Distillation device for purifying high-purity nitric acid

Abstract

The utility model relates to the field of distillation devices for purifying high-purity nitric acid, and discloses a distillation device for purifying high-purity nitric acid, which comprises a first-stage distillation mechanism, a first-stage condensation mechanism, a second-stage distillation mechanism and a second-stage condensation mechanism, a first heating plate is arranged in the middle of the interior of the first-stage distillation tank, the front end of the upper surface of the first-stage distillation tank is in through connection with a gas guide pipe, the first-stage condensation mechanism comprises a first-stage condensation tank, a second protection box, a third protection box and a storage box, and the rear end of the upper surface of the first-stage condensation tank is in through connection with the gas guide pipe. According to the device disclosed by the utility model, purification raw materials are primarily purified through the first-stage distillation mechanism and the first-stage condensation mechanism, and then are further purified through the second-stage distillation mechanism and the second-stage condensation mechanism, so that the purity of finished products is improved, and the device can be cleaned and discharged through the feeding pipe, the first discharge pipe, the water injection pipe and the second discharge pipe.

Description

Technical Field

[0001] The utility model relates to the field of distillation devices for purifying high-purity nitric acid, in particular to a distillation device for purifying high-purity nitric acid. Background Art

[0002] The distillation apparatus for purifying high-purity nitric acid is a device that utilizes the different boiling points of the components in a liquid mixture to purify the nitric acid solution by distillation. It is widely used in scientific research and production fields that require high-purity nitric acid, such as semiconductor manufacturing, electronic material cleaning, and trace metal element analysis.

[0003] However, most of the existing distillation devices for purifying high-purity nitric acid on the market that use a single distillation purification method have poor purification effects and low purity of the purified nitric acid, which is difficult to meet the needs of purifying higher-purity nitric acid.

[0004] Therefore, those skilled in the art provide a distillation apparatus for purifying high-purity nitric acid to solve the problems raised in the above background technology. Utility Model Content

[0005] The purpose of the present utility model is to overcome the shortcomings of the prior art and to propose a distillation apparatus for purifying high-purity nitric acid. The raw material to be purified is preliminarily purified by a primary distillation mechanism and a primary condensation mechanism, and then further purified by a secondary distillation mechanism and a secondary condensation mechanism, thereby improving the purity of the finished product. The apparatus can be cleaned and drained through a feed pipe, a first sewage pipe, a water injection pipe, and a second sewage pipe.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] A distillation apparatus for purifying high-purity nitric acid, comprising a primary distillation mechanism, a primary condensation mechanism, a secondary distillation mechanism, and a secondary condensation mechanism. The primary distillation mechanism comprises a primary distillation tank and a first protection box. A first heating plate is provided in the middle of the primary distillation tank. An air guide pipe is connected through the front end of the upper surface of the primary distillation tank.

[0008] The first-level condensing mechanism includes a first-level condensing tank, a second protection box, a third protection box and a storage box, the rear end of the upper surface of the first-level condensing tank is connected with the air guide pipe, the middle part of the lower end of the first-level condensing tank is fixedly connected with a first connecting pipe, the upper end of the second protection box is fixedly connected with the first condensing tank, the middle part of the inner bottom surface of the second protection box is fixedly connected with a first water pump, the outer wall of one side of the first connecting pipe passes through the second protection box and is fixedly connected to the water inlet of the first water pump, the water outlet of the first water pump is fixedly connected with a delivery pipe, the interior of the delivery pipe is provided with a second solenoid valve, the front end outer wall of the first-level condensing tank The middle part of the wall is fixedly connected to the third protection box, the inner wall of the rear end of the third protection box is provided with a second water pump, the water outlet of the second water pump is fixedly connected to the second connecting pipe, the upper end of the second connecting pipe passes through the third protection box to the interior of the first-level condensation tank and is fixedly connected to the spiral condensation pipe, the lower part of the outer wall of the front end of the first-level condensation tank is fixedly connected to the storage box, the water inlet of the second water pump is fixedly connected to the third connecting pipe, the lower end of the third connecting pipe passes through the third protection box to the outside of the third protection box and is connected to the storage box, and the lower end of the spiral condensation pipe passes through the first-level condensation tank and is fixedly connected to the storage box;

