Fluorine-nitrogen mixed gas purification system
By designing a fluorine-nitrogen mixed gas purification system, the primary dust removal device, condensation device, adsorption device and secondary dust removal device are used to gradually remove HF and impurities in fluorine gas, solving the problem that impurities in electrolytic fluorine-making products affect purity, achieving efficient removal of impurities and improving the purity of fluorine gas.
Patent Information
- Application Number
- CN202421356307.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-14
- Publication Date
- 2025-03-18
- Estimated Expiration
- 2034-06-14
AI Technical Summary
In the prior art, fluorine gas produced by electrolytic fluorine contains impurities such as HF and electrolyte, which affects the purity of fluorine gas.
A fluorine-nitrogen mixed gas purification system is designed, including a primary dust removal device, a condensation device, an adsorption device and a secondary dust removal device. Through these devices, HF, electrolytes and other impurities in the fluorine gas are gradually removed to ensure the purity of the fluorine gas.
This system can efficiently remove the HF components entrained in fluorine gas, significantly improve the purity of fluorine gas, and ensure the quality of subsequent reactions.
Smart Images
Figure CN222624115U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of fluorine-nitrogen mixed gas separation, and more specifically to a fluorine-nitrogen mixed gas purification system. Background Art
[0002] Fluorine gas is a very corrosive yellowish diatomic gas with a strong pungent odor. It is also a strong oxidant. At room temperature, it can combine with almost all elements and generate a large amount of heat energy. Fluorine-containing mixed gases, such as fluorine-nitrogen mixed gases, have similar physical and chemical properties to fluorine gas. Since the preparation of carbon tetrafluoride is an exothermic reaction between fluorine gas and carbon, in order to reduce the temperature of the equipment, fluorine-nitrogen mixed gases are often used instead of fluorine gas to react with carbon. The existing method for preparing fluorine-nitrogen mixed gases is to use the electrolytic fluorine production process to produce fluorine gas and nitrogen for mixing.
[0003] The electrolytic production of fluorine uses KHF2 mixed with anhydrous HF to make an electrolyte. When electrolysis occurs in the electrolytic cell, KF plays an ion migration role, and the fluoride ions on the anode are reduced to fluorine gas through electrolysis. However, the fluorine gas at the outlet of the electrolytic cell contains impurities such as HF and electrolyte, which will affect the purity of the fluorine gas and further affect the subsequent reactions.
[0004] Therefore, how to solve the problem that fluorine gas produced by electrolytic fluorine production contains impurities such as HF and electrolyte is an urgent problem to be solved by those skilled in the art. Utility Model Content
[0005] In view of this, the purpose of the utility model is to provide a fluorine-nitrogen mixed gas purification system, which can efficiently remove the HF component entrained in the fluorine gas at the outlet of the fluorine production electrolytic cell to ensure the purity of the fluorine gas.
[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:
[0007] A fluorine-nitrogen mixed gas purification system, comprising:
[0008] A primary dust removal device, the input end of which is connected to the output end of the production device, the production device is used to produce a fluorine-nitrogen mixed gas, and the input end of the production device is connected to an electrolytic cell for electrolytic fluorine production;
[0009] A condensing device is connected to the output end of the primary dust removal device, and the condensing device is also connected to the liquid nitrogen storage tank;
[0010] The adsorption device has an input end connected to the condensation device, an output end connected to the secondary dust removal device, and the secondary dust removal device is connected to the gas storage tank.
[0011] Preferably, the primary dust removal device includes at least two dust collectors, which are arranged in series through pipelines, an air inlet is provided in the circumference of the dust collector, an air outlet is provided at the top of the dust collector, and a discharge port is provided at the bottom of the dust collector.
[0012] Preferably, the condensing device includes at least two condensers, which are arranged in series through pipelines, and the top of the condenser is provided with an air inlet connected to the dust collector, an air inlet connected to the liquid nitrogen storage tank, and an air outlet connected to the adsorption device, and the bottom of the condenser is provided with a discharge port and an exhaust port.
[0013] Preferably, the discharge port is connected to the hydrofluoric acid collecting tank through a pipeline, the discharge port of the hydrofluoric acid collecting tank is connected to the hydrofluoric acid recovery device through a pipeline, the discharge port is provided with a discharge valve, and the pipeline is provided with a hydrofluoric acid delivery pump.
