Nitric acid purification device

Abstract

The utility model discloses a nitric acid purification device, which belongs to the technical field of purification, and comprises a raw material storage tank, a multi-stage oxidation device and a high-efficiency rectifying tower, the multi-stage oxidation device is respectively connected with the raw material storage tank and the high-efficiency rectifying tower through a feed pipe and a discharge pipe, the interior of the multi-stage oxidation device is divided into a primary oxidation unit and a deep oxidation unit, efficient filler is arranged in the efficient rectifying tower, an air outlet pipe is installed at the top end of one side of the efficient rectifying tower, a condenser is installed in the air outlet pipe, and a finished product box is installed at one end of the air outlet pipe; the nitric acid purification device can efficiently remove impurities, accurately control the temperature, is simple and convenient to operate, stable and durable, and remarkably improves the purity and the production efficiency of nitric acid.

Description

Technical Field

[0001] This utility model relates to the field of nitric acid purification technology, and more specifically, to a nitric acid purification device. Background Technology

[0002] In numerous fields such as chemical production and scientific research, the requirements for nitric acid purity are constantly increasing. However, existing nitric acid purification technologies and equipment have a series of problems. On the one hand, traditional purification equipment often relies on a single process, making it difficult to completely remove various impurities from nitric acid. This results in the purified nitric acid failing to meet the needs of high-end applications, such as electronic chip manufacturing and advanced chemical analysis, where extremely high purity requirements exist. Nitric acid produced by ordinary purification equipment is unsuitable for these fields. On the other hand, traditional equipment consumes a lot of energy, and the overall heating method leads to significant energy waste. In the current climate of rising energy costs, this undoubtedly increases the cost pressure on production enterprises. Moreover, traditional equipment has a complex structural design, cumbersome operation procedures, and high maintenance difficulty. It not only requires professional technicians for operation and maintenance but also increases the risk of equipment failure. Once a failure occurs, repair costs are high and production schedules are affected. In addition, nitric acid is highly corrosive, and ordinary equipment has poor corrosion resistance, making it easily corroded and damaged. This not only shortens the service life of the equipment but may also lead to nitric acid leakage, causing environmental pollution and safety hazards. Utility Model Content

[0003] To overcome the above shortcomings, this utility model provides a nitric acid purification device, which aims to improve the following problems: on the one hand, traditional purification devices often rely on a single process for purification; on the other hand, traditional devices have high energy consumption and the overall heating method results in serious energy waste.

[0004] This utility model is implemented as follows: A nitric acid purification device includes a raw material storage tank, a multi-stage oxidation device, and a high-efficiency distillation column. The multi-stage oxidation device is connected to the raw material storage tank and the high-efficiency distillation column through a feed pipe and a discharge pipe, respectively. The multi-stage oxidation device is divided into a primary oxidation unit and a deep oxidation unit. The high-efficiency distillation column is equipped with high-efficiency packing material, and an outlet pipe is installed at the top of one side of the high-efficiency distillation column. A condenser is installed in the outlet pipe, and a finished product box is installed at one end of the outlet pipe.

[0005] In a preferred embodiment of this utility model, the primary oxidation unit includes an oxidation reaction nozzle. Multiple uniformly distributed oxidation reaction nozzles are installed on one side of the inner wall of the multi-stage oxidation device. One end of each oxidation reaction nozzle is connected to an oxidant addition pipe, and the oxidant addition pipe is fixedly installed on the outside of the multi-stage oxidation device. The feed end of the oxidation reaction nozzle passes through one side of the multi-stage oxidation device and is connected to the oxidant addition pipe.

[0006] In a preferred embodiment of this utility model, the deep oxidation unit includes an oxidation reaction filter. The oxidation reaction filter is symmetrically and alternately fixedly installed on both sides of the inner wall of the multi-stage oxidation device, and the oxidation reaction filter is inclined. A screening hole is provided on one side of the multi-stage oxidation device, and one end of the lower oxidation reaction filter passes through the screening hole and extends to the outside.

[0007] In a preferred embodiment of this invention, a collection box is fixedly installed at the bottom of one side of the multi-stage oxidation device, and the collection box is located directly below the screening hole.

[0008] In a preferred embodiment of this invention, a heating module is fixed to the inner wall of the high-efficiency distillation column. This heating module comprises a heating element, insulation material, a temperature sensor, and a control circuit. The heating power is controlled by adjusting the current of the heating element through the control circuit, and precise temperature control is achieved by monitoring the temperature through the temperature sensor. In nitric acid purification equipment, it promotes nitric acid vaporization, maintains gas-liquid balance within the distillation column, and adapts to the heating needs of different parts of the column. It is crucial for improving nitric acid purity and reducing energy consumption. The high-efficiency packing uses PP conjugate ring / yoke ring packing.

