Purification equipment for producing electronic-grade industrial nitric acid

Abstract

The invention relates to the technical field of nitric acid purification, in particular to purification equipment for producing electronic-grade industrial nitric acid, which comprises a heated barrel, a heating component, a feeding component, a condensing component, a collecting barrel and a gas transmission component, the heating component is connected to the outer wall of the heated barrel, and the condensing component is connected to the bottom of the heated barrel; and the collecting barrel is communicated with the condensing assembly. The heated barrel is divided into the heating area and the feeding area through the arc-shaped pipe, so that acid steam on the inner wall of the arc-shaped pipe exchanges heat with reagent-grade nitric acid in the feeding area, heat released during condensation is absorbed by the reagent-grade nitric acid in the feeding area, and the energy utilization rate is increased; the circulation path in the feeding area and the heating area is only the top of the arc-shaped pipe, so that direct convection between the solution in the heating area and the solution in the feeding area is reduced, loss of heat of the solution in the heating area is reduced, heat is concentrated in the heating area due to the heat insulation effect of the arc-shaped pipe, the heating effect is further improved, and the evaporation speed is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of nitric acid purification, and specifically to a purification device for producing electronic-grade industrial nitric acid. Background Art

[0002] Nitric acid is one of the six major inorganic strong acids, with strong oxidizing and corrosive properties. It is an important chemical raw material. The pure product is a colorless, transparent, fuming liquid with a sour taste. Industrially, it can be used to produce chemical fertilizers, pesticides, explosives, dyes, etc. Among them, electronic-grade nitric acid is a classification of high-purity reagents, with a purity of up to 99.9%. It is mainly a chemical reagent for cleaning electronic components.

[0003] The existing production of electronic-grade nitric acid is mainly obtained by shunting reagent-grade nitric acid. The shunting technology mainly utilizes the different boiling points of liquid mixtures to separate step by step. The existing technology generally uses an acid purifier for purification, and the acid purifier mainly uses the sub-boiling distillation method. Using the principle of thermal radiation, the liquid temperature is kept below the boiling point for evaporation, and then the acid vapor is condensed to prepare high-purity water and high-purity reagents. This device consists of a heating barrel, a condensation cover, and a collection device. The liquid is heated by the heating barrel, and the nitric acid in the solution absorbs heat and evaporates into a gas. When the gas encounters the condensation shell, it releases heat and condenses into droplets and flows into the collection device. Since the condensation shell in the existing technology is located above the heating barrel, the heat generated by condensation is directly released to the outside, resulting in the waste of the heat released by condensation and causing energy waste.

[0004] Therefore, a purification device for producing electronic-grade industrial nitric acid is proposed. Summary of the Invention

[0005] The purpose of the present invention is to provide a purification device for producing electronic-grade industrial nitric acid to solve the problem of energy waste caused by the inability to utilize the heat released during the condensation of acid vapor. By returning the acid vapor to the bottom of the heated liquid and contacting it with the newly introduced reagent-grade nitric acid, the heat released during condensation is released into the heating barrel to preheat the incoming reagent-grade nitric acid, thereby solving the problem of energy waste caused by the inability to utilize the heat released during the condensation of acid vapor.

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

[0007] A purification device for producing electronic-grade industrial nitric acid, including a heating barrel, further including a heating component, a feeding component, a condensing component, a collecting barrel and a gas transmission component. The heating component is connected to the outer wall of the heating barrel, the condensing component is connected to the bottom of the heating barrel, the collecting barrel is communicated with the condensing component and is located at the bottom of the heating barrel. The feeding component is connected to the bottom of the condensing component and is communicated with the bottom of the heating barrel. The gas transmission component is connected to the top of the heating barrel and passes through the inside of the heating barrel from top to bottom to be communicated with the condensing component. The nitric acid inside the heating barrel is heated by the heating component to generate steam and flows into the gas transmission component, and then the steam is transported to the condensing component through the gas transmission component.

