CN115957527B - Efficient production of Na131Device for I solution - Google Patents

Abstract

The invention discloses a device for efficiently producing Na ¹³¹ I solution, which comprises a tubular furnace, a distiller, a purifier, a cold water bath, an air storage tank, a peristaltic pump, an air pump and a rack. The tubular furnace level set up on the mesa of rack, still a part sets up in the tubular furnace, another part sets up under the mesa, the aspiration pump is fixed to be set up under the mesa, clarifier, cold water bath, gas holder set up respectively on the bottom plate of distiller side rack, peristaltic pump is fixed to be set up in one side of rack, the distiller is connected with clarifier, cold water bath, gas holder, aspiration pump and peristaltic pump pipeline respectively, the aspiration pump still is connected with the clarifier pipeline. The production device adopts a mode of compressed air driving to replace a vacuum pump and high-temperature gas to heat carrier gas transportation in the whole process, realizes efficient absorption of radioactive iodine-131 in the high-temperature carrier gas, eliminates the influence of vacuum pump faults on production and the generation of pump related radioactive wastes, and is more beneficial to safe production.

Description

A device for efficiently producing Na131I solution

Technical Field

The invention belongs to the technical field of radioisotope preparation, and in particular relates to a device for efficiently producing Na ¹³¹ I solution.

Background Art

The radioactive raw materials of sodium iodide ( ^131I -NaI) drugs and iodine-131 labeled drugs used in medical institutions mainly come from tellurium dioxide activated by reactor irradiation, and are mainly produced by dry distillation. In addition to the Institute of Nuclear Physics and Chemistry of the China Academy of Engineering Physics, the domestic China Institute of Atomic Energy and China Nuclear Power Research Institute have both been engaged in iodine-131 dry distillation production and established production equipment. However, the existing production technology has the problem that iodine-131 distilled from the target material is easy to deposit or stay on the inner wall of the pipeline during the carrier gas carrier transport process, especially in the exposed pipeline connecting the absorption bottle and the low temperature, resulting in low product yield, long production time and other problems, which is not conducive to improving production efficiency, and the vacuum pump used in production needs to be regularly maintained or replaced, which inevitably increases the radiation dose of the staff and the replacement of the waste vacuum pump or the generation of radioactive waste related to its maintenance. At present, there is no public report on the efficient production of ^Na131I solution device with heating and insulation throughout the whole process of distilling the carrier gas carrier transport process containing iodine-131 and using compressed air to drive the carrier gas transport.

Summary of the invention

In order to overcome the shortcomings of the prior art that iodine-131 distilled from the target material is easily deposited or retained on the inner wall of the pipeline during the carrier gas transport process, resulting in low product yield, long production time and increased radiation risk for workers, and to achieve the purpose of further improving production efficiency, the present invention provides a device for efficiently producing Na ¹³¹ I solution, which can efficiently absorb radioactive iodine-131 in the carrier gas and completely eliminate the impact of vacuum pump failure on production, the radiation dose received by workers during regular maintenance or replacement of vacuum pumps, and the generation of radioactive waste related to the replacement of used vacuum pumps or their maintenance.

The technical solution for implementing the present invention is as follows:

The invention discloses a device for efficiently producing ^Na131I solution, which is characterized in that the device comprises a tubular furnace, a distiller, a purifier, a cold water bath, a gas storage tank, a peristaltic pump, an air pump and a stand, and the connection relationship is that the tubular furnace is horizontally arranged on the table top of the stand, a part ^of the distiller is arranged in the tubular furnace, and the other part is arranged under the table top, the air pump is fixedly arranged under the table top, the purifier, the cold water bath and the gas storage tank are respectively arranged on the bottom plate of the stand on the side of the distiller, the peristaltic pump is fixedly arranged on one side of the stand, the distiller is respectively connected with the purifier, the cold water bath, the gas storage tank, the air pump and the peristaltic pump pipeline, and the air pump is also connected with the purifier pipeline.

