CN109721080A - A kind of production technology of desulfurization sodium sulfite - Google Patents
A kind of production technology of desulfurization sodium sulfite Download PDFInfo
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- CN109721080A CN109721080A CN201910005286.5A CN201910005286A CN109721080A CN 109721080 A CN109721080 A CN 109721080A CN 201910005286 A CN201910005286 A CN 201910005286A CN 109721080 A CN109721080 A CN 109721080A
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- sodium sulfite
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Abstract
The invention discloses a kind of production technologies of desulfurization sodium sulfite, comprising steps of the flue gas containing sulfur dioxide is passed through in absorbing liquid by a., form the first mixed solution；B. sodium hydroxide solution is added into first mixed solution, obtains the second mixed solution；C. the second mixed solution is filtered, obtains the first filtrate and the first filter residue；D. active carbon is added into the first filtrate, obtains decoloration mixing liquid；E. decoloration mixing liquid is filtered, obtains the second filtrate and the second filter residue；F. the second filtrate is evaporated concentration, obtains the first product；G. the first product is centrifuged, obtains sodium sulfite and mother liquor；H. sodium sulfite is dried and is packed to get finished product is arrived.Compared with prior art, whole process of the invention does not generate emission performance pollutant, realizes effective recycling to sulfur dioxide, is conducive to environmental protection, has preferable economic benefit and social benefit；It uses active carbon to decolourize, and is obviously improved the quality of sodium sulfite.
Description
Technical field
The present invention relates to the production technology of sodium sulfite, in particular to a kind of production technology of desulfurization sulfurous acid.
Background technique
How major issue that sulfur dioxide in flue gas during smelting be always metallurgical department concern is recycled.Certainly, it adopts
With flue gas during smelting production industrial sulphuric acid be approach the most successful, but with regard to current technology and equipment from the point of view of, one side sulphur
Acid production has certain requirement to the content of sulfur dioxide in flue gas, and on the other hand, product sulfuric acid stored, is transported and market etc.
The restriction of factor.Therefore, how new product further is developed using sulfur dioxide flue gas, for Environment control, reduces Sulphur ressource
It is lost, is a very significant job.Since phase late 1980s, the Northwest's paper-making industry is gradually in prosperity
Gesture increases the sodium sulfite demand of processing paper pulp.In view of this, the present invention passes through further investigation, by two in flue gas
Sulfur oxide obtains a kind of production technology of desulfurization sodium sulfite for producing sodium sulfite.
Summary of the invention
The object of the present invention is to provide a kind of production technologies of desulfurization sodium sulfite, and small pollution of the environment can
Realize the production of high-quality sodium sulfite.
Above-mentioned technical purpose of the invention has the technical scheme that
A kind of production technology of desulfurization sodium sulfite, comprising steps of
A. the flue gas containing sulfur dioxide is passed through in absorbing liquid, forms the sulfurous for being 25%-30% containing mass concentration
First mixed solution of the sodium sulphate of sour hydrogen sodium, the sodium sulfite of 5%-8% and 0%-7%, first mixed solution
PH value is 5-6, the absorbing liquid contain mass concentration be the sodium hydrogensulfite of 0%-3%, 20%-30% sodium sulfite and
The sodium sulphate of 0%-7%, pH value 6.5-7.5；
B. the sodium hydroxide solution that mass concentration is 25%-35% is added into first mixed solution, so that first
Sodium hydrogensulfite in mixed solution reacts completely with sodium hydroxide, obtains the second mixed solution；
C. the second mixed solution is filtered, obtains the first filtrate and the first filter residue；
D. active carbon is added into the first filtrate, obtains decoloration mixing liquid；
E. decoloration mixing liquid is filtered, obtains the second filtrate and the second filter residue；
F. the second filtrate is evaporated concentration, obtains the first product；
G. the first product is centrifuged, obtains sodium sulfite and mother liquor；
H. sodium sulfite is dried and is packed to get finished product is arrived.
Further to improve, the pH value of the second mixed solution is 6.5-7.5 in step b.
Further to improve, step d is 1h-2h by the time.
