concentration. Then, the nitrogen introduction is stopped. At this point, the adsorbed oxygen in the carbon molecular sieve is completely replaced, allowing for relatively accurate and repeatable testing of the carbon molecular sieve's performance. Alternatively, the adsorption column can be filled with high-purity nitrogen first, followed by air introduction to achieve nitrogen-oxygen separation. Monitoring the nitrogen concentration at the column outlet allows for the determination of the carbon molecular sieve's performance based on the aeration time and outlet nitrogen concentration. This eliminates the need to increase the nitrogen concentration from 79% to 99%, or even 99.99%, to determine the carbon molecular sieve's performance, resulting in higher efficiency.

[0011] In some embodiments of this application, the ventilation time includes the total time for introducing high-purity nitrogen and air.

[0012] In some embodiments of this application, the concentration of high-purity nitrogen is 99.999%.

[0013] In some embodiments of this application, in step (4), the nitrogen concentration at the outlet of the air supply is 79.000%, and the air supply is stopped. When the nitrogen concentration at the outlet of the adsorption column reaches 79.000%, it means that the carbon molecular sieve in the adsorption column has reached its adsorption limit and can no longer adsorb oxygen.

[0014] In some embodiments of this application, the performance of the carbon molecular sieve is determined based on the ventilation time and the nitrogen concentration at the outlet, including:

[0015] By plotting the ventilation time on the x-axis and the nitrogen concentration at the outlet on the y-axis, the adsorption performance curve of the carbon molecular sieve is obtained. Based on the adsorption performance curve, the performance of the carbon molecular sieve is determined.

[0016] Based on the adsorption performance curve, the nitrogen production rate and nitrogen production time of carbon molecular sieve can be seen intuitively. The higher the nitrogen production rate and the longer the nitrogen production time, the better the performance of the carbon molecular sieve.

[0017] In some embodiments of this application, the performance of multiple carbon molecular sieves is tested according to steps (1)-(4) to obtain multiple adsorption performance curves. The nitrogen concentration at the outlet is compared at the same preset time point in the multiple adsorption performance curves to compare the performance of multiple carbon molecular sieves. The preset time point is one of the preset time points after air is introduced.

[0018] Multiple adsorption performance curves can be obtained when testing multiple carbon molecular sieves. The nitrogen concentration at the outlet of multiple carbon molecular sieves at the same preset time point can be directly compared. At the same preset time point, the higher the nitrogen concentration at the outlet, the better the performance of the carbon molecular sieve. The method is simple and efficient.

[0019] In some embodiments of this application, before introducing high-purity nitrogen, the method further includes: determining the gas flow rate at the outlet.

[0020] In some embodiments of this application, the method for determining the gas flow rate at the outlet includes: calculating it based on the working flow rate per unit mass of the carbon molecular sieve and the total mass of the carbon molecular sieve packed in the adsorption column.

[0021] The gas flow rate at the outlet is predetermined and set accordingly to maintain a suitable working pressure for the carbon molecular sieve within the adsorption column, thereby ensuring the optimal adsorption capacity of the carbon molecular sieve.

[0022] In some embodiments of this application, the diameter of the adsorption column is 12.7-50.8 mm, and the height is 300-1000 mm. Setting an appropriate test quantity for the carbon molecular sieve allows for both accurate testing and determination of its performance, as well as rapid and efficient testing.

[0023] Secondly, embodiments of this application provide a testing device for the performance of carbon molecular sieves. The testing device is used in the testing method provided in the first aspect, and the testing device includes:

[0024] An adsorption column, with an air inlet at one end and an air outlet at the other end;

[0025] The air inlet pipe is connected to the air inlet and is used to introduce high-purity nitrogen or air into the adsorption column, respectively.

[0026] The gas outlet pipeline is connected to the gas outlet and is equipped with a nitrogen concentration monitor to test the nitrogen concentration at the gas outlet.