[0008] In the above solution, the acid steam is refluxed into the heating barrel through the gas transmission component, so that the acid steam contacts the reagent-grade nitric acid at the bottom of the heating barrel. Since in the prior art and this solution, the feeding method is to enter from the bottom of the heating barrel, and since the liquid with a higher temperature has a smaller density relative to the liquid with a lower temperature, the liquid with a higher temperature will flow above the liquid with a lower temperature. Therefore, the temperature of the reagent-grade nitric acid at the bottom of the heating barrel is relatively low. Therefore, when the acid steam flows back to the bottom of the heating barrel through the outlet pipe, it will exchange heat with the reagent-grade nitric acid at the bottom, so that the heat released by the acid steam is absorbed by the reagent-grade nitric acid at the bottom, realizing the preheating of the reagent-grade nitric acid at the bottom, and thus improving the heating efficiency.

[0009] Preferably, the gas transmission component includes a rotary pipe, and the rotary pipe extends into the heating component.

[0010] In the above solution, when the acid steam is evaporated, it will enter the heating component following the rotary pipe and heat the acid steam, so that the acid steam maintains a relatively high temperature when contacting the low-temperature solution in the feeding area, and thus the acid solution is easier to condense.

[0011] Preferably, the gas transmission component further includes an arc-shaped pipe. A plurality of the arc-shaped pipes are spliced into a cylinder, and the inside of the heating barrel is divided into a feeding area a and a heating area b. The height of the arc-shaped pipe is less than the height of the heating barrel, and the bottom of the arc-shaped pipe is connected to the heating barrel. The feeding area a and the heating area b are communicated at the upper end inside the heating barrel.

[0012] In the above solution, the inside of the heating barrel is divided into two parts by the arc-shaped pipe. The area on the outer wall side of the cylinder formed by the arc-shaped pipe is the heating area, and the area on the inner wall side is the feeding area. Since the middle area of the heating barrel is relatively far from the heating component, the heating rate is relatively slow. The arc-shaped pipe is used to enclose the middle part of the heating barrel, so that the acid steam entering the inner wall of the arc-shaped pipe exchanges heat with the reagent-grade nitric acid with a low temperature in the middle of the heating barrel, so that the temperature of the acid steam drops and condenses. At the same time, the heat released by the acid steam is absorbed by the reagent-grade nitric acid inside the feeding area to preheat the solution in the feeding area, and at the same time, the convection between the solution in the heating area and the solution in the feeding area is reduced, thus accelerating the heating rate of the solution in the heating area.

[0013] Preferably, the thickness of the arc-shaped tube on the side closer to the heating zone b is greater than that on the other side, and the side closer to the heating zone b is made of ceramic material.

[0014] In the above solution, the inner wall thickness of the arc-shaped tube close to the heating zone is thickened, so as to increase the heat insulation effect, make the heat of the heating component concentrated in the heating area, thereby improving the heating speed of the heating area. And the material is ceramic material, because ceramic has low thermal conductivity, which further improves the heat insulation effect. The inner wall thickness of the arc-shaped tube on the side close to the feeding area is reduced, reducing the heat insulation effect, thereby improving the heat exchange effect between the acid vapor and the solution in the feeding area, and further improving the utilization rate of heat.

[0015] Preferably, the heating component includes a housing, a heater and a heating liquid. The housing is connected to the outer wall of the heated barrel, the heater is connected to the bottom inside the housing, and the heating liquid is filled inside the housing.