The distiller comprises a distillation tube, an absorption bottle, a stopper, a quartz boat and a heat-conducting tube with a coil structure; the distillation tube is horizontally arranged in the furnace cavity of the tubular furnace, the absorption bottle is arranged just below the distillation tube near the bottom, the top of the absorption bottle penetrates into the distillation tube and is sealed and fixedly connected to the distillation tube, the stopper is arranged in the tube mouth of the distillation tube and is connected to the distillation tube with an airtight ground mouth, the heat-conducting tube is arranged in the distillation tube between the absorption bottle and the bottom of the distillation tube, the two ends of the heat-conducting tube respectively pass through the bottom center of the distillation tube and penetrate into the top of the absorption bottle and are sealed and fixedly connected to the distillation tube and the absorption bottle, and the quartz boat is arranged in the distillation tube between the stopper and the absorption bottle.

The absorption bottle comprises a vent pipe, an air heating sleeve, an insulating sleeve, an alkali liquid bottle, a water-cooled cone sleeve, a temperature measuring sleeve, a feeding pipe, an exhaust pipe I and an exhaust pipe II; the vent pipe, the air heating sleeve, the insulating sleeve and the alkali liquid bottle are arranged vertically in sequence from the inside to the outside, wherein the upper end of the vent pipe is conical and the lower end is a bell mouth, the outer shape of the air heating sleeve is cylindrical, the outer shape of the insulating sleeve is a double-layer barrel with a circular hole arranged in the center of the bottom, the outer shape of the alkali liquid bottle is a barrel with a closed top, and the water-cooled cone sleeve is a conical coil structure; the vent pipe passes through the air heating sleeve and is sealed and fixedly connected to both ends of the air heating sleeve, the bell mouth at the lower end of the vent pipe is embedded in the circular hole of the insulating sleeve and is sealed and fixedly connected to the circular hole surface, the upper end surface of the alkali liquid bottle is sealed and fixedly connected to the outer side surface of the upper part of the insulating sleeve, and a gap is arranged between the alkali liquid bottle and the bottom of the insulating sleeve; the water-cooled cone sleeve The sleeve is arranged between the bell mouth of the vent pipe and the bottom of the alkali liquid bottle, most of the upper end of the water-cooling cone sleeve extends into the bell mouth and maintains a small gap with the inner surface of the bell mouth, the inlet and outlet water pipes at the lower end of the water-cooling cone sleeve pass downward through the bottom of the alkali liquid bottle and are fixedly connected to the alkali liquid bottle in a sealed manner, and the inlet and outlet water pipes at the lower end of the water-cooling cone sleeve are connected to the cold water bath pipeline; the temperature measuring sleeve vertically passes through the bottom of the alkali liquid bottle and the center of the water-cooling cone sleeve in turn and extends into the straight pipe at the lower part of the vent pipe, the temperature measuring sleeve is fixedly connected to the bottom of the alkali liquid bottle in a sealed manner, and a thermocouple is arranged in the temperature measuring sleeve; the exhaust pipe II is arranged on the upper side of the air heating sleeve, and the exhaust pipe II is connected to the exhaust pump pipeline; the feeding pipe and the exhaust pipe I are respectively fixedly arranged on both sides of the upper part of the alkali liquid bottle, a valve I is fixedly arranged on the feeding pipe, the feeding pipe is connected to the peristaltic pump through a hose, and a liquid storage bottle is arranged on the bottom plate below the peristaltic pump.

The purifier comprises an iodine removal bottle, a cold trap and an activated carbon column which are sequentially connected by pipelines. A valve III is arranged on the air inlet pipeline of the iodine removal bottle. The iodine removal bottle is connected to an exhaust pipe I pipeline, and the activated carbon column is connected to an air pump pipeline.

The gas storage tank is fixedly provided with an inlet and outlet pipe and a pressure gauge, a valve II is fixedly provided on the outlet pipe, the outlet pipe of the gas storage tank is connected to one end of the heat transfer pipe passing through the bottom center of the distillation pipe, and the inlet pipe of the gas storage tank is externally connected to an air compressor.

The tubular furnace, cold water bath, peristaltic pump and thermocouple are connected to an external controller.

Preferably, the longitudinal axis center lines of the ventilation pipe, the gas heating sleeve, the insulation sleeve, the alkali solution bottle, and the temperature measuring sleeve coincide with each other and intersect perpendicularly with the horizontal axis center line of the distillation tube.