It is further to improve, i. is further comprised the steps of: by the step g mother liquor generated and is evaporated concentration, is then centrifuged
Separation.
Compared with prior art, the present invention provides a kind of production technology of desulfurization sodium sulfite, and whole process does not produce
Raw emission performance pollutant, realizes effective recycling to sulfur dioxide, has achieved the purpose that comprehensive reutilization resource, be conducive to
Environmental protection has preferable economic benefit and social benefit；It uses active carbon to decolourize, and is obviously improved sulfurous obtained
The quality of sour sodium.
Detailed description of the invention
Fig. 1 is the system construction drawing for implementing a kind of desulfurization sulfurous acid production process of the invention.
In figure
Absorbing liquid storage tank -1；Neutralization chamber -2；Decolorizing purification slot -3；
Filtering table -4；First storage tank -5；MVR evaporated crystallization device -6；
Centrifuge -7；Second storage tank -8；Dry kiln -9.
Specific embodiment
Below in conjunction with attached drawing, invention is further described in detail.
This specific embodiment is only explanation of the invention, is not limitation of the present invention, those skilled in the art
Member can according to need the modification that not creative contribution is made to the present embodiment after reading this specification, but as long as at this
All by the protection of Patent Law in the scope of the claims of invention.
Embodiment one:
A kind of production technology of desulfurization sodium sulfite, comprising steps of
A. the flue gas containing sulfur dioxide is passed through in absorbing liquid, forms the sodium hydrogensulfite for being 25% containing mass concentration
With the first mixed solution of 5% sodium sulfite, the pH value of first mixed solution is 5, and the absorbing liquid contains 20%
Sodium sulfite, pH value 6.5；
B. the sodium hydroxide solution that mass concentration is 25% is added into first mixed solution, so that the first mixing is molten
Sodium hydrogensulfite in liquid reacts completely with sodium hydroxide, obtains the second mixed solution, and the pH value of the second mixed solution is 6.5；
The reaction of generation are as follows:
NaHSO3+ NaOH=Na2SO3+H2O
NaHSO4+ NaOH=Na2SO4+H2O
C. the second mixed solution is filtered, obtains the first filtrate and the first filter residue；
D. active carbon is added into the first filtrate, is 1h by the time, obtain decoloration mixing liquid；
E. decoloration mixing liquid is filtered, obtains the second filtrate and the second filter residue；
F. the second filtrate is evaporated concentration, obtains the first product；
G. the first product is centrifuged, obtains sodium sulfite and mother liquor；
H. sodium sulfite is dried and is packed to get finished product is arrived.
I. the step g mother liquor generated is evaporated concentration, be then centrifuged.
Embodiment two:
A kind of production technology of desulfurization sodium sulfite, comprising steps of
A. the flue gas containing sulfur dioxide is passed through in absorbing liquid, forms the bisulfite for being 30% containing mass concentration
First mixed solution of sodium, 8% sodium sulfite and 7% sodium sulphate, the pH value of first mixed solution is 6, described
Absorbing liquid contain mass concentration be 3% sodium hydrogensulfite, 30% sodium sulfite and 7% sodium sulphate, pH value 7.5；
B. the sodium hydroxide solution that mass concentration is 35% is added into first mixed solution, so that the first mixing is molten
Sodium hydrogensulfite in liquid reacts completely with sodium hydroxide, obtains the second mixed solution, and the pH value of the second mixed solution is 7.5；
The reaction of generation are as follows:
