CN106823745A - A kind of reaction end gas regeneration technology - Google Patents
A kind of reaction end gas regeneration technology Download PDFInfo
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- CN106823745A CN106823745A CN201710094579.6A CN201710094579A CN106823745A CN 106823745 A CN106823745 A CN 106823745A CN 201710094579 A CN201710094579 A CN 201710094579A CN 106823745 A CN106823745 A CN 106823745A
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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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
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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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/507—Sulfur oxides by treating the gases with other liquids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/20—Halogens or halogen compounds
- B01D2257/204—Inorganic halogen compounds
- B01D2257/2045—Hydrochloric acid
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Abstract
The present invention relates to a kind of reaction end gas regeneration technology, belong to the technical field that escaping gas is reclaimed from tail gas.Absorbed including the first order, N roads intermediate absorption and nitration mixture absorb, the described first order is absorbed using water as initial absorption agent, after tail gas absorbs through the first order, the liquid material removing SO of generation2（g）After form concentrated hydrochloric acid；Using water as absorbent, the recovered liquid of generation absorbs intermediate absorption as supplement absorbent reuse to the first order；Without HCl（g）Tail gas deliver to the nitration mixture with oxidisability in absorbed, the SO in tail gas2（g）It is converted into nitrosyl sulfuric acid.The regeneration and treatment for being applied to containing hydrogen chloride, form waste gas of sulfur dioxide will be invented, will have the advantages that removal efficiency is high, remove stabilization.
Description
Technical field
The present invention relates to a kind of reaction end gas regeneration technology, belong to the technical field that escaping gas is reclaimed from tail gas.
Background technology
Thionyl chloride is widely used in chlorination reaction as a kind of basic chemical industry raw material, is chlorine such as by alcoholic extract hydroxyl group chlorination
It is acyl chlorides etc. for alkane or by carboxylic acid chlorination, with chlorination completely, the advantages of side reaction is few, the accessory substance for obtaining is volatility
Gas, therefore the chlorinated product of gained is easy to purifying.It is aborning the place of its reaction end gas using the greatest problem of thionyl chloride
Reason, every mole of normal thionyl chloride for participating in chlorination reaction can produce one mole of hydrogen chloride and a mole of sulfur dioxide, every mole
The thionyl chloride reacted with water can produce two moles of hydrogen chloride and a mole of sulfur dioxide.It is either normal to participate in chlorination reaction also
It is to be water dispersible after reaction terminates, can all produces substantial amounts of hydrogen chloride and sulfur dioxide gas；If be not acted upon, will necessarily
Cause serious environmental pollution.
For this using hydrogen chloride and sulfur dioxide gas as the tail gas of principal component, existing conventional processing method is point
Level absorbs：Most of mixed gas are absorbed with water first, the mixture of hydrochloric acid and sulfur dioxide is obtained；Then will not have above again
Absorbed gas is absorbed with buck, obtains the mixing spent lye containing alkali, chlorate and sulphite, and what so treatment was obtained mixes
Closing spent lye can only be processed as waste water, and processing cost is high；And the first order absorbs the mixed acid for obtaining and cannot also apply, one
As in the case of also can only with alkali and after as wastewater treatment.In other words, although this waste gas processing method is by hydrogen chloride and two
Sulfur oxide gas is converted into the waste water containing a large amount of heteroions, recycles and post processing is still more complicated, and environmental protection pressure is big, nothing
Method is recycled, and above-mentioned processing method needs a large amount of consumption alkali, and processing cost is improved.