[0009] The secondary distillation mechanism includes a secondary distillation tank, the upper end of the delivery pipe passes through the second protection box and is connected to the secondary distillation tank, a second heating plate is provided in the middle of the secondary distillation tank, and a PLC control panel is provided at the lower portion of the outer wall of one side of the secondary distillation tank;

[0010] The secondary condensation mechanism includes a secondary condensation tank, the outer wall of the rear end of the secondary distillation tank is fixedly connected to a reduced diameter condensation pipe, and the lower end of the reduced diameter condensation pipe is connected to the flange of the secondary condensation tank;

[0011] Through the above technical solution, the raw materials for purifying nitric acid are preliminarily distilled through the first heating plate in the primary distillation mechanism, condensed using the spiral condenser in the primary condensation mechanism, and then purified for the second time through the second heating plate in the secondary distillation mechanism and the reduced-diameter condenser in the secondary condensation mechanism, thereby improving the purity of the purified product.

[0012] Furthermore, a feed pipe is connected through the rear end of the upper surface of the first-level distillation tank, a first sewage pipe is fixedly connected to the middle of the lower end of the first-level distillation tank, a water injection pipe is fixedly connected to the middle of the upper end of the first-level condensation tank, and a second sewage pipe is fixedly connected to the middle of the lower end of the second-level distillation tank;

[0013] Through the above technical solution, the distillation device for purifying high-purity nitric acid can be cleaned and drained through the feed pipe and the first drain pipe on the first distillation tank, the water injection pipe on the first condensation tank and the second drain pipe on the second distillation tank.

[0014] Furthermore, a plurality of first supporting legs are fixedly connected to the edge of the lower end of the first-stage distillation tank, a plurality of second supporting legs are fixedly connected to the edge of the lower end of the first-stage condensation tank, and a plurality of third supporting legs are fixedly connected to the edge of the lower end of the second-stage distillation tank;

[0015] Through the above technical solution, the distillation device for purifying high-purity nitric acid can be stably placed on the ground through the first supporting legs, second supporting legs and third supporting legs fixedly connected at the lower ends of the first distillation tank, the first condensation tank and the second distillation tank.

[0016] Furthermore, the middle portion of the upper end of the primary distillation tank is fixedly connected to the first protection box, and a servo motor is provided on the bottom surface of the first protection box;

[0017] Through the above technical solution, the servo motor in the first protective box fixedly connected to the first-level distillation tank drives the stirring blades on the rotating rod, so that the raw materials inside the first-level distillation mechanism can be heated evenly when heating, thereby improving the heating effect.

[0018] Furthermore, the servo motor output shaft is fixedly connected to a rotating rod, the lower end of the rotating rod passes through the first protective box and extends into the interior of the primary distillation tank, and a plurality of stirring blades are fixedly connected to the middle portion of the outer wall of the rotating rod;

[0019] Through the above technical solution, the servo motor drives the rotating rod extending into the first-level distillation tank to rotate, so that the stirring blades fixedly connected to the rotating rod can stir the purified raw materials inside, allowing the raw materials to be evenly heated.

[0020] Furthermore, a first water valve is provided at the lower end of the front outer wall of the storage box, and a second water valve is provided at the lower portion of the front outer wall of the secondary condensation tank;

[0021] Through the above technical solution, the coolant in the spiral condenser tube can be replaced or replenished through the first water valve set at the lower end of the front outer wall of the storage box, and the purified finished product inside the secondary condensation tank can be taken out through the second water valve set at the front end of the secondary condensation tank.

[0022] Furthermore, a first solenoid valve is provided inside the first sewage pipe, and a third solenoid valve is provided inside the second sewage pipe;

[0023] With the above technical solution, the first and second sewage pipes can be opened and closed by the first solenoid valve disposed inside the first sewage pipe and the third solenoid valve disposed inside the second sewage pipe using a PLC control panel.

[0024] Furthermore, the upper end of the outer wall of the feed pipe is threadedly connected to a first sealing cover, and the upper end of the outer wall of the water injection pipe is threadedly connected to a second sealing cover;

[0025] Through the above technical solution, the first sealing cover threadedly connected to the upper end of the outer wall of the feed pipe can prevent the raw materials from leaking out during distillation in the first-stage distillation tank, and the second sealing cover threadedly connected to the upper end of the outer wall of the water injection pipe can prevent the interior of the first-stage condensation tank from contacting the outside world during operation.

