CN109795994A - A kind of technique that dust technology adds dehydrating agent to produce concentrated nitric acid - Google Patents
A kind of technique that dust technology adds dehydrating agent to produce concentrated nitric acid Download PDFInfo
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- CN109795994A CN109795994A CN201910224058.7A CN201910224058A CN109795994A CN 109795994 A CN109795994 A CN 109795994A CN 201910224058 A CN201910224058 A CN 201910224058A CN 109795994 A CN109795994 A CN 109795994A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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Abstract
The invention discloses the techniques that a kind of dust technology adds dehydrating agent to produce concentrated nitric acid, include the following steps: S1: carrying out the preparation of nitric acid magnesium liquid first, S2: the preparation of dust technology is carried out, S3: the dust technology come from step S2 is sent to dust technology head tank, enter mixer by dust technology flowmeter, S4: on the basis of step S3, the nitric acid vapor of content 80%~90% is carried into section by concentration tower, S5: the evaporation of magnesium nitrate is carried out, S6: the steam containing nitre that step S5 is evaporated enters acid separator, the technique is prepared using nitre magnesium liquid, dust technology concentration, concentrated nitric acid bleaching and magnesium nitrate evaporate four processes, wherein simple process, energy consumption is told somebody what one's real intentions are, it invests less, it is stable, securely and reliably.
Description
Technical field
The present invention relates to concentrated nitric acid preparation technical fields more particularly to a kind of dust technology, and dehydrating agent to be added to produce the work of concentrated nitric acid
Skill.
Background technique
Nitric acid be it is a kind of there is strong oxidizing property, corrosive strong acid, belong to unitary inorganic strong acid, be six big inorganic acids it
One, and a kind of important industrial chemicals.It industrially can be used for inhibition and generation fertilizer, pesticide, explosive, dyestuff, salt etc.；It is organising
In, the mixed liquor of concentrated nitric acid and the concentrated sulfuric acid is important nitrating agent, and aqueous solution is commonly called as nitric acid or ammonia nitrogen water.In the modern times
In industry, the preparation of nitric acid is particularly important, but traditional preparation process is complicated, and fluctuation of service prepares
Nitric acid it is often undesirable.
Summary of the invention
The invention proposes a kind of dust technologies, and dehydrating agent to be added to produce the technique of concentrated nitric acid, to solve to mention in above-mentioned background technique
Out the problem of.
The invention proposes a kind of dust technologies, and dehydrating agent to be added to produce the technique of concentrated nitric acid, includes the following steps:
S1: carrying out the preparation of nitric acid magnesium liquid first, and desalted water is added changing in magnesium slot, is heated to 60~90 with low-pressure steam
DEG C, then solid nitric acid magnesium is slowly added in slot again, while being stirred with compressed air, nitric acid magnesium density reaches 40%~
It is sent after 50% to magnesium nitrate evaporization process；
S2: carrying out the preparation of dust technology, manufactures dust technology using ammonia oxidation, the gaseous mixture of ammonia and air is passed through scorching hot
Platinum-rhodium alloy net, under the catalysis of alloy network, ammonia is oxidized to nitric oxide, and the nitric oxide of generation is using remaining after reaction
Oxygen continue to be oxidized to nitrogen dioxide, then nitrogen dioxide is passed through in water and produces nitric acid, the concentration of nitric acid produced be 65%
~68%；
S3: the dust technology come from step S2 is sent to dust technology head tank, enters mixer, dense nitre by dust technology flowmeter
Sour magnesium solution is pumped into concentrated nitric acid magnesium head tank by concentrated nitric acid magnesium, by concentrated nitric acid magnesium flow ratio regulating valve enter mixer with
