System and method for low-temperature separation and concentration of stable isotopes

Abstract

The invention discloses a system and a method for low-temperature separation and concentration of stable isotopes. Relates to the technical field of isotope separation, and comprises a plurality of separation towers, each two separation towers are connected in series; the plurality of condensers are arranged, each condenser is respectively communicated with two adjacent separation towers, each condenser is communicated with one separation tower, and each condenser is communicated with the other adjacent separation tower; the first heat exchanger is communicated with the first separating tower, and the second heat exchanger is communicated with the last separating tower through a condenser; and the plurality of reboilers are arranged, each reboiler is communicated with the separation tower, each reboiler is communicated with the separation tower, each reboiler is further communicated with another adjacent separation tower, and the last separation tower is communicated with the second heat exchanger through the reboiler. According to the invention, the plurality of separating towers are connected in series, each condenser is communicated with two adjacent separating towers, each reboiler is communicated with the separating tower and the other adjacent separating tower, and the arrangement of communicating pipelines among the components is more reasonable, so that the use is more convenient.

Description

Technical Field

[0001] The present invention relates to the technical field of isotope separation, and more particularly to a system and method for low-temperature separation and concentration of stable isotopes. Background Art

[0002] Isotopes have important applications in defense, space exploration, medical treatment and other fields, and their extraction is quite difficult. Isotope separation is the study of the separation of different isotopes of the same element. The separated isotopes should belong to the same element with the same atomic number.

[0003] There are many methods for separating and concentrating stable isotopes. In the early days, there were mainly thermal diffusion, electrolysis, laser, centrifugation and adsorption. Their production capacity was also on a small scale of hundreds of grams, and was mainly used for tracer applications in the research field. The vapor pressures of each isotope of an element and its compounds are different, and the isotopes can be separated by distillation. The separation factor of distillation is equal to the ratio of the pure vapor pressures of the two separated components, and increases with decreasing temperature and molecular weight. Because the distillation process is mature and the method is simple and reliable, some light isotopes are often produced by this method, such as low-temperature distillation. 1 H / 2 H. 16 O / 18 O. 12 C / 13 C. 14 N / 15 N. 10 B / 11 B and other light atomic weight isotopes.

[0004] However, in the existing isotope separation system, the system pipelines are relatively complex and the actual settings are relatively troublesome. There is no centralized treatment of waste materials, and the treatment method needs to be optimized. In addition, the liquid elements in the separation tower are subjected to low-temperature distillation separation, and the reduction is not replenished, so the distillation balance cannot be maintained. In addition, the isotope products also need to be processed.

[0005] Therefore, how to provide a system and method for optimizing system piping, centrally processing waste, maintaining distillation balance, and low-temperature separation and concentration of stable isotopes is an urgent problem to be solved by those skilled in the art. Summary of the invention

[0006] In view of this, the present invention provides a system and method for low-temperature separation and concentration of stable isotopes, aiming to solve one of the problems in the above-mentioned background technology, optimize system pipelines, centrally process waste materials, and maintain distillation balance.

[0007] In order to achieve the above object, on the one hand, the present invention provides a stable isotope low-temperature separation and enrichment system, comprising:

[0008] A separation tower, wherein a plurality of separation towers are provided, and each two of the separation towers are arranged in series, and the plurality of separation towers are arranged in communication, and each of the separation towers is provided with an upper air inlet, an upper air outlet, a lower liquid inlet, a bottom liquid inlet, a bottom liquid outlet and a feed inlet;

[0009] Condenser, wherein a plurality of condensers are provided, each of the condensers is respectively connected to two adjacent separation towers, the hot end of each condenser is connected to the upper gas outlet of the separation tower, and the cold end of each condenser is connected to the lower liquid inlet of another adjacent separation tower;

[0010] A first heat exchanger and a second heat exchanger, wherein the first heat exchanger is connected to a lower air inlet of the first separation tower, and the second heat exchanger is connected to an upper air outlet of the last separation tower through the condenser;

[0011] A reboiler, wherein a plurality of reboilers are provided, the cold end of each reboiler is connected to the bottom liquid outlet of the separation tower, the hot end of each reboiler is connected to the upper air inlet of the separation tower, the cold end of each reboiler is also connected to the bottom liquid inlet of another adjacent separation tower, and the bottom liquid outlet of the last separation tower is connected to the second heat exchanger through the reboiler.