[0014] Preferably, the adsorption device comprises at least two adsorption towers, which are arranged in parallel through pipelines, an air inlet is provided at the bottom of the adsorption tower, an air outlet is provided at the top of the adsorption tower, and the air inlet of the adsorption tower is connected to the condenser through a pipeline.
[0015] Preferably, the secondary dust removal device includes at least two dust collectors, which are arranged in series through pipelines, an air inlet is provided on the circumference of the dust collector, an air outlet is provided on the top of the dust collector, and a discharge port is provided at the bottom of the dust collector. The air inlet of the dust collector is connected to the air outlet of the adsorption tower through a pipeline.
[0016] Preferably, it also includes a control device for controlling the dust collector, the condenser, the adsorption tower, the drain valve and the hydrofluoric acid delivery pump.
[0017] Preferably, a one-way valve is provided on each pipeline, and the one-way valve is connected to the control device.
[0018] Preferably, the hydrofluoric acid collection tank is provided with a liquid level detector for detecting the liquid level, and the liquid level detector is connected to the control device.
[0019] The fluorine-nitrogen mixed gas purification system provided by the utility model comprises a primary dust removal device, a condensation device, an adsorption device and a secondary dust removal device. Specifically, the input end of the primary dust removal device is connected to the output end of the production device, the production device is used to produce the fluorine-nitrogen mixed gas, the input end of the production device is connected to the electrolytic cell for electrolytic fluorine production, the fluorine gas produced by the electrolytic cell is entrained with HF, electrolyte and other impurities and enters the production device, and is mixed with nitrogen in a certain proportion in the production device to form a fluorine-nitrogen mixed gas, and the prepared fluorine-nitrogen mixed gas enters the primary dust removal device to preliminarily remove the electrolyte particles entrained by the fluorine gas.
[0020] The condensing device is connected to the output end of the primary dust removal device and is also connected to the liquid nitrogen storage tank. The fluorine-nitrogen mixed gas that has passed through the primary dust removal device enters the condensing device, and liquid nitrogen is introduced into the condensing device at the same time to separate most of the HF entrained in the fluorine-nitrogen mixed gas by low-temperature liquefaction. The input end of the adsorption device is connected to the condensing device, and the fluorine-nitrogen mixed gas that has undergone preliminary HF removal enters the adsorption device to further remove the residual trace HF in the fluorine-nitrogen mixed gas. The output end of the adsorption device is connected to the secondary dust removal device to remove the adsorbent that may be entrained in the fluorine-nitrogen mixed gas, and finally a fluorine-nitrogen mixed gas without HF is obtained. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.
[0022] Figure 1 This is a schematic diagram of the structure of the fluorine-nitrogen mixed gas purification system provided by the utility model.
[0023] Reference numerals:
[0024] 1- Primary dust removal device;
[0025] 2- Production equipment;
[0026] 3- Condensation device;
[0027] 4-Liquid nitrogen storage tank;
[0028] 5- Adsorption device;
[0029] 6- Secondary dust removal device;
[0030] 7- Gas tank;
[0031] 8-Hydrofluoric acid collection tank;
[0032] 9-Hydrofluoric acid recovery device;
[0033] 10-Hydrofluoric acid delivery pump. DETAILED DESCRIPTION
[0034] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0035] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0036] The core of the utility model is to provide a fluorine-nitrogen mixed gas purification system, which can efficiently remove the HF component entrained in the fluorine gas at the outlet of the fluorine-making electrolytic cell, thereby ensuring the purity of the fluorine gas.
[0037] Please refer to Figure 1 A fluorine-nitrogen mixed gas purification system includes a primary dust removal device 1, a production device 2, a condensation device 3, a liquid nitrogen storage tank 4, an adsorption device 5, a secondary dust removal device 6 and a gas storage tank 7.
[0038] Specifically, the input end of the primary dust removal device 1 is connected to the output end of the production device 2. The production device 2 is used to produce a fluorine-nitrogen mixed gas. The input end of the production device 2 is connected to an electrolytic cell for electrolytic fluorine production. The fluorine gas produced by the electrolytic cell enters the production device 2 together with HF, electrolyte and other impurities. After being mixed with nitrogen in a certain proportion in the production device 2, a fluorine-nitrogen mixed gas is formed. The prepared fluorine-nitrogen mixed gas enters the primary dust removal device 1 to preliminarily remove the electrolyte particles entrained in the fluorine gas.