Nitric acid mixing, nitric acid and concentrated nitric acid magnesium mixed liquor enter in the middle part of concentration tower, concentrated nitric acid magnesium solution absorb in dust technology after moisture at
Magnesium nitrate heater is flowed into from tower bottom for dust technology beautifying liquid, flows into dust technology magnesium slot after heating is out of stock；
S4: on the basis of step S3, carrying section by concentration tower for the nitric acid vapor of content 80%~90%, purifies and is
98.0% or more nitric acid vapor is condensed into concentrated nitric acid into nitric acid condenser, is allocated acid seal using vapour liquid separator,
About 2/3 concentrated nitric acid returns concentration tower by reflux acid seal, and about 1/3 concentrated nitric acid removes concentrated nitric acid bleaching process, from gas-liquid point
It is recycled from the tail gas that device comes out by tower exhaust ejector, acid water enters the recycling of tower tail water circulating slot, by following
Ring, tower tail water concentration of nitric acid are sent to the recycling of dust technology device after reaching 15%~20%；
S5: carrying out the evaporation of magnesium nitrate, and the dust technology magnesium solution in dust technology magnesium storage tank is pumped into nitric acid through dust technology magnesium
Magnesium evaporator is evaporated in vacuo concentrate in evaporator, evaporates endpoint concentration 76%~78%, and gained concentrated nitric acid magnesium solution flows into dense
Magnesium nitrate storage tank is used through concentrated nitric acid magnesium pump circulation；
S6: the steam containing nitre that step S5 is evaporated enters acid separator, isolates most nitre contained in steam
Acid is sent to tower tail water slot, and steam enters indirect cooler, and magnesium tail water circulating slot is entered after condensation, and acid content can drop in magnesium tail water
As low as 0.1% hereinafter, incoagulable gas is extracted out through magnesium tail injector, the vacuum degree of system is kept, magnesium tail water is carried out with circulating pump
It is recycled, is sent to dust technology device as needed as water is absorbed, remaining can supplement recirculated water use.
Preferred: the group of gaseous mixture becomes oxygen and nitrogen, and the volume ratio 2:1 of oxygen and nitrogen in step S2, and wherein platinum rhodium closes
The temperature of gold net is 760~840 DEG C.
Preferred: the nitric acid in step S3 in mixer is made of concentrated nitric acid and dust technology, and the wherein ratio of concentrated nitric acid
It is 2~3 parts, dust technology is 1 part, and the secondary steam generated in magnesium nitrate heater enters concentration tower bottom, is grasped as distillation
The heat source of work.
Preferred: steps are as follows for the concentrated nitric acid bleaching process in step S4:
A1: the concentrated nitric acid come from concentrated nitric acid enrichment process enters at the top of bleaching tower through bleaching acid seal, enters with tower lower part
Air carries out mass transport process in tower packing superinverse stream, and a small amount of nitrogen oxides dissolved in concentrated nitric acid gets into the air；
A2: it is recycled with the bleaching injector that air enters on tower tail water circulating slot, qualified concentrated nitric acid is sent to finished product
Concentrated nitric acid tank, bleaching air is warming up to 50 degrees Celsius into first passing around air preheater before tower, to improve bleaching effect, bleaching
Injector maintains the operation of bleaching system tiny structure.
Preferred: the vacuum degree in the vacuum evaporation concentrate of step S5 is 60-65KPa.
A kind of dust technology proposed by the present invention adds dehydrating agent to produce the technique of concentrated nitric acid, and beneficial effect is: the technique is adopted
With nitre magnesium liquid preparation, dust technology concentration, concentrated nitric acid bleaching and magnesium nitrate evaporate four processes, wherein simple process, energy consumption tell somebody what one's real intentions are,
It invests less, stable, safe and reliable.
Specific embodiment
It is next combined with specific embodiments below that the present invention will be further described.