[0012] Furthermore, it also includes a mixer, and the hot end of each condenser is connected to the mixer.

[0013] Furthermore, it also includes a raw material tank and a waste tank, the raw material tank is connected to the hot end of the first heat exchanger, the raw material tank is also connected to the mixer, an impurity adsorber is provided on the connecting pipeline between the raw material tank and the first heat exchanger, the impurity adsorber is connected to the waste tank, and the mixer is also connected to the waste tank.

[0014] Furthermore, it also includes a liquid raw material tank, which is connected to the feed port of each separation tower. A liquid stop valve is provided on the connecting pipeline between each separation tower and the liquid raw material tank, and the liquid stop valve is also provided on the pipeline connecting each condenser and the lower liquid inlet of the separation tower.

[0015] Furthermore, it also includes a pressure reducing valve, wherein a plurality of pressure reducing valves are provided, and each of the pressure reducing valves is respectively provided on a pipeline connecting the cold end of each of the reboilers with the bottom liquid outlet of the separation tower.

[0016] Furthermore, it also includes a stop valve, and a plurality of the stop valves are provided, each of the stop valves is respectively provided on the pipeline connecting each condenser and the mixer, and the stop valve is also provided on the pipeline connecting the first heat exchanger and the first separation tower.

[0017] Furthermore, it also includes an external cold source, which is arranged on the heat exchanger, and the entire system is cooled by the external cold source.

[0018] Furthermore, it also includes a vacuum pump, which is connected to the first separation tower.

[0019] Furthermore, it also includes a sampling pump, and a plurality of the sampling pumps are provided. The plurality of sampling pumps are respectively arranged on a pipeline connecting the cold end of each condenser with the lower liquid inlet of another adjacent separation tower and on a pipeline connecting the cold end of each reboiler with the bottom liquid inlet of another adjacent separation tower.

[0020] On the other hand, the present invention also provides a method for low-temperature separation and concentration of stable isotopes, comprising the following steps:

[0021] Step 1: vacuum all the separation towers and connecting pipelines connected in series by using a vacuum pump, cool the entire system by using an external cold source, and replenish liquid raw materials to the feed port of each separation tower through a liquid raw material tank;

[0022] Step 2: Provide raw materials through the raw material tank, enter the impurity adsorption tower to filter the raw materials, discharge the waste into the waste tank, and the filtered raw materials enter the first heat exchanger. Open the stop valve on the pipeline connecting the first heat exchanger and the lower air inlet of the first separation tower, and the raw materials are heated by the first heat exchanger and enter the first separation tower;

[0023] Step three, the raw material entering the first separation tower is treated and evaporated by the separation tower, enters the hot end of the condenser through the upper air outlet of the separation tower, and then is condensed into a liquid phase through the condenser and enters the lower liquid inlet of the next separation tower. The liquid raw material at the bottom of the first separation tower is depressurized by a pressure reducing valve and enters a reboiler for treatment. A part of it is heated and vaporized by the reboiler and returns to the original separation tower through the upper air inlet, and a part of the liquid phase enters the next separation tower through the bottom liquid inlet, that is, the condenser corresponding to each separation tower provides the initial liquid phase of the tower, and the reboiler corresponding to each separation tower provides the initial vapor phase of the tower. The vapor and liquid are in countercurrent contact in each separation tower, and the two processes of isotope exchange reforming and vapor-liquid distillation are continuously and alternately performed;

[0024] Step 4: Follow step 3 to circulate to the last separation tower. The gas phase in the separation tower enters the hot end of the condenser through the upper air outlet of the last separation tower, and then is condensed into liquid phase by the condenser and enters the second heat exchanger for treatment. The liquid phase in the separation tower enters the second heat exchanger for treatment through the reboiler. The second heat exchanger performs heat exchange treatment on the gas phase and the liquid phase to produce the product.

[0025] Step 5: In each condenser, the exhaust gases from the top of all separation towers are combined through a mixer, the raw materials are recovered into a raw material tank, the waste is discharged into a waste tank, and the liquid raw material tank is connected to the feed port of each separation tower to replenish the reduced liquid raw material at the bottom of the separation tower.