[0027] First, high-purity nitrogen is introduced into the adsorption column through the inlet pipe. When the nitrogen concentration monitor detects that the nitrogen concentration in the outlet pipe reaches 99.999%, it indicates that the oxygen adsorbed in the carbon molecular sieve has been completely replaced by nitrogen, and the introduction of high-purity nitrogen is stopped. Then, air is introduced into the adsorption column through the inlet pipe. When the nitrogen concentration monitor detects that the nitrogen concentration in the outlet pipe reaches 79.000%, it indicates that the carbon molecular sieve has reached its adsorption limit, and the introduction of air is stopped.

[0028] In some embodiments of this application, the air intake pipeline includes an air intake manifold, a nitrogen pipeline, and an air pipeline. One end of the air intake manifold is connected to the air inlet, and the other end is connected to the nitrogen pipeline and the air pipeline, respectively. A nitrogen inlet valve is provided on the nitrogen pipeline; and / or an air inlet valve is provided on the air pipeline; and / or an outlet valve is provided on the outlet pipeline.

[0029] The nitrogen pipeline is used to introduce high-purity nitrogen, and the nitrogen inlet valve is used to control the opening and closing of the nitrogen pipeline; the air pipeline is used to introduce air, and the air inlet valve is used to control the opening and closing of the air pipeline; the exhaust valve is used to control the opening and closing of the exhaust pipeline.

[0030] In some embodiments of this application, a flow meter is provided on the outlet pipe, and a pressure valve is provided on the inlet main pipe.

[0031] The pressure valve controls the pressure of the gas entering the inlet pipe, ensuring that the gas entering the adsorption column has a certain pressure, allowing the carbon molecular sieve to adsorb under pressure. At the same time, the flow meter controls the gas flow rate in the outlet pipe, so that the adsorption column is always maintained at a suitable working pressure for the carbon molecular sieve, thereby ensuring the optimal adsorption capacity of the carbon molecular sieve during operation. Attached Figure Description

[0032] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 A schematic diagram of a testing apparatus for the performance of carbon molecular sieves provided in an embodiment of this application.

[0034] Figure 2 The adsorption performance curve of the carbon molecular sieve provided in the embodiments of this application.

[0035] Icons: 1-Adsorption column; 2-Inlet manifold; 3-Outlet pipe; 31-Outlet valve; 4-Nitrogen pipe; 41-Nitrogen inlet valve; 5-Air pipe; 51-Air inlet valve; 6-Nitrogen concentration monitor; 7-Flow meter; 8-Paperless recorder. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply. Reagents or instruments whose manufacturers are not specified are all conventional products that can be purchased commercially.

[0037] In existing technologies, the main performance indicators of carbon molecular sieves in pressure swing adsorption (PSA) processes, namely nitrogen production rate and nitrogen concentration, are usually detected by small-scale PSA devices. Nitrogen and oxygen are separated based on the different diffusion rates of nitrogen and oxygen in the micropores of carbon molecular sieves (smaller diameter oxygen molecules diffuse faster than larger diameter nitrogen molecules). During the operation of the device, the nitrogen concentration gradually increases.

[0038] However, it usually takes more than half an hour to increase the nitrogen concentration from 79% to 99%, and the higher the concentration, the longer the time. It may take more than an hour to increase the nitrogen concentration to 99.99%, which is inefficient. In addition, each time air is directly introduced for testing, there may be undisplaced oxygen in the carbon molecular sieve, resulting in inaccurate and low repeatability of the tested carbon molecular sieve performance.

[0039] To overcome the problems of low efficiency, inaccuracy, and poor repeatability in carbon molecular sieve performance testing, this application provides a method for testing the performance of carbon molecular sieves. Please refer to [link to relevant documentation]. Figure 1 The testing method includes the following steps:

[0040] (1) The carbon molecular sieve to be tested is filled into the adsorption column 1, which is equipped with an inlet and an outlet.