Embodiment 1
The invention proposes a kind of dust technologies, and dehydrating agent to be added to produce the technique of concentrated nitric acid, includes the following steps:
S1: carrying out the preparation of nitric acid magnesium liquid first, and desalted water is added changing in magnesium slot, is heated to 60 DEG C with low-pressure steam,
Then solid nitric acid magnesium is slowly added in slot again, while is stirred with compressed air, nitric acid magnesium density is sent after reaching 40%
To magnesium nitrate evaporization process；
S2: carrying out the preparation of dust technology, manufactures dust technology using ammonia oxidation, the gaseous mixture of ammonia and air is passed through scorching hot
Platinum-rhodium alloy net, under the catalysis of alloy network, ammonia is oxidized to nitric oxide, and the nitric oxide of generation is using remaining after reaction
Oxygen continue to be oxidized to nitrogen dioxide, then nitrogen dioxide is passed through in water and produces nitric acid, the concentration of nitric acid produced be 65%；
S3: the dust technology come from step S2 is sent to dust technology head tank, enters mixer, dense nitre by dust technology flowmeter
Sour magnesium solution is pumped into concentrated nitric acid magnesium head tank by concentrated nitric acid magnesium, by concentrated nitric acid magnesium flow ratio regulating valve enter mixer with
Nitric acid mixing, nitric acid and concentrated nitric acid magnesium mixed liquor enter in the middle part of concentration tower, concentrated nitric acid magnesium solution absorb in dust technology after moisture at
Magnesium nitrate heater is flowed into from tower bottom for dust technology beautifying liquid, flows into dust technology magnesium slot after heating is out of stock；
S4: on the basis of step S3, carrying section by concentration tower for the nitric acid vapor of content 80%, purify for 98.0% with
On nitric acid vapor, be condensed into concentrated nitric acid into nitric acid condenser, be allocated acid seal using vapour liquid separator, about 2/3
Concentrated nitric acid returns concentration tower by reflux acid seal, and about 1/3 concentrated nitric acid removes concentrated nitric acid bleaching process, comes out from gas-liquid separator
Tail gas recycled by tower exhaust ejector, acid water enters the recycling of tower tail water circulating slot, by circulation, tower tail water
Concentration of nitric acid is sent to the recycling of dust technology device after reaching 15%；
S5: carrying out the evaporation of magnesium nitrate, and the dust technology magnesium solution in dust technology magnesium storage tank is pumped into nitric acid through dust technology magnesium
Magnesium evaporator is evaporated in vacuo concentrate in evaporator, evaporates endpoint concentration 76%, and gained concentrated nitric acid magnesium solution flows into concentrated nitric acid magnesium
Storage tank is used through concentrated nitric acid magnesium pump circulation；
S6: the steam containing nitre that step S5 is evaporated enters acid separator, isolates most nitre contained in steam
Acid is sent to tower tail water slot, and steam enters indirect cooler, and magnesium tail water circulating slot is entered after condensation, and acid content can drop in magnesium tail water
As low as 0.1% hereinafter, incoagulable gas is extracted out through magnesium tail injector, the vacuum degree of system is kept, magnesium tail water is carried out with circulating pump
It is recycled, is sent to dust technology device as needed as water is absorbed, remaining can supplement recirculated water use.
The group of gaseous mixture becomes oxygen and nitrogen, and the volume ratio 2:1 of oxygen and nitrogen, and the wherein temperature of platinum-rhodium alloy net in step S2
Degree is 760 DEG C.
Nitric acid in step S3 in mixer is made of concentrated nitric acid and dust technology, and wherein the ratio of concentrated nitric acid is 2~3
Part, dust technology is 1 part, and the secondary steam generated in magnesium nitrate heater enters concentration tower bottom, the heat as distillation procedure
Source.
Steps are as follows for concentrated nitric acid bleaching process in step S4:
A1: the concentrated nitric acid come from concentrated nitric acid enrichment process enters at the top of bleaching tower through bleaching acid seal, enters with tower lower part
Air carries out mass transport process in tower packing superinverse stream, and a small amount of nitrogen oxides dissolved in concentrated nitric acid gets into the air；
A2: it is recycled with the bleaching injector that air enters on tower tail water circulating slot, qualified concentrated nitric acid is sent to finished product
Concentrated nitric acid tank, bleaching air is warming up to 50 degrees Celsius into first passing around air preheater before tower, to improve bleaching effect, bleaching
Injector maintains the operation of bleaching system tiny structure.
Vacuum degree in the vacuum evaporation concentrate of step S5 is 60KPa.