[0009] In a preferred embodiment of this utility model, a first rotating shaft is fixedly installed between the two sides of the inner wall of the high-efficiency distillation column, and a plurality of stirring rods are fixedly installed on the first rotating shaft. A motor is fixedly installed on the outer side of the high-efficiency distillation column, and the output end of the motor passes through the high-efficiency distillation column and is fixedly connected to one end of the first rotating shaft. The first rotating shaft is located at the center of the high-efficiency distillation column.

[0010] In a preferred embodiment of this invention, a second rotating shaft is rotatably mounted on the top of the inner wall of the high-efficiency distillation column, a first bevel gear is fixedly mounted on the bottom of the second rotating shaft, and a second bevel gear is fixedly mounted on the first rotating shaft. The first bevel gear and the second bevel gear are meshed together. The top of the second rotating shaft passes through the high-efficiency distillation column, the multi-stage oxidation device, and one of the oxidation reaction filters. Two beating frames are fixedly mounted on the second rotating shaft. The beating frames cooperate with the adjacent oxidation reaction filters. When the second rotating shaft rotates, it drives the beating frames to beat the oxidation reaction filters. A protective box is fixedly mounted on the top of the inner wall of the high-efficiency distillation column, and the first bevel gear and the second bevel gear are installed inside the protective box.

[0011] In a preferred embodiment of this utility model, a whitening tube is fixedly installed inside the air outlet pipe. The whitening tube is U-shaped and has multiple round holes. One end of the whitening tube passes through one side of the air outlet pipe and is fixedly installed with a connector. One end of the connector is connected to an inert gas pipe.

[0012] In a preferred embodiment of this utility model, the high-efficiency distillation column and the finished product box are fixedly installed on a base plate, and a buffer pad is fixedly installed at the bottom end of the base plate.

[0013] In a preferred embodiment of this utility model, a drawer box is slidably installed inside the finished product box, and a handle is installed on one side of the drawer box.

[0014] The beneficial effects of this invention are: high-purity purification: through the primary oxidation unit and deep oxidation unit of the multi-stage oxidation device, combined with the distillation of the high-efficiency distillation tower and the whitening treatment of the whitening tube, various impurities in nitric acid can be removed efficiently and thoroughly, significantly improving the purity of nitric acid and meeting the strict requirements of high-end fields for the purity of nitric acid.

[0015] Energy saving and consumption reduction: The heating module in the high-efficiency distillation column adopts a precise temperature control design. The heating power is adjusted by the control circuit to achieve segmented heating. It can accurately supply heat according to the needs of different stages of the distillation process. Compared with the traditional whole heating method, it greatly reduces energy consumption and saves production costs.

[0016] Easy to operate and maintain: The unit has a reasonable structural design, with each component compactly arranged and clearly defined in function. For example, the oxidation reaction filter can be easily cleaned through the screening holes, and the collection box facilitates the collection of impurities; the drawer box inside the finished product tank allows for easy access to nitric acid. At the same time, the overall structure of the unit is simple, reducing the difficulty of operation and maintenance, decreasing reliance on specialized personnel, and improving production efficiency.

[0017] High equipment stability: The buffer pad at the bottom of the base plate reduces vibration during operation, lowers the risk of damage to equipment components due to vibration, and improves the stability and reliability of equipment operation. Furthermore, the use of suitable corrosion-resistant materials in the construction enhances the equipment's resistance to nitric acid corrosion, extends its service life, and reduces the frequency of equipment replacement and maintenance. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of a nitric acid purification device provided by an embodiment of the present invention;

[0020] Figure 2 A side view of a nitric acid purification apparatus provided for an embodiment of this utility model;

[0021] Figure 3 A cross-sectional view of a nitric acid purification apparatus provided for an embodiment of this utility model;

[0022] Figure 4 A side view of the internal structure of a nitric acid purification device provided for an embodiment of this utility model;

[0023] Figure 5 This is a partial structural diagram of a nitric acid purification device provided for an embodiment of the present invention.

