Electronic-grade nitric acid continuous pretreatment system
By using a series of multi-stage glass coolers and aerodynamic mixing, the problems of easy leakage during stirring and sealing and poor production environment in the preparation of electronic-grade nitric acid have been solved, achieving efficient and safe continuous production and improving product quality and production efficiency.
Patent Information
- Application Number
- CN202423212307.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-25
- Publication Date
- 2025-11-25
- Estimated Expiration
- 2034-12-25
AI Technical Summary
In the existing process for preparing electronic-grade nitric acid, the stirring and sealing are prone to leakage, and the production environment is poor, which affects product quality and safety.
A multi-stage glass cooler is connected in series. Nitric acid and water are continuously fed in and mixed using pneumatic power to avoid mechanical stirring. Combined with exhaust gas treatment and specific gravity detection, the concentration and purity are ensured. Non-metallic pipes are used to reduce corrosion.
It improved product quality, enhanced the production environment, enabled continuous production, and increased production efficiency and safety.
Smart Images
Figure CN223587022U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to electronic grade nitric acid processing technical field, especially relates to a kind of electronic grade nitric acid continuous pretreatment system. BACKGROUND
[0002] Electronic grade nitric acid is a kind of high-purity nitric acid, and its purity requirement is extremely high, and it is usually used to manufacture high-tech products such as semiconductor, optoelectronic components and the like. The raw material of electronic grade nitric acid can be nitrobenzene, phenol and the like, and these compounds can obtain electronic grade nitric acid after nitration. In addition, toluene, benzaldehyde and the like can also be used as raw materials for preparing electronic grade nitric acid. At the same time, high-purity nitric acid and nitric acid and other reagents, as well as pure water, are also needed in the preparation process. As an electronic chemical, electronic grade nitric acid has a wide range of applications in integrated circuit manufacturing, display panel manufacturing and photovoltaic industry, and thus its market demand continues to grow, and its preparation technology is constantly improving, so its processing industry is particularly important.
[0003] However, the conventional electronic nitric acid raw material is diluted from industrial concentrated nitric acid (98%) to 68%~70% nitric acid, and then rectified. The dilution process of nitric acid is generally to add clean water to a stainless steel reactor with stirring, and to cool it by using a jacket and a coil. Since high-temperature nitric acid is easy to corrode stainless steel, the metal ions in the diluted nitric acid increase; the production is intermittent; the stirring seal is easy to leak, and the production environment is poor. UTILITY MODEL CONTENTS
[0004] The purpose of the present application is to provide a continuous pretreatment system for electronic grade nitric acid, which can improve the problems of easy leakage of the seal during stirring and poor production environment.
[0005] The technical scheme adopted by the utility model is as follows: a continuous pretreatment system for electronic grade nitric acid, the system comprises:
[0006] An input unit is used to input raw materials into the system, a flowmeter is arranged on the input unit, the flowmeter is used to measure the flow of the input raw materials, and the output end of the input unit is connected with a mixed condensation unit; the mixed condensation unit comprises a plurality of mixed condensers, the input end of the mixed condenser is connected with the output end of the input unit, the output end of the mixed condenser is connected with an intermediate tank, and the mixed substances output by the mixed condenser are temporarily stored in the intermediate tank; wherein the input unit is used to deliver the raw materials to the mixed condensation unit for cooling and mixing, and the raw materials are subjected to staged cooling by the plurality of mixed condensers.
[0007] Due to the above structure, the mixed liquid is subjected to multi-stage cooling, and the concentration of nitric acid is adjusted by controlling the amount of raw materials input by the input unit, so that the output mixed liquid can reach the set temperature and concentration.
[0008] Further, in order to adjust the concentration of nitric acid in real time, the mixing condensing unit is provided with multiple input ends, including a first input end, a second input end and a third input end, which are used to receive the raw materials output by the input unit; the first input end is located on the side wall of the mixing condenser, and the input unit is connected with the mixing condenser through the first input end; the second input end is located on the top of the mixing condenser; and the third input end is in communication with the bottom of the mixing condensing unit.
[0009] Further, in order to accurately and quickly cool the raw materials, the mixing condensers are connected in series to form a mixing condensing unit, and the multiple mixing condensers are connected through pipelines, and the mixing condensers are used for grading mixing and condensing of the input raw materials.
[0010] Further, in order to detect the concentration and quality of the output mixed liquid in real time, the output end of the mixing condensing unit is connected with an intermediate tank through a hydrometer, and the hydrometer is arranged on the connecting pipeline between the mixing condensing unit and the intermediate tank, and is used to detect the concentration of the mixed substance in real time.
[0011] Further, in order to reduce environmental pollutants, the system further comprises a tail gas treatment unit connected with the mixing condensing unit through a tail gas absorption pipeline, and the tail gas generated in the mixing condensing process is treated by the tail gas treatment unit.
[0012] Further, in order to better control the input raw materials and make the system produce continuously, a valve is arranged on the input unit, and the valve is used to control the opening and closing of the input end of the input unit.
