CN114516694B - A waste acid treatment process for co-producing sodium metabisulfite - Google Patents
A waste acid treatment process for co-producing sodium metabisulfite Download PDFInfo
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- CN114516694B CN114516694B CN202011304301.5A CN202011304301A CN114516694B CN 114516694 B CN114516694 B CN 114516694B CN 202011304301 A CN202011304301 A CN 202011304301A CN 114516694 B CN114516694 B CN 114516694B
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- waste acid
- sodium metabisulfite
- sodium
- tail gas
- sodium sulfite
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- 239000002699 waste material Substances 0.000 title claims abstract description 59
- HRZFUMHJMZEROT-UHFFFAOYSA-L sodium disulfite Chemical compound [Na+].[Na+].[O-]S(=O)S([O-])(=O)=O HRZFUMHJMZEROT-UHFFFAOYSA-L 0.000 title claims abstract description 46
- 229940001584 sodium metabisulfite Drugs 0.000 title claims abstract description 46
- 235000010262 sodium metabisulphite Nutrition 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000010306 acid treatment Methods 0.000 title claims abstract description 14
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 claims abstract description 68
- 239000002253 acid Substances 0.000 claims abstract description 57
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 claims abstract description 44
- 235000010265 sodium sulphite Nutrition 0.000 claims abstract description 34
- 238000010521 absorption reaction Methods 0.000 claims abstract description 25
- 238000004519 manufacturing process Methods 0.000 claims abstract description 17
- 238000001035 drying Methods 0.000 claims abstract description 14
- 238000004806 packaging method and process Methods 0.000 claims abstract description 14
- 239000003513 alkali Substances 0.000 claims abstract description 8
- 238000004065 wastewater treatment Methods 0.000 claims abstract description 8
- 238000000926 separation method Methods 0.000 claims abstract description 7
- 229920006395 saturated elastomer Polymers 0.000 claims abstract description 4
- 239000007789 gas Substances 0.000 claims description 36
- 239000000243 solution Substances 0.000 claims description 22
- 239000012452 mother liquor Substances 0.000 claims description 13
- 239000010919 dye waste Substances 0.000 claims description 10
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 9
- 239000007787 solid Substances 0.000 claims description 9
- 238000002386 leaching Methods 0.000 claims description 6
- 239000002912 waste gas Substances 0.000 claims description 6
- 239000012670 alkaline solution Substances 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 4
- 230000003472 neutralizing effect Effects 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000002425 crystallisation Methods 0.000 claims description 2
- 230000008025 crystallization Effects 0.000 claims description 2
- 239000002994 raw material Substances 0.000 abstract description 8
- VBEGHXKAFSLLGE-UHFFFAOYSA-N n-phenylnitramide Chemical compound [O-][N+](=O)NC1=CC=CC=C1 VBEGHXKAFSLLGE-UHFFFAOYSA-N 0.000 abstract description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 7
- 239000007788 liquid Substances 0.000 description 7
- 239000011593 sulfur Substances 0.000 description 7
- 229910052717 sulfur Inorganic materials 0.000 description 7
- 239000000975 dye Substances 0.000 description 4
- 239000010413 mother solution Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- DWAQJAXMDSEUJJ-UHFFFAOYSA-M Sodium bisulfite Chemical compound [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005119 centrifugation Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000543 intermediate Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003541 multi-stage reaction Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000011112 process operation Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 description 1
- 239000004289 sodium hydrogen sulphite Substances 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1456—Removing acid components
- B01D53/1481—Removing sulfur dioxide or sulfur trioxide
-
- 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
- C01D5/145—Pyrosulfites or metabisulfites
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/30—Nature of the water, waste water, sewage or sludge to be treated from the textile industry
-
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Water Supply & Treatment (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- General Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Materials Engineering (AREA)
- Treating Waste Gases (AREA)
- Gas Separation By Absorption (AREA)
Abstract
The invention relates to the technical field of nitroaniline wastewater treatment, and discloses a waste acid treatment process for co-producing sodium metabisulfite, which comprises the following steps of (1) waste acid stripping, (2) absorption reaction, (3) centrifugal separation, (4) drying and packaging, and (5) tail gas treatment, wherein alkali liquor for absorbing tail gas in the step (5) is mixed into sodium sulfite solution for absorbing sulfur dioxide in the step (2) after being saturated, waste acid generated in the dye production process is used as a raw material for producing sodium metabisulfite, and after the waste acid passes through a sodium metabisulfite production section, the waste acid can be directly conveyed into a subsequent wastewater treatment section.
Description
Technical Field
The invention relates to the technical field of nitroaniline wastewater treatment, in particular to a waste acid treatment process for co-producing sodium metabisulfite.
Background
Acid is an important raw material in the dye industry, and a large amount of waste acid is generated in the production process of various dyes and intermediates. The existing waste acid treatment process generally needs to be pretreated before entering a waste water device to neutralize the acid to be neutral, and a large amount of alkali is consumed in the process, so that the treatment cost of the waste acid is increased.