[0024] In the diagram: 110, Raw material storage tank; 120, Multi-stage oxidation unit; 121, Feed pipe; 122, Discharge pipe; 123, Oxidation reaction nozzle; 124, Oxidant addition pipe; 125, Oxidation reaction filter; 126, Collection box; 130, High-efficiency distillation column; 131, Gas outlet pipe; 132, Condenser; 133, Heating module; 134, First rotating shaft; 135, Stirring rod; 136, Motor; 137, Second rotating shaft; 138, Beating frame; 139, Whitening pipe; 140, Finished product box; 141, Drawer box; 150, Base plate. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0026] Please see Figures 1-5 The present invention provides a technical solution: a nitric acid purification device, comprising a raw material storage tank 110, a multi-stage oxidation device 120, and a high-efficiency distillation column 130. The multi-stage oxidation device 120 is connected to the raw material storage tank 110 and the high-efficiency distillation column 130 through a feed pipe 121 and a discharge pipe 122, respectively. The multi-stage oxidation device 120 is divided into a primary oxidation unit and a deep oxidation unit. The high-efficiency distillation column 130 is equipped with high-efficiency packing, and an exhaust pipe 131 is installed at the top of one side of the high-efficiency distillation column 130. A condenser 132 is installed in the exhaust pipe 131, and a finished product box 140 is installed at one end of the exhaust pipe 131. The high-efficiency distillation column 130 and the finished product box 140 are fixedly installed on a base plate 150, and a buffer pad is fixedly installed at the bottom of the base plate 150.

[0027] In some specific implementations, the primary oxidation unit includes oxidation reaction nozzles 123. Multiple uniformly distributed oxidation reaction nozzles 123 are installed on one side of the inner wall of the multi-stage oxidation device 120. One end of each oxidation reaction nozzle 123 is connected to an oxidant addition pipe 124, which is fixedly installed on the outside of the multi-stage oxidation device 120. The feed end of the oxidation reaction nozzle 123 penetrates one side of the multi-stage oxidation device 120 and is connected to the oxidant addition pipe 124. The multiple uniformly distributed nozzles allow the oxidant to be more evenly dispersed in nitric acid, greatly increasing the contact area between the oxidant and nitric acid, allowing the oxidation reaction to proceed more fully. This helps to remove impurities from nitric acid more efficiently, significantly improving the oxidation and impurity removal efficiency of the primary oxidation unit, providing higher-quality raw materials for subsequent purification processes, and ensuring the purification effect of the entire nitric acid purification device.

[0028] In some specific implementations, the deep oxidation unit includes an oxidation reaction filter 125. The oxidation reaction filters 125 are symmetrically and alternately fixedly installed on both sides of the inner wall of the multi-stage oxidation device 120, and are inclined. A screening hole is provided on one side of the multi-stage oxidation device 120, and one end of the lower oxidation reaction filter 125 passes through the screening hole and extends to the outside. The inclined filter facilitates the natural sliding of impurities under gravity. The symmetrical and staggered installation increases the contact path and time between nitric acid and the filter, making the oxidation reaction more complete and further improving the removal effect of impurity ions. The design of the screening hole facilitates the discharge of impurities, preventing impurities from accumulating inside the device and affecting the purification effect and equipment operation, ensuring the continuous and stable operation of the deep oxidation unit. A collection box 126 is fixedly installed at the bottom of one side of the multi-stage oxidation device 120, and the collection box 126 is located directly below the screening hole. It can collect impurities discharged from the screening holes in a timely manner, preventing impurities from being re-mixed into nitric acid and causing secondary pollution. At the same time, it facilitates centralized cleaning of impurities, simplifies the equipment maintenance process, improves the cleanliness and operational stability of the entire purification unit, and ensures the purity and quality of nitric acid purification.

[0029] In some specific implementation schemes, a heating module 133 is fixed to the inner wall of the high-efficiency distillation column 130. The heating module 133 consists of a heating element, insulation material, a temperature sensor, and a control circuit. The heating power is controlled by adjusting the current of the heating element through the control circuit, and precise temperature control is achieved by monitoring the temperature through the temperature sensor. In the nitric acid purification unit, it promotes nitric acid vaporization, maintains the gas-liquid balance within the distillation column, and adapts to the heating needs of different parts of the column. This is crucial for improving nitric acid purity and reducing energy consumption. The high-efficiency packing uses PP conjugated ring / yoke ring packing. The precise temperature control of the heating module provides appropriate heat to the nitric acid according to the distillation requirements, promoting nitric acid vaporization, maintaining the gas-liquid balance within the distillation column, adapting to the heating needs of different parts of the column, and reducing energy consumption. The unique structure of the PP conjugated ring / yoke ring packing increases the gas-liquid contact area, improves mass transfer performance, and enhances the distillation effect. The synergistic effect of these two factors significantly improves the distillation efficiency and purity of nitric acid.