[0013] Further, in order to transport the mixed liquid stored in the intermediate tank, a discharge port is arranged on the lower side of the intermediate tank, and a high tank is connected with the discharge port, and the high tank provides the transport power for the mixed substance in the intermediate tank.
[0014] Further, in order to reduce the corrosion of the equipment and improve the product quality, the mixing condenser is made of glass.
[0015] Further, in order to reduce the corrosion of the equipment and reduce the influence on the product, the pipeline is made of non-metal material.
[0016] Further, in order to not use mechanical stirring, the first input end is used to input concentrated nitric acid; the second input end is used to input water medium; and the third input end is used to input air, which is used to provide power for the system.
[0017] As described above, due to the adoption of the above technical scheme, the beneficial effects of the present application are:
[0018] 1. The multiple glass coolers are connected in series, and nitric acid and clean water are continuously input, and the mixed liquid is cooled while being mixed. The glass device is not easy to be corroded, and no mechanical stirring is used, and the sealing part is not easy to leak, so that the product quality is improved, and the production environment is improved.
[0019] 2. The device has simple structure, and the raw materials are continuously input at the input end, so that the device can continuously produce, the production speed is fast, and the production efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS
[0020] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and should not be regarded as limiting the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.
[0021] Figure 1 It is a schematic diagram of the system structure of the present application;
[0022] Figure 2 It is a schematic diagram of the mixed condensing unit structure of the present application;
[0023] Figure 3 It is a schematic diagram of the intermediate tank structure of the present application.
[0024] Reference signs: 1, input unit; 101, first input end; 102, second input end; 103, third input end; 2, mixed condensing unit; 3, intermediate tank; 401, flow meter; 402, specific gravity meter; 5, tail gas treatment unit; 501, tail gas absorption pipeline; 6, high tank. DETAILED DESCRIPTION
[0025] The present application will be described in detail below with reference to the drawings.
[0026] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application will be further described in detail below with reference to the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application, and are not used to limit the present application.
[0027] As shown in the figure, a continuous pretreatment system for electronic grade nitric acid, the system comprises: Figure 1 An input unit 1 is used for inputting raw materials to the system, and a flow meter 401 is arranged on the input unit 1, the flow meter 401 is used for measuring the flow of the input raw materials, and the output end of the input unit 1 is connected with the mixed condensing unit 2;
[0028]
[0029] The input unit 1 is provided with a plurality of nitric acid raw material input ports, liquid water raw material medium input ports and air raw material input ports, and valves are arranged on each input unit 1 to facilitate the control of the raw material input of each input port.
[0030] The mixed condensing unit 2 comprises a plurality of mixed condensers, the input ends of the mixed condensers are connected with the output ends of the input units 1, and the output ends of the mixed condensers are connected with the intermediate tank 3.
[0031] The first input end 101 is located on the side wall of the mixed condenser, the input unit 1 is connected with the mixed condenser through the first input end 101, the second input end 102 is located on the top of the mixed condenser, and the third input end 103 is in communication with the bottom of the mixed condensing unit 2.
[0032] The first input end 101 is a concentrated nitric acid pipeline, the second input end 102 is a liquid water pipeline, and the third pipeline is an air pipeline.
[0033] The input unit 1 is used for conveying raw materials to the mixed condensing unit 2 for cooling and mixing, and the raw materials are subjected to staged cooling by the plurality of mixed condensers.
[0034] The system further comprises a tail gas treatment unit 5, the tail gas treatment unit 5 is connected with the mixed condensing unit 2 through a tail gas absorption pipeline, and the tail gas treatment unit 5 is used for centralized treatment of tail gas generated in the mixed condensing process.
[0035] The working process is as follows: the input unit 1 inputs raw materials according to actual needs, the flow meter 401 is used for measuring the flow of the raw materials input by the input unit 1, and the opening and closing of the input end are controlled through the valve; the raw materials enter the mixed condensing unit 2 for mixing and cooling, and then output mixed liquid; the mixed liquid is measured by the specific gravity meter 402, and if it meets the standard, it is stored in the intermediate tank 3, and if it does not meet the standard, it is returned to the mixed condensing unit 2 for mixing again; the gas generated in the raw material mixing process enters the tail gas treatment unit 5 through the tail gas absorption pipeline for treatment.
[0036] Embodiment 1
[0037] As shown in Figure 2 In order to avoid the problem that mechanical stirring causes damage to the connection of the pipeline and the like and causes leakage, an embodiment of the utility model discloses a continuous electronic-grade nitric acid pretreatment system which comprises a plurality of input units 1, mixed condensers and a tail gas treatment unit 5.
[0038] The concentrated nitric acid is diluted and cooled by a water medium, air provides compressed power for the mixed liquid in the mixed condenser, and the mixed liquid is transported to the next mixed condenser by air, and after the mixed liquid is cooled and diluted by the multi-stage mixed condenser, the mixed liquid is transported to the next process by air.
[0039] The system is powered by air, and the sealing of the pipeline and the like is not affected by mechanical operation, so that the pipeline is ensured to be leak-free.