[0016] In the above solution, the liquid inside the housing is heated by the heater, and then the heated barrel is heated by the liquid. The fluidity of the liquid makes the temperature inside the housing the same, so that the heated barrel is heated more evenly. In the prior art, generally, the heated barrel is heated by a heating plate attached to the inner wall of the heated barrel. To make the heated barrel heated evenly by the heating plate, it is necessary to wrap the entire outer wall of the heated barrel with the heating plate, which consumes a relatively large amount of electric energy. However, when heating the heated barrel with a solution, only a part of the heating plate, that is, the heater in this solution, needs to heat the water. When the temperature inside the heated barrel rises to the specified temperature, the heated barrel still needs to be continuously heated. In the same time, the electric energy consumed by the way of wrapping with the heating plate is greater than that consumed by the way of heating with the heating liquid, thus reducing the energy consumption. Although the heating-up time is increased, the purification process time of nitric acid is relatively long, and the increase in the heating-up time has a relatively small impact on the entire purification process. In the prior art, the heating area is generally the bottom and the outer wall of the heated barrel, making the heating heat concentrated in the area close to the bottom. In this solution, the housing wraps the top and the outer wall of the heated barrel, and the heating area is the top and the outer wall, so that the heating heat is concentrated in the upper part. Because the solution has the characteristic of flowing from the higher temperature to the lower temperature above, the temperature of the solution above the heated barrel is relatively high. And in this solution, the heating heat is concentrated above the heated barrel, thus increasing the evaporation rate of nitric acid in the solution above the heated barrel. Because the heat is concentrated above the heated barrel, the temperature of the solution below the heated barrel is relatively low, thus increasing the temperature difference between the acid vapor in the arc-shaped tube and the solution at the bottom of the feeding area, and further improving the heat exchange effect between the acid vapor and the solution in the feeding area.

[0017] Furthermore, the condensation assembly includes a condensation shell, a collection tank, a liquid outlet pipe, and a connecting pipe. The connecting pipe is connected to the bottom of the heat-receiving barrel and communicates with the arc-shaped pipe. The condensation shell communicates with the bottom end of the connecting pipe and has a semi-circular cross-section. The collection tank is opened at the bottom of the inner wall of the condensation shell. The liquid outlet pipe is connected to the bottom of the condensation shell and communicates with the collection tank and the collection barrel.

[0018] In the above solution, the acid vapor and the nitric acid formed by condensation in the arc-shaped pipe enter the condensation shell through the connecting pipe. Then, the nitric acid formed by condensation flows into the collection barrel through the liquid outlet pipe at the bottom of the collection tank. The acid vapor contacts the top of the condensation shell in the condensation shell and exchanges heat with the outside to condense into a nitric acid solution. After condensation, it flows along the inner wall of the condensation shell to the collection tank and flows into the collection barrel through the liquid inlet pipe. Since the overall flow direction of the acid vapor is upward, by designing the position of the liquid outlet pipe at the bottom of the collection tank, the acid vapor flowing into the collection barrel is reduced.

[0019] Preferably, the feeding assembly includes a liquid storage tank, a water pump, and a liquid inlet pipe. The liquid storage tank is connected to the bottom of the condensation shell. The top of the liquid storage tank is semi-circular and fits with the bottom of the condensation shell. A water pump is connected to the top of the liquid storage tank. The top of the water pump is connected to a liquid inlet pipe. The liquid inlet pipe passes through the condensation shell and is connected to the bottom of the heat-receiving barrel.

[0020] In the above solution, by using the top of the liquid storage tank to fit with the bottom of the condensation shell and the liquid inlet pipe passing through the condensation shell, the acid vapor flowing inside the condensation shell exchanges heat with the solution inside the liquid storage tank and the liquid inlet pipe, thereby improving the condensation effect of the acid vapor in the condensation shell. At the same time, the solution entering the heat-receiving barrel is preheated, thereby improving the utilization effect of the heat released during the condensation of the acid vapor.

[0021] Preferably, the two collection barrels communicate with the liquid outlet pipe, and the cross-section of the collection barrel is arc-shaped and fits with the outer wall of the liquid storage tank.