[0030] In some specific implementations, a first rotating shaft 134 is fixedly installed between the two sides of the inner wall of the high-efficiency distillation column 130. Multiple stirring rods 135 are fixedly installed on the first rotating shaft 134. A motor 136 is fixedly installed on the outside of the high-efficiency distillation column 130. The output end of the motor 136 passes through the high-efficiency distillation column 130 and is fixedly connected to one end of the first rotating shaft 134. The first rotating shaft 134 is located at the center of the high-efficiency distillation column 130. The motor 136 drives the first rotating shaft 134 to rotate, causing the stirring rods 135 to stir the nitric acid mixture inside the column. The stirring action allows nitric acid to be heated more evenly, accelerates the vaporization rate of nitric acid, enhances the gas-liquid mass transfer process, effectively improves the distillation efficiency in the distillation column, makes the separation of nitric acid and impurities more thorough, and further improves the purity of the purified nitric acid. A second rotating shaft 137 is rotatably installed at the top of the inner wall of the high-efficiency distillation column 130. A first bevel gear is fixedly installed at the bottom of the second rotating shaft 137. A second bevel gear is fixedly installed on the first rotating shaft 134. The first bevel gear and the second bevel gear are meshed and connected. The top of the second rotating shaft 137 passes through the high-efficiency distillation column 130, the multi-stage oxidation device 120, and one of the oxidation reaction filters 125. Two beaters 138 are fixedly installed on the second rotating shaft 137. The beaters 138 cooperate with the adjacent oxidation reaction filters 125. When the second rotating shaft 137 rotates, it drives the beaters 138 to beat the oxidation reaction filters 125. A protective box is fixedly installed at the top of the inner wall of the high-efficiency distillation column 130. The first bevel gear and the second bevel gear are installed in the protective box. This design can promptly shake off impurities adhering to the filter screen surface, prevent filter screen blockage, maintain the filter screen's permeability and activity, ensure the oxidation reaction proceeds continuously and efficiently, maintain the stable operation of the multi-stage oxidation unit, and thus guarantee the purification effect and production efficiency of the entire nitric acid purification unit.

[0031] In some specific implementation schemes, a whitening pipe 139 is fixedly installed inside the vent pipe 131. The whitening pipe 139 is U-shaped and has multiple round holes. One end of the whitening pipe 139 passes through one side of the vent pipe 131 and is fixedly installed with a connector. One end of the connector is connected to the inert gas pipe. The U-shaped design increases the residence time of the inert gas in the vent pipe, and the round holes allow the inert gas to be evenly dispersed in the nitric acid vapor, which can more thoroughly remove residual nitrogen oxides and other volatile impurities, further improving the purity of nitric acid and ensuring that the nitric acid entering the finished product box 140 is of higher quality, meeting the strict purity requirements of nitric acid in high-end application scenarios.

[0032] In some specific implementation schemes, a drawer box 141 is slidably installed inside the finished product box 140. A handle is installed on one side of the drawer box 141. This design facilitates the handling and storage management of purified nitric acid. Operators can easily pull out or push the drawer box 141 through the handle, which makes it easy to accurately control the amount of nitric acid used, while avoiding contamination of nitric acid during handling, thus improving the convenience and safety of operation.

[0033] Working principle: Oxidation and impurity removal stage: The nitric acid to be purified is stored in the raw material storage tank 110. The nitric acid flows into the primary oxidation unit of the multi-stage oxidation device 120 through the feed pipe 121. In the primary oxidation unit, the oxidant is sprayed into the nitric acid through the oxidant addition pipe 124 by multiple evenly distributed oxidation reaction nozzles 123, where it is fully mixed with the nitric acid to oxidize and remove some impurities.

[0034] The oxidized nitric acid enters the deep oxidation unit, where inclined oxidation reaction filters 125 are symmetrically and alternately fixed on both sides of the inner wall. As the nitric acid flows through the oxidation reaction filters 125, impurity ions are further removed under the catalytic oxidation effect of the filters. The precipitates or complexes formed after the impurity ions react slide down the inclined filters, pass through the screening holes on one side of the multi-stage oxidation device 120, and fall into the collection box 126 directly below the screening holes, thus achieving separation from the nitric acid.

[0035] Distillation and Separation Stage: After oxidation and impurity removal, the nitric acid enters the high-efficiency distillation column 130 through the discharge pipe 122. The heating module 133, fixed to the inner wall of the high-efficiency distillation column 130, begins operation. The heating module 133 controls the heating power by adjusting the current of the heating element through a control circuit, and precise temperature control is achieved by monitoring the temperature with a temperature sensor. The heat generated by the heating module 133 promotes the vaporization of nitric acid, maintaining the gas-liquid balance within the distillation column. Simultaneously, the PP conjugate ring / yoke-shaped ring packing inside the high-efficiency distillation column 130 increases the gas-liquid contact area, improving distillation efficiency. Furthermore, the motor 136 drives the first rotating shaft 134 to rotate, and the stirring rod 135 on the first rotating shaft 134 rotates accordingly, stirring the nitric acid mixture and ensuring more uniform heating of the nitric acid, further enhancing the distillation effect.