NaHSO3+ NaOH=Na2SO3+H2O
NaHSO4+ NaOH=Na2SO4+H2O
C. the second mixed solution is filtered, obtains the first filtrate and the first filter residue；
D. active carbon is added into the first filtrate, is 2h by the time, obtain decoloration mixing liquid；
E. decoloration mixing liquid is filtered, obtains the second filtrate and the second filter residue；
F. the second filtrate is evaporated concentration, obtains the first product；
G. the first product is centrifuged, obtains sodium sulfite and mother liquor；
H. sodium sulfite is dried and is packed to get finished product is arrived.
I. the step g mother liquor generated is evaporated concentration, be then centrifuged.
Embodiment three:
A kind of production technology of desulfurization sodium sulfite, comprising steps of
A. the flue gas containing sulfur dioxide is passed through in absorbing liquid, forms the bisulfite for being 28% containing mass concentration
First mixed solution of sodium, 7% sodium sulfite and 4% sodium sulphate, the pH value of first mixed solution are 5.5, institute
State absorbing liquid contain mass concentration be 2% sodium hydrogensulfite, 25% sodium sulfite and 4% sodium sulphate, pH value 7；
B. the sodium hydroxide solution that mass concentration is 30% is added into first mixed solution, so that the first mixing is molten
Sodium hydrogensulfite in liquid reacts completely with sodium hydroxide, obtains the second mixed solution, and the pH value of the second mixed solution is 7；
The reaction of generation are as follows:
NaHSO3+ NaOH=Na2SO3+H2O
NaHSO4+ NaOH=Na2SO4+H2O
C. the second mixed solution is filtered, obtains the first filtrate and the first filter residue；
D. active carbon is added into the first filtrate, is 1.5h by the time, obtain decoloration mixing liquid；
E. decoloration mixing liquid is filtered, obtains the second filtrate and the second filter residue；
F. the second filtrate is evaporated concentration, obtains the first product；
G. the first product is centrifuged, obtains sodium sulfite and mother liquor；
H. sodium sulfite is dried and is packed to get finished product is arrived.
I. the step g mother liquor generated is evaporated concentration, be then centrifuged.
Fig. 1 be a kind of system construction drawing of the production technology of desulfurization sodium sulfite, including absorbing liquid storage tank 1, in
With slot 2, decolorizing purification slot 3, filtering table 4, the first storage tank 5, MVR evaporated crystallization device 6, centrifuge 7, the second storage tank 8 and drying
Kiln 9, the flue gas containing sulfur dioxide are passed into the absorbing liquid storage tank 1 first and are absorbed, the first mixed solution of formation, and first
Mixed solution enters in the neutralization chamber 2, and sodium hydroxide solution is added into neutralization chamber 2 and carries out neutralization, it is mixed to obtain second
Solution is closed, the first filtrate and the first filter residue will be formed after the filtering of the second mixed solution, the first filtrate is passed through the decolorizing purification
In slot 3, decoloration mixing liquid is formed by decoloration mixing liquid by the filtering table 4 and obtains the second filtrate and the second filter residue,
Second filtrate enters in the first storage tank 5 and stores, and the second filtrate is passed through in MVR evaporated crystallization device 6, is evaporated concentration knot
Crystalline substance obtains the first product, and the first product is put into the centrifuge 7, sodium sulfite and mother liquor is obtained, sodium sulfite is put into
It is dried in dry kiln 9, is then packed, finished product, mother liquor enters in the second storage tank 8, turns again to MVR evaporation knot
Brilliant device 6 is evaporated condensing crystallizing.
The above-mentioned description to embodiment be for convenient for those skilled in the art understand and using the present invention, it is ripe
The personnel for knowing art technology obviously easily can make various modifications to embodiment, and General Principle described herein is answered
It uses in other embodiments without having to go through creative labor.Therefore, the present invention is not limited to the above embodiments, art technology
Personnel's announcement according to the present invention, improvement and modification made without departing from the scope of the present invention all should be in protection models of the invention
Within enclosing.
Claims (4)
1. a kind of production technology of desulfurization sodium sulfite, which is characterized in that comprising steps of
A. the flue gas containing sulfur dioxide is passed through in absorbing liquid, forms the bisulfite for being 25%-30% containing mass concentration
First mixed solution of the sodium sulphate of sodium, the sodium sulfite of 5%-8% and 0%-7%, the pH value of first mixed solution
For 5-6, the absorbing liquid contains the sodium sulfite and 0%- that mass concentration is the sodium hydrogensulfite of 0%-3%, 20%-30%
7% sodium sulphate, pH value 6.5-7.5；
B. the sodium hydroxide solution that mass concentration is 25%-35% is added into first mixed solution, so that the first mixing
Sodium hydrogensulfite in solution reacts completely with sodium hydroxide, obtains the second mixed solution；