[0022] In the above solution, the collection barrel is cooled by the liquid storage tank. Since nitric acid itself is volatile, and the temperature of the nitric acid solution obtained after condensation is still higher than normal temperature, it is easier to volatilize. Therefore, the collection barrel is fitted with the liquid storage tank to cool the nitric acid in the collection barrel, thereby reducing the volatilization of nitric acid. And nitric acid is easily decomposed when heated, and the higher the purity, the easier it is to decompose. By accelerating the temperature drop of the nitric acid in the collection barrel by the liquid storage tank, the decomposition effect of nitric acid is reduced.

[0023] Preferably, a drain pipe is connected to the bottom of the heat-receiving barrel, and the drain pipe communicates with the heating area.

[0024] In the above solution, the existing method for discharging waste is to connect a control valve to the discharge port to control the opening and closing of the discharge port. Since the main distillation process occurs in the heating zone, the waste liquid after distillation is mainly concentrated in the heating zone. Therefore, the drain pipe is connected to the bottom of the heating zone, and when discharging waste after evaporation, it will not affect the solution in the feeding zone.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0026] 1. By providing an arc-shaped pipe, the arc-shaped pipe divides the interior of the heat-receiving barrel into a heating zone and a feeding zone, and enables the acid vapor entering the inner wall of the arc-shaped pipe to exchange heat with the reagent-grade nitric acid in the feeding zone, causing the acid vapor to condense. At the same time, the heat released during condensation is absorbed by the reagent-grade nitric acid inside the feeding zone to preheat the solution in the feeding zone, thereby improving the energy utilization rate. On the other hand, since the height of the arc-shaped pipe is less than the height of the heat-receiving barrel, the circulation path between the feeding zone and the heating zone is only at the top of the arc-shaped pipe, thus reducing the direct convection between the solution in the heating zone and the solution in the feeding zone, reducing the heat loss of the solution in the heating zone, thereby accelerating the heating rate of the solution in the heating zone. Moreover, the arc-shaped pipe has a heat insulation effect inside, concentrating the heat in the heating zone, further improving the heating effect and increasing the evaporation rate.

[0027] 2. By providing a heating component, the flow of the heating liquid makes the temperature inside the outer shell the same, so that the heat-receiving barrel is heated more evenly. At the same time, by wrapping the top and outer wall of the heat-receiving barrel with the outer shell, the heating heat is concentrated in the upper part, accelerating the evaporation rate of nitric acid in the solution above the heat-receiving barrel, and making the temperature of the solution below the heat-receiving barrel relatively low, increasing the temperature difference between the acid vapor in the arc-shaped pipe and the solution at the bottom of the feeding zone, and further improving the heat exchange effect between the acid vapor and the solution in the feeding zone.

[0028] 3. By providing a collection barrel and a liquid storage tank, the liquid storage tank cools the nitric acid in the collection barrel, thereby reducing the volatilization and decomposition of nitric acid. Moreover, the collection barrel is located below the condensation shell, reducing the inflow of nitric acid in the form of vapor into the collection barrel and improving the collection rate of acid vapor. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0030] Figure 2 is a schematic sectional view of the present invention;

[0031] Figure 3 is a schematic diagram of the structure of the heat-receiving barrel of the present invention;

[0032] Figure 4 is a schematic diagram of the structure of the condensation shell of the present invention;

[0033] Figure 5Schematic diagram of the collection barrel structure of the present invention;

[0034] Figure 6 of the present invention Figure 4 Schematic diagram of the enlarged view structure of part C in;

[0035] Figure 7 Schematic diagram of the flow of reagent-grade nitric acid of the present invention;

[0036] Figure 8 Schematic diagram of the flow of acid vapor of the present invention.

