CN111085086A - NF prepared by electrolysis3System and method for recovering HF in tail gas of electrolysis system - Google Patents
NF prepared by electrolysis3System and method for recovering HF in tail gas of electrolysis system Download PDFInfo
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- CN111085086A CN111085086A CN201911418511.4A CN201911418511A CN111085086A CN 111085086 A CN111085086 A CN 111085086A CN 201911418511 A CN201911418511 A CN 201911418511A CN 111085086 A CN111085086 A CN 111085086A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1456—Removing acid components
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1493—Selection of liquid materials for use as absorbents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/18—Absorbing units; Liquid distributors therefor
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- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B7/00—Halogens; Halogen acids
- C01B7/19—Fluorine; Hydrogen fluoride
- C01B7/191—Hydrogen fluoride
- C01B7/195—Separation; Purification
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
- B01D2252/10—Inorganic absorbents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
- B01D2252/10—Inorganic absorbents
- B01D2252/103—Water
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D2257/204—Inorganic halogen compounds
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Abstract
The invention relates to an electrolytic preparation method of NF3A recovery system and a recovery method of HF in tail gas of an electrolysis system belong to the technical field of fine chemical engineering and environmental protection. The system comprises an absorption tower, an absorption tower liquid accumulation tank, a cooling tower liquid accumulation tank, a falling film absorber, a circulating acid tank and a circulating pump. Absorbing HF by using an absorbent in an absorption tower, then cooling the HF by low temperature, finally washing the HF by water and discharging the HF after reaching the standard, wherein byproducts can be recycled correspondingly, and further impurities can be removed by adopting the steps of pyrolysis, washing by water, alkali washing and the like; the system is convenient to operate, simple in raw materials, energy-saving and emission-reducing, and the product can be effectively reused.
Description
Technical Field
The invention relates to an electrolytic preparation method of NF3A recovery system and a recovery method of HF in tail gas of an electrolysis system belong to the technical field of fine chemical engineering and environmental protection.
Background
Electrolysis system NF3The raw material of the electrolysis process is prepared by one or more of ammonia gas, ammonium fluoride or ammonium bifluoride, ammonium fluoride, potassium fluoride and sodium fluoride and hydrogen fluoride according to a certain proportion, the electrolysis temperature is usually controlled at 70-150 ℃, the electrolysis temperature is higher, 10-30% of hydrogen fluoride in volume fraction can be carried in the electrolysis gas of a negative electrolysis system, and if the hydrogen fluoride gas in the electrolysis system is not treated, the emission standard can not be met. The existing disposal mode is generally one-stage or multi-stage absorption tower, and calcium hydroxide solution is used for spraying absorption. Although the method can meet the treatment requirement, the hydrogen fluoride is not effectively recycled, the economy is poor, and the obtained solid waste CaF2It cannot be disposed of.
The process currently employed, which also includes the 80% sulfuric acid solution extraction by HONEYWELL INTERNATIONAL CORPORATION, absorbs HF and the crude mixture product, containing HCFC-244bb and about 30 wt% HF, is injected into a sulfuric acid extraction column or phase separator to remove HF from the mixture. Dissolving HF in sulfuric acid to separate it from the organic phase mixture, heating and distilling the HF-containing sulfuric acid solution to desorb HF, heating and flashing at 140 deg.C in a TFE liner to a hydrogen fluoride content of 2.0 wt%, recovering HF containing 6000mg/kg and 500mg/kg sulfur-containing impurities, flashing again in a TFE liner to obtain hydrogen fluoride having a water content of less than 100mg/kg and less than 50mg/kg sulfur-containing impuritiesRecycled to the HCFC-244bb production. This approach is also not suitable for NF3The recovery treatment of a large amount of HF impurities in the electrolysis process, and the introduction of sulfuric acid impurities is not beneficial to NF3And (5) purifying the gas at the later stage.
There is also a proposal that showa electrical corporation adopts dilute hydrofluoric acid as an extracting agent to extract hydrogen fluoride in tail gas or electrolytic gas at the temperature of-35 ℃ to 35 ℃, but the final concentration of the hydrogen fluoride reaches 70%, and the content of the hydrogen fluoride in an organic phase is not disclosed, and the proposal is also published for recycling and applying. The empire chemical industry company adopts the extraction agent hydrofluoric acid and adds the potassium fluoride or the cesium fluoride, the extraction efficiency is higher, the minimum hydrogen fluoride in the organic phase can reach 19mg/kg, and the recycling and applying scheme is not published.