[0026] The utility model has the following beneficial effects:

[0027] 1. The utility model proposes a distillation apparatus for purifying high-purity nitric acid, which performs preliminary distillation of the raw materials for purifying nitric acid through the first heating plate in the primary distillation mechanism, condenses the raw materials using the spiral condenser in the primary condensation mechanism, and then performs secondary purification through the second heating plate in the secondary distillation mechanism and the reduced-diameter condenser in the secondary condensation mechanism, thereby improving the purity of the finished product after purification.

[0028] 2. The utility model proposes a distillation apparatus for purifying high-purity nitric acid. The distillation apparatus for purifying high-purity nitric acid can be cleaned and drained through the feed pipe and the first drain pipe on the first distillation tank, the water injection pipe on the first condensation tank, and the second drain pipe on the second distillation tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a main diagram of a distillation device for purifying high-purity nitric acid proposed in the utility model;

[0030] Figure 2 This is a side sectional view of a first-stage distillation tank and a first-stage condensation tank of a distillation device for purifying high-purity nitric acid proposed in the utility model;

[0031] Figure 3 This is a front cross-sectional view of a primary condenser and a secondary distillation tank of a distillation device for purifying high-purity nitric acid proposed in the utility model;

[0032] Figure 4 A side cross-sectional view of a secondary distillation tank and a secondary condensation tank of a distillation device for purifying high-purity nitric acid proposed in the utility model;

[0033] Figure 5 This is a top-sectional view of a secondary distillation tank and a secondary condensation tank of a distillation device for purifying high-purity nitric acid proposed in the utility model.

[0034] Legend:

[0035] Among them, 1. first-stage distillation mechanism; 101. first-stage distillation tank; 102. first heating plate; 103. first supporting leg; 104. feed pipe; 105. first sealing cover; 106. first protective box; 107. servo motor; 108. rotating rod; 109. stirring blade; 110. first sewage pipe; 111. first solenoid valve; 112. air guide pipe;

[0036] 2. Primary condensing mechanism; 201. Primary condensing tank; 202. Water injection pipe; 203. Second sealing cover; 204. First connecting pipe; 205. Second protection box; 206. First water pump; 207. Second support leg; 208. Third protection box; 209. Second water pump; 210. Second connecting pipe; 211. Spiral condenser; 212. Third connecting pipe; 213. Storage box; 214. First water valve; 215. Delivery pipe; 216. Second solenoid valve;

[0037] 3. Secondary distillation mechanism; 301. Secondary distillation tank; 302. Second sewage pipe; 303. Third solenoid valve; 304. Third support leg; 305. Second heating plate; 306. PLC control panel;

[0038] 4. Secondary condensation mechanism; 401. Secondary condensation tank; 402. Reduced diameter condensation tube; 403. Second water valve. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the specific embodiments of the present invention to clearly and completely describe the technical solutions in the specific embodiments of the present invention. Obviously, the specific embodiments described are only part of the specific embodiments of the present invention, not all of the specific embodiments. Based on the specific embodiments of the present invention, all other specific embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0040] Reference Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5 , a specific implementation method provided by the utility model:

[0041] A distillation apparatus for purifying high-purity nitric acid includes a primary distillation mechanism 1, a primary condensation mechanism 2, a secondary distillation mechanism 3, and a secondary condensation mechanism 4. The primary distillation mechanism 1 includes a primary distillation tank 101 and a first protective box 106. A first heating plate 102 is provided in the middle of the primary distillation tank 101. An air guide pipe 112 is connected to the front end of the upper surface of the primary distillation tank 101.

