CN112093811A - Sodium sulfite production method - Google Patents
Sodium sulfite production method Download PDFInfo
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- CN112093811A CN112093811A CN202011032491.XA CN202011032491A CN112093811A CN 112093811 A CN112093811 A CN 112093811A CN 202011032491 A CN202011032491 A CN 202011032491A CN 112093811 A CN112093811 A CN 112093811A
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- Prior art keywords
- sodium sulfite
- sulfur dioxide
- absorption tower
- temperature
- sulfur
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- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 title claims abstract description 78
- 235000010265 sodium sulphite Nutrition 0.000 title claims abstract description 36
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 24
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 claims abstract description 70
- 238000010521 absorption reaction Methods 0.000 claims abstract description 47
- 229940001482 sodium sulfite Drugs 0.000 claims abstract description 35
- 239000007789 gas Substances 0.000 claims abstract description 28
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 24
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000003546 flue gas Substances 0.000 claims abstract description 17
- 239000007788 liquid Substances 0.000 claims abstract description 15
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 14
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 14
- 239000011593 sulfur Substances 0.000 claims abstract description 14
- 238000001035 drying Methods 0.000 claims abstract description 10
- 238000006386 neutralization reaction Methods 0.000 claims abstract description 10
- 238000005406 washing Methods 0.000 claims abstract description 9
- DWAQJAXMDSEUJJ-UHFFFAOYSA-M Sodium bisulfite Chemical compound [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 claims abstract description 8
- 238000001704 evaporation Methods 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims abstract description 8
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 claims abstract description 8
- 229940101006 anhydrous sodium sulfite Drugs 0.000 claims abstract description 6
- 238000001816 cooling Methods 0.000 claims abstract description 5
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 12
- AKEJUJNQAAGONA-UHFFFAOYSA-N sulfur trioxide Chemical compound O=S(=O)=O AKEJUJNQAAGONA-UHFFFAOYSA-N 0.000 claims description 6
- 239000006227 byproduct Substances 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 239000003513 alkali Substances 0.000 claims description 3
- 230000002829 reductive effect Effects 0.000 claims description 3
- 239000012452 mother liquor Substances 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 235000011121 sodium hydroxide Nutrition 0.000 abstract description 6
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 abstract description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 abstract description 4
- 239000002912 waste gas Substances 0.000 abstract description 4
- 239000001569 carbon dioxide Substances 0.000 abstract description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 abstract description 2
- 239000002994 raw material Substances 0.000 abstract description 2
- 235000017550 sodium carbonate Nutrition 0.000 abstract description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 abstract description 2
- 239000002910 solid waste Substances 0.000 abstract description 2
- 239000002351 wastewater Substances 0.000 abstract description 2
- 230000003472 neutralizing effect Effects 0.000 abstract 1
- 238000005086 pumping Methods 0.000 abstract 1
- 239000000428 dust Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000004061 bleaching Methods 0.000 description 1
- 238000005119 centrifugation Methods 0.000 description 1
- 239000013064 chemical raw material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010981 drying operation Methods 0.000 description 1
- 230000000887 hydrating effect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 229920005610 lignin Polymers 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D5/00—Sulfates or sulfites of sodium, potassium or alkali metals in general
- C01D5/14—Preparation of sulfites
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D5/00—Sulfates or sulfites of sodium, potassium or alkali metals in general
- C01D5/18—Dehydration
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Inorganic Chemistry (AREA)
- Treating Waste Gases (AREA)
Abstract
A sodium sulfite production method comprises the following steps: the method comprises the following steps: feeding the liquid sulfur and air dried by blast into a sulfur incinerator, and burning the liquid sulfur and the air inside the sulfur incinerator to generate furnace gas of sulfur dioxide; step two: cooling the sulfur dioxide-containing furnace gas by a boiler and an air heat exchanger; step three: washing the flue gas containing sulfur dioxide obtained in the step two to obtain pure sulfur dioxide; step four: absorbing the sulfur dioxide by a three-stage absorption tower to generate a sodium bisulfite solution; step five: pumping the sodium bisulfite solution into a neutralization kettle, and adjusting the pH value; step six: pre-evaporating the sodium sulfite solution, and then evaporating and concentrating; step seven: and centrifuging the concentrated material in a centrifuge, and drying the centrifuged wet material by airflow to obtain the finished anhydrous sodium sulfite. The method for preparing the sodium sulfite by using the caustic soda avoids the discharge of carbon dioxide waste gas generated by absorbing and neutralizing the soda ash, has no discharge of waste water, waste gas and solid waste in the whole production process, is green and environment-friendly, and improves the utilization rate of raw materials.