[0026] It can be seen from the above technical solutions that, compared with the prior art, the present invention discloses a system and method for low-temperature separation and concentration of stable isotopes, by arranging a plurality of separation towers in series.

[0027] Each condenser is connected to two adjacent separation towers, and each reboiler is connected to the separation tower and another adjacent separation tower. The cooperation between the reboiler and the condenser can save energy and simplify the process. Each separation tower can alternately realize the two processes of isotope exchange reforming and vapor-liquid distillation at the same time, thus overcoming the disadvantage of the single distillation function of the traditional isotope low-temperature separation tower. By setting the first heat exchanger, the raw materials can be processed to improve the separation and concentration efficiency of the isotopes. By setting the second heat exchanger, the isotope products can be processed, and the production and use are more reasonable. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0029] Figure 1 A schematic diagram of the structure of the stable isotope low-temperature separation and concentration system provided by the present invention;

[0030] Figure 2 The present invention provides a schematic structural diagram of a separation tower.

[0031] Among them: 1 is a separation tower; 101 is an upper air inlet; 102 is an upper air outlet; 103 is a lower liquid inlet; 104 is a bottom liquid inlet; 105 is a bottom liquid outlet; 106 is a feed inlet; 2 is a condenser; 3 is a first heat exchanger; 4 is a second heat exchanger; 5 is a reboiler; 6 is a mixer; 7 is a raw material tank; 8 is a waste tank; 9 is an impurity adsorber; 10 is a liquid raw material tank; 11 is a liquid stop valve; 12 is a pressure reducing valve; 13 is a stop valve; 14 is an external cold source; 15 is a vacuum pump; 16 is a sampling pump; 17 is a compressor; 18 is an oxygen isotope product outlet. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] See also Figure 1-2 The embodiment of the present invention discloses a stable isotope low-temperature separation and concentration system, comprising:

[0034] A separation tower 1, wherein a plurality of separation towers 1 are arranged, and each two separation towers 1 are arranged in series, and the plurality of separation towers 1 are arranged in communication, and each separation tower 1 is provided with an upper air inlet 101, an upper air outlet 102, a lower liquid inlet 103, a bottom liquid inlet 104, a bottom liquid outlet 105 and a feed inlet 106; the gaseous oxygen medium flowing upward and the liquid raw material medium flowing downward perform mass transfer and heat transfer exchange in the separation tower 1, and the isotope separation coefficient is small, so it is necessary to connect a plurality of separation towers 1 in series to improve the separation efficiency;

[0035] Condenser 2, multiple condensers 2 are provided, each condenser 2 is connected to two adjacent separation towers 1, the hot end of each condenser 2 is connected to the upper gas outlet 102 of the separation tower 1, and the cold end of each condenser 2 is connected to the lower liquid inlet 103 of another adjacent separation tower 1; the raw material is condensed and liquefied by the condenser 2 and then transferred to the next separation tower 1 to perform low-temperature distillation on the raw material; multiple condensers 2 are provided for separate operation, which is convenient for later replacement and improves separation efficiency;

[0036] The first heat exchanger 3 and the second heat exchanger 4, the first heat exchanger 3 is connected to the lower air inlet of the first separation tower 1, and the second heat exchanger 4 is connected to the upper air outlet 102 of the last separation tower 1 through the condenser 2; by setting the first heat exchanger 3, the raw material entering the first separation tower 1 is heated and then enters the separation tower 1, and the isotope product can be processed by the second heat exchanger 4, so that the production and use are more reasonable;

[0037] A reboiler 5, wherein a plurality of reboilers 5 are provided, a cold end of each reboiler 5 is communicated with a bottom liquid outlet 105 of the separation tower 1, a hot end of each reboiler 5 is communicated with an upper air inlet 101 of the separation tower 1, and a cold end of each reboiler 5 is also communicated with a bottom liquid inlet 104 of another adjacent separation tower 1, and a bottom liquid outlet 105 of the last separation tower 1 is communicated with the second heat exchanger 4 through the reboiler 5; the liquid raw material in the separation tower 1 is heated and vaporized by the reboiler 5 and then introduced back into the separation tower 1 for further separation, and the separation performance of the separation tower 1 is improved by the reboiler 5;

[0038] In this embodiment, a mixer 6 is also included, and the hot end of each condenser 2 is connected to the mixer 6; the exhaust gas at the top of the separation tower 1 is collected by the mixer 6 instead of being directly discharged into the atmosphere, which can effectively prevent the loss of gas isotopes during the distillation process and improve the isotope extraction rate; the waste material at the top of the separation tower 1 is recovered and separated by the mixer 6 to continue to participate in the distillation process.