[0042] The first-level condensing mechanism 2 includes a first-level condensing tank 201, a second protection box 205, a third protection box 208 and a storage box 213. The rear end of the upper surface of the first-level condensing tank 201 is connected to the air guide pipe 112. The middle part of the lower end of the first-level condensing tank 201 is fixedly connected with a first connecting pipe 204. The upper end of the second protection box 205 is fixedly connected to the first-level condensing tank 201. The middle part of the inner bottom surface of the second protection box 205 is fixedly connected with a first water pump 206. The outer wall of one side of the first connecting pipe 204 passes through the second protection box 205 and is fixedly connected to the water inlet of the first water pump 206. The water outlet of the first water pump 206 is fixedly connected with a delivery pipe 215. The interior of the delivery pipe 215 is provided with a second solenoid valve 216. The outer wall of the front end of the first condensing tank 201 The middle part is fixedly connected to the third protection box 208, and the inner wall of the rear end of the third protection box 208 is provided with a second water pump 209. The water outlet of the second water pump 209 is fixedly connected to the second connecting pipe 210. The upper end of the second connecting pipe 210 passes through the third protection box 208 to the interior of the first-level condensation tank 201 and is fixedly connected to the spiral condensation pipe 211. The lower part of the outer wall of the front end of the first-level condensation tank 201 is fixedly connected to the storage box 213. The water inlet of the second water pump 209 is fixedly connected to the third connecting pipe 212. The lower end of the third connecting pipe 212 passes through the third protection box 208 to the outside of the third protection box 208 and is connected to the storage box 213. The lower end of the spiral condensation pipe 211 passes through the first-level condensation tank 201 and is fixedly connected to the storage box 213.

[0043] The secondary distillation mechanism 3 includes a secondary distillation tank 301. The upper end of the delivery pipe 215 passes through the second protective box 205 and is connected to the secondary distillation tank 301. A second heating plate 305 is provided in the middle of the secondary distillation tank 301. A PLC control panel 306 is provided at the lower portion of the outer wall of one side of the secondary distillation tank 301.

[0044] The secondary condensation mechanism 4 includes a secondary condensation tank 401 . A reduced diameter condensation pipe 402 is fixedly connected to the outer wall of the rear end of the secondary distillation tank 301 . The lower end of the reduced diameter condensation pipe 402 is flange-connected to the secondary condensation tank 401 .

[0045] A plurality of first support legs 103 are fixedly connected to the edge of the lower end of the first distillation tank 101, and a plurality of second support legs 207 are fixedly connected to the edge of the lower end of the first condensation tank 201. ，A plurality of third support legs 304 are fixedly connected to the edge of the lower end of the secondary distillation tank 301. Through the first support leg 103, the second support leg 207 and the third support leg 304 fixedly connected to the lower end of the primary distillation tank 101, the primary condensation tank 201 and the secondary distillation tank 301, the distillation device for purifying high-purity nitric acid can be stably placed on the ground. The middle part of the upper end of the primary distillation tank 101 is fixedly connected to the first protective box 106. The bottom surface of the first protective box 106 is provided with a servo motor 107. The servo motor 107 in the first protective box 106 fixedly connected to the primary distillation tank 101 drives the stirring blade 109 on the rotating rod 108. When the primary distillation mechanism 1 is heated, the internal raw materials can be heated evenly, thereby improving the heating effect. The output shaft of the servo motor 107 is fixedly connected to the rotating rod 108. The lower end of 8 passes through the first protective box 106 and extends to the interior of the first distillation tank 101. A plurality of stirring blades 109 are fixedly connected to the middle part of the outer wall of the rotating rod 108. The rotating rod 108 extending to the interior of the first distillation tank 101 is driven to rotate by the servo motor 107, so that the stirring blades 109 fixedly connected to the rotating rod 108 can stir the purified raw materials inside to allow the raw materials to be heated evenly. A first water valve 214 is provided at the lower end of the front end outer wall of the storage box 213, and a second water valve 403 is provided at the lower part of the outer wall of the front end of the secondary condensation tank 401. The coolant in the spiral condenser 211 can be replaced or supplemented through the first water valve 214 provided at the lower end of the front end outer wall of the storage box 213, and the purified finished product inside the secondary condensation tank 401 can be taken out through the second water valve 403 provided at the front end of the secondary condensation tank 401.

[0046] Reference Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 The rear end of the upper surface of the first-level distillation tank 101 is connected with a feed pipe 104, the middle of the lower end of the first-level distillation tank 101 is fixedly connected with a first sewage pipe 110, the middle of the upper end of the first-level condensation tank 201 is fixedly connected with a water injection pipe 202, and the middle of the lower end of the second-level distillation tank 301 is fixedly connected with a second sewage pipe 302.