[0037] In the figure: a, feeding area; b, heating area; 1, heat-receiving barrel; 2, heating assembly; 201, outer shell; 202, heater; 203, heating liquid; 3, feeding assembly; 301, liquid storage tank; 302, water pump; 303, liquid inlet pipe; 4, condensation assembly; 401, condensation shell; 402, collection tank; 403, liquid outlet pipe; 404, connecting pipe; 5, collection barrel; 6, gas transmission assembly; 601, rotary pipe; 602, arc pipe; 7, liquid discharge pipe. Specific embodiments

[0038] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention, and in conjunction with the working state, its structural characteristics will be made more detailed. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0039] Please refer to Figures 1 to 8 , the present invention provides a purification device for producing electronic-grade industrial nitric acid, and the technical solution is as follows:

[0040] A purification device for producing electronic-grade industrial nitric acid, referring to Figure 1 , Figure 2 , Figure 7 and Figure 8, including a heating barrel 1, further comprising a heating component 2, a feeding component 3, a condensing component 4, a collecting barrel 5 and a gas transmission component 6. The heating component 2 is connected to the outer wall of the heating barrel 1, and the condensing component 4 is connected to the bottom of the heating barrel 1 and communicates with the bottom of the heating barrel 1, so that the feeding method is to enter from the bottom of the heating barrel 1. Since the liquid with a higher temperature has a smaller density than the liquid with a lower temperature, it will flow above the liquid with a lower temperature. Therefore, the temperature of the reagent-grade nitric acid at the bottom of the heating barrel 1 is lower than that at the top. The collecting barrel 5 communicates with the condensing component 4 and is located at the bottom of the heating barrel 1. The feeding component 3 is connected to the bottom of the condensing component 4 and communicates with the bottom of the heating barrel 1. The gas transmission component 6 is connected to the top of the heating barrel 1. The gas transmission component 6 passes through the inside of the heating barrel 1 from top to bottom and communicates with the condensing component 4. The nitric acid inside the heating barrel 1 is heated by the heating component 3 to generate steam, which flows into the gas transmission component 6, and then the steam is transported to the condensing component 4 through the gas transmission component 6. Therefore, the temperature of the acid steam will be higher than the temperature of the solution at the bottom. The nitric acid steam inside the gas transmission component 6 is used to preheat the just-entered reagent-grade nitric acid and condense the steam, so that the heat released by the acid steam is absorbed by the reagent-grade nitric acid at the bottom, realizing the preheating of the reagent-grade nitric acid at the bottom and thus improving the heating efficiency.

[0041] As an embodiment of the present invention, referring to Figure 3 , the gas transmission component 6 includes a rotary tube 601. The rotary tube 601 extends into the heating component 2 to heat the acid steam, so that the acid steam maintains a relatively high temperature when contacting the low-temperature solution in the feeding area a, making it easier for the acid solution to condense.

[0042] As an embodiment of the present invention, referring to Figure 3, the gas transmission component 6 further includes an arc-shaped pipe 602, which increases the heat exchange area between the acid vapor and the solution and improves the heat exchange effect. A plurality of the arc-shaped pipes 602 are spliced into a cylindrical shape, and the interior of the heating barrel 1 is divided into a feeding area a and a heating area b. The outer wall area of the cylinder formed by the arc-shaped pipe 602 is the heating area b, and the inner wall area is the feeding area a. Since the middle area of the heating barrel 1 is relatively far from the heating component 2, the heating rate is relatively slow. Therefore, the temperature of the solution in the feeding area a is lower than that of the solution in the heating area b. When the acid vapor enters the arc-shaped pipe 602, it exchanges heat with the reagent-grade nitric acid in the feeding area a to condense the acid vapor. At the same time, the heat released when the acid vapor condenses is absorbed by the solution inside the feeding area a to preheat the solution in the feeding area a. The height of the arc-shaped pipe 602 is less than the height of the heating barrel 1, and the bottom of the arc-shaped pipe 602 is connected to the heating barrel 1. The feeding area a and the heating area b are connected at the upper end inside the heating barrel 1. Therefore, the solution in the feeding area a can only flow into the heating area b from the top of the arc-shaped pipe 602, thereby reducing the direct convection between the solution in the heating area b and the solution in the feeding area a, further reducing the heat loss of the solution in the heating area b, and accelerating the heating rate. Because the high-temperature solution is in the upper layer and the low-temperature solution is in the lower layer, the low-temperature solution is left in the feeding area a, and thus the acid vapor is always in contact with the low-temperature solution, improving the heat exchange effect.