[0039] In this embodiment, a raw material tank 7 and a waste tank 8 are also included. The raw material tank 7 is connected to the hot end of the first heat exchanger 3, and the raw material tank 7 is also connected to the mixer 6. An impurity adsorber 9 is provided on the connecting pipeline between the raw material tank 7 and the first heat exchanger 3. The impurity adsorber 9 is connected to the waste tank 8, and the mixer 6 is also connected to the waste tank 8. Raw materials are provided through the raw material tank 7, waste is recovered through the waste tank 8, and other elements in the raw materials are filtered through the impurity adsorber 9. It is easy to use and pollution-free.

[0040] In this embodiment, a liquid raw material tank 10 is further included, and the liquid raw material tank 10 is connected to the feed port 106 of each separation tower 1. A liquid stop valve 1311 is provided on the connecting pipeline between each separation tower 1 and the liquid raw material tank 10, and a liquid stop valve 1311 is also provided on the pipeline connecting each condenser 2 and the lower liquid inlet 103 of the separation tower 1; the liquid raw material tank 10 is connected to the feed port 106 of each separation tower 1 to supplement the reduced part of the liquid raw material at the bottom of the separation tower 1 to maintain the distillation balance.

[0041] In this embodiment, a pressure reducing valve 12 is also included. A plurality of pressure reducing valves 12 are provided, and each pressure reducing valve 12 is provided on a pipeline connecting the cold end of each reboiler 5 and the bottom liquid outlet 105 of the separation tower 1. By providing the pressure reducing valve 12, the supercooled liquid raw material is depressurized and enters the cold end of the reboiler 5 for treatment.

[0042] In this embodiment, a stop valve 13 is also included. A plurality of stop valves 13 are provided. Each stop valve 13 is respectively provided on a pipeline connecting each condenser 2 and the mixer 6. A stop valve 13 is also provided on a pipeline connecting the first heat exchanger 3 and the first separation tower 1. By providing a plurality of stop valves 13, it is convenient to open and close the connecting pipelines at a later time, and the use is convenient.

[0043] In this embodiment, an external cold source 14 is further included. The external cold source 14 is arranged on the heat exchanger, and the entire system is cooled by the external cold source 14. The entire system is cooled by the external cold source 14.

[0044] In this embodiment, a vacuum pump 15 is further included, and the vacuum pump 15 is connected to the first separation tower 1; the vacuum pump 15 is used for vacuuming to minimize heat transfer, achieve better insulation effect, and ensure that impurities in the connecting pipeline are completely removed.

[0045] In this embodiment, a sampling pump 16 is also included. A plurality of sampling pumps 16 are provided. The plurality of sampling pumps 16 are respectively provided on a pipeline connecting the cold end of each condenser 2 with the lower liquid inlet 103 of another adjacent separation tower 1 and on a pipeline connecting the cold end of each reboiler 5 with the bottom liquid inlet 104 of another adjacent separation tower 1; the gas or liquid phase is sampled and collected through the sampling pump 16.

[0046] On the other hand, the present invention also provides a method for low-temperature separation and concentration of stable isotopes, comprising the following steps:

[0047] Step 1: vacuum all the separation towers 1 and the connecting pipelines connected in series by means of a vacuum pump 15, cool the entire system by means of an external cold source 14, and replenish the liquid raw material to the feed port 106 of each separation tower 1 through the liquid raw material tank 10;

[0048] Step 2: provide raw materials through the raw material tank 7, enter the impurity adsorption tower to filter the raw materials, discharge the waste into the waste tank 8, and the filtered raw materials enter the first heat exchanger 3. Open the stop valve 13 on the pipeline connecting the first heat exchanger 3 and the lower air inlet of the first separation tower 1. The raw materials are heated by the first heat exchanger 3 and enter the first separation tower 1.