Embodiment 2
The invention proposes a kind of dust technologies, and dehydrating agent to be added to produce the technique of concentrated nitric acid, includes the following steps:
S1: carrying out the preparation of nitric acid magnesium liquid first, and desalted water is added changing in magnesium slot, is heated to 90 DEG C with low-pressure steam,
Then solid nitric acid magnesium is slowly added in slot again, while is stirred with compressed air, nitric acid magnesium density is sent after reaching 50%
To magnesium nitrate evaporization process；
S2: carrying out the preparation of dust technology, manufactures dust technology using ammonia oxidation, the gaseous mixture of ammonia and air is passed through scorching hot
Platinum-rhodium alloy net, under the catalysis of alloy network, ammonia is oxidized to nitric oxide, and the nitric oxide of generation is using remaining after reaction
Oxygen continue to be oxidized to nitrogen dioxide, then nitrogen dioxide is passed through in water and produces nitric acid, the concentration of nitric acid produced be 68%；
S3: the dust technology come from step S2 is sent to dust technology head tank, enters mixer, dense nitre by dust technology flowmeter
Sour magnesium solution is pumped into concentrated nitric acid magnesium head tank by concentrated nitric acid magnesium, by concentrated nitric acid magnesium flow ratio regulating valve enter mixer with
Nitric acid mixing, nitric acid and concentrated nitric acid magnesium mixed liquor enter in the middle part of concentration tower, concentrated nitric acid magnesium solution absorb in dust technology after moisture at
Magnesium nitrate heater is flowed into from tower bottom for dust technology beautifying liquid, flows into dust technology magnesium slot after heating is out of stock；
S4: on the basis of step S3, carrying section by concentration tower for the nitric acid vapor of content 90%, purify for 98.0% with
On nitric acid vapor, be condensed into concentrated nitric acid into nitric acid condenser, be allocated acid seal using vapour liquid separator, about 2/3
Concentrated nitric acid returns concentration tower by reflux acid seal, and about 1/3 concentrated nitric acid removes concentrated nitric acid bleaching process, comes out from gas-liquid separator
Tail gas recycled by tower exhaust ejector, acid water enters the recycling of tower tail water circulating slot, by circulation, tower tail water
Concentration of nitric acid is sent to the recycling of dust technology device after reaching 20%；
S5: carrying out the evaporation of magnesium nitrate, and the dust technology magnesium solution in dust technology magnesium storage tank is pumped into nitric acid through dust technology magnesium
Magnesium evaporator is evaporated in vacuo concentrate in evaporator, evaporates endpoint concentration 78%, and gained concentrated nitric acid magnesium solution flows into concentrated nitric acid magnesium
Storage tank is used through concentrated nitric acid magnesium pump circulation；
S6: the steam containing nitre that step S5 is evaporated enters acid separator, isolates most nitre contained in steam
Acid is sent to tower tail water slot, and steam enters indirect cooler, and magnesium tail water circulating slot is entered after condensation, and acid content can drop in magnesium tail water
As low as 0.1% hereinafter, incoagulable gas is extracted out through magnesium tail injector, the vacuum degree of system is kept, magnesium tail water is carried out with circulating pump
It is recycled, is sent to dust technology device as needed as water is absorbed, remaining can supplement recirculated water use.
The group of gaseous mixture becomes oxygen and nitrogen, and the volume ratio 2:1 of oxygen and nitrogen, and the wherein temperature of platinum-rhodium alloy net in step S2
Degree is 840 DEG C.
Nitric acid in step S3 in mixer is made of concentrated nitric acid and dust technology, and wherein the ratio of concentrated nitric acid is 2~3
Part, dust technology is 1 part, and the secondary steam generated in magnesium nitrate heater enters concentration tower bottom, the heat as distillation procedure
Source.
4, the technique that a kind of dust technology according to claim 1 adds dehydrating agent to produce concentrated nitric acid, it is characterised in that: step
Steps are as follows for concentrated nitric acid bleaching process in rapid S4:
A1: the concentrated nitric acid come from concentrated nitric acid enrichment process enters at the top of bleaching tower through bleaching acid seal, enters with tower lower part
Air carries out mass transport process in tower packing superinverse stream, and a small amount of nitrogen oxides dissolved in concentrated nitric acid gets into the air；
A2: it is recycled with the bleaching injector that air enters on tower tail water circulating slot, qualified concentrated nitric acid is sent to finished product
Concentrated nitric acid tank, bleaching air is warming up to 50 degrees Celsius into first passing around air preheater before tower, to improve bleaching effect, bleaching
Injector maintains the operation of bleaching system tiny structure.