[0043] As an embodiment of the present invention, referring to Figure 3 , the thickness of the arc-shaped pipe 602 on the side close to the heating area b is greater than that on the other side, thereby increasing the heat insulation effect, concentrating the heat of the heating component 2 in the heating area b, and thus increasing the heating rate of the heating area b. Relatively, the inner wall thickness of the arc-shaped pipe 602 on the side close to the feeding area a is relatively small, thereby reducing the heat insulation effect, further improving the heat exchange effect between the acid vapor and the solution in the feeding area a, and improving the utilization rate of heat. And the side close to the heating area b is made of ceramic material because ceramic has a low thermal conductivity, further improving the heat insulation effect.

[0044] As an embodiment of the present invention, referring to Figure 3, the heating component 2 includes a housing 201, a heater 202, and a heating liquid 203. The housing 201 is connected to the outer wall of the heated barrel 1. The heater 202 heats the liquid inside the housing 201, and then heats the heated barrel 1 through the liquid. By using the fluidity of the liquid, the temperature inside the housing 201 is the same, so that the heated barrel 1 is heated more evenly. The heater 202 is connected to the bottom inside the housing 201. The heating liquid 203 is filled inside the housing 201. Because the solution has the characteristic of flowing from the higher temperature to the lower temperature above, the temperature of the solution above the heated barrel 1 is relatively high. By wrapping the top and outer wall of the heated barrel 1 with the housing 201, the heating area b is the top and the outer wall, so that the heating heat is concentrated on the upper part. Furthermore, the nitric acid in the solution above the heated barrel 1 is more likely to evaporate, accelerating the evaporation speed. Because the heat is concentrated above the heated barrel 1, the temperature of the solution below the heated barrel 1 is relatively low, increasing the temperature difference between the acid vapor in the arc-shaped tube 602 and the solution at the bottom of the feeding area a, and further improving the heat exchange effect between the acid vapor and the solution in the feeding area a.

[0045] As an implementation manner of the present invention, referring to Figure 3 and Figure 4 , the condensing component 4 includes a condensing shell 401, a collecting tank 402, a liquid outlet pipe 403, and a connecting pipe 404. The connecting pipe 404 is connected to the bottom of the heated barrel 1 and is communicated with the arc-shaped tube 602. The condensing shell 401 is connected to the bottom end of the connecting pipe 404. The acid vapor and the formed nitric acid in the arc-shaped tube 602 enter the condensing shell 401 through the connecting pipe 404, and the cross-section is set as a semi-circle. The collecting tank 402 is opened at the bottom of the inner wall of the condensing shell 401. The acid vapor contacts the top of the condensing shell 401 in the condensing shell 401 and exchanges heat with the outside to condense into a nitric acid solution, and then flows along the inner wall of the condensing shell 401 to the collecting tank 402. The liquid outlet pipe 403 is connected to the bottom of the condensing shell 401 and is communicated with the collecting tank 402 and the collecting barrel 5. The condensed nitric acid flows into the collecting barrel 5 through the liquid outlet pipe 403 at the bottom of the collecting tank 402, and it also avoids the acid vapor from flowing into the collecting barrel 5.