[0039] The condensing device 3 is connected to the output end of the primary dust removal device 1, and is also connected to the liquid nitrogen storage tank 4. The fluorine-nitrogen mixed gas passing through the primary dust removal device 1 enters the condensing device 3, and liquid nitrogen is introduced into the condensing device 3 at the same time to separate most of the HF entrained in the fluorine-nitrogen mixed gas by low-temperature liquefaction. The input end of the adsorption device 5 is connected to the condensing device 3, and the fluorine-nitrogen mixed gas that has been preliminarily HF-free enters the adsorption device 5 to further remove the residual trace HF in the fluorine-nitrogen mixed gas. The output end of the adsorption device 5 is connected to the secondary dust removal device 6, and the secondary dust removal device 6 is connected to the gas storage tank 7 to remove the adsorbent that may be entrained in the fluorine-nitrogen mixed gas, and finally the fluorine-nitrogen mixed gas without HF is obtained and stored in the gas storage tank 7.
[0040] The fluorine-nitrogen mixed gas purification system arranged in the above manner can efficiently remove the HF component entrained in the fluorine gas at the outlet of the fluorine-producing electrolytic cell, thereby ensuring the purity of the fluorine gas.
[0041] In the above embodiment, the primary dust removal device 1 includes at least two dust collectors, which are arranged in series through pipelines, with air inlets arranged around the dust collectors, air outlets arranged on the top of the dust collectors, and discharge ports arranged at the bottom of the dust collectors.
[0042] It should be noted that the fluorine gas produced by the electrolytic cell is entrained with HF, electrolyte and other impurities and enters the production device 2. It is mixed with nitrogen in a certain proportion in the production device 2 to form a fluorine-nitrogen mixed gas. The prepared fluorine-nitrogen mixed gas enters the dust collector from the air inlet to preliminarily remove the electrolyte particles entrained by the fluorine gas. The gas treated by the dust collector is discharged from the air outlet and enters the next dust collector from the air inlet of the next dust collector. In this way, it passes through multiple dust collectors in turn for preliminary filtration. After the dust collector has been used for a long time, the electrolyte particles and the like in the dust collector are discharged from the dust collector through the discharge port at the bottom of the dust collector.
[0043] Among them, the air inlet is arranged in the circumference of the dust collector to prevent the gas entering the dust collector from being directly discharged from the air outlet before being dust-removed. The gas entering the dust collector generally rises, and the air outlet is arranged at the top of the dust collector to facilitate the discharge of the gas. The bottom of the dust collector is provided with a discharge port to facilitate the discharge of impurities and the like from the dust collector. In actual applications, there is no restriction on the specific setting positions of the air inlet, air outlet and discharge port, as long as the above-mentioned technical effects can be achieved.
[0044] In this embodiment, two dust collectors are provided, but in practical applications, there is no limitation on the number of dust collectors as long as the above-mentioned technical effects can be achieved.
[0045] In the above case, the condensing device 3 includes at least two condensers, and at least two condensers are arranged in series through pipelines. The top of the condenser is provided with an air inlet connected to the dust collector, an air inlet connected to the liquid nitrogen storage tank 4, and an air outlet connected to the adsorption device 5, and the bottom of the condenser is provided with a discharge port and an exhaust port.
[0046] It can be understood that the liquid nitrogen in the liquid nitrogen storage tank 4 enters the condenser from the air inlet of the condenser, the gas treated once by the dust collector enters the interior of the condenser from the air inlet of the condenser, and most of the HF entrained in the mixed gas is separated by low-temperature liquid nitrogen. The treated mixed gas is discharged from the gas outlet and enters the adsorption device 5 for the next step of treatment, and the hydrofluoric acid is discharged from the discharge port of the condenser to the next container.
[0047] Among them, the air inlet, air outlet, exhaust port and discharge port of the condenser are arranged in this way, but in practical applications, there is no limitation on this. In this embodiment, two condensers are arranged, but in practical applications, there is no limitation on this, as long as the above-mentioned technical effects can be achieved.
[0048] Furthermore, the discharge port is connected to the hydrofluoric acid collecting tank 8 through a pipeline, the discharge port of the hydrofluoric acid collecting tank 8 is connected to the hydrofluoric acid recovery device 9 through a pipeline, the discharge port is provided with a discharge valve, and a hydrofluoric acid delivery pump 10 is provided on the pipeline.