[0047] A first solenoid valve 111 is provided inside the first sewage pipe 110, and a third solenoid valve 303 is provided inside the second sewage pipe 302. The first solenoid valve 111 provided inside the first sewage pipe 110 and the third solenoid valve 303 provided inside the second sewage pipe 302 can be used to realize the opening and closing of the first sewage pipe 110 and the second sewage pipe 302 by means of the PLC control panel 306. The upper end of the outer wall of the feed pipe 104 is threadedly connected to the first sealing cover 105, and the upper end of the outer wall of the water injection pipe 202 is threadedly connected to the second sealing cover 203. The first sealing cover 105 threadedly connected to the upper end of the outer wall of the feed pipe 104 can prevent the raw materials from leaking out during the distillation of the first-stage distillation tank 101, and the second sealing cover 203 threadedly connected to the upper end of the outer wall of the water injection pipe 202 can prevent the internal part of the first-stage condensation tank 201 from contacting the outside world during operation.

[0048] Working Principle: When using the distillation apparatus for purifying high-purity nitric acid, first close the first solenoid valve 111 in the first drain pipe 110, inject raw materials into the primary distillation tank 101 through the feed pipe 104 on the primary distillation tank 101, and use the servo motor 107 in the first protective box 106 to drive the rotating rod 108 to rotate and stir the raw materials, so that the first heating plate 102 can heat the raw materials more evenly. After distillation, the raw materials flow along the air guide pipe 112 into the first condenser 201, and are cooled by the spiral condenser tube 211 and flow into the first connecting pipe 204. At this time, the second solenoid valve 216 in the delivery pipe 215 is opened, and the cooled purified liquid is pumped into the secondary distillation tank 301 by the first water pump 206;

[0049] Next, the second solenoid valve 216 in the delivery pipe 215 and the third solenoid valve 303 in the second sewage pipe 302 are closed. The second heating plate 305 in the secondary distillation tank 301 performs secondary heating on the primary purified nitric acid in the secondary distillation tank 301. The secondary distilled nitric acid rises to the top surface of the secondary distillation tank 301, condenses along the reduced diameter condensing pipe 402, and enters the secondary condensation tank 401. The finished nitric acid inside can be taken out through the second water valve on the secondary condensation tank 401.

[0050] Finally, keep the first solenoid valve 111 in the first drain pipe 110 and the third solenoid valve 303 in the second drain pipe 302 closed, inject cleaning liquid into the primary distillation tank 101 and the primary condensation tank 201 through the feed pipe 104 and the water injection pipe 202, start the servo motor 107 to drive the rotating rod 108 to rotate, and let the stirring blade 109 stir the cleaning liquid in the primary distillation tank 101, open the first solenoid valve 111 in the first drain pipe 110 to discharge the cleaning liquid in the primary distillation tank 101, and pump the cleaning liquid in the primary condensation tank 201 into the secondary distillation tank 301 through the first water pump 206 to clean it, then open the third solenoid valve 303 in the second drain pipe 302 to discharge the cleaning liquid in the secondary distillation tank 301, remove the flange connecting the reduced diameter condenser pipe 402 and the secondary condensation tank 401, and then take out the secondary condensation tank 401 to clean or replace it separately.