Vacuum degree in the vacuum evaporation concentrate of step S5 is 65KPa.
Embodiment 3
The invention proposes a kind of dust technologies, and dehydrating agent to be added to produce the technique of concentrated nitric acid, includes the following steps:
S1: carrying out the preparation of nitric acid magnesium liquid first, and desalted water is added changing in magnesium slot, is heated to 70 DEG C with low-pressure steam,
Then solid nitric acid magnesium is slowly added in slot again, while is stirred with compressed air, nitric acid magnesium density is sent after reaching 45%
To magnesium nitrate evaporization process；
S2: carrying out the preparation of dust technology, manufactures dust technology using ammonia oxidation, the gaseous mixture of ammonia and air is passed through scorching hot
Platinum-rhodium alloy net, under the catalysis of alloy network, ammonia is oxidized to nitric oxide, and the nitric oxide of generation is using remaining after reaction
Oxygen continue to be oxidized to nitrogen dioxide, then nitrogen dioxide is passed through in water and produces nitric acid, the concentration of nitric acid produced be 67%；
S3: the dust technology come from step S2 is sent to dust technology head tank, enters mixer, dense nitre by dust technology flowmeter
Sour magnesium solution is pumped into concentrated nitric acid magnesium head tank by concentrated nitric acid magnesium, by concentrated nitric acid magnesium flow ratio regulating valve enter mixer with
Nitric acid mixing, nitric acid and concentrated nitric acid magnesium mixed liquor enter in the middle part of concentration tower, concentrated nitric acid magnesium solution absorb in dust technology after moisture at
Magnesium nitrate heater is flowed into from tower bottom for dust technology beautifying liquid, flows into dust technology magnesium slot after heating is out of stock；
S4: on the basis of step S3, carrying section by concentration tower for the nitric acid vapor of content 85%, purify for 98.0% with
On nitric acid vapor, be condensed into concentrated nitric acid into nitric acid condenser, be allocated acid seal using vapour liquid separator, about 2/3
Concentrated nitric acid returns concentration tower by reflux acid seal, and about 1/3 concentrated nitric acid removes concentrated nitric acid bleaching process, comes out from gas-liquid separator
Tail gas recycled by tower exhaust ejector, acid water enters the recycling of tower tail water circulating slot, by circulation, tower tail water
Concentration of nitric acid is sent to the recycling of dust technology device after reaching 18%；
S5: carrying out the evaporation of magnesium nitrate, and the dust technology magnesium solution in dust technology magnesium storage tank is pumped into nitric acid through dust technology magnesium
Magnesium evaporator is evaporated in vacuo concentrate in evaporator, evaporates endpoint concentration 77%, and gained concentrated nitric acid magnesium solution flows into concentrated nitric acid magnesium
Storage tank is used through concentrated nitric acid magnesium pump circulation；
S6: the steam containing nitre that step S5 is evaporated enters acid separator, isolates most nitre contained in steam
Acid is sent to tower tail water slot, and steam enters indirect cooler, and magnesium tail water circulating slot is entered after condensation, and acid content can drop in magnesium tail water
As low as 0.1% hereinafter, incoagulable gas is extracted out through magnesium tail injector, the vacuum degree of system is kept, magnesium tail water is carried out with circulating pump
It is recycled, is sent to dust technology device as needed as water is absorbed, remaining can supplement recirculated water use.
The group of gaseous mixture becomes oxygen and nitrogen, and the volume ratio 2:1 of oxygen and nitrogen, and the wherein temperature of platinum-rhodium alloy net in step S2
Degree is 800 DEG C.
Nitric acid in step S3 in mixer is made of concentrated nitric acid and dust technology, and wherein the ratio of concentrated nitric acid is 2~3
Part, dust technology is 1 part, and the secondary steam generated in magnesium nitrate heater enters concentration tower bottom, the heat as distillation procedure
Source.
