Analog moving bed apparatus and method for light isotope gas separation

Abstract

The application provides a simulated moving bed device and method for light isotope gas separation. It belongs to the technical field of light isotope gas separation. The device comprises an isotope gas control system, a solenoid valve, a low-temperature control system, an integrated control system and an adsorption column; at least two adsorption columns for performing adsorption, two adsorption columns for performing replacement and two adsorption columns for performing regeneration; the adsorption columns for performing adsorption are connected in series with the adsorption columns for performing replacement; raw gas is connected with the adsorption columns for performing adsorption, and replacement gas is connected with the adsorption columns for performing replacement. The application realizes selective enrichment and separation of low-abundance components in multiple isotopes, and the recovery rate of target components is obviously higher than that of other adsorption separation processes; the isotope adsorption separation method under low temperature is further optimized, and the problems of high energy consumption, low selectivity, low recovery rate and difficult continuous production in the isotope production process are solved; at least two towers are connected in parallel to perform pressure reduction regeneration operation, thereby improving the regeneration effect and reducing the energy consumption.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of light isotope gas separation, and relates to a simulated moving bed device and method for light isotope gas separation. BACKGROUND

[0002] Stable light isotopes (deuterium 2 H, carbon 13 C, nitrogen 15 N, oxygen 18 O, etc.) are important nuclide materials or tracer atoms, and are widely used in the fields of nuclear industry, medicine, environment and geology. The increasing demand for isotope applications puts higher requirements on the preparation and separation and purification of isotope raw materials. However, due to the same atomic number and the same number of outer electrons of isotopes, the difference in physical and chemical properties is very small, and the natural abundance of isotopes is low, which makes it difficult to separate and purify. The industrial isotope separation methods mainly include low-temperature rectification method, thermal diffusion method, chemical exchange method, chromatographic separation method, etc. However, these methods are difficult to balance in energy consumption, yield and recovery rate, and the development of new high-efficiency isotope separation methods is still a challenging task.

[0003] The adsorption separation method based on quantum sieving effect is a new type of light isotope gas separation technology. At low temperature, in the nanopore channel, the molecules are subjected to the constraint zero-point energy of the channel. The lighter isotope molecules have a larger zero-point energy, so it is more difficult to enter and stay in the channel. The heavier isotope molecules have a smaller zero-point energy and are preferentially adsorbed on the adsorbent. However, the selectivity of the porous adsorbent for light isotope gas is still limited, and a high-efficiency separation device is needed to realize high-efficiency light isotope gas separation. SUMMARY

[0004] In order to achieve the above purpose, the present application provides a simulated moving bed device for light isotope gas separation, comprising an isotope gas control system, a solenoid valve, a low-temperature control system, an integrated control system and an adsorption column.

[0005] The isotope gas control system comprises an isotope gas, a flow controller and a gas mixing pipeline, the isotope gas is connected with the flow controller, and then connected with the gas mixing pipeline, and the gas mixing pipeline is connected with the adsorption column.

[0006] The solenoid valve comprises a plurality of solenoid valves arranged at the top, bottom and side of the adsorption column.

[0007] The low-temperature control system comprises a cold trap, a coolant liquid level controller and a mechanical transmission device; the cold trap is filled with coolant, and the temperature of the adsorption column and the corresponding pipeline is kept constant at 77K-160K to meet the low-temperature environment required by the isotope gas separation and match different isotope gas separation requirements; the mechanical transmission device is a scissor-type lifter, which immerses or removes the adsorption column and the corresponding gas pipeline into or out of the cold trap.

[0008] The integrated control system comprises control software running on a computer and a PLC controller, the computer is connected with the PLC controller through a network cable, the PLC controller is connected with a flow controller and a solenoid valve through a network cable to control the flow of isotope gas, the flow of gas in the mixing pipeline into the adsorption column, the flow of product gas out of the adsorption column and the connection mode of series or parallel connection between the adsorption columns.

[0009] The adsorption column comprises at least two adsorption columns for performing adsorption, two adsorption columns for performing replacement and two adsorption columns for performing regeneration; the adsorption columns for performing adsorption are connected in series with the adsorption columns for performing replacement; the gas in the mixing pipeline comprises isotope raw gas and replacement gas, the isotope raw gas is connected with the adsorption columns for performing adsorption, and the replacement gas is connected with the adsorption columns for performing replacement.