[0049] Step three, the raw material entering the first separation tower 1 is processed and evaporated by the separation tower 1, enters the hot end of the condenser 2 through the upper air outlet 102 of the separation tower 1, and then condensed into a liquid phase through the condenser 2 and enters the lower liquid inlet 103 of the next separation tower 1. The liquid raw material at the bottom of the first separation tower 1 is depressurized by the pressure reducing valve 12 and enters the reboiler 5 for treatment. A part of it is heated and vaporized by the reboiler 5 and returns to the original separation tower 1 through the upper air inlet 101, and a part of the liquid phase enters the next separation tower 1 through the bottom liquid inlet 104, that is, the condenser 2 corresponding to each separation tower 1 provides the initial liquid phase of the tower, and the reboiler 5 corresponding to each separation tower 1 provides the initial vapor phase of the tower. The vapor and liquid are in countercurrent contact in each separation tower 1, and the two processes of isotope exchange reforming and vapor-liquid distillation are continuously and alternately performed;

[0050] Step 4: circulate to the last separation tower 1 according to step 3, the gas phase in the separation tower 1 enters the hot end of the condenser 2 through the upper gas outlet 102 of the last separation tower 1, and then is condensed into a liquid phase by the condenser 2 and enters the second heat exchanger 4 for treatment. The liquid phase in the separation tower 1 enters the second heat exchanger 4 for treatment through the reboiler 5, and the second heat exchanger 4 performs heat exchange treatment on the gas phase and the liquid phase to produce a product.

[0051] Step 5: In each condenser 2, the exhaust gases from the tops of all separation towers 1 are combined through the mixer 6, the raw materials are recovered into the raw material tank 7, the waste materials are discharged into the waste tank 8, and the liquid raw material tank 10 is connected with the feed port 106 of each separation tower 1 to replenish the reduced portion of the liquid raw material at the bottom of the separation tower 1.

[0052] In addition, in this embodiment, the number of separation towers 1 can be increased or decreased according to demand, and every two separation towers 1 are connected to each other.

[0053] The system further comprises a compressor 17, through which the isotope product in the second heat exchanger 5 is compressed and recovered.

[0054] It also includes an isotope product outlet 18, which is arranged at the hot end of the second heat exchanger 5 to achieve the recovery of the isotope product.

[0055] The outer surface of the side wall of the separation tower 1 is covered with multiple layers of polyurethane sprayed aluminum film layers, which can effectively reduce radiation heat transfer and improve distillation efficiency.

[0056] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the system disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0057] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A stable isotope low temperature separation and concentration system, characterized in that: include: A separation tower, wherein a plurality of separation towers are provided, and each two of the separation towers are arranged in series, and the plurality of separation towers are arranged in communication, and each of the separation towers is provided with an upper air inlet, an upper air outlet, a lower liquid inlet, a bottom liquid inlet, a bottom liquid outlet and a feed inlet; Condenser, wherein a plurality of condensers are provided, each of the condensers is respectively connected to two adjacent separation towers, the hot end of each condenser is connected to the upper gas outlet of the separation tower, and the cold end of each condenser is connected to the lower liquid inlet of another adjacent separation tower; A first heat exchanger and a second heat exchanger, wherein the first heat exchanger is connected to a lower air inlet of the first separation tower, and the second heat exchanger is connected to an upper air outlet of the last separation tower through the condenser; A reboiler, wherein a plurality of reboilers are provided, the cold end of each reboiler is connected to the bottom liquid outlet of the separation tower, the hot end of each reboiler is connected to the upper air inlet of the separation tower, the cold end of each reboiler is also connected to the bottom liquid inlet of another adjacent separation tower, and the bottom liquid outlet of the last separation tower is connected to the second heat exchanger through the reboiler.

2. A stable isotope low-temperature separation and enrichment system according to claim 1, characterized in that: A mixer is also included, and the hot end of each of the condensers is communicated with the mixer.