Other methods for direct recycling also comprise adding sewage hydrogen fluoride of potassium fluoride as an extracting agent, and distilling the hydrogen fluoride solution to recycle the hydrogen fluoride. Or using a perfluorosulfonic acid membrane to remove hydrogen fluoride.
Hydrogen fluoride aqueous solution has extremely strong corrosivity, can bring the threat for safety in production, and the hydrogen fluoride that contains in electrolysis gas or the tail gas can finally get into waste water and form low-quality waste acid water in addition, has both caused the loss of hydrogen fluoride for the cost improves, also does not benefit to the processing of follow-up waste water. If the hydrogen fluoride gas in the electrolytic gas or tail gas can be separated and enriched or made into derivatives for reuse by an effective method, the method has obvious economic and social benefits.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide an electrolytic preparation method of NF3System and method for recovering HF in tail gas of electrolysis system by using NH4HF2After absorbing HF, the HF is cooled at low temperature, and finally the HF is washed by water and discharged after reaching standards, and byproducts can be recycled.
In order to achieve the purpose of the invention, the following technical scheme is provided.
NF prepared by electrolysis3The system for recovering HF in tail gas of the electrolysis system comprises an absorption tower, an absorption tower liquid accumulation tank, a cooling tower liquid accumulation tank, a falling film absorber, a circulating acid tank and a circulating pump.
Wherein the absorbent in the absorption tower is ammonium bifluoride (NH)4HF2) At least one of ammonium fluoride, potassium fluoride and sodium fluoride.
The working pressure of the cooling tower is normal pressure, and the working temperature is-80 ℃ to-90 ℃.
Electrolytic preparation of NF3The tail gas of the electrolysis system is connected with the inlet at the bottom of the absorption tower through a pipeline; the outlet at the top of the absorption tower is connected with the inlet at the bottom of the cooling tower through a pipeline, and the outlet at the bottom of the absorption tower is connected with the inlet of the liquid accumulation tank of the absorption tower through a pipeline; an outlet at the top of the cooling tower is connected with an inlet at the bottom of the falling film absorber through a pipeline, and an outlet at the bottom of the cooling tower is connected with an inlet of a liquid accumulation tank of the cooling tower through a pipeline; the outlet at the bottom of the falling film absorber is connected with the inlet of a circulating acid tank through a pipeline, the outlet of the circulating acid tank is connected with the inlet of a circulating pump through a pipeline, and the outlet of the circulating pump is connected with the inlet at the top of the falling film absorber through a pipeline.
Preferably, a high-temperature cracking tank is connected to the pipeline before the inlet of the absorption tower or after the outlet of the cooling tower;
preferably, the gas discharged from the outlet at the top of the falling film absorber is connected with a caustic washing tower through a pipeline for carrying out caustic washing impurity removal.
NF prepared by electrolysis3The method for recovering HF in tail gas of an electrolysis system adopts the method for preparing NF by electrolysis3A recovery system for HF in tail gas of an electrolysis system comprises the following steps:
(1) tail gas of the electrolysis system enters an absorption tower through a pipeline, liquid formed after absorption of an absorbent in the absorption tower flows into a liquid accumulation tank of the absorption tower from the tower bottom of the absorption tower, and the liquid in the liquid accumulation tank can be recycled to production as a byproduct or a raw material; the other part is not absorbed.
(2) The unabsorbed tail gas of the electrolysis system continuously passes through the cooling tower, one part of the tail gas cools HF in the tail gas into liquid state through cooling, and the liquid flowing into the liquid accumulation tank of the cooling tower from the tower bottom can be reused as a byproduct or raw material in the production; the other part is not absorbed;
(3) the unabsorbed tail gas of the electrolysis system continuously passes through the falling film absorber, is absorbed by water to form hydrofluoric acid, enters the circulating acid tank from the bottom of the falling film absorber, and then flows into the falling film absorber through the circulating pump to form circulation until the hydrofluoric acid in the hydrofluoric acid aqueous solution in the circulating acid tank reaches the concentration for reutilization, and then is taken out for reutilization; and the gas after water absorption is discharged from the top of the falling film absorber.