[0010] The isotope raw gas comprises hydrogen isotope, oxygen isotope, methane isotope, nitrogen isotope, ammonia isotope, carbon dioxide isotope or rare gas isotope, and the replacement gas comprises heavy component isotope in the same operation.

[0011] The hydrogen isotope comprises H2 / D2, D2 / T2, H2 / T2 or H2 / D2 / T2; the oxygen isotope comprises 16 O2 / 18 O2, the methane isotope comprises 12 CH4 / 13 CH4 or 12 CH4 / 12 CD 4； The nitrogen isotope comprises 14 N2 / 15 N2; the ammonia isotope comprises 14 NH3 / 15 NH3 or 14 NH3 / 14 ND3; the carbon dioxide isotope comprises 12 CO2 / 13 CO2 or 12 C 16 O2 / 12 C 18 O2; the rare gas isotope comprises 3 He / 4 He、 20Ne / 21 Ne / 22 Ne or 36 Ar / 38 Ar / 40 Ar.

[0012] The coolant includes liquid nitrogen or a mixture of liquid nitrogen and an organic substance.

[0013] The coolant level controller is connected with the cold trap through a coolant pipeline to automatically add coolant to maintain a constant liquid level.

[0014] The adsorption column is a packed fixed bed, and the material of the adsorption column is stainless steel.

[0015] The size of the adsorption column can be customized according to the processing capacity requirement, and the length is 8 cm-1000 cm, and the diameter is 0.6 cm-200 cm.

[0016] The adsorbent in the adsorption column includes one or more of metal oxides, non-metal oxides, inorganic salts, porous carbon, zeolite molecular sieves, metal-organic frameworks (MOFs), covalent organic frameworks (COFs), hydrogen-bonded organic frameworks (HOFs), and porous polymers (POPs).

[0017] The adsorption columns performing regeneration are connected in parallel to increase the regeneration efficiency.

[0018] The adsorption columns performing adsorption are connected in series, and the adsorption columns performing displacement are connected in series.

[0019] The product collection system includes a gas storage tank connected to the top of the adsorption column or connected to the bottom of the adsorption column through a vacuum pump.

[0020] The product detection system includes a mass spectrometer connected to the top of the adsorption column or connected to the bottom of the column through a vacuum pump.

[0021] The pressure in the adsorption column is controlled by a vacuum pump and an isotopic gas control system, and the pressure regulation range is 0.0001 Mpa-0.1 Mpa.

[0022] The regeneration includes one or more of purging, vacuum, and vacuum purging.

[0023] The method for separating light isotopes by using the simulated moving bed device includes the following steps:

[0024] S1 Fill the adsorption column with pre-activated adsorbent, and use inert gas to purge the pipeline and the adsorbent to remove impurity gas;

[0025] S2 filling the cooling agent in the cold trap, immersing the adsorption column and the corresponding gas pipeline into the cold trap by the mechanical transmission device, waiting for the constant temperature, and closing the adsorption column outlet valve during the process, continuously feeding the inert gas into the adsorption column, and maintaining the positive pressure in the column to prevent the impurity gas from entering;

[0026] S3 running the working program on the integrated control system, feeding the isotope raw gas into the adsorption column for performing adsorption by the isotope gas control system, feeding the displacement gas into the adsorption column for performing displacement, and performing regeneration in the adsorption column for performing regeneration;

[0027] S4 switching the valve every 4-20 min to make the adsorption column perform different operations to simulate the reverse movement of the adsorbent relative to the gas, the first adsorption column for performing adsorption performs displacement operation, the first adsorption column for performing displacement performs regeneration operation, and the first adsorption column for performing regeneration operation performs adsorption operation, specifically, the Xth adsorption column performs the operation performed by the original X-1th adsorption column (X>=2), and the first adsorption column performs the operation performed by the original last adsorption column, and the order of the adsorption columns increases from left to right.

[0028] The adsorption columns in step S3 are sequentially the adsorption column for performing regeneration, the adsorption column for performing displacement and the adsorption column for performing adsorption from left to right.

[0029] Further comprising collecting the product by the product collection system after 5-10 rounds of operation.

[0030] Further comprising detecting the product by the product detection system after 5-10 rounds of operation.

[0031] Further comprising closing the working program on the integrated control system after separating the required isotope gas, removing the adsorption column and the corresponding gas pipeline from the cold trap by the mechanical transmission device, and recycling the remaining cooling agent in the cold trap for the next operation.