3. A stable isotope low-temperature separation and enrichment system according to claim 2, characterized in that: It also includes a raw material tank and a waste tank, the raw material tank is connected to the hot end of the first heat exchanger, the raw material tank is also connected to the mixer, an impurity adsorber is provided on the connecting pipeline between the raw material tank and the first heat exchanger, the impurity adsorber is connected to the waste tank, and the mixer is also connected to the waste tank.

4. A stable isotope low-temperature separation and enrichment system according to claim 3, characterized in that: It also includes a liquid raw material tank, which is connected to the feed port of each separation tower. A liquid stop valve is provided on the connecting pipeline between each separation tower and the liquid raw material tank, and the liquid stop valve is also provided on the pipeline connecting each condenser and the lower liquid inlet of the separation tower.

5. The stable isotope low-temperature separation and enrichment system according to claim 4, characterized in that: It also includes a pressure reducing valve, wherein a plurality of pressure reducing valves are provided, and each of the pressure reducing valves is respectively provided on a pipeline connecting the cold end of each of the reboilers and the bottom liquid outlet of the separation tower.

6. The stable isotope low-temperature separation and enrichment system according to claim 5, characterized in that: It also includes a stop valve, and a plurality of the stop valves are provided, each of which is respectively provided on a pipeline connecting each condenser and the mixer, and the stop valve is also provided on a pipeline connecting the first heat exchanger and the first separation tower.

7. The stable isotope low-temperature separation and enrichment system according to claim 6, characterized in that: It also includes an external cold source, which is arranged on the heat exchanger and cools the entire system through the external cold source.

8. The stable isotope low-temperature separation and enrichment system according to claim 7, characterized in that: Also included is a vacuum pump, which is connected to the first separation tower.

9. The stable isotope low-temperature separation and enrichment system according to claim 8, characterized in that: It also includes a sampling pump, and a plurality of the sampling pumps are respectively arranged on a pipeline connecting the cold end of each condenser with the lower liquid inlet of another adjacent separation tower and on a pipeline connecting the cold end of each reboiler with the bottom liquid inlet of another adjacent separation tower.

10. A stable isotope low-temperature separation and concentration method according to claim 9, characterized in that: The following steps are involved: Step 1: vacuum all the separation towers and connecting pipelines connected in series by using a vacuum pump, cool the entire system by using an external cold source, and replenish liquid raw materials to the feed port of each separation tower through a liquid raw material tank; Step 2: Provide raw materials through the raw material tank, enter the impurity adsorption tower to filter the raw materials, discharge the waste into the waste tank, and the filtered raw materials enter the first heat exchanger. Open the stop valve on the pipeline connecting the first heat exchanger and the lower air inlet of the first separation tower, and the raw materials are heated by the first heat exchanger and enter the first separation tower; Step three, the raw material entering the first separation tower is treated and evaporated by the separation tower, enters the hot end of the condenser through the upper air outlet of the separation tower, and then is condensed into a liquid phase through the condenser and enters the lower liquid inlet of the next separation tower. The liquid raw material at the bottom of the first separation tower is depressurized by a pressure reducing valve and enters a reboiler for treatment. A part of it is heated and vaporized by the reboiler and returns to the original separation tower through the upper air inlet, and a part of the liquid phase enters the next separation tower through the bottom liquid inlet, that is, the condenser corresponding to each separation tower provides the initial liquid phase of the tower, and the reboiler corresponding to each separation tower provides the initial vapor phase of the tower. The vapor and liquid are in countercurrent contact in each separation tower, and the two processes of isotope exchange reforming and vapor-liquid distillation are continuously and alternately performed; Step 4: According to step 3, the gas phase in the separation tower enters the hot end of the condenser through the upper gas outlet of the last separation tower, and then is condensed into a liquid phase by the condenser and enters the second heat exchanger for treatment. The liquid phase in the separation tower enters the second heat exchanger for treatment through the reboiler. The second heat exchanger performs heat exchange treatment on the gas phase and the liquid phase to produce the product; Step 5: In each condenser, the exhaust gases from the top of all separation towers are combined through a mixer, the raw materials are recovered into a raw material tank, the waste is discharged into a waste tank, and the liquid raw material tank is connected to the feed port of each separation tower to replenish the reduced liquid raw material at the bottom of the separation tower.

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