[0040] Embodiment 2
[0041] As shown in Figure 1 Another embodiment of the utility model is that, in order to reduce the generation of metal ions in the process of dilution and cooling of nitric acid, the pipeline in the system is made of non-metallic material, and the equipment is also made of non-metallic material, wherein the mixed condenser is made of glass material.
[0042] During the dilution and cooling of nitric acid, the nitric acid at a high temperature can cause corrosion to stainless steel and the like, thereby increasing the metal ions in the nitric acid and affecting the purity of the output nitric acid, so as to improve the quality of the output product.
[0043] Embodiment 3
[0044] As shown in Figure 3 Another embodiment of the utility model is that the input end of the intermediate tank 3 is connected with the mixed condensing unit 2, a discharge port is arranged on the lower side of the intermediate tank 3, and the discharge port is connected with the high tank 6, and the high tank 6 provides conveying power for the mixed substance in the intermediate tank 3.
[0045] The intermediate tank 3 is used for temporarily storing the mixed liquid, and when the mixed liquid needs to be output, the high tank 6 provides conveying power for the intermediate tank 3.
[0046] The input end of the intermediate tank 3 is provided with a specific gravity meter 402, and the concentration of the mixed liquid is detected in real time by the specific gravity meter 402, if the concentration of the mixed liquid does not reach the set value, the mixed liquid is re-conveyed to the mixed condensing unit 2 for dilution or concentration, and after the mixed liquid reaches the set value, it is stored in the intermediate tank 3.
[0047] The system has a simple structure, and since the input unit 1 continuously inputs raw materials, the entire system will continuously work, if the generated mixed liquid is not timely processed, the entire system will be stagnant, so the intermediate tank 3 is arranged to temporarily store the generated mixed liquid for standby detection.
[0048] Embodiment 4
[0049] On the basis of the foregoing embodiment, the utility model still can adopt as follows setting mode, in order to improve the applicability of system, if needing to heat the material in system, can input hot water or low pressure steam in input unit 1, thereby heating the material in system. Similarly, can adjust the material of input unit 1 according to different use demand, thereby improving the universality of system.
[0050] The above merely describes the preferred embodiments of the present utility model, and is not intended to limit the present utility model, and any modification, equivalent replacement and improvement, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.
Claims
1. A continuous pretreatment system for electronic-grade nitric acid, characterized in that, The system includes: An input unit is used to input raw materials into the system. The input unit is equipped with a flow meter, which is used to measure the flow rate of the input raw materials. The output end of the input unit is connected to the mixing and condensing unit. The mixing and condensing unit includes multiple mixing condensers. The input end of the mixing condenser is connected to the output end of the input unit, and the output end of the mixing condenser is connected to an intermediate tank. The intermediate tank temporarily stores the mixed substances output from the mixing condenser. The input unit is used to transport raw materials to the mixing and condensing unit for cooling and mixing, and multiple mixing condensers perform staged cooling of the raw materials.
2. The continuous pretreatment system for electronic-grade nitric acid according to claim 1, characterized in that, The mixing and condensing unit is provided with multiple input terminals, including a first input terminal, a second input terminal and a third input terminal, which are used to receive raw materials output by the input unit; The first input terminal is located on the side wall of the mixing condenser, and the input unit is connected to the mixing condenser through the first input terminal; the second input terminal is located on the top of the mixing condenser; and the third input terminal is connected to the bottom of the mixing condenser unit.
3. The continuous pretreatment system for electronic-grade nitric acid according to claim 1, characterized in that, The mixing condensers are connected in series to form a mixing condensation unit. Multiple mixing condensers are connected by pipes. The mixing condensers are used to perform graded mixing and condensation of the input raw materials.
4. The continuous pretreatment system for electronic-grade nitric acid according to claim 1, characterized in that, The output of the mixing and condensing unit is connected to the intermediate tank via a hydrometer, which is installed on the connecting pipe between the mixing and condensing unit and the intermediate tank to detect the concentration of the mixed substances in real time.
5. The continuous pretreatment system for electronic-grade nitric acid according to claim 1, characterized in that, The system also includes an exhaust gas treatment unit, which is connected to the mixing and condensing unit through an exhaust gas absorption pipeline. The exhaust gas generated during the mixing and condensing process is centrally treated by the exhaust gas treatment unit.
6. The continuous pretreatment system for electronic-grade nitric acid according to claim 1, characterized in that, The input unit is equipped with a valve, which is used to control the opening or closing of the input terminal of the input unit.
7. The continuous pretreatment system for electronic-grade nitric acid according to claim 1, characterized in that, The intermediate tank has a discharge port on its lower side, and the discharge port is connected to a high-level trough, which provides the conveying power for the mixed material in the intermediate tank.
8. The continuous pretreatment system for electronic-grade nitric acid according to claim 1, characterized in that, The mixing condenser is made of glass.
9. The continuous pretreatment system for electronic-grade nitric acid according to claim 3, characterized in that, The pipe is made of non-metallic material.
10. The continuous pretreatment system for electronic-grade nitric acid according to claim 2, characterized in that, The first input is used to input concentrated nitric acid; the second input is used to input water; and the third input is used to input air.