Preferably, the distillation tube, ventilation tube, gas heating sleeve, insulation sleeve, alkali solution bottle, water cooling cone sleeve, temperature measuring sleeve, feeding tube, exhaust pipe I, exhaust pipe II, stopper, and heat conducting pipe are all made of quartz glass; the insulation sleeve is filled with asbestos fiber or evacuated.

The invention discloses a highly efficient device for producing Na ¹³¹ I solution. The device uses the negative pressure generated by the rapid injection of compressed air in the vacuum pump to drive the airborne radioactive iodine-131 to be transported from the distillation tube to the absorption bottle. The method of heat-insulating the airborne iodine-131 transport pipeline with high-temperature gas is implemented to achieve highly efficient absorption of the airborne radioactive iodine-131 distilled from the furnace tube. The brief working principle is as follows: the compressed air is input into the distillation device from the heat-conducting tube and then discharged from the vacuum pump through the gas heating sleeve. When the air flow is heated to a high temperature in the heat-conducting tube and then passes through the gas heating sleeve, the ventilation pipe is continuously heated and insulated to keep the carrier gas containing radioactive iodine-131 generated in the distillation tube from flowing through the ventilation pipe before contacting the absorption liquid (generally a dilute sodium hydroxide solution) in the alkali liquid bottle. The temperature is kept above 200°C during transportation, thereby reducing the deposition or retention of iodine-131 on the inner wall of the transportation pipeline; the compressed air is quickly ejected from the vacuum pump to generate a high negative pressure in the pump cavity and is transferred to the distillation tube through the activated carbon column, cold trap, iodine removal bottle, exhaust pipe I, alkali solution bottle, and ventilation pipe in sequence. The negative pressure drives the radioactive iodine-131 gas generated in the distillation tube to enter the alkali solution bottle through the ventilation pipe under the carrier gas. The high-temperature carrier gas is quickly cooled by the water-cooled cone sleeve placed in the bell mouth of the ventilation pipe. The airborne radioactive iodine-131 gas is absorbed by the absorption liquid filled in the alkali solution bottle. The tail gas treated by the alkali solution bottle is discharged from the vacuum pump through the exhaust pipe I, iodine removal bottle, cold trap, and activated carbon column in sequence, thereby realizing the efficient production of Na ¹³¹ I solution.

The device for efficiently producing ^Na131I solution of the present invention adopts a vertical structural layout, which eliminates the disadvantages of the traditional technology that the connecting pipeline is long, the pipeline needs to be bent at multiple places, and the whole-process insulation of the carrier gas cannot be achieved. The vacuum pump used in the prior art needs to be regularly maintained or replaced, which can avoid the unfavorable factors such as increased radiation dose of workers and replacement of waste vacuum pumps or generation and disposal of radioactive waste related to their maintenance, thereby greatly improving production efficiency and having good operation stability and safety.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic structural diagram of a device for efficiently producing Na ¹³¹ I solution according to the present invention.

In the figure, 1. distillation tube; 2. tubular furnace; 3. ventilation pipe; 4. gas heating sleeve; 5. insulation sleeve; 6. alkali solution bottle; 7. water-cooling cone sleeve; 8. temperature measuring sleeve; 9. feeding pipe; 10. exhaust pipe I; 11. thermocouple; 12. exhaust pipe II; 13. plug; 14. heat transfer pipe; 15. vacuum pump; 16 cold water bath; 17. gas storage tank; 18. peristaltic pump; 19. pressure gauge; 20. liquid storage bottle; 21. valve I; 22. valve II; 23. valve III; 24. iodine removal bottle; 25. cold trap; 26. activated carbon column; 27. quartz boat; 28. table; 29 bottom plate.

DETAILED DESCRIPTION

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without any creative labor.

In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific implementation methods and drawings.