[0041] (2) Introduce high-purity nitrogen into the adsorption column 1 through the inlet and monitor the nitrogen concentration at the outlet.

[0042] (3) When the nitrogen concentration at the outlet is the same as the concentration of high-purity nitrogen, the oxygen adsorbed in the carbon molecular sieve is completely replaced by nitrogen, and the flow of high-purity nitrogen stops; the concentration of high-purity nitrogen is 99.999%. Thus, the performance of the carbon molecular sieve can be tested more accurately and with higher repeatability.

[0043] (4) Air is introduced into the adsorption column 1 for a preset time from the inlet, and the nitrogen concentration at the outlet is monitored. The adsorption performance curve of the carbon molecular sieve is obtained by plotting the air introduction time on the x-axis and the nitrogen concentration at the outlet on the y-axis. Based on the adsorption performance curve, the performance of the carbon molecular sieve is determined. The nitrogen production rate and nitrogen production time of the carbon molecular sieve can be obtained from the adsorption performance curve. The higher the nitrogen production rate and the longer the nitrogen production time, the better the performance of the carbon molecular sieve. Among them, the nitrogen concentration at the outlet is 79.000%, and the carbon molecular sieve in the adsorption column 1 has reached the adsorption limit, so the air introduction is stopped. The air introduction time includes the total time of introducing high-purity nitrogen and the total time of introducing air.

[0044] In some embodiments of this application, when it is necessary to test the performance of multiple carbon molecular sieves simply and efficiently, the performance of multiple carbon molecular sieves is tested according to steps (1)-(4) to obtain multiple adsorption performance curves. The nitrogen concentration at the outlet is compared at the same preset time point in the multiple adsorption performance curves to compare the performance of multiple carbon molecular sieves. The preset time point is one of the preset time points after air is introduced. By directly comparing the nitrogen concentration at the outlet of multiple carbon molecular sieves at the same preset time point, the higher the nitrogen concentration at the outlet at the same preset time point, the better the performance of the carbon molecular sieve.

[0045] In some embodiments of this application, in order to maintain a suitable working pressure in the adsorption column 1 so as to ensure the optimal adsorption capacity of the carbon molecular sieve, the method further includes: determining the gas flow rate at the outlet before introducing high-purity nitrogen.

[0046] In some embodiments of this application, the method for determining the gas flow rate at the outlet includes: calculating it based on the working flow rate per unit mass of the carbon molecular sieve and the total mass of the carbon molecular sieve packed in the adsorption column 1.

[0047] In some embodiments of this application, in order to accurately test and determine the performance of carbon molecular sieves while completing the test quickly and efficiently, the diameter of the adsorption column 1 is 12.7-50.8 mm and the height is 300-1000 mm to load an appropriate amount of carbon molecular sieves. As an example, the diameter of the adsorption column 1 may be, but is not limited to, 12.7 mm, 15 mm, 18 mm, 22 mm, 26 mm, 30 mm, 32 mm, 38 mm, 40 mm, 43 mm, 46 mm, or 50.8 mm, and the height may be, but is not limited to, 300 mm, 400 mm, 500 mm, 600 mm, 700 mm, 800 mm, 900 mm, or 1000 mm.

[0048] This application also provides a testing device for the performance of carbon molecular sieves. Please refer to [link / reference]. Figure 1 The testing apparatus is used for the above-described testing method, and the testing apparatus includes:

[0049] Adsorption column 1, with an air inlet at one end and an air outlet at the other end;

[0050] The air inlet pipe is connected to the air inlet and is used to introduce high-purity nitrogen or air into the adsorption column 1, respectively.

[0051] The gas outlet pipe 3 is connected to the gas outlet and is equipped with a nitrogen concentration monitor 6 for testing the nitrogen concentration at the gas outlet. For example, the nitrogen concentration monitor 6 has an accuracy of ±0.25% and a maximum range of 99.999%.