[0032] Compared with the prior art, the technical scheme of the present application has the following advantages and beneficial effects:

[0033] The existing temperature swing (pressure swing temperature swing) isotope gas separation method needs a long temperature rising-regeneration-cooling time, which reduces the production efficiency and increases the consumption of cooling agent during the cooling process. The simulated moving bed device in the present application allows in-situ pressure swing regeneration operation at low temperature, improves the production efficiency, saves the cooling agent, and reduces the energy consumption.

[0034] The present application optimizes the layout of the gas pipeline, adds a low-temperature control system, and realizes the stable temperature of the adsorption column and the corresponding pipeline in the low-temperature environment, so as to meet the requirements of isotope gas separation. And the temperature of the adsorption column and the corresponding pipeline can be kept constant at 77K-160K by liquid nitrogen or liquid nitrogen mixed with organic solvents in different proportions, so as to adapt to different isotope gas separation requirements.

[0035] Compared with the existing pressure swing adsorption gas isotope separation device, the simulated moving bed device of the application allows the gas adsorption separation operation to be performed in a multi-tower series mode by integrating the control system, increases the length of the adsorption column, improves the utilization efficiency of the adsorbent, and improves the gas isotope separation efficiency.

[0036] By integrating the control system, the simulated moving bed device of the application allows the gas heavy component displacement operation to be performed in a multi-tower series mode, and the multi-tower multi-stage displacement further enriches the heavy component; the light component mixed gas discharged from the top of the adsorption column performing the displacement operation enters the adsorption column performing the adsorption operation, further recovering the heavy component.

[0037] By integrating the control system, the simulated moving bed device of the application performs pressure reduction regeneration operation in at least 2 towers in parallel, avoiding the reduction of regeneration efficiency caused by the pressure drop of the long adsorption column. Due to the slow molecular diffusion at low temperature, multi-tower parallel regeneration is used to improve the regeneration effect.

[0038] The simulated moving bed device of the application can operate in three regeneration modes, including purging, vacuum, and vacuum purging, and different regeneration modes or a combination of multiple regeneration modes can be selected according to the strength of the adsorbent and the required isotope gas interaction and the demand for the required target gas component to further improve the regeneration efficiency.

[0039] The product detection system of the application can monitor the composition of the obtained product in real time. And the composition of the product in the gas storage tank can be detected. BRIEF DESCRIPTION OF DRAWINGS

[0040] Figure 1 A simulated moving bed device for light isotope gas separation.

[0041] Figure 2 A schematic diagram of the function of the adsorption column in Example 2.

[0042] Figure 3 The composition of the heavy component product gas.

[0043] Figure 4 Comparison of separation effects before and after regeneration in a low temperature environment.

[0044] Figure 5 Separation effect of 13X zeolite single column.

[0045] Among them, 1 is a gas control system, 11 is a gas mixing pipeline, 2 is a solenoid valve, 3 is a low temperature control system, 31 is a coolant, 32 is a cold trap, 33 is a coolant level controller, 34 is a mechanical transmission device, 4 is an integrated control system, 41 is control software, 42 is a PLC controller, 43 is a network cable, 5 is an adsorption column, 6 is a product collection system, 61 is a vacuum pump, 62 is a gas storage tank, 7 is a mass spectrometer. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the invention.

[0047] Example 1

[0048] like Figures 1-2 As shown, a simulated moving bed device for light isotope gas separation includes an isotope gas control system 1, a solenoid valve 2, a cryogenic control system 3, an integrated control system 4, an adsorption column 5, a product collection system 6, and a product detection system.

[0049] The isotope gas control system 1 includes an isotope gas, a flow controller, and a gas mixing pipeline 11. The isotope gas is connected to the flow controller and then to the gas mixing pipeline 11. The gas mixing pipeline 11 is connected to the adsorption column 5.

[0050] The solenoid valve 2 includes several solenoid valves placed at the top, bottom and sides of the adsorption column 5.

[0051] The cryogenic control system 3 includes a cold trap 32, a coolant level controller 33, and a mechanical transmission device 34. Coolant 31 is added to the cold trap 32 to maintain the temperature of the adsorption column 5 and corresponding pipelines at 77K-160K, so as to meet the low-temperature environment required for isotope gas separation and match the different isotope gas separation requirements. The coolant level controller 33 is connected to the cold trap 32 through coolant pipelines and automatically replenishes coolant to maintain a constant level. The mechanical transmission device 34 is a scissor lift that immerses or removes the adsorption column 5 and corresponding gas pipelines from the cold trap.