Example 1

FIG1 is a schematic diagram of the structure of a device for efficiently producing Na ¹³¹ I solution of the present invention. In FIG1, a device for efficiently producing Na ¹³¹ I solution of the present invention comprises a tubular furnace 2, a distiller, a purifier, a cold water bath 16, a gas storage tank 17, a peristaltic pump 18, an air pump 15 and a stand, wherein the connection relationship is that the tubular furnace 2 is horizontally arranged on a table 28 of the stand, a part of the distiller is arranged in the tubular furnace 2, and another part is arranged under the table 28, the air pump 15 is fixedly arranged under the table 28, the purifier, the cold water bath 16, and the gas storage tank 17 are respectively arranged on the bottom plate 29 of the stand on the side of the distiller, the peristaltic pump 18 is fixedly arranged on one side of the stand, the distiller is respectively connected to the purifier, the cold water bath 16, the gas storage tank 17, the air pump 15 and the peristaltic pump 18 by pipelines, and the air pump 15 is also connected to the purifier pipeline. See FIG1.

The distiller comprises a distillation tube 1, an absorption bottle, a stopper 13, a quartz boat 27 and a heat-conducting tube 14 of a coil structure; the distillation tube 1 is horizontally arranged in the furnace chamber of the tube furnace 2, the absorption bottle is arranged just below the distillation tube 1 near the bottom, the top of the absorption bottle penetrates into the distillation tube 1 and is sealed and fixedly connected to the distillation tube 1, the stopper 13 is arranged in the tube mouth of the distillation tube 1 and is connected to the distillation tube 1 with an airtight ground mouth, the heat-conducting tube 14 is arranged in the distillation tube 1 between the absorption bottle and the bottom of the distillation tube 1, the two ends of the heat-conducting tube 14 respectively pass through the bottom center of the distillation tube 1 and penetrate into the top of the absorption bottle and are sealed and fixedly connected to the distillation tube 1 and the absorption bottle, and the quartz boat 27 is arranged in the distillation tube 1 between the stopper 13 and the absorption bottle. See Figure 1.

The absorption bottle comprises a vent pipe 3, an air heating sleeve 4, an insulating sleeve 5, an alkali solution bottle 6, a water cooling cone sleeve 7, a temperature measuring sleeve 8, a feeding pipe 9, an exhaust pipe I 10 and an exhaust pipe II 12; the vent pipe 3, the air heating sleeve 4, the insulating sleeve 5 and the alkali solution bottle 6 are arranged vertically in sequence from the inside to the outside, wherein the upper end of the vent pipe 3 is conical and the lower end is a bell mouth, the outer shape of the air heating sleeve 4 is cylindrical, the outer shape of the insulating sleeve 5 is a double-layer barrel with a circular hole in the center of the bottom, and the alkali solution The shape of the bottle 6 is a cylindrical shape with a closed top, and the water-cooling cone sleeve 7 is a conical coil structure; the ventilation pipe 3 passes through the gas heating sleeve 4 and is sealed and fixedly connected to both ends of the gas heating sleeve 4, the bell mouth at the lower end of the ventilation pipe 3 is embedded in the circular hole of the insulation sleeve 5 and is sealed and fixedly connected to the circular hole surface, the upper end surface of the alkali solution bottle 6 is sealed and fixedly connected to the upper outer side surface of the insulation sleeve 5, and a gap is provided between the alkali solution bottle 6 and the bottom of the insulation sleeve 5; the water-cooling cone sleeve 7 is arranged on the ventilation pipe 3 and the bottom of the alkali liquid bottle 6, most of the upper end of the water-cooling cone sleeve 7 extends into the bell mouth and maintains a small gap with the inner surface of the bell mouth, the inlet and outlet water pipes at the lower end of the water-cooling cone sleeve 7 pass downward through the bottom of the alkali liquid bottle 6 and are sealed and fixedly connected to the alkali liquid bottle 6, and the inlet and outlet water pipes at the lower end of the water-cooling cone sleeve 7 are connected to the cold water bath (16) pipeline; the temperature measuring sleeve 8 vertically upward passes through the bottom of the alkali liquid bottle 6 and the center of the water-cooling cone sleeve 7 in turn and extends into the straight pipe at the lower part of the ventilation pipe 3, and the temperature measuring sleeve 8 It is sealed and fixedly connected to the bottom of the alkali liquid bottle 6, and a thermocouple 11 is arranged in the temperature measuring sleeve 8; the exhaust pipe II 12 is arranged on the upper side of the gas heating sleeve 4, and the exhaust pipe II 12 is connected to the vacuum pump 15 pipeline; the feeding pipe 9 and the exhaust pipe I 10 are respectively fixedly arranged on both sides of the upper part of the alkali liquid bottle 6, and a valve I 21 is fixedly arranged on the feeding pipe 9, and the feeding pipe 9 is connected to the peristaltic pump 18 through a hose, and a liquid storage bottle 20 is arranged on the bottom plate 29 below the peristaltic pump 18. See Figure 1.