[0046] As an implementation manner of the present invention, referring to Figure 4 , Figure 5, the feeding assembly 3 includes a liquid storage tank 301, a water pump 302 and a liquid inlet pipe 303. The liquid storage tank 301 is connected to the bottom of the condensation shell 401. The top of the liquid storage tank 301 is semi-circular and fits the bottom of the condensation shell 401, so that the acid vapor flowing inside the condensation shell 401 exchanges heat with the solution in the liquid storage tank 301, thereby improving the condensation effect of the acid vapor in the condensation shell 401. The top of the liquid storage tank 301 is connected to a water pump 302, and the top of the water pump 302 is connected to a liquid inlet pipe 303. The solution in the liquid storage tank 301 is transported from the liquid inlet pipe 303 to the feeding area a of the heating barrel 1 through the water pump 302. The liquid inlet pipe 303 passes through the condensation shell 401 and is connected to the bottom of the heating barrel 1, so that the acid vapor flowing inside the condensation shell 401 exchanges heat with the solution inside the liquid inlet pipe 303, further improving the condensation effect of the acid vapor in the condensation shell 401, and at the same time preheating the solution entering the heating barrel 1, thereby improving the utilization effect of the heat released during the condensation of the acid vapor.

[0047] As an implementation manner of the present invention, referring to Figure 5 and Figure 6 , the two collection barrels 5 are communicated with the liquid outlet pipe 403, and the cross-section of the collection barrel 5 is set to be arc-shaped and fits the outer wall of the liquid storage tank 301. Since the nitric acid in the collection barrel 5 is formed by condensation and the temperature is still relatively high, while the temperature of the liquid storage tank 301 is relatively low, when the liquid storage tank 301 contacts the collection barrel 5, it will cool the collection barrel 5, and then cool the nitric acid in the collection barrel 5, reducing the volatilization and decomposition effect of the nitric acid.

[0048] As an implementation manner of the present invention, referring to Figure 3 , the bottom of the heating barrel 1 is connected to a drain pipe 7, and the drain pipe 7 is communicated with the heating area b. Since the main distillation process is in the heating area b, the distilled waste liquid is also mainly concentrated in the heating area b. Therefore, the drain pipe 7 is connected to the bottom of the heating area b. When discharging the waste after evaporation, it will not affect the solution in the feeding area a.

[0049] Working principle: When in use, start the water pump 302 to transport the reagent-grade nitric acid in the liquid storage tank 301 into the heating barrel 1, and then start the heater 202 to heat the heating liquid 203 in the outer shell 201 through the heater 202, thereby heating the heating barrel 1 by using the heating liquid 203. When the reagent-grade nitric acid in the heating barrel 1 evaporates, the formed acid vapor enters the inside of the condensation shell 401 through the gas transmission assembly 6, and then the condensed nitric acid enters the inside of the collection barrel 5 through the liquid outlet pipe 403.

[0050] To avoid wasting the heat released when the acid vapor condenses, by arranging the gas transmission component 6 to pass through the inside of the heating barrel 1 from top to bottom, when the acid vapor flows in the gas transmission component 6, the acid vapor will exchange heat with the reagent-grade nitric acid at a low temperature at the bottom of the heating barrel 1, so that the heat released when the acid vapor condenses is absorbed by the reagent-grade nitric acid in the feeding area a, thereby reducing heat waste;

[0051] Specifically: The heating barrel 1 is connected to the arc-shaped tube 602 through the rotary tube 601, and the arc-shaped tube 602 is arranged inside the heating barrel 1. Using the cylindrical shape formed by the arc-shaped tube 602, the space inside the heating barrel 1 is divided into two parts. The outer wall of the cylinder is the heating area b, and the inner wall of the cylinder is the feeding area a. Since the temperature of the solution in the feeding area a is lower than that of the solution in the heating area b, when the acid vapor evaporated in the heating area b enters the inside of the arc-shaped tube 602 through the rotary tube 601, the acid vapor exchanges heat with the low-temperature solution in the feeding area a, so that the acid vapor condenses. At the same time, the heat released when the acid vapor condenses is used to preheat the low-temperature solution in the feeding area a, thereby reducing heat waste and shortening the heating time of the solution.