[0049] It should be noted that the hydrofluoric acid separated out in the condenser enters the hydrofluoric acid collecting tank 8 through the discharge port. When the hydrofluoric acid in the hydrofluoric acid collecting tank 8 is full, the drain valve and the hydrofluoric acid delivery pump 10 are opened to deliver the hydrofluoric acid in the hydrofluoric acid collecting tank 8 to the hydrofluoric acid recovery device 9, and the hydrofluoric acid is processed by the hydrofluoric acid recovery device 9.
[0050] In the above embodiment, the adsorption device 5 includes at least two adsorption towers, which are arranged in parallel through pipelines, an air inlet is provided at the bottom of the adsorption tower, an air outlet is provided at the top of the adsorption tower, and the air inlet of the adsorption tower is connected to the condenser through a pipeline.
[0051] It can be understood that the mixed gas treated by the condenser enters the adsorption tower from the air inlet of the adsorption tower, the adsorbent in the adsorption tower removes the residual trace HF in the mixed gas, and finally is discharged from the air outlet of the adsorption tower to the next container.
[0052] Among them, in this embodiment, two adsorption towers are provided, but in actual application, there is no restriction on the number of adsorption towers, and there is no restriction on the positions of the air inlets and outlets of the adsorption towers, as long as the above-mentioned technical effects can be achieved.
[0053] Based on the above embodiment, the secondary dust removal device 6 includes at least two dust collectors, which are arranged in series through pipelines. An air inlet is provided in the circumference of the dust collector, an air outlet is provided on the top of the dust collector, and a discharge port is provided at the bottom of the dust collector. The air inlet of the dust collector is connected to the air outlet of the adsorption tower through a pipeline.
[0054] It should be noted that the mixed gas treated by the adsorption tower enters the dust collector from the air inlet of the dust collector to remove the adsorbent that may be entrained in the mixed gas, and is finally discharged from the air outlet of the dust collector to the next container.
[0055] Among them, in this embodiment, two dust collectors are provided, but in actual application, there is no restriction on the number of dust collectors, and there is no restriction on the positions of the air inlet, air outlet and discharge port of the dust collector, as long as the above-mentioned technical effects can be achieved.
[0056] As a preferred embodiment, it also includes a control device for controlling the dust collector, the condenser, the adsorption tower, the drain valve and the hydrofluoric acid delivery pump 10.
[0057] It should be noted that, in one embodiment, the dust collector, condenser, adsorption tower, drain valve and hydrofluoric acid delivery pump 10 are controlled by a control device to realize automation of the mixed gas treatment process to reduce labor costs.
[0058] In the above cases, a one-way valve is provided on the pipeline, and the one-way valve is connected to the control device.
[0059] It can be understood that when the fluorine gas from the electrolytic cell needs to be utilized, the control device controls the one-way valve of the electrolytic cell to open so that the fluorine gas in the electrolytic cell is discharged to the production device 2, and at the same time controls the nitrogen entering the production device 2 in proportion to mix the fluorine-nitrogen mixed gas in a preset proportion. When the fluorine-nitrogen mixed gas in the production device 2 is mixed, the control device controls the one-way valve of the production device 2 to open so that the fluorine-nitrogen mixed gas enters the dust collector, condenser, adsorption tower and dust collector in sequence to obtain a fluorine-nitrogen mixed gas that does not contain HF.
[0060] In the above embodiment, the hydrofluoric acid collecting tank 8 is provided with a liquid level detector for detecting the liquid level, and the liquid level detector is connected to the control device.
[0061] It should be noted that when the liquid level detector detects that the liquid level in the hydrofluoric acid collection tank 8 has reached a preset height, it sends a signal to the control device, and the control device controls the drain valve of the hydrofluoric acid collection tank 8 and the hydrofluoric acid delivery pump 10 to open, and the hydrofluoric acid in the hydrofluoric acid collection tank 8 is delivered to the hydrofluoric acid recovery device 9, and the hydrofluoric acid is processed by the hydrofluoric acid recovery device 9.