C. the second mixed solution is filtered, obtains the first filtrate and the first filter residue；
D. active carbon is added into the first filtrate, obtains decoloration mixing liquid；
E. decoloration mixing liquid is filtered, obtains the second filtrate and the second filter residue；
F. the second filtrate is evaporated concentration, obtains the first product；
G. the first product is centrifuged, obtains sodium sulfite and mother liquor；
H. sodium sulfite is dried and is packed to get finished product is arrived.
2. a kind of production technology of desulfurization sodium sulfite according to claim 1, which is characterized in that second is mixed in step b
The pH value for closing solution is 6.5-7.5.
3. a kind of production technology of desulfurization sodium sulfite according to claim 1, which is characterized in that when passing through of step d
Between be 1h-2h.
4. a kind of production technology of desulfurization sodium sulfite according to claim 1, which is characterized in that further comprise the steps of: i.
The step g mother liquor generated is evaporated concentration, is then centrifuged.
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| CN201910005286.5A CN109721080A (en) | 2019-01-03 | 2019-01-03 | A kind of production technology of desulfurization sodium sulfite |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110947297A (en) * | 2019-12-23 | 2020-04-03 | 中国科学院青海盐湖研究所 | Green treatment method for chlorine-containing waste gas |
| CN111792655A (en) * | 2020-07-27 | 2020-10-20 | 黄石加柯环保科技有限公司 | Method and system for extracting sodium sulfite and sodium sulfate by using flue gas containing sulfur dioxide |
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| US20080199384A1 (en) * | 2005-06-10 | 2008-08-21 | Evonik Degussa Wellink Silica (Nanping) Co. Ltd. | Process For Producing Silica, Sodium Sulfite and Sodium Hydrogen Sulfite With Sodium Sulfate |
| CN101565191A (en) * | 2009-06-01 | 2009-10-28 | 湖南永清环保股份有限公司 | Method for preparing anhydrous sodium sulfite by circularly absorbing sulfur dioxide in exhaust gas |
| CN103570046A (en) * | 2013-11-14 | 2014-02-12 | 湖南恒光化工有限公司 | Process for preparing high-purity sodium sulfite through sulfuric acid production industrial exhaust |
| CN103861426A (en) * | 2012-12-11 | 2014-06-18 | 中国石油化工集团公司 | Method for desulphurization and dust removal of flue gas and recycling of sodium sulfite |
| CN104016382A (en) * | 2014-06-27 | 2014-09-03 | 尚兰华 | Method for producing sodium sulfite by desulfurizing flue gas by double-alkali process |
-
2019
- 2019-01-03 CN CN201910005286.5A patent/CN109721080A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080199384A1 (en) * | 2005-06-10 | 2008-08-21 | Evonik Degussa Wellink Silica (Nanping) Co. Ltd. | Process For Producing Silica, Sodium Sulfite and Sodium Hydrogen Sulfite With Sodium Sulfate |
| CN101565191A (en) * | 2009-06-01 | 2009-10-28 | 湖南永清环保股份有限公司 | Method for preparing anhydrous sodium sulfite by circularly absorbing sulfur dioxide in exhaust gas |
| CN103861426A (en) * | 2012-12-11 | 2014-06-18 | 中国石油化工集团公司 | Method for desulphurization and dust removal of flue gas and recycling of sodium sulfite |
| CN103570046A (en) * | 2013-11-14 | 2014-02-12 | 湖南恒光化工有限公司 | Process for preparing high-purity sodium sulfite through sulfuric acid production industrial exhaust |
| CN104016382A (en) * | 2014-06-27 | 2014-09-03 | 尚兰华 | Method for producing sodium sulfite by desulfurizing flue gas by double-alkali process |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110947297A (en) * | 2019-12-23 | 2020-04-03 | 中国科学院青海盐湖研究所 | Green treatment method for chlorine-containing waste gas |
| CN111792655A (en) * | 2020-07-27 | 2020-10-20 | 黄石加柯环保科技有限公司 | Method and system for extracting sodium sulfite and sodium sulfate by using flue gas containing sulfur dioxide |
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