[0051] Finally, it should be noted that the above is only a preferred specific implementation method of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned specific implementation methods, those skilled in the art can still modify the technical solutions described in the aforementioned specific implementation methods or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A distillation apparatus for purifying high-purity nitric acid, comprising a primary distillation mechanism (1), a primary condensation mechanism (2), a secondary distillation mechanism (3) and a secondary condensation mechanism (4), characterized in that: The primary distillation mechanism (1) comprises a primary distillation tank (101) and a first protective box (106); a first heating plate (102) is provided in the middle of the primary distillation tank (101); and an air guide pipe (112) is connected through the front end of the upper surface of the primary distillation tank (101); The first-stage condensing mechanism (2) comprises a first-stage condensing tank (201), a second protection box (205), a third protection box (208) and a storage box (213); the rear end of the upper surface of the first-stage condensing tank (201) is connected to the air guide pipe (112); the middle part of the lower end of the first-stage condensing tank (201) is fixedly connected to a first connecting pipe (204); the upper end of the second protection box (205) is fixedly connected to the first-stage condensing tank (201); the middle part of the inner bottom surface of the second protection box (205) is fixedly connected to a first water pump (206); the outer wall of one side of the first connecting pipe (204) passes through the second protection box (205) and is fixedly connected to the water inlet of the first water pump (206); the water outlet of the first water pump (206) is fixedly connected to a delivery pipe (215); a second solenoid valve (216) is provided inside the delivery pipe (215); the front end of the first-stage condensing tank (201) is fixedly connected to a first connecting pipe (204); the upper end of the second protection box (205) is fixedly connected to the first-stage condensing tank (201); the upper end of the second protection box (205) is fixedly connected to the first water pump (206); the upper end of the second protection box (205) is fixedly connected to the first water pump (206); the upper end of the first ... The middle part of the outer wall is fixedly connected to the third protection box (208); the inner wall of the rear end of the third protection box (208) is provided with a second water pump (209); the water outlet of the second water pump (209) is fixedly connected to a second connecting pipe (210); the upper end of the second connecting pipe (210) passes through the third protection box (208) to the interior of the first-stage condensation tank (201) and is fixedly connected to a spiral condensation pipe (211); the lower part of the front end outer wall of the first-stage condensation tank (201) is fixedly connected to the storage box (213); the water inlet of the second water pump (209) is fixedly connected to a third connecting pipe (212); the lower end of the third connecting pipe (212) passes through the third protection box (208) to the outside of the third protection box (208) and is connected to the storage box (213); the lower end of the spiral condensation pipe (211) passes through the first-stage condensation tank (201) and is fixedly connected to the storage box (213); The secondary distillation mechanism (3) includes a secondary distillation tank (301), the upper end of the delivery pipe (215) passes through the second protection box (205) and is connected to the secondary distillation tank (301), a second heating plate (305) is provided in the middle of the secondary distillation tank (301), and a PLC control panel (306) is provided at the lower part of the outer wall of one side of the secondary distillation tank (301); The secondary condensation mechanism (4) includes a secondary condensation tank (401), and a reduced diameter condensation pipe (402) is fixedly connected to the outer wall of the rear end of the secondary distillation tank (301), and the lower end of the reduced diameter condensation pipe (402) is flange-connected to the secondary condensation tank (401).

2. A distillation apparatus for purifying high-purity nitric acid according to claim 1, characterized in that: The rear end of the upper surface of the first-stage distillation tank (101) is connected to a feed pipe (104), the middle of the lower end of the first-stage distillation tank (101) is fixedly connected to a first sewage pipe (110), the middle of the upper end of the first-stage condensation tank (201) is fixedly connected to a water injection pipe (202), and the middle of the lower end of the second-stage distillation tank (301) is fixedly connected to a second sewage pipe (302).

3. A distillation apparatus for purifying high-purity nitric acid according to claim 1, characterized in that: A plurality of first support legs (103) are fixedly connected to the edge of the lower end of the first-stage distillation tank (101). ， A plurality of second supporting legs (207) are fixedly connected to the edge of the lower end of the first-stage condensation tank (201). ， A plurality of third supporting legs (304) are fixedly connected to the edge of the lower end of the secondary distillation tank (301).

4. A distillation apparatus for purifying high-purity nitric acid according to claim 1, characterized in that: The middle portion of the upper end of the primary distillation tank (101) is fixedly connected to the first protection box (106), and a servo motor (107) is provided on the bottom surface of the first protection box (106).

5. A distillation apparatus for purifying high-purity nitric acid according to claim 4, characterized in that: The output shaft of the servo motor (107) is fixedly connected to a rotating rod (108), the lower end of the rotating rod (108) passes through the first protective box (106) and extends to the interior of the primary distillation tank (101), and the middle part of the outer wall of the rotating rod (108) is fixedly connected to a plurality of stirring blades (109).

6. A distillation apparatus for purifying high-purity nitric acid according to claim 1, characterized in that: A first water valve (214) is provided at the lower end of the front outer wall of the storage box (213), and a second water valve (403) is provided at the lower portion of the front outer wall of the secondary condensation tank (401).

7. A distillation apparatus for purifying high-purity nitric acid according to claim 2, characterized in that: A first solenoid valve (111) is provided inside the first sewage pipe (110). ， A third solenoid valve (303) is provided inside the second sewage discharge pipe (302).

8. A distillation apparatus for purifying high-purity nitric acid according to claim 2, characterized in that: The upper end of the outer wall of the feed pipe (104) is threadedly connected to a first sealing cover (105), and the upper end of the outer wall of the water injection pipe (202) is threadedly connected to a second sealing cover (203).

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