Patent CN101121094 B disclose a kind of processing method of the type waste gas, and it passes through to control the consumption of water, use
Water carries out two grades of absorptions to the hydrogen chloride in tail gas, and the first order absorbs and obtains hydrogen chloride content close to saturation and containing a small amount of titanium dioxide
The concentrated hydrochloric acid of sulphur；The second level absorbs：With water to being absorbed through the first order after tail gas carry out second level absorption, the water of addition is not arranged
Put, obtain the watery hydrochloric acid containing a small amount of hydrogen chloride and a small amount of sulfur dioxide, the starting material with water that the watery hydrochloric acid absorbs as the first order subtracts
Use and the without sewage discharge of water are lacked, have made to be substantially free of hydrogen chloride gas in tail gas；After above-mentioned two grades of absorptions are processed, then
Third level absorption is carried out with alkali or buck, the sulfur dioxide in tail gas is absorbed, sodium sulfite aqueous solution can be obtained.The first order is inhaled
The concentrated hydrochloric acid containing a small amount of sulfur dioxide produced by receiving can be used after scrubbing CO_2 as industrial concentrated hydrochloric acid, waste water row
Put and greatly reduce.The method has carried out effective recycling to the hydrogen chloride in tail gas；But to containing a small amount of hydrogen chloride and water
SO 2 tail gas, can only also use base extraction, sodium sulfite crude product can be prepared, due to there is hydrogen chloride and water, it is difficult to make
The sodium sulfite product of standby high content.
Meanwhile, in thionyl chloride building-up process（Mainly chlorination reaction）In, due to every mole of normal participation chlorination reaction
Thionyl chloride can produce one mole of hydrogen chloride and a mole of sulfur dioxide, every mole can produce two with the thionyl chloride of water reaction
Mole hydrogen chloride and one mole of sulfur dioxide, specifically react referring to formula（1）It is shown：
………(1)
Above-mentioned course of reaction causes content of sulfur dioxide and the total amount in reaction end gas to fluctuate, and then causes vent gas treatment work
Skill is unstable, and when being absorbed using alkali, the content of feed intake alkali number and product sodium sulfite is all unstable, therefore, above-mentioned side
There is larger limitation in method, limit further effective utilization of sulfur dioxide.
Based on this, the application is made.
The content of the invention
For existing containing HCl（g）、SO2（g）Existing processing cost is high during tail gas absorption, recycle efficiency low
Etc. defect, the application provides a kind of Vapor recovery unit, is capable of achieving to recycle, reclaims product utilization rate reaction end gas regeneration work high
Skill.
A kind of reaction end gas regeneration technology, including the first order absorbs, N roads intermediate absorption and nitration mixture absorb, described first
Level is absorbed and is absorbed with water or/and supplement absorbent, after tail gas absorbs through the first order, the liquid material removing SO of generation2（g）
Form concentrated hydrochloric acid；Using water as absorbent, the recovered liquid of generation absorbs intermediate absorption as supplement absorbent reuse to the first order；
Without HCl（g）Tail gas deliver to the nitration mixture with oxidisability in absorbed, the SO in tail gas2（g）It is converted into nitrosyl sulphur
Acid.
Further, as preferred：
During described nitration mixture absorbs, nitration mixture is formed by concentrated nitric acid and concentrated sulfuric acid mixture, the mixture mass ratio of concentrated nitric acid and the concentrated sulfuric acid
It is 1.3-1.8:1, it is 10-30 DEG C to absorb temperature.It is furthermore preferred that concentrated nitric acid is 1.5-1.7 with the mixture mass ratio of the concentrated sulfuric acid:1,
It is 15-25 DEG C to absorb temperature.
In described nitration mixture, the mass concentration of concentrated nitric acid is 65-80%, and the mass concentration of the concentrated sulfuric acid is 70-98%.More preferably
, described concentrated nitric acid mass concentration is 70%, and the mass concentration of the concentrated sulfuric acid is 96%.Dense nitre using mass concentration less than 80%
Acid（Preferably 70%, now its volatilization is relatively stablized, and will not produce a large amount of HNO3Volatile matter）It is possible to prevente effectively from it is largely waved
Hair forms new impurity and is mixed into tail gas, while also having played the oxidation of concentrated nitric acid；It is dense less than 98% using mass concentration
Sulfuric acid（Preferably 96%）, facilitate it with concentrated nitric acid mixture, it is possible to effectively play its oxidisability, by the SO in tail gas2（g）Hurry up
Speed is efficiently converted into nitrosyl sulfuric acid.
Described N=1, now intermediate absorption be second level absorption, the second level is absorbed using water as absorbent, and from the
Two grades of top inputs of absorption, the tail gas after first order absorption treatment absorbs top discharge from the first order, and is absorbed by the second level
Bottom feeding, tail gas through water absorb after, the diluted acid of generation（Watery hydrochloric acid）The solution feeding first order is absorbed as supplement absorbent,
Aqueous SO after the absorption treatment of the second level2Tail gas is absorbed in being then sent directly into nitration mixture.