Steps are as follows for concentrated nitric acid bleaching process in step S4:
A1: the concentrated nitric acid come from concentrated nitric acid enrichment process enters at the top of bleaching tower through bleaching acid seal, enters with tower lower part
Air carries out mass transport process in tower packing superinverse stream, and a small amount of nitrogen oxides dissolved in concentrated nitric acid gets into the air；
A2: it is recycled with the bleaching injector that air enters on tower tail water circulating slot, qualified concentrated nitric acid is sent to finished product
Concentrated nitric acid tank, bleaching air is warming up to 50 degrees Celsius into first passing around air preheater before tower, to improve bleaching effect, bleaching
Injector maintains the operation of bleaching system tiny structure.
Vacuum degree in the vacuum evaporation concentrate of step S5 is 63KPa.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (5)
1. the technique that a kind of dust technology adds dehydrating agent to produce concentrated nitric acid, which comprises the following steps:
S1: carrying out the preparation of nitric acid magnesium liquid first, and desalted water is added changing in magnesium slot, is heated to 60~90 DEG C with low-pressure steam,
Then solid nitric acid magnesium being slowly added in slot again, while is stirred with compressed air, nitric acid magnesium density reaches 40%~
It is sent after 50% to magnesium nitrate evaporization process；
S2: carrying out the preparation of dust technology, manufactures dust technology using ammonia oxidation, the gaseous mixture of ammonia and air is passed through to scorching hot platinum
Rhodium alloy net, under the catalysis of alloy network, ammonia is oxidized to nitric oxide, and the nitric oxide of generation utilizes oxygen remaining after reaction
Gas continues to be oxidized to nitrogen dioxide, and then nitrogen dioxide is passed through in water and produces nitric acid, the concentration of nitric acid produced be 65%~
68%；
S3: the dust technology come from step S2 is sent to dust technology head tank, enters mixer, concentrated nitric acid magnesium by dust technology flowmeter
Solution is pumped into concentrated nitric acid magnesium head tank by concentrated nitric acid magnesium, enters mixer and nitric acid by concentrated nitric acid magnesium flow ratio regulating valve
Mixing, nitric acid and concentrated nitric acid magnesium mixed liquor enter in the middle part of concentration tower, and concentrated nitric acid magnesium solution, which absorbs, becomes dilute after moisture in dust technology
Nitric acid beautifying liquid flows into magnesium nitrate heater from tower bottom, flows into dust technology magnesium slot after heating is out of stock；
S4: on the basis of step S3, carrying section by concentration tower for the nitric acid vapor of content 80%~90%, and purifying is 98.0%
Above nitric acid vapor, is condensed into concentrated nitric acid into nitric acid condenser, is allocated acid seal, about 2/3 using vapour liquid separator
Concentrated nitric acid by reflux acid seal return concentration tower, about 1/3 concentrated nitric acid removes concentrated nitric acid bleaching process, goes out from gas-liquid separator
The tail gas come is recycled by tower exhaust ejector, and acid water enters the recycling of tower tail water circulating slot, by circulation, tower tail
Water concentration of nitric acid is sent to the recycling of dust technology device after reaching 15%~20%；
S5: carrying out the evaporation of magnesium nitrate, and the dust technology magnesium solution in dust technology magnesium storage tank is pumped into magnesium nitrate through dust technology magnesium and steams
Device is sent out, concentrate is evaporated in vacuo in evaporator, evaporates endpoint concentration 76%~78%, gained concentrated nitric acid magnesium solution flows into concentrated nitric acid
Magnesium storage tank is used through concentrated nitric acid magnesium pump circulation；
S6: the steam containing nitre that step S5 is evaporated enters acid separator, isolates most nitric acid contained in steam, send
To tower tail water slot, steam enters indirect cooler, and magnesium tail water circulating slot is entered after condensation, and acid content can be reduced in magnesium tail water
0.1% hereinafter, incoagulable gas keeps the vacuum degree of system, magnesium tail water is recycled with circulating pump through the extraction of magnesium tail injector
It uses, is sent to dust technology device as needed as water is absorbed, remaining can supplement recirculated water use.