The purifier includes an iodine removal bottle 24, a cold trap 25 and an activated carbon column 26 connected in sequence by pipelines. A valve III 23 is provided on the air inlet pipeline of the iodine removal bottle 24. The iodine removal bottle 24 is connected to the exhaust pipe I 10 by pipeline, and the activated carbon column 26 is connected to the vacuum pump 15 by pipeline. The air inlet and outlet pipes and a pressure gauge 19 are fixedly provided on the air storage tank 17, and a valve II 22 is fixedly provided on the air outlet pipe. The air outlet pipe of the air storage tank 17 is connected to one end of the heat conducting pipe 14 passing through the bottom center of the distillation tube 1, and the air inlet pipe of the air storage tank 17 is externally connected to an air compressor. See Figure 1.

The tubular furnace 2, cold water bath 16, peristaltic pump 18 and thermocouple 11 are connected to an external controller. The longitudinal axis of the ventilation pipe 3, gas heating sleeve 4, insulation sleeve 5, alkali solution bottle 6 and temperature measuring sleeve 8 coincide and vertically intersect with the horizontal axis of the distillation pipe 1. The distillation pipe 1, ventilation pipe 3, gas heating sleeve 4, insulation sleeve 5, alkali solution bottle 6, water cooling cone sleeve 7, temperature measuring sleeve 8, feeding pipe 9, exhaust pipe I 10, exhaust pipe II 12, plug 13 and heat conducting pipe 14 are all made of quartz glass; the insulation sleeve 5 is filled with asbestos fiber. See Figure 1.

The working process of the present invention is as follows: turn on the controller, start the peristaltic pump 18 in sequence to quantitatively add the absorption liquid to the alkali liquid bottle 6 through the feeding pipe 9, start the cold water bath 16 to inject cold water into the water-cooled cone sleeve 7, start the air compressor to inject compressed air into the gas storage tank 17 and connect the heat pipe 14, start the tubular furnace 2 to heat the distillation tube 1, and connect the thermocouple 11 to implement temperature monitoring. The compressed air is input into the distiller from the heat pipe 14, flows through the gas heating sleeve 4, the exhaust pipe II 12 in sequence, and finally is quickly ejected from the vacuum pump 2, thereby generating a high negative pressure in the inner cavity of the vacuum pump 2, and is sequentially transmitted to the distillation tube 1 through the activated carbon column 26, the cold trap 25, the iodine removal bottle 24, the exhaust pipe I 10, the alkali liquid bottle 6, and the ventilation pipe 3. The distillation tube 1 is heated to about 750°C and kept at a constant temperature, and the air flowing through the heat conducting tube 14 is heated to a high temperature at the same time. The iodine-131 carrier gas distilled from the target material in the quartz boat 27 passes through the ventilation tube 3, the gas heating sleeve 4, the alkali solution bottle 6, the exhaust pipe I10, the iodine removal bottle 24, the cold trap 25, the activated carbon column 26 in sequence under the drive of negative pressure and is finally discharged from the vacuum pump 2. When the high-temperature air in the heat conducting tube 14 flows through the gas heating sleeve 4, the ventilation tube 3 is continuously heated to keep the carrier gas containing radioactive iodine-131 flowing through the ventilation tube 3 at more than 200°C during the transportation process in the tube, thereby reducing the deposition or retention of iodine-131 on the inner wall of the pipeline. During this transportation process, the high-temperature carrier gas is first heated and insulated by the gas heating sleeve 4, then quickly cooled by the water-cooling cone sleeve 7 placed in the bell mouth of the ventilation pipe and absorbed by the absorption liquid (generally a dilute sodium hydroxide solution) filled in the alkali solution bottle 6, and finally purified by the iodine removal bottle 24, the cold trap 25, and the activated carbon column 26 in sequence to achieve efficient production of Na ¹³¹ I solution.