Described N >=2, now intermediate absorption is absorbed by the second level, the third level absorbs ..., and N grades of absorption is constituted, the second level
Absorb, the third level is absorbed using water as absorbent, the top that wherein second level absorbs is input into water, after first order absorption is processed
Tail gas from the first order absorb top discharge, and by the second level absorb bottom send into, tail gas through water absorb after, the diluted acid of generation
（Watery hydrochloric acid）The solution feeding first order is absorbed as supplement absorbent, aqueous, HCl SO after second level absorption treatment2Tail gas is passed through
The third level absorbs bottom input；Top input water is absorbed from the third level, the tail gas during the third level is absorbed carries out the absorption of the 3rd road,
The diluted acid of generation is used as supplement absorbent etc., aqueous, HClSO after treatment2Tail gas feeding next stage absorbs, successively class
Push away, the tail gas after N grades of absorption treatment is aqueous SO2Tail gas, is sent directly into nitration mixture and is absorbed.
During the described first order absorbs, the SO of liquid material removing2（g）Confuse partial removal HCl waste gas out in the lump
SO is carried out into intermediate absorption2（g）Collect, both avoid SO2（g）Direct discharge, again can be by SO2（g）It is enriched with, is united
One is converted into nitrosyl sulfuric acid in nitration mixture absorption.
In described treatment process, during every mole of vent gas treatment, the initial absorption agent that the first order absorbs addition is 100g water,
The absorbent of every grade of intermediate absorption addition is 100g water.
Described nitration mixture is enough or excessive consumption, and every mole of tail gas correspondence 350g mixed acid solution is absorbed.
Compared with conventional treatment mode, the operation principle of the application and have the beneficial effect that：
（1）The main component of tail gas is converted into recovery product, and these recovery product impurity contents are few, can be used directly.
The pending object of the application is the tail gas with hydrogen chloride gas and sulfur dioxide gas as main component, first will with water-washing method
Hydrogen chloride is converted into hydrochloric acid solution, the concentrated hydrochloric acid in the hydrochloric acid solution（It is main to be produced in first order absorption）Scrubbing CO_2
After unstable hydrogen chloride, impurity is substantially free of, can be used directly as the first recovery finished product；In tail gas after washing not
When chloride, then the sulfur dioxide gas oxidation reaction in tail gas is formed into nitrosyl sulfuric acid with nitration mixture, the nitrosyl sulfuric acid is free of
Free sulphur, therefore can be used directly as the second recovery product.
（2）Hydrogen chloride gas in tail gas are soluble in water, meet water and are converted into hydrochloric acid, and concentrated hydrochloric acid therein is used as recovery product
Use, and in absorption process be more the generation of watery hydrochloric acid, these watery hydrochloric acid are main to be formed in intermediate absorption, due to exhausted
Most hydrogen chloride is all converted into hydrochloric acid in first order absorption, and the hydrogen chloride content for bringing rear road absorption into is smaller, causes to inhale
Concentration of hydrochloric acid is relatively low in receiving the liquid material for producing, and directly discharge is obviously unfavorable for environmental protection, is used as product is reclaimed, and needs
The larger cost of input and energy consumption are concentrated and purified, the application as supplement absorbent be applied to the first order absorb or
During corresponding preceding road absorbs, directly digestion not only reduces the usage amount of pure water in the system of regeneration technology, also
Turn waste into wealth, be translated into absorbent and use, due to what is produced during the supplement absorbent inherently tail gas absorption, because
Without bringing new component into, and the enrichment of chlorine is realized in absorption process, reach energy-conserving and environment-protective, low-loss and utilization rate effect high
Really.