2. the technique that a kind of dust technology according to claim 1 adds dehydrating agent to produce concentrated nitric acid, it is characterised in that: step S2
The group of middle gaseous mixture becomes oxygen and nitrogen, and the volume ratio 2:1 of oxygen and nitrogen, and wherein the temperature of platinum-rhodium alloy net is 760~840
℃。
3. the technique that a kind of dust technology according to claim 1 adds dehydrating agent to produce concentrated nitric acid, it is characterised in that: step S3
Nitric acid in middle mixer is made of concentrated nitric acid and dust technology, and wherein the ratio of concentrated nitric acid is 2~3 parts, and dust technology is 1 part,
And the secondary steam generated in magnesium nitrate heater enters concentration tower bottom, the heat source as distillation procedure.
4. the technique that a kind of dust technology according to claim 1 adds dehydrating agent to produce concentrated nitric acid, it is characterised in that: step S4
In concentrated nitric acid bleaching process steps are as follows:
A1: the concentrated nitric acid come from concentrated nitric acid enrichment process enters at the top of bleaching tower through bleaching acid seal, the air entered with tower lower part
Mass transport process is carried out in tower packing superinverse stream, a small amount of nitrogen oxides dissolved in concentrated nitric acid gets into the air；
A2: being recycled with the bleaching injector that air enters on tower tail water circulating slot, and qualified concentrated nitric acid is sent to the dense nitre of finished product
Acid storage tank, bleaching air is warming up to 50 degrees Celsius into first passing around air preheater before tower, to improve bleaching effect, bleaching injection
Device maintains the operation of bleaching system tiny structure.
5. the technique that a kind of dust technology according to claim 1 adds dehydrating agent to produce concentrated nitric acid, it is characterised in that: step S5
Vacuum evaporation concentrate in vacuum degree be 60-65KPa.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021129404A1 (en) * | 2019-12-27 | 2021-07-01 | 苏州晶洲装备科技有限公司 | Device and method for recycling waste acid liquid for polycrystalline silicon texturing |
| CN113479856A (en) * | 2021-08-17 | 2021-10-08 | 山西东锦肥业有限公司 | Efficient and energy-saving process for preparing nitric acid by using medium-pressure method |
| CN115784179A (en) * | 2022-11-17 | 2023-03-14 | 安徽金禾实业股份有限公司 | Process for co-producing nitric acid with various concentrations through super-azeotropic rectification |
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| US2999009A (en) * | 1958-09-05 | 1961-09-05 | Hercules Powder Co Ltd | Purification of magnesium nitrate dehydrating solution employed in nitric acid manufacture |
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| CN104211026A (en) * | 2014-08-20 | 2014-12-17 | 山东洪达化工有限公司 | Process for preparing concentrated nitric acid |
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| CN108557786A (en) * | 2018-05-17 | 2018-09-21 | 宁夏润夏能源化工有限公司 | A kind of production equipment of magnesium nitric acid process production concentrated nitric acid |
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| US2999009A (en) * | 1958-09-05 | 1961-09-05 | Hercules Powder Co Ltd | Purification of magnesium nitrate dehydrating solution employed in nitric acid manufacture |
| US4966276A (en) * | 1988-02-22 | 1990-10-30 | Guenkel Alfred A | Processes for concentrating nitric acid |
| CN101687642A (en) * | 2007-07-09 | 2010-03-31 | 巴斯夫欧洲公司 | Process for preparing nitric acid having a concentration in the range from 50 to 77.8% by weight |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2021129404A1 (en) * | 2019-12-27 | 2021-07-01 | 苏州晶洲装备科技有限公司 | Device and method for recycling waste acid liquid for polycrystalline silicon texturing |
| CN113479856A (en) * | 2021-08-17 | 2021-10-08 | 山西东锦肥业有限公司 | Efficient and energy-saving process for preparing nitric acid by using medium-pressure method |
| CN115784179A (en) * | 2022-11-17 | 2023-03-14 | 安徽金禾实业股份有限公司 | Process for co-producing nitric acid with various concentrations through super-azeotropic rectification |
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Application publication date: 20190524 |