Example 2

The structure of this embodiment is the same as that of the embodiment 1, except that the interior of the heat insulating sleeve 5 in this embodiment is vacuum.

Claims (4)

1. A device for efficiently producing Na ¹³¹ I solution is characterized in that: the device for efficiently producing the Na131I solution comprises a tubular furnace (2), a distiller, a purifier, a cold water bath (16), an air storage tank (17), a peristaltic pump (18), an air pump (15) and a bench, wherein the tubular furnace (2) is horizontally arranged on a table top (28) of the bench, one part of the distiller is arranged in the tubular furnace (2), the other part of the distiller is arranged below the table top (28), the air pump (15) is fixedly arranged below the table top (28), the purifier, the cold water bath (16) and the air storage tank (17) are respectively arranged on a bottom plate (29) of the bench on the side surface of the distiller, the peristaltic pump (18) is fixedly arranged on one side of the bench, and the distiller is respectively connected with the purifier, the cold water bath (16), the air storage tank (17), the air pump (15) and the peristaltic pump (18) through pipelines, and the air pump (15) is also connected with the purifier through pipelines;

the distiller comprises a distillation tube (1), an absorption bottle, a plug (13), a quartz boat (27) and a heat conduction tube (14) with a coil structure; the distillation tube (1) is horizontally arranged in the furnace chamber of the tube furnace (2), the absorption bottle is arranged under the position, close to the bottom, of the distillation tube (1), the top of the absorption bottle penetrates into the distillation tube (1) and is fixedly connected with the distillation tube (1) in a sealing way, the plug (13) is arranged in the tube orifice of the distillation tube (1) and is connected with the airtight grinding port of the distillation tube (1), the heat conduction tube (14) is arranged in the distillation tube (1) between the absorption bottle and the bottom of the distillation tube (1), the two ends of the heat conduction tube (14) respectively penetrate out of the center of the bottom of the distillation tube (1) and penetrate into the top of the absorption bottle and are fixedly connected with the distillation tube (1) and the absorption bottle in a sealing way, and the quartz boat (27) is arranged in the distillation tube (1) between the plug (13) and the absorption bottle;

The absorption bottle comprises a vent pipe (3), an air heating sleeve (4), a heat insulation sleeve (5), an alkali liquor bottle (6), a water cooling taper sleeve (7), a temperature measuring sleeve (8), a feeding pipe (9), an exhaust pipe I (10) and an exhaust pipe II (12); the air pipe (3), the air heating sleeve (4), the heat insulation sleeve (5) and the alkali liquor bottle (6) are sequentially arranged vertically from inside to outside, wherein the upper end of the air pipe (3) is conical, the lower end of the air heating sleeve is a bell mouth, the appearance of the air heating sleeve (4) is cylindrical, the appearance of the heat insulation sleeve (5) is double-layer cylindrical with a round hole arranged at the center of the bottom, the appearance of the alkali liquor bottle (6) is cylindrical with a closed top, and the water cooling taper sleeve (7) is a conical coil structure; the vent pipe (3) penetrates through the air heating sleeve (4) and is fixedly connected with two ends of the air heating sleeve (4) in a sealing manner, a horn mouth at the lower end of the vent pipe (3) is embedded into a round hole of the heat insulation sleeve (5) and is fixedly connected with a round hole surface in a sealing manner, the upper end face of the alkali liquor bottle (6) is fixedly connected with the outer side face of the upper part of the heat insulation sleeve (5) in a sealing manner, and a gap is formed between the alkali liquor bottle (6) and the bottom of the heat insulation sleeve (5); the water-cooling taper sleeve (7) is arranged between the bell mouth of the vent pipe (3) and the bottom of the alkali liquor bottle (6), the water-cooling taper sleeve (7) is positioned in the bell mouth and keeps a small gap with the inner surface of the bell mouth, the water inlet and outlet pipe at the lower end of the water-cooling taper sleeve (7) downwards penetrates out of the bottom of the alkali liquor bottle (6) and is fixedly connected with the sealing property of the alkali liquor bottle (6), and the water inlet and outlet pipe at the lower end of the water-cooling taper sleeve (7) is connected with a cold water bath (16) through a pipeline; the temperature measuring sleeve (8) vertically and upwards penetrates through the bottom of the alkali liquor bottle (6) and the center of the water-cooling taper sleeve (7) in sequence and stretches into a straight pipe at the lower part of the vent pipe (3), the temperature measuring sleeve (8) is fixedly connected with the bottom of the alkali liquor bottle (6) in a sealing manner, and a thermocouple (11) is arranged in the temperature measuring sleeve (8); the exhaust pipe II (12) is arranged on the side surface of the upper part of the air heating sleeve (4), and the exhaust pipe II (12) is connected with the air pump (15) in a pipeline manner; the feeding pipe (9) and the exhaust pipe I (10) are respectively and fixedly arranged at two sides of the upper part of the alkali liquor bottle (6), a valve I (21) is fixedly arranged on the feeding pipe (9), the feeding pipe (9) is connected with the peristaltic pump (18) through a hose, and a liquid storage bottle (20) is arranged on a bottom plate (29) below the peristaltic pump (18);