[0052] First, high-purity nitrogen gas with a concentration of 99.999% is introduced into the adsorption column 1 through the inlet pipe. When the nitrogen concentration monitor 6 detects that the nitrogen concentration in the outlet pipe 3 reaches 99.999% of the concentration of the introduced high-purity nitrogen, it indicates that the oxygen adsorbed by the carbon molecular sieve in the adsorption column 1 has been completely replaced by nitrogen, and the introduction of high-purity nitrogen is stopped. Then, air is introduced into the adsorption column 1 through the inlet pipe. When the nitrogen concentration monitor 6 detects that the nitrogen concentration in the outlet pipe 3 reaches 79.000%, it indicates that the carbon molecular sieve in the adsorption column 1 has reached its adsorption limit and can no longer adsorb oxygen, and the introduction of air is stopped. This allows for efficient, accurate, and highly repeatable testing of the carbon molecular sieve performance.

[0053] In some embodiments of this application, the air intake pipeline includes an air intake manifold 2, a nitrogen pipeline 4, and an air pipeline 5. One end of the air intake manifold 2 is connected to the air inlet, and the other end is connected to the nitrogen pipeline 4 and the air pipeline 5 respectively. A nitrogen inlet valve 41 is provided on the nitrogen pipeline 4; and / or an air inlet valve 51 is provided on the air pipeline 5; and / or an outlet valve 31 is provided on the outlet pipeline 3.

[0054] When it is necessary to introduce high-purity nitrogen into the adsorption column 1, the nitrogen inlet valve 41 is controlled to open the nitrogen pipeline 4 to introduce high-purity nitrogen. When the introduction of high-purity nitrogen is stopped, the nitrogen inlet valve 41 is controlled to close the nitrogen pipeline 4. When it is necessary to introduce air into the adsorption column 1, the air inlet valve 51 is controlled to open the air pipeline 5 to introduce air. When the introduction of air is stopped, the air inlet valve 51 is controlled to close the air pipeline 5. The exhaust valve 31 is used to control the opening and closing of the exhaust pipeline 3.

[0055] In some embodiments of this application, a flow meter 7 is provided on the outlet pipe 3, and a pressure valve (not shown in the figure) is provided on the inlet main pipe 2. As an example, the flow meter 7 is a glass rotor flow meter 7 with a specification of 0-10 slpm.

[0056] First, adjust the pressure valve to the working pressure of the carbon molecular sieve to control the pressure of the gas entering the inlet pipe, so that the gas entering the adsorption column 1 has the working pressure of the carbon molecular sieve, and the carbon molecular sieve performs adsorption under the working pressure; at the same time, the flow meter 7 controls the outflow of the gas in the outlet pipe 3, so that the adsorption column 1 is always kept at a suitable working pressure for the carbon molecular sieve, thereby ensuring the best adsorption capacity of the carbon molecular sieve when it is working.

[0057] In some embodiments of this application, the nitrogen concentration monitor 6 is connected to a paperless recorder 8, which can directly record the nitrogen concentration data monitored by the nitrogen concentration monitor 6 in a paperless manner, which is convenient and fast.

[0058] The features and performance of this application will be further described in detail below with reference to the embodiments.

[0059] Example 1

[0060] This embodiment provides a method for testing the performance of carbon molecular sieves, the method including the following steps:

[0061] (1) The carbon molecular sieve A to be tested is filled into the adsorption column 1. One end of the adsorption column 1 has an air inlet and the other end has an air outlet. The air inlet is connected to one end of the air inlet manifold 2. The other end of the air inlet manifold 2 is connected to the nitrogen pipeline 4 and the air pipeline 5 respectively. The nitrogen pipeline 4 is equipped with a nitrogen inlet valve 41, the air pipeline 5 is equipped with an air inlet valve 51, and the air inlet manifold 2 is equipped with a pressure valve. The air outlet is connected to the air outlet pipeline 3. The air outlet pipeline 3 is equipped with a nitrogen concentration monitor 6, a flow meter 7, and an air outlet valve 31.