Description
Technical Field
The invention belongs to the field of sodium sulfite production, and particularly relates to a method for producing sodium sulfite.
Background
The anhydrous sodium sulfite is a white powder solid, is an important chemical raw material, and is widely applied to artificial fiber stabilizers, lignin removing agents in the paper industry, deoxidizing agents in the dye and bleaching industry, oxygen inhibitors in the tanning industry, photographic developers, reductive bleaches and the like.
The existing classical process is to utilize sulfur to burn to generate sulfur dioxide, then the generated sulfur dioxide is absorbed with soda ash and caustic soda to prepare sodium sulfite, and then the finished anhydrous sodium sulfite is obtained through centrifugation and drying.
Disclosure of Invention
The invention provides a sodium sulfite production method, which is used for overcoming the defects in the prior art.
The invention is realized by the following technical scheme:
a sodium sulfite production method comprises the following steps:
the method comprises the following steps: sending the liquid sulfur and air dried by blast into a sulfur incinerator, and burning the liquid sulfur and the air inside to generate furnace gas containing sulfur dioxide at the temperature of 900-;
step two: the furnace gas containing sulfur dioxide at the temperature of 900-950 ℃ is cooled by a boiler and an air heat exchanger to obtain the flue gas containing sulfur dioxide at the temperature of 100-300 ℃;
step three: cooling the flue gas containing sulfur dioxide at the temperature of 100-300 ℃, and removing sulfur trioxide in the flue gas by using a washing solution through a washing tower to obtain pure sulfur dioxide;
step four: absorbing the sulfur dioxide by a three-stage absorption tower to generate a sodium bisulfite solution;
step five: sodium bisulfite solution is pumped into a neutralization kettle, and sodium hydroxide solution is added to adjust the pH value to 11-12;
step six: pre-evaporating the sodium sulfite solution, and then evaporating and concentrating;
step seven: and centrifuging the concentrated material in a centrifuge, and drying the centrifuged wet material by airflow to obtain the finished anhydrous sodium sulfite.
In the method for producing sodium sulfite, the byproduct hot air and steam generated in the second step can be recycled as heat sources.
In the sodium sulfite production method, the washing liquid in the third step is sulfuric acid with the concentration of 93 percent produced in a sulfuric acid plant.
In the sodium sulfite production method, the pH value of the step four is controlled within the range of 3-7.
In the method for producing sodium sulfite, the absorption liquid used by the absorption tower in the fourth step is prepared from mother liquor, sodium hydroxide and water, enters from the top of the third-stage absorption tower, flows out from the bottom, is pumped into the top of the second-stage absorption tower, is pumped into the top of the first-stage absorption tower from the bottom of the second-stage absorption tower, and flows into the circulating kettle from the bottom.
In the method for producing sodium sulfite, sulfur dioxide in the fourth step is absorbed by the first-stage, second-stage and third-stage absorption towers in sequence, tail gas enters the tail gas absorption tower, the 2-stage alkali liquor countercurrent absorption process is adopted for absorption, and absorption liquid is recycled to the neutralization kettle.
In the method for producing sodium sulfite, the flue gas containing sulfur dioxide at the temperature of 300 ℃ at 100 ℃ is used for pre-evaporating the sodium sulfite solution in the sixth step, and the steam generated in the second step is used for concentration and concentration; the temperature of the flue gas containing sulfur dioxide is reduced to 50-55 ℃ through heat exchange with a sodium sulfite solution.
In the method for producing sodium sulfite, steam is used for heating and drying in the seventh step, the generated dry tail gas and tail gas of the absorption tower enter the tail gas absorption kettle together, and the temperature of the inlet and the outlet is strictly controlled.
The invention has the advantages that:
1. the method for preparing the sodium sulfite by using the caustic soda avoids the discharge of carbon dioxide waste gas generated by soda absorption and neutralization, and the absorption tail gas generated by the tertiary absorption tower and the dry tail gas (mainly containing sodium sulfite dust) generated by airflow drying are collected and combined to be absorbed by the tail gas absorption tower, so that the solution is recycled to the neutralization kettle for the neutralization of the sodium sulfite solution, and the whole production process has no discharge of waste water, waste gas and solid waste, is green and environment-friendly, and improves the utilization rate of raw materials.