The purifier comprises an iodine removing bottle (24), a cold trap (25) and an activated carbon column (26) which are sequentially connected in a pipeline way, a valve III (23) is arranged on an air inlet pipeline of the iodine removing bottle (24), the iodine removing bottle (24) is connected with an exhaust pipe I (10) in a pipeline way, and the activated carbon column (26) is connected with an air extracting pump (15) in a pipeline way;

Compressed air is input into the distiller from the heat conduction pipe (14), flows through the air heating sleeve (4) and the exhaust pipe II (12) in sequence and finally is rapidly ejected from the air pump (2), so that higher negative pressure is generated in the inner cavity of the air pump (2), and sequentially passes through the activated carbon column (26), the cold trap (25), the iodine removal bottle (24), the exhaust pipe I (10), the alkali liquor bottle (6) and the air pipe (3), is transmitted into the distillation pipe (1), and iodine-131 carrier gas distilled from target materials in the quartz boat (27) sequentially passes through the air pipe (3), the air heating sleeve (4), the alkali liquor bottle (6), the exhaust pipe I (10), the iodine removal bottle (24), the cold trap (25), the activated carbon column (26) and is finally discharged from the air pump (2) under the negative pressure driving; an air inlet and outlet pipe and a pressure gauge (19) are fixedly arranged on the air storage tank (17), a valve II (22) is fixedly arranged on an air outlet pipe, the air outlet pipe of the air storage tank (17) is connected with one end of the heat conducting pipe (14) penetrating out of the center of the bottom of the distillation pipe (1), and the air inlet pipe of the air storage tank (17) is externally connected with an air compressor;

The tube furnace (2), the cold water bath (16), the peristaltic pump (18) and the thermocouple (11) are externally connected with a controller.

2. The apparatus for efficiently producing Na ¹³¹ I solution according to claim 1, wherein: the longitudinal axis lines of the vent pipe (3), the air heating sleeve (4), the heat insulation sleeve (5), the alkali liquor bottle (6) and the temperature measurement sleeve (8) are overlapped and vertically crossed with the horizontal axis line of the distillation pipe (1).

3. The apparatus for efficiently producing Na ¹³¹ I solution according to claim 1, wherein: the distillation tube (1), the vent tube (3), the gas heating sleeve (4), the heat insulation sleeve (5), the alkali liquor bottle (6), the water cooling taper sleeve (7), the temperature measuring sleeve (8), the feeding tube (9), the exhaust tube I (10), the exhaust tube II (12), the plug (13) and the heat conducting tube (14) are all made of quartz glass; asbestos fibers are filled in the heat insulation sleeve (5) or vacuum is pumped.

4. The apparatus for efficiently producing Na ¹³¹ I solution according to claim 1, wherein: the U-shaped pipe (12) extends in the gas heating sleeve (4) to the bottom of the gas heating sleeve (4).