And (4) in the step (3), the mass concentration of hydrofluoric acid in the hydrofluoric acid aqueous solution in the circulating acid tank reaches more than 50%, and the hydrofluoric acid can be sold as a byproduct or used as a raw material for preparing products such as ammonium bifluoride, potassium fluoride, sodium fluoride, ammonium fluoride and the like.
Preferably, the high-temperature cracking treatment is performed before the step (1) or after the step (2), the high-temperature cracking is directly performed under the action of high-temperature electric arc, the high-temperature electric arc takes fluorine gas as a plasma arc initiating medium, and the cracking temperature is 300-700 ℃.
Further preferably, the gas absorbed by the falling film absorber is cooled and washed by alkali, and the gas after alkali washing is discharged at high altitude.
Advantageous effects
The invention provides a method for preparing NF by electrolysis3A recovery system and a method for HF in tail gas of an electrolysis system, which are used for preparing NF from electrolysis3The mature system and the recovery method for recovering HF from the tail gas of the electrolysis system utilize the absorbent to absorb HF, then carry out low-temperature cooling, finally carry out water washing and discharge after reaching standards, and can correspondingly recycle by-products and further remove impurities by adopting the steps of pyrolysis, water washing, alkali washing and the like; the system is convenient to operate, simple in raw materials, energy-saving and emission-reducing, and the product can be effectively reused.
Drawings
FIG. 1 shows the preparation of NF by electrolysis in example 13Schematic diagram of a recovery system for HF in tail gas of an electrolysis system.
FIG. 2 shows the preparation of NF by electrolysis in example 23Schematic diagram of HF recovery system in tail gas of electrolysis system
Wherein, the process comprises 1-absorption tower, 2-absorption tower liquid accumulation tank, 3-cooling tower, 4-cooling tower liquid accumulation tank, 5-falling film absorber, 6-circulating acid tank, 7-circulating pump, 8-pyrolysis tank, and 9-alkaline washing tower
Detailed Description
The invention is described in detail below with reference to the drawings and specific examples, but the invention is not limited thereto.
Example 1
NF prepared by electrolysis3A recovery system of HF in tail gas of an electrolysis system comprises an absorption tower 1, an absorption tower liquid accumulation tank 2, a cooling tower 3, a cooling tower liquid accumulation tank 4, a falling film absorber 5, a circulating acid tank 6 and a circulating pump 7, and is shown in figure 1.
Wherein, the absorbent in the absorption tower 1 is at least one of ammonium bifluoride, ammonium fluoride, potassium fluoride and sodium fluoride.
The working pressure of the cooling tower 3 is normal pressure, and the working temperature is-80 ℃ to-90 ℃.
The tail gas of the electrolysis system is connected with the inlet at the bottom of the absorption tower 1 through a pipeline; the outlet at the top of the absorption tower 1 is connected with the inlet at the bottom of the cooling tower 3 through a pipeline, and the outlet at the bottom of the absorption tower 1 is connected with the inlet of the absorption tower liquid accumulation tank 2 through a pipeline; an outlet at the top of the cooling tower 3 is connected with an inlet at the bottom of the falling film absorber 5 through a pipeline, and an outlet at the bottom of the cooling tower 3 is connected with an inlet of the liquid accumulation tank 4 of the cooling tower through a pipeline; an outlet at the bottom of the falling film absorber 5 is connected with an inlet of a circulating acid tank 6 through a pipeline, an outlet of the circulating acid tank 6 is connected with an inlet of a circulating pump 7 through a pipeline, and an outlet of the circulating pump 7 is connected with an inlet at the top of the falling film absorber 5 through a pipeline.
NF prepared by electrolysis3The method for recovering HF in the tail gas of the electrolysis system adopts the method for preparing NF by electrolysis3A recovery system for HF in tail gas of an electrolysis system comprises the following steps:
(1) the tail gas of the electrolysis system enters the absorption tower 1 through a pipeline, part of the liquid formed after the absorption of the absorbent in the absorption tower 1 flows into the absorption tower liquid accumulation tank 2 from the bottom of the absorption tower 1, and can be recycled to the production as a byproduct or raw material, and the other part of the liquid is not absorbed.