[0062] (2) Adjust the pressure valve to the working pressure of carbon molecular sieve A to control the pressure of the gas entering the inlet pipeline; and calculate the gas flow rate at the outlet based on the working flow rate per unit mass of carbon molecular sieve A and the total mass of carbon molecular sieve filled in the adsorption column 1, and set the flow rate of flow meter 7 accordingly.

[0063] (3) Open the nitrogen inlet valve 41 and introduce high-purity nitrogen into the adsorption column 1 through the nitrogen pipeline 4. Monitor the nitrogen concentration in the outlet pipeline 3 through the nitrogen concentration monitor 6.

[0064] (4) When the nitrogen concentration in the outlet pipe 3 is 99.999% and the concentration of the high-purity nitrogen introduced is the same, the oxygen adsorbed in the carbon molecular sieve A is completely replaced by nitrogen. Then close the nitrogen inlet valve 41 and stop the introduction of high-purity nitrogen.

[0065] (5) Open the air inlet valve 51 and introduce air into the adsorption column 1 for a preset time. Monitor the nitrogen concentration in the outlet pipe 3 through the nitrogen concentration monitor 6. When the nitrogen concentration in the outlet pipe 3 is 79.000%, the carbon molecular sieve A in the adsorption column 1 has reached the adsorption limit. Close the air inlet valve 51 and stop the air supply.

[0066] Using the total time for introducing high-purity nitrogen and air as the x-axis and monitoring the nitrogen concentration in outlet pipe 3 as the y-axis, the adsorption performance curve of carbon molecular sieve A is obtained. Based on the adsorption performance curve, the performance of carbon molecular sieve A is determined.

[0067] Example 2

[0068] This embodiment provides a method for testing the performance of carbon molecular sieves, the method including the following steps:

[0069] (1) The carbon molecular sieve B to be tested is filled into the adsorption column 1. One end of the adsorption column 1 has an air inlet and the other end has an air outlet. The air inlet is connected to one end of the air inlet manifold 2. The other end of the air inlet manifold 2 is connected to the nitrogen pipeline 4 and the air pipeline 5 respectively. The nitrogen pipeline 4 is equipped with a nitrogen inlet valve 41, the air pipeline 5 is equipped with an air inlet valve 51, and the air inlet manifold 2 is equipped with a pressure valve. The air outlet is connected to the air outlet pipeline 3. The air outlet pipeline 3 is equipped with a nitrogen concentration monitor 6, a flow meter 7, and an air outlet valve 31.

[0070] (2) Adjust the pressure valve to the working pressure of carbon molecular sieve B to control the pressure of the gas entering the inlet pipeline; and calculate the gas flow rate at the outlet based on the working flow rate per unit mass of carbon molecular sieve B and the total mass of carbon molecular sieve filled in adsorption column 1, and set the flow rate of flow meter 7 accordingly.

[0071] (3) Open the nitrogen inlet valve 41 and introduce high-purity nitrogen into the adsorption column 1 through the nitrogen pipeline 4. Monitor the nitrogen concentration in the outlet pipeline 3 through the nitrogen concentration monitor 6.

[0072] (4) When the nitrogen concentration in the outlet pipe 3 is 99.999% and the concentration of the high-purity nitrogen introduced is the same, the oxygen adsorbed in the carbon molecular sieve B is completely replaced by nitrogen. Then close the nitrogen inlet valve 41 and stop the introduction of high-purity nitrogen.

[0073] (5) Open the air inlet valve 51 and introduce air into the adsorption column 1 for a preset time. Monitor the nitrogen concentration in the outlet pipe 3 through the nitrogen concentration monitor 6. When the nitrogen concentration in the outlet pipe 3 is 79.000%, the carbon molecular sieve B in the adsorption column 1 has reached the adsorption limit. Close the air inlet valve 51 and stop the air supply.