[0036] Whitening and Collection Stage: Nitric acid vapor after distillation is discharged through outlet pipe 131. Within outlet pipe 131, it is cooled and condensed into liquid by condenser 132. Inert gas is then introduced through U-shaped whitening pipe 139. The circular holes on whitening pipe 139 ensure uniform dispersion and reaction of the inert gas. Finally, it flows into finished product box 140 for storage. Drawer box 141 inside finished product box 140 allows for easy removal of stored nitric acid, and a handle on one side of drawer box 141 facilitates operation. The entire device is mounted on base plate 150, and the buffer pad at the bottom of base plate 150 acts as a shock absorber, reducing the impact of vibrations generated during operation on the equipment and the surrounding environment.

[0037] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A purification apparatus for nitric acid, characterized by comprising: The utility model relates to a high -efficient rectifying tower of raw material storage tank, multistage oxidation device and including, multistage oxidation device is connected with raw material storage tank and high -efficient rectifying tower respectively through feed pipe and discharge pipe, and multistage oxidation device is divided into preliminary oxidation unit and depth oxidation unit in, high -efficient rectifying tower is provided with high -efficient filler, and high -efficient rectifying tower one side top end is installed with outlet pipe, and outlet pipe is installed with condenser in, and outlet pipe one end is installed with finished product box.

2. A purification apparatus for nitric acid according to claim 1, characterized in that The preliminary oxidation unit includes oxidation reaction nozzles, a plurality of oxidation reaction nozzles are uniformly distributed and mounted on one side of the inner wall of the multistage oxidation device, one end of the oxidation reaction nozzle is connected with an oxidizing agent adding pipeline, and the oxidizing agent adding pipeline is fixedly installed on the outside of the multistage oxidation device.

3. A purification apparatus for nitric acid according to claim 1, characterized in that, The depth oxidation unit includes oxidation reaction screens, the oxidation reaction screens are fixedly installed on both sides of the inner wall of the multistage oxidation device in a symmetrical staggered manner, and the oxidation reaction screens are arranged in an inclined manner, a screening hole is arranged on one side of the multistage oxidation device, and one end of the oxidation reaction screen below extends to the outside through the screening hole.

4. A purification apparatus for nitric acid according to claim 3, characterized in that A collection box is fixedly installed at the bottom end of one side of the multistage oxidation device, and the collection box is arranged directly below the screening hole.

5. The apparatus for purification of nitric acid according to claim 1, characterized in that, A heating module is fixedly installed on the inner wall of the high-efficiency rectifying tower, and the heating module comprises a heating element, a heat insulation material, a temperature sensor, and a control circuit.

6. A purification apparatus for nitric acid according to claim 3, characterized in that A first rotating shaft is fixedly installed between the inner walls of the high-efficiency rectifying tower, a plurality of stirring rods are fixedly installed on the first rotating shaft, an electric motor is fixedly installed on the outside of the high-efficiency rectifying tower, and the output end of the electric motor penetrates the high-efficiency rectifying tower and is fixedly connected to one end of the first rotating shaft.

7. A purification apparatus for nitric acid according to claim 6, characterized in that A second rotating shaft is rotatably installed at the top end of the inner wall of the high-efficiency rectifying tower, a first bevel gear is fixedly installed at the bottom end of the second rotating shaft, a second bevel gear is fixedly installed on the first rotating shaft, the first bevel gear and the second bevel gear are meshingly connected, the second rotating shaft penetrates the high-efficiency rectifying tower, the multistage oxidation device, and one of the oxidation reaction screens, two beating frames are fixedly installed on the second rotating shaft, and the beating frames cooperate with adjacent oxidation reaction screens.

8. A purification plant of nitric acid according to claim 1, characterized in that, A white blowing pipe is fixedly installed in the outlet pipe, the white blowing pipe is arranged in a U shape, a plurality of round holes are arranged on the white blowing pipe, one end of the white blowing pipe penetrates one side of the outlet pipe and is fixedly connected to a connecting piece, and one end of the connecting piece is connected to an inert gas pipe.

9. The apparatus for purification of nitric acid according to claim 1, characterized in that, The high-efficiency rectifying tower and the finished product box are fixedly installed on a bottom plate.

10. The apparatus for purification of nitric acid according to claim 1, characterized in that, A drawer box is slidably installed in the finished product box, and a handle is installed on one side of the drawer box.

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