2. The invention utilizes the waste heat of sulfur dioxide after air heat exchange to pre-evaporate the sodium sulfite solution, and the gas enters the absorption tower after being cooled, thereby improving the concentration, saving time and cost for subsequent steam concentration, fully utilizing energy and avoiding secondary cooling before absorption.
3. The invention utilizes steam to carry out air flow drying, thereby avoiding the influence of dust impurities carried in hot air on the product quality; the temperature of the inlet and the outlet is controlled to prevent the steam from hydrating, and the dry tail gas brought out by the steam does not contain dust mixed in the air, so that the product purity is improved.
4. The by-product hot air can be used in heating or drying operation of other workshops, and the heat can be recycled; besides self-use in workshop, the steam can be sold, and the by-product value is increased.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Examples
The method comprises the following steps: sending the liquid sulfur and air dried by blast into a sulfur incinerator, and burning the liquid sulfur and the air inside to generate furnace gas containing sulfur dioxide at the temperature of 900-;
step two: the furnace gas containing sulfur dioxide at the temperature of 900-950 ℃ is cooled by a boiler and an air heat exchanger to obtain the flue gas containing sulfur dioxide at the temperature of 100-300 ℃;
step three: cooling the flue gas containing sulfur dioxide at the temperature of 100-300 ℃, and washing the cooled flue gas by using sulfuric acid with the concentration of 93 percent produced in a sulfuric acid workshop through a washing tower to remove sulfur trioxide in the flue gas to obtain pure sulfur dioxide;
step four: sulfur dioxide is absorbed by a third-stage absorption tower to generate sodium bisulfite solution, the sulfur dioxide is absorbed by a first-stage, a second-stage and a third-stage absorption tower in sequence, tail gas enters a tail gas absorption tower, a 2-stage alkali liquor countercurrent absorption process is adopted for absorption, absorption liquid is recycled to a neutralization kettle, and the pH value is controlled within the range of 3-7 in the whole process;
step five: sodium bisulfite solution is pumped into a neutralization kettle, and sodium hydroxide solution is added to adjust the pH value to 11-12;
step six: pre-evaporating the sodium sulfite solution by using 100-DEG C flue gas containing sulfur dioxide, concentrating and concentrating by using steam generated in the step two, and reducing the temperature of the flue gas containing sulfur dioxide to 50-55 ℃ through heat exchange with the sodium sulfite solution;
step seven: and (3) centrifuging the concentrated material in a centrifuge, drying the centrifuged wet material by airflow, heating and drying by steam, feeding the generated dry tail gas and tail gas of the absorption tower into a tail gas absorption kettle, and strictly controlling the inlet and outlet temperature in the process to obtain the finished anhydrous sodium sulfite.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. A sodium sulfite production method is characterized in that: the method comprises the following steps:
the method comprises the following steps: sending the liquid sulfur and air dried by blast into a sulfur incinerator, and burning the liquid sulfur and the air inside to generate furnace gas containing sulfur dioxide at the temperature of 900-;
step two: the furnace gas containing sulfur dioxide at the temperature of 900-950 ℃ is cooled by a boiler and an air heat exchanger to obtain the flue gas containing sulfur dioxide at the temperature of 100-300 ℃;
step three: cooling the flue gas containing sulfur dioxide at the temperature of 100-300 ℃, and removing sulfur trioxide in the flue gas by using a washing solution through a washing tower to obtain pure sulfur dioxide;
step four: absorbing the sulfur dioxide by a three-stage absorption tower to generate a sodium bisulfite solution;
step five: sodium bisulfite solution is pumped into a neutralization kettle, and sodium hydroxide solution is added to adjust the pH value to 11-12;
step six: pre-evaporating the sodium sulfite solution, and then evaporating and concentrating;
step seven: and centrifuging the concentrated material in a centrifuge, and drying the centrifuged wet material by airflow to obtain the finished anhydrous sodium sulfite.
2. The method for producing sodium sulfite according to claim 1, characterized in that: the byproduct hot air and steam generated in the second step can be recycled as heat sources.
3. The method for producing sodium sulfite according to claim 1, characterized in that: and the washing liquid in the third step is sulfuric acid with the concentration of 93 percent produced in a sulfuric acid workshop.
4. The method for producing sodium sulfite according to claim 1, characterized in that: the pH value of the step four is controlled within the range of 3-7.