[0074] Using the total time for introducing high-purity nitrogen and air as the x-axis and monitoring the nitrogen concentration in outlet pipe 3 as the y-axis, the adsorption performance curve of carbon molecular sieve B is obtained. Based on the adsorption performance curve, the performance of carbon molecular sieve B is determined.

[0075] Test case

[0076] The adsorption performance curves obtained by testing carbon molecular sieve A in Example 1 and the adsorption performance curves obtained by testing carbon molecular sieve B in Example 2 are as follows: Figure 2 As shown.

[0077] Depend on Figure 2 It can be seen that at the same preset time point, the nitrogen concentration in the gas outlet pipe 3 monitored when testing carbon molecular sieve A is higher than that monitored when testing carbon molecular sieve B, indicating that carbon molecular sieve A has better performance than carbon molecular sieve B.

[0078] The embodiments described above are some, but not all, of the embodiments of this application. The detailed description of the embodiments of this application is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

Claims

1. A method for testing the properties of carbon molecular sieves, characterized in that, The testing method includes the following steps: (1) The carbon molecular sieve to be tested is filled into the adsorption column, which is provided with an inlet and an outlet. (2) High-purity nitrogen gas is introduced into the adsorption column through the inlet, and the nitrogen concentration at the outlet is monitored; (3) When the nitrogen concentration at the outlet is consistent with the concentration of the high-purity nitrogen, the flow of the high-purity nitrogen is stopped; the concentration of the high-purity nitrogen is 99.999%. (4) Air is introduced into the adsorption column through the air inlet, and the nitrogen concentration at the air outlet is monitored. When the nitrogen concentration at the air outlet is 79.000%, the air supply is stopped. The adsorption performance curve of the carbon molecular sieve is obtained by plotting the air supply time on the x-axis and the nitrogen concentration at the air outlet on the y-axis. Based on the adsorption performance curve, the performance of the carbon molecular sieve is determined. The air supply time includes the total time for introducing high-purity nitrogen and air. According to steps (1)-(4), the performance of multiple carbon molecular sieves is tested to obtain multiple adsorption performance curves. The nitrogen concentration at the outlet is compared at the same preset time point in the multiple adsorption performance curves to compare the performance of multiple carbon molecular sieves. The preset time point is one of the preset time points after air is introduced.

2. The test method according to claim 1, characterized in that, Before introducing the high-purity nitrogen gas, the method further includes the step of determining the gas flow rate at the outlet.

3. The test method according to claim 2, characterized in that, The method for determining the gas flow rate at the outlet includes: calculating it based on the working flow rate per unit mass of the carbon molecular sieve and the total mass of the carbon molecular sieve packed into the adsorption column.

4. The test method according to claim 3, characterized in that, The adsorption column has a diameter of 12.7-50.8 mm and a height of 300-1000 mm.

5. A testing device for the performance of carbon molecular sieves, characterized in that, The testing apparatus is used to implement the testing method according to any one of claims 1-4, and the testing apparatus comprises: An adsorption column, wherein one end of the adsorption column has the air inlet and the other end of the adsorption column has the air outlet; An air inlet pipe is connected to the air inlet and is used to introduce high-purity nitrogen or air into the adsorption column, respectively. An outlet pipe is provided, which is connected to the outlet. The outlet pipe is equipped with a nitrogen concentration monitor for testing the nitrogen concentration at the outlet.

6. The testing apparatus according to claim 5, characterized in that, The intake pipeline includes an intake manifold, a nitrogen pipeline, and an air pipeline. One end of the intake manifold is connected to the air inlet, and the other end is connected to the nitrogen pipeline and the air pipeline respectively. A nitrogen intake valve is provided on the nitrogen pipeline; an air intake valve is provided on the air pipeline; and an air outlet valve is provided on the outlet pipeline.

7. The testing apparatus according to claim 6, characterized in that, A flow meter is installed on the outlet pipe, and a pressure valve is installed on the inlet main pipe.

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