(2) The unabsorbed tail gas of the electrolysis system continues to pass through the cooling tower 3, one part of the tail gas cools HF in the tail gas into liquid by cooling, the liquid flowing into the liquid accumulating tank 4 of the cooling tower from the bottom of the tower can be recycled to production as a byproduct or raw material, and the other part of the tail gas is not absorbed;
(3) unabsorbed tail gas of the electrolysis system continuously passes through the falling film absorber, is absorbed by water to form hydrofluoric acid, enters the circulating acid tank 6 from the bottom of the falling film absorber 5, then flows into the falling film absorber 5 through the circulating pump 7 to form circulation, and the circulating flow in the circulating acid tank 6 is 5m3/h～30m3The hydrofluoric acid in the hydrofluoric acid aqueous solution in the circulating acid tank 6 is taken out for recycling until the concentration of the hydrofluoric acid in the hydrofluoric acid aqueous solution reaches the recycling concentration; the absorbed gas is discharged from the top outlet of the falling film absorber 5 to the air.
In the step (3), the hydrofluoric acid in the hydrofluoric acid aqueous solution in the circulating acid tank 6 reaches a mass concentration of 50%, and the generated hydrofluoric acid can be sold as a byproduct or used as a raw material for preparing products such as ammonium bifluoride, potassium fluoride, sodium fluoride, ammonium fluoride and the like.
The tail gas treated by the method can reach the standard and be directly discharged into the air, and the national relevant environmental protection standard is met.
Example 2
NF prepared by electrolysis3A recovery system of HF in tail gas of an electrolysis system comprises an absorption tower 1, an absorption tower liquid accumulation tank 2, a cooling tower 3, a cooling tower liquid accumulation tank 4, a falling film absorber 5, a circulating acid tank 6, a circulating pump 7, a high-temperature cracking tank 8 and an alkaline washing tower 9, and is shown in figure 2.
Wherein, the absorbent in the absorption tower 1 is at least one of ammonium bifluoride, ammonium fluoride, potassium fluoride and sodium fluoride.
The working pressure of the cooling tower 3 is normal pressure, and the working temperature is-80 ℃ to-90 ℃.
The tail gas of the electrolysis system is connected with a bottom inlet of the high-temperature cracking tank 8 through a pipeline, and an ejection outlet of the high-temperature cracking tank 8 is connected with a bottom inlet of the absorption tower 1 through a pipeline; the outlet at the top of the absorption tower 1 is connected with the inlet at the bottom of the cooling tower 3 through a pipeline, and the outlet at the bottom of the absorption tower 1 is connected with the inlet of the absorption tower liquid accumulation tank 2 through a pipeline; an outlet at the top of the cooling tower 3 is connected with an inlet at the bottom of the falling film absorber 5 through a pipeline, and an outlet at the bottom of the cooling tower 3 is connected with an inlet of the liquid accumulation tank 4 of the cooling tower through a pipeline; an outlet at the bottom of the falling film absorber 5 is connected with an inlet of a circulating acid tank 6 through a pipeline, an outlet of the circulating acid tank 6 is connected with an inlet of a circulating pump 7 through a pipeline, and the circulating pump 7 is connected with an inlet at the top of the falling film absorber 5 through a pipeline; an outlet at the top of the falling film absorber 5 is connected with an inlet of an alkaline washing tower 9 through a pipeline, and an outlet of the alkaline washing tower 9 is directly connected with the atmosphere.
NF prepared by electrolysis3The method for recovering HF in the tail gas of the electrolysis system adopts the method for preparing NF by electrolysis3A recovery system for HF in tail gas of an electrolysis system comprises the following steps:
(1) and (3) leading the tail gas of the electrolysis system to enter a high-temperature cracking tank through a pipeline, controlling the cracking temperature to be 300-700 ℃, and cracking the tail gas of the electrolysis system.
(2) The cracked tail gas enters the absorption tower 1 through a pipeline, part of the tail gas is absorbed by the absorbent in the absorption tower 1 to form liquid, the liquid flows into the absorption tower liquid accumulation tank 2 from the bottom of the absorption tower 1, and the liquid can be used as a byproduct or raw material to be recycled in production, and the other part of the tail gas is not absorbed.