[0062] In summary, in the fluorine-nitrogen mixed gas purification system provided by the utility model, the fluorine gas from the electrolytic cell is mixed with nitrogen in a certain proportion in the production device 2 to form a fluorine-nitrogen mixed gas, which is transported into the fluorine-nitrogen mixed gas purification system through a pipeline, first enters the primary dust removal device 1 to preliminarily remove the electrolyte particles entrained in the fluorine gas at the outlet of the electrolytic cell, and then enters the condensation device 3 to separate most of the HF entrained in the mixed gas by deep cooling and low-temperature liquefaction of liquid nitrogen, and then enters the adsorption device 5 to remove the residual trace HF in the mixed gas by adsorption, and finally enters the secondary dust removal device 6 to remove the adsorbent that may be entrained in the fluorine-nitrogen mixed gas, and finally obtains a fluorine-nitrogen mixed gas without HF to ensure the purity of the fluorine gas.
[0063] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.
[0064] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.
[0065] The above is a detailed introduction to a fluorine-nitrogen mixed gas purification system provided by the utility model. This article uses specific examples to illustrate the principle and implementation method of the utility model. The description of the above embodiment is only used to help understand the method and core idea of the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.
Claims
1. A fluorine-nitrogen mixed gas purification system, characterized in that: include: A primary dust removal device (1), wherein the input end of the primary dust removal device (1) is connected to the output end of a production device (2), the production device (2) is used to produce a fluorine-nitrogen mixed gas, and the input end of the production device (2) is connected to an electrolytic cell for electrolytically producing fluorine; A condensing device (3) connected to the output end of the primary dust removal device (1), and the condensing device (3) is also connected to the liquid nitrogen storage tank (4); An adsorption device (5), wherein an input end of the adsorption device (5) is connected to the condensation device (3), an output end of the adsorption device (5) is connected to a secondary dust removal device (6), and the secondary dust removal device (6) is connected to a gas storage tank (7).
2. The fluorine-nitrogen mixed gas purification system according to claim 1, characterized in that: The primary dust removal device (1) comprises at least two dust collectors, which are arranged in series via a pipeline, an air inlet is provided in the circumference of the dust collector, an air outlet is provided at the top of the dust collector, and a discharge port is provided at the bottom of the dust collector.
3. The fluorine-nitrogen mixed gas purification system according to claim 2, characterized in that: The condensing device (3) comprises at least two condensers, at least two of the condensers are arranged in series via the pipeline, the top of the condenser is provided with an air inlet connected to the dust collector, an air inlet connected to the liquid nitrogen storage tank (4), and an air outlet connected to the adsorption device (5), and the bottom of the condenser is provided with a discharge port and an exhaust port.
4. The fluorine-nitrogen mixed gas purification system according to claim 3, characterized in that: The discharge port is connected to a hydrofluoric acid collecting tank (8) via the pipeline, the liquid discharge port of the hydrofluoric acid collecting tank (8) is connected to a hydrofluoric acid recovery device (9) via the pipeline, the liquid discharge port is provided with a liquid discharge valve, and the pipeline is provided with a hydrofluoric acid delivery pump (10).
5. The fluorine-nitrogen mixed gas purification system according to claim 4, characterized in that: The adsorption device (5) comprises at least two adsorption towers, which are arranged in parallel via the pipeline, an air inlet is provided at the bottom of the adsorption tower, an air outlet is provided at the top of the adsorption tower, and the air inlet of the adsorption tower is connected to the condenser via the pipeline.
6. The fluorine-nitrogen mixed gas purification system according to claim 5, characterized in that: The secondary dust removal device (6) comprises at least two dust collectors, which are arranged in series via the pipeline, an air inlet is provided in the circumference of the dust collector, an air outlet is provided at the top of the dust collector, and a discharge port is provided at the bottom of the dust collector, and the air inlet of the dust collector is connected to the air outlet of the adsorption tower via the pipeline.
7. The fluorine-nitrogen mixed gas purification system according to claim 6, characterized in that: It also includes a control device for controlling the dust collector, the condenser, the adsorption tower, the drain valve and the hydrofluoric acid delivery pump (10).
8. The fluorine-nitrogen mixed gas purification system according to claim 7, characterized in that: The pipelines are all provided with one-way valves, and the one-way valves are connected to the control device.
9. The fluorine-nitrogen mixed gas purification system according to claim 8, characterized in that: The hydrofluoric acid collection tank (8) is provided with a liquid level detector for detecting the liquid level, and the liquid level detector is connected to the control device.