（3）Sulfur dioxide is absorbed by nitration mixture in this application, and sulfur dioxide is dissolved in water and forms unstable
Sulfurous acid, therefore, in the processing procedure of the application, absorbed together by the sulfur dioxide removal entered in solution and after being enriched to
In, concentrate carries out oxidation processes using the nitration mixture with oxidisability, forms the nitrosyl sulfuric acid of stabilization.In nitration mixture processing procedure
In, nitration mixture is excessive or enough is absorbed, it is ensured that the abundant thorough absorption of sulfur dioxide, makes the technique to titanium dioxide in tail gas
Sulphur net content and total amount are less demanding, content of sulfur dioxide fluctuation（Water content is just）With total amount fluctuation product shadow is reclaimed to second
Sound can be ignored, and make the Vapor recovery unit of sulfur dioxide；Meanwhile, even if containing in the second recovery product nitrosyl sulfuric acid for being formed
There is a certain amount of nitration mixture, also have no effect on the normal of nitrosyl sulfuric acid and use, and sulfur dioxide in tail gas absolutely not contains trip
From sulphur.Although industrial useful pure sulfur dioxide prepares the technology of nitrosyl sulfuric acid, to the purity of raw material sulfur dioxide
It is required that it is very high, generally more than 99%, and there is strict demand to free sulfur content contained therein（0.1% is generally less than,
Seeking naked eyes can not observe free sulphur, and finished product needs to be controlled free sulfur content）.The application is processed with nitration mixture absorption pattern
The scheme of sulfur dioxide has satisfactorily resolved the sulfur dioxide in the mixed tail gas produced by thionyl chloride, prevented routine techniques with
Industrial goods sulfur dioxide prepares the defect containing free sulphur in nitrosyl sulfuric acid method.
Brief description of the drawings
Fig. 1 is the process chart of the application.
Specific embodiment
The initial start respectively to regeneration technology of embodiment 1 and embodiment 2 and normal operating condition carry out the elaboration of scheme；
Embodiment 3 then prepares the elaboration that technical scheme is carried out based on nitrosyl sulfuric acid with nitration mixture absorption.
Embodiment 1
The present embodiment mainly includes two steps：
（1）The absorption of thionyl chloride tail gas prepares concentrated hydrochloric acid
The chlorination reaction tail gas of 1mol thionyl chlorides is carried out into two stage countercurrent absorptions with water respectively, wherein, the first order adds in absorbing
Plus 100g water, its liquid product（Hydrochloric acid）It is to obtain industrial concentrated hydrochloric acid A through scrubbing CO_2；100g is added in absorbing in the second level
Water, the second level absorbs the first order absorption aqueous solution that the watery hydrochloric acid B for obtaining is used as lower batch of material；Unabsorbed gases（It is main into
Part is sulfur dioxide, containing a small amount of hydrogen chloride and water）Into step（2）.
（2）Nitration mixture absorption prepares nitrosyl sulfuric acid
By step（1）In do not absorb gas（Main Ingredients and Appearance is sulfur dioxide, containing a small amount of hydrogen chloride and water）, then by 100 grams
Water absorbs（That is the third level in Fig. 1 absorbs）Afterwards, content of sulfur dioxide 95%, water content 5%, with 350 grams of mixed acid solutions after testing
（Prepared by 140 gram of 70% concentrated nitric acid and 210 gram of 96% concentrated sulfuric acid）Absorb, absorb temperature control needs inhale for 1 hour at 15-20 DEG C, about
Harvest complete.
Detected with permanganimetric method：The content of nitrosyl sulfuric acid is 43%, without chlorion.
Embodiment 2
（1）The absorption of thionyl chloride tail gas prepares concentrated hydrochloric acid
The chlorination reaction tail gas of 1mol thionyl chlorides is carried out into two stage countercurrent absorptions, wherein：The first order is absorbed with embodiment 1
Used as absorbent, resulting concentrated hydrochloric acid is to obtain industrial dense salt through scrubbing CO_2 to watery hydrochloric acid B obtained by the absorption of the second level
Acid, supplement 100g water is absorbed when the second level absorbs, and the watery hydrochloric acid for obtaining is used as the first order absorption aqueous solution of lower batch of material.Not by
The gas of absorption（Main Ingredients and Appearance is sulfur dioxide, containing a small amount of hydrogen chloride and water）Absorbed into next stage.