(3) The unabsorbed tail gas of the electrolysis system continues to pass through the cooling tower 3, one part of the tail gas cools HF in the tail gas into liquid by cooling, the liquid flowing into the liquid accumulating tank 4 of the cooling tower from the bottom of the tower can be recycled to production as a byproduct or raw material, and the other part of the tail gas is not absorbed;
(4) unabsorbed tail gas of the electrolysis system continuously passes through the falling film absorber 5, is absorbed by water to form hydrofluoric acid, enters the circulating acid tank 6 from the bottom of the falling film absorber 5, then flows into the falling film absorber 5 through the circulating pump 7 to form circulation, and the circulating flow in the circulating acid tank 6 is 5m3/h～30m3The hydrofluoric acid in the hydrofluoric acid aqueous solution in the circulating acid tank 6 is taken out for recycling until the concentration of the hydrofluoric acid reaches the recycling concentration; the other part is not absorbed;
(5) unabsorbed gas continues to pass through the caustic tower 9, impurities which are not easy to react with water are removed through caustic washing, and the unabsorbed gas is directly discharged in high altitude after absorption is completed.
In the step (4), the hydrofluoric acid in the hydrofluoric acid aqueous solution in the circulating acid tank 6 reaches a mass concentration of 50%, and the generated hydrofluoric acid can be sold as a byproduct or used as a raw material for preparing products such as ammonium bifluoride, potassium fluoride, sodium fluoride, ammonium fluoride and the like.
The tail gas treated by the method can reach the standard emission and meet the national relevant environmental protection standard.
The two embodiments show that the system and the method can realize convenient system operation, simple raw materials, energy conservation and emission reduction, and the product can be effectively reused.
The technical solutions provided by the embodiments of the present invention are described in detail above, and the principles and embodiments of the present invention are explained herein by using specific examples, and the descriptions of the embodiments are only used to help understanding the principles of the embodiments of the present invention; meanwhile, the detailed description and the application scope of the embodiments according to the present invention may be changed by those skilled in the art, and in summary, the present disclosure should not be construed as limiting the present invention.
Claims (9)
1. NF prepared by electrolysis3HF's recovery system in electrolysis system tail gas, its characterized in that: the system comprises an absorption tower (1), an absorption tower liquid accumulation tank (2), a cooling tower (3), a cooling tower liquid accumulation tank (4), a falling film absorber (5), a circulating acid tank (6) and a circulating pump (7);
the absorbent in the absorption tower (1) is at least one of ammonium bifluoride, ammonium fluoride, potassium fluoride and sodium fluoride;
the working pressure of the cooling tower (3) is normal pressure, and the working temperature is-80 ℃ to-90 ℃;
electrolytic preparation of NF3Tail gas of the electrolysis system is connected with an inlet at the bottom of the absorption tower (1) through a pipeline; an outlet at the top of the absorption tower (1) is connected with an inlet at the bottom of the cooling tower (3) through a pipeline, and an outlet at the bottom of the absorption tower (1) is connected with an inlet of the absorption tower liquid accumulation tank (2) through a pipeline; an outlet at the top of the cooling tower (3) is connected with an inlet at the bottom of the falling film absorber (5) through a pipeline, and an outlet at the bottom of the cooling tower (3) is connected with an inlet of a liquid accumulation tank (4) of the cooling tower through a pipeline; an outlet at the bottom of the falling film absorber (5) is connected with an inlet of a circulating acid tank (6) through a pipeline, an outlet of the circulating acid tank (6) is connected with an inlet of a circulating pump (7) through a pipeline, and an outlet of the circulating pump (7) is connected with an inlet at the top of the falling film absorber through a pipeline.
2. An electrolytic process NF according to claim 13HF's recovery system in electrolysis system tail gas, its characterized in that: the system also comprises a high-temperature cracking tank (8) which is positioned on a pipeline in front of the tower inlet of the absorption tower (1) or behind the outlet of the cooling tower (3).
3. An electrolytic process NF according to claim 13HF's recovery system in electrolysis system tail gas, its characterized in that: the system also comprises a caustic washing tower (9) which is positioned on a pipeline for discharging gas at the top outlet of the falling film absorber (5).