[0052] The integrated control system 4 includes control software 41 running on a computer and a PLC controller 42. The computer is connected to the PLC controller 42 via a network cable 43. The PLC controller 42 is connected to a flow controller and a solenoid valve 2 via a network cable 43 to control the flow rate of the isotope gas, the flow of gas into the adsorption column in the gas mixing pipeline, the flow of product gas out of the adsorption column, and the series or parallel connection mode between the adsorption columns. The specific control logic of the integrated control system 4 is as follows: the target flow rate of the isotope gas is preset in the control software 41, and the PLC controller 42 sends an instruction to the flow controller to set the target flow rate; the control software 41 issues instructions to the PLC controller 42 according to the process requirements, including instructions for gas flowing into the adsorption column, product gas flowing out of the adsorption column, and "series / parallel" switching; the PLC controller 42 triggers the on / off state of the corresponding solenoid valve 2 to realize the on / off of the pipeline for gas flowing into the adsorption column and product gas flowing out of the adsorption column, as well as the switching of the series / parallel connection mode between the adsorption columns.

[0053] The adsorption column comprises at least two adsorption columns for performing adsorption, two adsorption columns for performing displacement and two adsorption columns for performing regeneration; the adsorption columns for performing adsorption are connected in series with the adsorption columns for performing displacement; the gas in the gas mixing pipeline comprises isotopic raw gas and displacement gas, the isotopic raw gas is connected with the adsorption columns for performing adsorption, and the displacement gas is connected with the adsorption columns for performing displacement.

[0054] The isotopic raw gas comprises hydrogen isotopes, oxygen isotopes, methane isotopes, nitrogen isotopes, ammonia isotopes, carbon dioxide isotopes or rare gas isotopes, and the displacement gas comprises heavy component isotopes in the same operation.

[0055] The hydrogen isotopes comprise H2 / D2, D2 / T2, H2 / T2 or H2 / D2 / T2; the oxygen isotopes comprise 16 O2 / 18 O2, the methane isotopes comprise 12 CH4 / 13 CH4 or 12 CH4 / 12 CD 4； The nitrogen isotopes comprise 14 N2 / 15 N2; the ammonia isotopes comprise 14 NH3 / 15 NH3 or 14 NH3 / 14 ND3; the carbon dioxide isotopes comprise 12 CO2 / 13 CO2 or 12 C 16 O2 / 12 C 18 O2; the rare gas isotopes comprise 3 He / 4 He, 20 Ne / 21 Ne / 22 Ne or 36 Ar / 38 Ar / 40 Ar.

[0056] The coolant comprises liquid nitrogen or a mixture of liquid nitrogen and an organic substance.

[0057] The adsorption column is a packed fixed bed, and the material of the adsorption column is stainless steel. The size of the adsorption column can be customized according to the processing capacity requirement, and the length is 8 cm -1000 cm and the diameter is 0.6 cm -200 cm.

[0058] The adsorbent includes one or more of metal oxides, non-metal oxides, inorganic salts, porous carbon, zeolite molecular sieves, metal organic frameworks (MOFs), covalent organic frameworks (COFs), hydrogen-bonded organic frameworks (HOFs) and porous polymers (POPs).

[0059] The adsorption columns performing regeneration are connected in parallel, increasing the regeneration efficiency.

[0060] The adsorption columns performing regeneration are connected in parallel, increasing the regeneration efficiency.

[0061] The adsorption columns performing adsorption are connected in series; the adsorption columns performing displacement are connected in series.

[0062] The product collection system 6 includes a gas storage tank 62 connected to the bottoms of the adsorption columns performing regeneration through a vacuum pump 61.

[0063] The product detection system includes a mass spectrometer 7 connected to the bottoms of the adsorption columns performing regeneration through a vacuum pump 61.

[0064] The pressure in the adsorption columns is controlled by a vacuum pump and an isotopic gas control system, with a pressure regulation range of 0.0001 Mpa - 0.1 Mpa.

[0065] Example 2

[0066] A simulated moving bed device for isotopic separation described in Example 1 is used for hydrogen isotope separation (H2 / D2) as an example, with 13X zeolite material as the adsorbent, to perform isotopic separation operations, including the following steps:

[0067] Step one: fill 10 adsorption columns with adsorbent activated under vacuum at 300°C for 6h, and use neon gas to purge the pipeline and adsorbent to remove impurity gases. The adsorption columns are made of stainless steel, with a single length of 10cm and a diameter of 1cm.