（2）Nitration mixture absorption prepares nitrosyl sulfuric acid
By step（1）In do not absorb gas（Main Ingredients and Appearance is sulfur dioxide, containing a small amount of hydrogen chloride and water）, then by 100 grams
After water absorbs（Content of sulfur dioxide 96%, water content 4% after testing）, it is molten with 350 grams of nitration mixture by the concentrated sulfuric acid and concentrated nitric acid preparation
Liquid（Prepared by 130 gram of 70% concentrated nitric acid and 220 gram of 96% concentrated sulfuric acid）Absorb, absorb temperature control between 15-20 DEG C, about need 1
Hour absorbs and finishes, and the content of permanganimetric method detection nitrosyl sulfuric acid is 41%, is detected without chlorion.
Embodiment 3：The determination of nitration mixture absorption technique
（1）Influence of the difference composition nitration mixture to absorbing：In the present embodiment, the absorption of hydrogen chloride is same as Example 1, then with 100
Gram water absorbs a small amount of hydrogen chloride of residual, is absorbed with 350 grams of mixed acid solutions prepared by the concentrated sulfuric acid and concentrated nitric acid afterwards, wherein mixing
During acid is constituted, concentrated nitric acid（By taking the concentrated nitric acid that mass concentration is 70% as an example）With the concentrated sulfuric acid（With the concentrated sulfuric acid that mass concentration is 96%
As a example by）According to mass ratio 1:0.5、1:0.8、1:1、1:1.2、1:1.3、1:1.4、1:1.5、1:1.6、1:1.7、1:1.8、1:2、
1:2.2, temperature control is absorbed at 15-25 DEG C, absorption is finished, and permanganimetric method detects the content of nitrosyl sulfuric acid.
Test result indicate that, concentrated nitric acid is more than 1 with concentrated sulfuric acid mass ratio:When 1.2, as nitric acid ratio increases, part is dense
Nitric acid is evaporate into tail gas, causes to contain micro nitrous acid in tail gas, is unfavorable for production；And work as concentrated nitric acid and concentrated sulfuric acid quality
Than less than 1:When 1.2, with the reduction of concentrated nitric acid and concentrated sulfuric acid mass ratio（That is concentrated sulfuric acid proportion increase）, nitrous in finished product
The content of acyl sulfate gradually increases, but domain of walker is in 22-25%；When concentrated nitric acid and concentrated sulfuric acid mass ratio continue to be decreased to 1:1.3
When, the content of nitrosyl sulfuric acid directly rises to 40% in finished product；Continue the ratio of the increase concentrated sulfuric acid, nitrosyl sulfuric acid content increases
Amplitude long is larger, especially when concentrated nitric acid and concentrated sulfuric acid mass ratio are adjusted to 1:During 1.5-1.7, increase most fast, but continue to increase
The ratio of the concentrated sulfuric acid, amplification is successively decreased and is tended towards stability, especially when concentrated nitric acid and concentrated sulfuric acid mass ratio are adjusted to 1:It is sub- after 1.8
The content of nitryl sulfuric acid does not increase anti-drop；Continue to adjust concentrated nitric acid and concentrated sulfuric acid mass ratio is adjusted to less than 1:1.8, nitrosyl sulfuric acid
Content reduction, be unfavorable for the treatment of tail gas.
Therefore, under the conditions of same treatment, concentrated nitric acid is controlled 1 with concentrated sulfuric acid mass ratio:During 1.3-1.8, nitrosyl sulfuric acid
Content can ensure more than 41%, especially when concentrated nitric acid and concentrated sulfuric acid mass ratio are controlled 1:During 1.5-1.7, nitrosyl sulphur
The content of acid increases most fast, and can reach 45% or so.
（2）The influence that different temperatures absorbs to nitration mixture：Temperature is mainly reflected in two aspects to the influence for absorbing, and first is
Absorption efficiency, second is to consider energy consumption etc..In experimentation, when temperature is less than 10 DEG C, although be conducive to increasing chlorination
The uptake and absorption efficiency of hydrogen, but energy consumption greatly improves, and increased industrialization difficulty；And, the later stage also needs heating to steam two
Sulfur oxide, so early stage absorption temperature need not be too low.When temperature is more than 30 DEG C, temperature is higher to cause actual absorption rate to drop
Low, when temperature rises to 40 DEG C, absorption efficiency is very low, is unfavorable for quick and complete absorbing hydrogen chloride.When temperature range exists
10-30 DEG C, especially when temperature is between 15-25 DEG C, existing preferable absorption efficiency has a rational energy consumption again, therefore from
Cost considers with absorption efficiency, optimal between 15-25 DEG C of temperature of absorption.