4. An electrolytic process for NF as claimed in claim 13HF's recovery system in electrolysis system tail gas, its characterized in that: the system also comprises a high-temperature cracking tank (8) which is positioned on a pipeline in front of the tower inlet of the absorption tower (1) or behind the outlet of the cooling tower (3); the system also comprises a caustic washing tower (9) which is positioned on a pipeline for discharging gas at the top outlet of the falling film absorber (5).
5. NF prepared by electrolysis3The method for recovering HF in the tail gas of the electrolysis system is characterized by comprising the following steps: the method adopts the electrolysis preparation NF as defined in any one of claims 1-43A recovery system for HF in tail gas of an electrolysis system comprises the following steps:
(1) tail gas of the electrolysis system enters an absorption tower (1) through a pipeline, liquid formed after absorption of an absorbent in the absorption tower (1) flows into an absorption tower liquid accumulation tank (2) from the bottom of the absorption tower (1), and the other part of the liquid is not absorbed;
(2) the unabsorbed tail gas of the electrolysis system continuously passes through the cooling tower (3), one part of the tail gas cools HF in the tail gas into liquid state through cooling, and the liquid state flows into a cooling tower liquid accumulation tank (4) from the bottom of the tower, and the other part of the tail gas is unabsorbed;
(3) the unabsorbed tail gas of the electrolysis system continuously passes through the falling film absorber (5), is absorbed by water to form hydrofluoric acid, enters the circulating acid tank (6) from the bottom of the falling film absorber (5), and then flows into the falling film absorber (5) through the circulating pump (7) to form circulation until the hydrofluoric acid in the hydrofluoric acid aqueous solution in the circulating acid tank (6) reaches the concentration of reuse, and then is taken out for reuse; the gas after water absorption is discharged from the top of the falling film absorber (5).
6. An electrolytic process NF according to claim 53The method for recovering HF in the tail gas of the electrolysis system is characterized by comprising the following steps: before or after the step (1) or (2), performing high-temperature cracking treatment, wherein the high-temperature cracking is directly cracked under the action of high-temperature electric arc, fluorine gas is used as a plasma arc initiating medium, and the cracking temperature is 300-700 ℃.
7. An electrolytic process NF according to claim 53The method for recovering HF in the tail gas of the electrolysis system is characterized by comprising the following steps: and (3) cooling and alkali washing the gas absorbed by the falling film absorber (5), and discharging the gas subjected to alkali washing in high altitude.
8. An electrolytic process NF according to claim 53The method for recovering HF in the tail gas of the electrolysis system is characterized by comprising the following steps: before or after the step (1) or the step (2), carrying out high-temperature cracking treatment, wherein the high-temperature cracking is directly cracked under the action of high-temperature electric arc, fluorine gas is used as a plasma arc initiating medium, and the cracking temperature is 300-700 ℃;
and (3) cooling and alkali washing the gas absorbed by the falling film absorber (5), and discharging the gas subjected to alkali washing in high altitude.
9. An electrolytic process NF according to claim 53The method for recovering HF in the tail gas of the electrolysis system is characterized by comprising the following steps: the hydrofluoric acid in the hydrofluoric acid aqueous solution in the circulating acid tank (6) reaches the mass concentration of more than 50 percent and is sold as a byproduct or used as a raw material for preparing ammonium bifluoride, potassium fluoride, sodium fluoride and ammonium fluoride.
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| CN112191081A (en) * | 2020-09-01 | 2021-01-08 | 中船重工（邯郸）派瑞特种气体有限公司 | Method and system for treating hydrogen fluoride tail gas generated in nitrogen trifluoride preparation process |
| CN113842753A (en) * | 2021-11-08 | 2021-12-28 | 中船重工（邯郸）派瑞特种气体有限公司 | Treatment process of tail gas discharged from cathode of nitrogen trifluoride electrolytic cell |
| CN114524421A (en) * | 2022-03-08 | 2022-05-24 | 中船(邯郸)派瑞特种气体股份有限公司 | Method for recovering nitrogen trifluoride from cold trap blow-down gas and preparing hydrofluoric acid |
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