[0052] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A purification device for producing electronic grade industrial nitric acid, comprising a heated barrel (1), characterized in that: The heating assembly (2) further comprises a heating assembly (2), a feeding assembly (3), a condensing assembly (4), a collecting barrel (5) and a gas transmission assembly (6), wherein the heating assembly (2) is connected to the outer wall of the heated barrel (1), the condensing assembly (4) is connected to the bottom of the heated barrel (1), the collecting barrel (5) is communicated with the condensing assembly (4) and is located at the bottom of the heated barrel (1), the feeding assembly (3) is connected to the bottom of the condensing assembly (4) and is communicated with the bottom of the heated barrel (1), the gas transmission assembly (6) is connected to the top of the heated barrel (1), the gas transmission assembly (6) passes through the interior of the heated barrel (1) from top to bottom and is communicated with the condensing assembly (4), the nitric acid inside the heated barrel (1) is heated by the heating assembly (3) to generate steam which flows into the gas transmission assembly (6), and the steam is then transported to the condensing assembly (4) through the gas transmission assembly (6).

2. A purification device for producing electronic grade industrial nitric acid according to claim 1, characterized in that: The heating component (2) comprises an outer shell (201), a heater (202) and a heating liquid (203); the outer shell (201) is connected to the outer wall of the heated barrel (1); the heater (202) is connected to the bottom of the outer shell (201); and the heating liquid (203) is filled in the inner part of the outer shell (201).

3. A purification device for producing electronic grade industrial nitric acid according to claim 1, characterized in that: The gas delivery component (6) comprises a rotary pipe (601), and the rotary pipe (601) extends into the interior of the heating component (2).

4. A purification device for producing electronic grade industrial nitric acid according to claim 3, characterized in that: The gas delivery assembly (6) further comprises an arc-shaped tube (602), wherein a plurality of the arc-shaped tubes (602) are spliced ​​into a cylindrical shape and divide the interior of the heated barrel (1) into a feed zone (a) and a heating zone (b); the height of the arc-shaped tube (602) is less than the height of the heated barrel (1), and the bottom of the arc-shaped tube (602) is connected to the heated barrel (1); the feed zone (a) and the heating zone (b) are connected at the upper end inside the heated barrel (1).

5. A purification device for producing electronic grade industrial nitric acid according to claim 4, characterized in that: The thickness of the arc tube (602) on one side close to the heating zone (b) is greater than the thickness of the other side, and the side close to the heating zone (b) is made of ceramic material.

6. A purification device for producing electronic grade industrial nitric acid according to claim 4, characterized in that: The condensation assembly (4) comprises a condensation shell (401), a collecting tank (402), a liquid outlet pipe (403) and a connecting pipe (404); the connecting pipe (404) is connected to the bottom of the heated barrel (1) and communicates with the arc tube (602); the condensation shell (401) is communicated with the bottom end of the connecting pipe (404), and the cross section is set to be semicircular; the collecting tank (402) is opened at the bottom of the inner wall of the condensation shell (401); the liquid outlet pipe (403) is connected to the bottom of the condensation shell (401) and communicates with the collecting tank (402) and the collecting barrel (5).

7. A purification device for producing electronic grade industrial nitric acid according to claim 6, characterized in that: The feeding assembly (3) comprises a liquid storage tank (301), a water pump (302) and a liquid inlet pipe (303); the liquid storage tank (301) is connected to the bottom of the condensing shell (401); the top of the liquid storage tank (301) is semicircular and fits the bottom of the condensing shell (401); the top of the liquid storage tank (301) is connected to the water pump (302); the top of the water pump (302) is connected to the liquid inlet pipe (303); the liquid inlet pipe (303) passes through the condensing shell (401) and is connected to the bottom of the heated barrel (1).

8. A purification device for producing electronic grade industrial nitric acid according to claim 7, characterized in that: The cross section of the collecting barrel (5) is designed to be arc-shaped and fits closely to the outer wall of the liquid storage tank (301).

9. A purification device for producing electronic grade industrial nitric acid according to claim 4, characterized in that: The bottom of the heated barrel (1) is connected to a drain pipe (7), and the drain pipe (7) is in communication with the heating zone (b).

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