（3）Nitration mixture is constituted and the compound action for absorbing temperature：The absorption of hydrogen chloride above is same as Example 1, then uses
100 grams of water absorb a small amount of hydrogen chloride of residual, afterwards with 350 grams of mixed acid solutions prepared by the concentrated sulfuric acid and concentrated nitric acid（Respectively by
The concentrated sulfuric acid of 70% concentrated nitric acid 96% is according to mass ratio 1:1.3、1:1.4、1:1.5、1:1.6、1:1.7、1:1.8 prepare）Absorb, absorb
Temperature controls, at 10-15 DEG C, 15-20 DEG C, 20-25 DEG C, 20-25 DEG C, 25-30 DEG C, 10-20 DEG C, about to need absorbed within 1 hour respectively
Finish, permanganimetric method detects the content of nitrosyl sulfuric acid, content is respectively 41%, 42%, 45%, 45%, 40%, 41%, detection
Without chlorion.
Industrial useful pure sulfur dioxide prepares the technology of nitrosyl sulfuric acid, but purity to raw material sulfur dioxide will
Ask very high, generally more than 99%, and have strict demand to free sulfur content contained therein（Generally it is less than 0.1%, it is desirable to
Naked eyes can not observe free sulphur, and finished product needs to be controlled free sulfur content）.The application processes titanium dioxide in nitration mixture mode
The scheme of sulphur has satisfactorily resolved the sulfur dioxide in the mixed tail gas produced by thionyl chloride, has the characteristics that：A. to tail gas
In sulfur dioxide net content and total amount it is less demanding, the fluctuation of content of sulfur dioxide（The height of water content）With the fluctuation of total amount
It is little on product influence；B. the sulfur dioxide in tail gas absolutely not contains free sulphur, and this exactly original industry law cannot be solved
Technical barrier.
Above content is combine that the preferred embodiment of the invention made to provided technical scheme further detailed
Describe in detail bright, it is impossible to assert that the invention specific implementation is confined to above-mentioned these explanations, for the affiliated technology of the invention
For the those of ordinary skill in field, without departing from the concept of the premise of the invention, some simple deductions can also be made
Or replace, should all be considered as belonging to the protection domain of the invention.
Claims (10)
1. a kind of reaction end gas regeneration technology, it is characterised in that：Absorbed including the first order, N roads intermediate absorption and nitration mixture absorb, institute
The first order stated is absorbed and is absorbed with water or/and supplement absorbent, and after tail gas absorbs through the first order, the liquid material of generation takes off
Except SO2（g）Form concentrated hydrochloric acid；, using water as absorbent, the recovered liquid of generation is used as supplement absorbent reuse to for intermediate absorption
First order absorption；Without HCl（g）Tail gas deliver to the nitration mixture with oxidisability in absorbed, the SO in tail gas2（g）It is converted into
Nitrosyl sulfuric acid, tail gas is then directly discharged.
2. a kind of reaction end gas regeneration technology as claimed in claim 1, it is characterised in that：Described N=1, now intermediate absorption
As the second level is absorbed, and the second level is absorbed using water as absorbent, and the top input absorbed from the second level, at first order absorption
Tail gas after reason absorbs top discharge from the first order, and is sent into by the bottom that the second level absorbs, after tail gas absorbs through water, generation
The dilute acid soln feeding first order is absorbed as supplement absorbent, the aqueous SO after second level absorption treatment2Tail gas is then sent directly into
Absorbed in nitration mixture.
3. a kind of reaction end gas regeneration technology as claimed in claim 1, it is characterised in that：Described N >=2, it is now middle to inhale
Receive absorbed by the second level, the third level is absorbed ..., and N grade absorption is constituted, second level absorption, third level absorption are using water as absorption
The top input water that agent, the wherein second level absorb, tail gas after first order absorption is processed absorbs top discharge from the first order, and
The bottom absorbed by the second level is sent into, and after tail gas absorbs through water, the dilute acid soln feeding first order of generation absorbs inhales as supplement
Receive agent, aqueous, HCl SO after second level absorption treatment2Tail gas absorbs bottom and is input into through the third level；It is defeated top to be absorbed from the third level
Enter water, the tail gas during the third level is absorbed carries out the absorption of the 3rd road, and the diluted acid of generation is used as supplement absorbent etc., after treatment
Aqueous, HClSO2Tail gas feeding next stage absorbs, the like, the tail gas after N grades of absorption treatment is aqueous SO2Tail gas, directly
Pick and absorbed in nitration mixture.