5. The method for producing sodium sulfite according to claim 1, characterized in that: and the absorption liquid used by the absorption tower in the fourth step is prepared from mother liquor, sodium hydroxide and water, enters from the top of the third-stage absorption tower, flows out from the bottom of the third-stage absorption tower, is pumped into the top of the second-stage absorption tower, is pumped into the top of the first-stage absorption tower from the bottom of the second-stage absorption tower, and flows into the circulating kettle from the bottom of the first-stage absorption tower.
6. The method for producing sodium sulfite according to claim 1, characterized in that: and in the fourth step, the tail gas enters a tail gas absorption tower after the sulfur dioxide is absorbed by a first-stage absorption tower, a second-stage absorption tower and a third-stage absorption tower in sequence, a 2-stage alkali liquor countercurrent absorption process is adopted for absorption, and the absorption liquid is recycled to the neutralization kettle.
7. The method for producing sodium sulfite according to claim 1, characterized in that: in the sixth step, the flue gas containing sulfur dioxide at the temperature of 100-; the temperature of the flue gas containing sulfur dioxide is reduced to 50-55 ℃ through heat exchange with a sodium sulfite solution.
8. The method for producing sodium sulfite according to claim 1, characterized in that: and seventhly, heating and drying by using steam, feeding the generated dry tail gas and tail gas of the absorption tower into a tail gas absorption kettle, and strictly controlling the temperature of an inlet and an outlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011032491.XA CN112093811A (en) | 2020-09-27 | 2020-09-27 | Sodium sulfite production method |
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| CN202011032491.XA CN112093811A (en) | 2020-09-27 | 2020-09-27 | Sodium sulfite production method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111841162A (en) * | 2020-07-31 | 2020-10-30 | 南京科技职业学院 | Sulfur dioxide gas treatment device and method |
| CN113979499A (en) * | 2021-11-08 | 2022-01-28 | 四川天人能源科技有限公司 | Process for recycling flue gas of waste water combined boiler |
| CN114162838A (en) * | 2021-12-28 | 2022-03-11 | 淮安市井沅科技有限公司 | Production process of anhydrous sodium sulfate for storage battery |
| CN116605889A (en) * | 2023-04-06 | 2023-08-18 | 天津市佳和食品科技有限公司 | Preparation method of sulfite with high purity |
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| CN102160960A (en) * | 2011-02-25 | 2011-08-24 | 中冶华天工程技术有限公司 | Soda wet desulphurization process and system for sintering flue gas |
| CN104016382A (en) * | 2014-06-27 | 2014-09-03 | 尚兰华 | Method for producing sodium sulfite by desulfurizing flue gas by double-alkali process |
| CN107758697A (en) * | 2017-11-20 | 2018-03-06 | 宣城市楷昂化工有限公司 | A kind of production method of industrial anhydrous sodium sulfite |
| CN110028086A (en) * | 2019-04-12 | 2019-07-19 | 南京汇仁化工设备有限公司 | A kind of method of sulphur gas production anhydrous sodium sulfite |
-
2020
- 2020-09-27 CN CN202011032491.XA patent/CN112093811A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102160960A (en) * | 2011-02-25 | 2011-08-24 | 中冶华天工程技术有限公司 | Soda wet desulphurization process and system for sintering flue gas |
| CN104016382A (en) * | 2014-06-27 | 2014-09-03 | 尚兰华 | Method for producing sodium sulfite by desulfurizing flue gas by double-alkali process |
| CN107758697A (en) * | 2017-11-20 | 2018-03-06 | 宣城市楷昂化工有限公司 | A kind of production method of industrial anhydrous sodium sulfite |
| CN110028086A (en) * | 2019-04-12 | 2019-07-19 | 南京汇仁化工设备有限公司 | A kind of method of sulphur gas production anhydrous sodium sulfite |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111841162A (en) * | 2020-07-31 | 2020-10-30 | 南京科技职业学院 | Sulfur dioxide gas treatment device and method |
| CN113979499A (en) * | 2021-11-08 | 2022-01-28 | 四川天人能源科技有限公司 | Process for recycling flue gas of waste water combined boiler |
| CN114162838A (en) * | 2021-12-28 | 2022-03-11 | 淮安市井沅科技有限公司 | Production process of anhydrous sodium sulfate for storage battery |
| CN116605889A (en) * | 2023-04-06 | 2023-08-18 | 天津市佳和食品科技有限公司 | Preparation method of sulfite with high purity |
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