[0068] Step two: fill the cold trap 32 with liquid nitrogen, use a mechanical transmission device 34 to immerse the adsorption columns 5 and the corresponding gas pipeline into the cold trap 32, wait for the temperature to be constant, close the adsorption column outlet valve during this process, continuously introduce neon gas into the adsorption column, and maintain the column pressure as positive pressure to prevent impurity gases from entering.

[0069] Step three: running the work program on the integrated control system, the isotope gas control system 1 introduces H2 / D2 / Ne mixed gas (5% / 5% / 90%, volume ratio) into the adsorption column for adsorption, and introduces D2 / Ne mixed gas (5% / 95%, volume ratio) into the adsorption column for displacement. The coolant level controller 33 automatically adds liquid nitrogen to maintain the liquid level. The operation mode of the adsorption column 5 is from left to right, three adsorption columns for regeneration (①-③), three adsorption columns for displacement (④-⑥), and four adsorption columns for adsorption (⑦-⑩), and the operation mode is as shown in Figure 2 The adsorption columns for regeneration are connected in parallel to improve the regeneration effect. The adsorption columns for displacement are connected in series, and the multi-stage displacement is used to further enrich the heavy components, and the adsorption columns for displacement are connected in series with the adsorption columns for adsorption to discharge D2. The four adsorption columns for adsorption are connected in series to efficiently adsorb heavy components and discharge light components from the top of the column. The pressure in the adsorption columns for adsorption and displacement is controlled at 0.1 MPa. The regeneration is performed by vacuum, and the pressure in the adsorption columns for regeneration is 4 KPa.

[0070] Step four: every 10 minutes, the valve is switched to simulate the movement of the adsorbent. The ① adsorption column for regeneration performs the adsorption operation performed by the original adsorption column ⑩, the ⑦ adsorption column for adsorption performs the displacement operation performed by the original adsorption column ⑥, the ④ adsorption column for displacement performs the regeneration operation performed by the original adsorption column ③, and the remaining adsorption columns are simulated to move in the same direction, specifically, the ② and ③ adsorption columns perform the regeneration operations performed by the original adsorption columns ① and ② respectively; the ⑤ and ⑥ adsorption columns perform the displacement operations performed by the original adsorption columns ④ and ⑤ respectively; the ⑧, ⑨ and ⑩ adsorption columns perform the adsorption operations performed by the original adsorption columns ⑦, ⑧ and ⑨ respectively.

[0071] Step five: after 10 cycles, the product detection system detects the composition of the gas flowing out of the tail end of the vacuum pump, and the detection result is as shown in Figure 3 The product is collected in the gas tank 62.

[0072] Step six: after running for 100 minutes, the work program on the integrated control system is turned off, the mechanical transmission device is used to move the adsorption columns and the corresponding gas pipelines out of the cold trap, and the remaining liquid nitrogen in the cold trap is recovered for the next operation.

[0073] The regeneration effect of the present application is shown in Figure 4 The adsorbent has good adsorption and separation performance after regeneration.

[0074] The D2 purity obtained by the 13X zeolite single column separation is 68.4%, as shown in Figure 5 Compared with single column separation, the D2 purity obtained by the present application is greatly improved to 98.9%.

Claims

1. A simulated moving bed apparatus for the separation of light isotopic gases, characterized in that: The system comprises an isotope gas control system (1), an electromagnetic valve (2), a low-temperature control system (3), an integrated control system (4) and an adsorption column (5). The isotope gas control system (1) comprises isotope gas, a flow controller and a gas mixing pipeline (11), the isotope gas is connected with the flow controller, and then connected with the gas mixing pipeline (11), and the gas mixing pipeline (11) is connected with the adsorption column (5). The electromagnetic valve (2) comprises several electromagnetic valves arranged at the top, bottom and side of the adsorption column. The low-temperature control system (3) comprises a cold trap (32), a coolant level controller (33) and a mechanical transmission device (34), the coolant (31) is added in the cold trap (32), the temperature of the adsorption column and the corresponding pipeline is kept constant at 77K-160K, and the mechanical transmission device (34) is a scissor-type elevator, which immerses or removes the adsorption column and the corresponding gas pipeline in or out of the cold trap. The integrated control system (4) comprises a control software (41) running on a computer and a PLC controller (42), the computer is connected with the PLC controller (42) through a network cable (43), and the PLC controller (42) is connected with the flow controller and the electromagnetic valve (2) through the network cable (43). The adsorption column (5) comprises at least two adsorption columns for adsorption, two adsorption columns for displacement and two adsorption columns for regeneration, the adsorption columns for adsorption are connected in series with the adsorption columns for displacement, and the gas in the gas mixing pipeline comprises isotope raw gas and displacement gas, the isotope raw gas is connected with the adsorption columns for adsorption, and the displacement gas is connected with the adsorption columns for displacement.