The prior process for producing sodium metabisulfite generally adopts a specific method that firstly, the sulfur is crushed into powder, the powder is sent to a combustion furnace by compressed air, spontaneous combustion is carried out at 600-800 ℃ to obtain gas with SO2 concentration of 10-13%, the gas is introduced into a multi-stage reaction kettle to react with liquid alkali, when the content of sodium bisulphite in the solution reaches the saturation concentration, sodium foot sulfate is crystallized and separated out, and the sodium metabisulfite product is obtained by centrifugation, drying and packaging. The production process of the traditional sodium metabisulfite needs to take sulfur or sulfur ore as a raw material, and the production process taking waste acid as the raw material is not reported.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide a waste acid treatment process for co-producing sodium metabisulfite, the process takes waste acid generated in the dye production process as a raw material for producing sodium metabisulfite, and the waste acid can be directly sent to a subsequent waste water treatment process after the waste acid passes through a sodium metabisulfite production process section.
In order to achieve the above object, the present invention provides the following technical solutions:
a waste acid treatment process for co-producing sodium metabisulfite comprises the following steps:
(1) The method comprises the steps of stripping waste acid, namely conveying dye waste acid, mother liquor of an absorption section and sodium sulfite solid into a waste acid stripping device, wherein the waste acid stripping device is a stripping tower, a mixture of the waste acid, the mother liquor of the absorption section and sodium sulfite enters the stripping tower from the top of the tower, the waste acid reacts with the sodium sulfite to generate sulfur dioxide, hot air is introduced into the bottom of the stripping tower, the liquid is in reverse contact with the air, sulfur dioxide separated from the liquid enters an absorption reaction device along with the air, the waste acid in the liquid phase is neutralized through the reaction with the sodium sulfite, the neutralized waste acid flows out from the bottom of the stripping tower to obtain gas containing sulfur dioxide and neutralized waste acid, and the neutralized waste acid enters other waste water treatment devices for treatment;
(2) The absorption reaction is that the gas containing sulfur dioxide obtained in the step (1) is introduced into sodium sulfite solution for absorption, tail gas is sent to a tail gas treatment working section, sodium metabisulfite is separated out by crystallization of the sodium sulfite solution, and mother liquor containing sodium metabisulfite leaching is sent to a centrifugal separation working section;
(3) Centrifuging the mother liquor containing sodium metabisulfite leaching obtained in the step (2), separating to obtain sodium metabisulfite, conveying the sodium metabisulfite to a drying packaging workshop, and conveying the mother liquor to a waste acid stripping workshop for continuously neutralizing waste acid or mixing sodium sulfite solution for absorbing sulfur dioxide;
(4) Drying and packaging, namely drying and packaging the wet sodium metabisulfite product obtained by the separation in the step (3) to obtain a product, and sending the generated waste gas into a tail gas treatment section;
(5) And tail gas treatment, namely introducing the waste gas from the absorption reaction working section and the drying and packaging working section into a spraying alkali liquor into a tail gas absorption device for tail gas absorption treatment.
Preferably, the alkaline solution absorbing the tail gas in the step (5) is mixed into the sodium sulfite solution used for absorbing sulfur dioxide in the step (2) after being saturated, so that the reutilization of the alkaline solution is realized.
Preferably, the alkaline solution absorbing the tail gas in the step (5) is sodium hydroxide solution with the molar concentration of 10% -30%.
The dye waste acid is preferably dye waste acid with the acidity of 7%, and the mass ratio of the dye waste acid added in the step (1) to the mother liquor of the absorption section to the sodium sulfite solid is 30:10:1.
Preferably, the sodium sulfite solution in the step (2) is prepared from sodium sulfite solid and desalted water, and the molar concentration of the sodium sulfite solution is 20-40%.
Compared with the prior art, the invention has the beneficial effects that:
The process uses the waste acid generated in the dye production process as the raw material for producing the sodium metabisulfite, and the waste acid is neutralized after passing through the sodium metabisulfite production section and can be directly sent to the subsequent wastewater treatment section.
The invention uses waste acid as raw material, the generated sulfur dioxide gas does not contain dust like the sulfur dioxide gas generated by burning sulfur and sulfur ore, thus avoiding the gas washing process required in the traditional production flow, shortening the sodium metabisulfite technological flow and reducing the operation workload.