4. a kind of reaction end gas regeneration technology as claimed in claim 1, it is characterised in that：During the described first order absorbs, liquid
The SO of state material removing2（g）Partial removal HCl waste gas out is confused in the lump into carrying out SO in intermediate absorption2（g）Collect.
5. a kind of reaction end gas regeneration technology as described in claim any one of 1-4, it is characterised in that：Described nitration mixture absorbs
In, nitration mixture is formed by concentrated nitric acid and concentrated sulfuric acid mixture, and concentrated nitric acid is 1.3-1.8 with the mixture mass ratio of the concentrated sulfuric acid:1, absorb temperature
Spend is 10-30 DEG C.
6. a kind of reaction end gas regeneration technology as claimed in claim 5, it is characterised in that：Described concentrated nitric acid and the concentrated sulfuric acid
Mixture mass ratio is 1.5-1.7:1, it is 15-25 DEG C to absorb temperature.
7. a kind of reaction end gas regeneration technology as described in claim any one of 1-4, it is characterised in that：In described nitration mixture,
Nitration mixture is formed by concentrated nitric acid and concentrated sulfuric acid mixture, and the mass concentration of concentrated nitric acid is 65-80%, and the mass concentration of the concentrated sulfuric acid is 70-
98%。
8. a kind of reaction end gas regeneration technology as claimed in claim 7, it is characterised in that：Described concentrated nitric acid mass concentration is
70%, the mass concentration of the concentrated sulfuric acid is 96%.
9. a kind of reaction end gas regeneration technology as claimed in claim 8, it is characterised in that：In described treatment process, often rub
During your vent gas treatment, the initial absorption agent that the first order absorbs addition is 100g water, and the absorbent of every grade of intermediate absorption addition is
100g water.
10. a kind of reaction end gas regeneration technology as described in claim 1,8 or 9, it is characterised in that：Described nitration mixture it is enough or
Person's excessive consumption.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109821377A (en) * | 2019-03-18 | 2019-05-31 | 南京蓝胜环保科技有限公司 | A kind of NOx, HF, HCl, caustic soda mist and inertia tail gas absorption processing unit and technique |
| CN112691515A (en) * | 2020-12-25 | 2021-04-23 | 宁夏中盛新科技有限公司 | Treatment method for recycling acid waste gas resources |
| CN113368680A (en) * | 2021-04-28 | 2021-09-10 | 宁夏中盛新科技有限公司 | Accurate exhaust treatment device of quantity |
| CN114314532A (en) * | 2022-01-11 | 2022-04-12 | 江苏飞宇医药科技股份有限公司 | Process for preparing nitroso-sulfuric acid by recycling sulfur dioxide in tail gas generated in production of cyclopropylamine |
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| CN101121094A (en) * | 2007-07-17 | 2008-02-13 | 高邮市有机化工厂 | Method for treating tail gas of thionyl chloride chlorination |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109821377A (en) * | 2019-03-18 | 2019-05-31 | 南京蓝胜环保科技有限公司 | A kind of NOx, HF, HCl, caustic soda mist and inertia tail gas absorption processing unit and technique |
| CN112691515A (en) * | 2020-12-25 | 2021-04-23 | 宁夏中盛新科技有限公司 | Treatment method for recycling acid waste gas resources |
| CN113368680A (en) * | 2021-04-28 | 2021-09-10 | 宁夏中盛新科技有限公司 | Accurate exhaust treatment device of quantity |
| CN114314532A (en) * | 2022-01-11 | 2022-04-12 | 江苏飞宇医药科技股份有限公司 | Process for preparing nitroso-sulfuric acid by recycling sulfur dioxide in tail gas generated in production of cyclopropylamine |
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Application publication date: 20170613 |