2. A simulated moving bed apparatus for the separation of light isotopes as claimed in claim 1, characterized in that: The isotope raw gas comprises hydrogen isotope, oxygen isotope, methane isotope, nitrogen isotope, ammonia isotope, carbon dioxide isotope or rare gas isotope, and the displacement gas comprises heavy component isotope in the same operation.

3. A simulated moving bed apparatus for the separation of light isotopes as claimed in claim 1, characterized in that: The coolant (31) comprises liquid nitrogen or a mixture of liquid nitrogen and an organic substance. The coolant level controller (33) is connected with the cold trap (32) through a coolant pipeline, and the coolant (31) is automatically added to keep the liquid level constant.

4. A simulated moving bed apparatus for the separation of light isotopes as claimed in claim 1, characterized in that: The adsorption column (5) is a packed fixed bed, and the material of the adsorption column is stainless steel. The length of the adsorption column (5) is 8cm-1000cm, and the diameter is 0.6cm-200cm. The adsorbent in the adsorption column (5) comprises one or more of metal oxides, non-metal oxides, inorganic salts, porous carbon, zeolite molecular sieve, metal organic framework, covalent organic framework, hydrogen-bonded organic framework and porous polymer.

5. A simulated moving bed apparatus for the separation of light isotopes as claimed in claim 1, characterized in that: The adsorption columns for regeneration are connected in parallel, the adsorption columns for adsorption are connected in series, and the adsorption columns for displacement are connected in series.

6. A simulated moving bed apparatus for the separation of light isotopes as claimed in claim 1, characterized in that: The system further comprises a product collection system (6) and / or a product detection system, the product collection system comprises a gas storage tank (62) connected with the top of the adsorption column (5) or connected with the bottom of the adsorption column through a vacuum pump (61), and the product detection system comprises a mass spectrometer (7) connected with the top of the adsorption column or connected with the bottom of the adsorption column through the vacuum pump (61).

7. A simulated moving bed apparatus for the separation of light isotopes as claimed in claim 1, characterized in that: The pressure in the adsorption column (5) is 0.0001 Mpa-0.1 Mpa; The regeneration includes one or several of purging, vacuum and vacuum purging.

8. A method for the separation of light isotopes using the simulated moving bed apparatus according to claim 1, characterized in that: The method comprises the following steps: S1: filling the adsorption column with pre-activated adsorbent and purging the pipeline and adsorbent with inert gas to remove impurity gas; S2: filling the cold trap (32) with coolant (31), immersing the adsorption column (5) and the corresponding gas pipeline into the cold trap (32) by using a mechanical drive (34), and keeping the temperature constant; during this process, closing the outlet valve of the adsorption column (5), continuously feeding inert gas into the adsorption column (5), and maintaining the pressure in the column as positive pressure to prevent impurity gas from entering; S3: running the working program on the integrated control system (4), feeding isotope raw gas into the adsorption column for adsorption, feeding displacement gas into the adsorption column for displacement, and regenerating the adsorption column for regeneration; S4: every 4-20 minutes, switching the valve to make the adsorption column perform different operations to simulate the reverse movement of the adsorbent relative to the gas, the first adsorption column for adsorption performs displacement operation, the first adsorption column for displacement performs regeneration operation, and the first adsorption column for regeneration performs adsorption operation; specifically, the Xth adsorption column performs the operation of the original X-1th adsorption column (X≥2), the first adsorption column performs the operation of the original last adsorption column, and the order of the adsorption column increases from left to right.

9. The method of light isotope separation as claimed in claim 8, characterized in that: After 5-10 rounds of operation, the product collection system (6) collects the product and / or the product detection system detects the product.

10. The method of light isotope separation as claimed in claim 8, characterized in that: After separating the required isotope gas, the working program on the integrated control system (4) is closed, the adsorption column (5) and the corresponding gas pipeline are removed from the cold trap (32) by using a mechanical drive (34), and the remaining coolant in the cold trap (32) is recovered for the next operation.

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