Drawings
FIG. 1 is a flow chart of the waste acid treatment process for co-producing sodium metabisulfite.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1:
a waste acid treatment process for co-producing sodium metabisulfite comprises the following steps:
(1) The method comprises the steps of stripping waste acid, namely conveying dye waste acid with the acidity of 7% to an absorption section mother solution and sodium sulfite solid into a stripping tower according to the mass ratio of 30:10:1, enabling a mixture of the waste acid, the absorption section mother solution and sodium sulfite to enter the stripping tower from the top of the stripping tower, enabling the waste acid to react with the sodium sulfite to generate sulfur dioxide, enabling hot air to be introduced into the bottom of the stripping tower, enabling the sulfur dioxide resolved from the liquid to enter an absorption reaction device along with the air, enabling the waste acid in the liquid phase to be neutralized through the reaction with the sodium sulfite, enabling the neutralized waste acid to flow out from the bottom of the stripping tower, obtaining gas containing sulfur dioxide and neutralized waste acid, and enabling the neutralized waste acid to enter other wastewater treatment devices for treatment;
(2) The absorption reaction is that the gas containing sulfur dioxide obtained in the step (1) is introduced into a sodium sulfite solution prepared by sodium sulfite solid and desalted water for absorption, the molar concentration of the sodium sulfite solution is 20-40%, the tail gas is sent to a tail gas treatment working section, sodium sulfite solution is crystallized to separate out sodium metabisulfite, and the mother solution containing sodium metabisulfite leaching is sent to a centrifugal separation working section;
(3) Centrifuging the mother liquor containing sodium metabisulfite leaching obtained in the step (2), separating to obtain sodium metabisulfite, conveying the sodium metabisulfite to a drying packaging workshop, and conveying the mother liquor to a waste acid stripping workshop for continuously neutralizing waste acid or mixing sodium sulfite solution for absorbing sulfur dioxide;
(4) Drying and packaging, namely drying and packaging the wet sodium metabisulfite product obtained by the separation in the step (3) to obtain a product, and sending the generated waste gas into a tail gas treatment section;
(5) And (3) tail gas treatment, namely introducing the waste gas from the absorption reaction working section and the drying and packaging working section into a tail gas absorption device to carry out tail gas absorption treatment by spraying sodium hydroxide solution with the molar concentration of 10% -30%, and mixing the saturated alkali liquid into the sodium sulfite solution used for absorbing sulfur dioxide in the step (2), thereby realizing the reutilization of the alkali liquid.
In the method, 1400kg of dye waste acid with the acidity of 7% is consumed, 450kg of sodium sulfite solid is consumed for carrying out the process operation, 346kg of sodium metabisulfite product with the purity of 95% is finally obtained, the acidity of the neutralized waste acid is reduced to 1%, the waste acid is neutralized, the treatment cost of the waste acid is reduced, and the effect of resource saving is achieved;
By using the process of the invention, the consumption of 30% liquid alkali can be reduced by 190kg per 1000kg sodium sulfite, 247kg sodium metabisulfite can be produced, the operation cost is removed, and the economic benefit of 216 yuan can be produced, and the waste acid treatment cost can be saved by 1.8 billion yuan assuming that the process of the invention replaces the 20 ten thousand ton sodium metabisulfite market.
Meanwhile, the waste acid raw material is used, and generated sulfur dioxide gas does not contain dust like sulfur dioxide gas generated by burning sulfur and sulfur ore, so that the gas washing process required in the traditional production flow is avoided, the sodium metabisulfite process flow is shortened, and the operation workload is reduced.
The foregoing description is directed to the preferred embodiments of the present invention, but the embodiments are not intended to limit the scope of the invention, and all equivalent changes or modifications made under the technical spirit of the present invention should be construed to fall within the scope of the present invention.
Claims (6)
1. The waste acid treatment process for co-producing sodium metabisulfite is characterized by comprising the following steps of:
(1) Waste acid stripping, namely conveying dye waste acid, mother liquor of an absorption section and sodium sulfite solid into a waste acid stripping device, stripping by using air to obtain gas containing sulfur dioxide and neutralized waste acid, and treating the neutralized waste acid in other wastewater treatment devices;
(2) The absorption reaction is that the gas containing sulfur dioxide obtained in the step (1) is introduced into sodium sulfite solution for absorption, tail gas is sent to a tail gas treatment working section, sodium metabisulfite is separated out by crystallization of the sodium sulfite solution, and mother liquor containing sodium metabisulfite leaching is sent to a centrifugal separation working section;
(3) Centrifuging the mother liquor containing sodium metabisulfite leaching obtained in the step (2), separating to obtain sodium metabisulfite, conveying the sodium metabisulfite to a drying packaging workshop, and conveying the mother liquor to a waste acid stripping workshop for continuously neutralizing waste acid or mixing sodium sulfite solution for absorbing sulfur dioxide;
(4) Drying and packaging, namely drying and packaging the wet sodium metabisulfite product obtained by the separation in the step (3) to obtain a product, and sending the generated waste gas into a tail gas treatment section;
(5) And tail gas treatment, namely introducing the waste gas from the absorption reaction working section and the drying and packaging working section into a spraying alkali liquor into a tail gas absorption device for tail gas absorption treatment.
2. The waste acid treatment process for co-production of sodium metabisulfite as claimed in claim 1, wherein the alkaline solution absorbing tail gas in the step (5) is mixed into the sodium sulfite solution for absorbing sulfur dioxide in the step (2) after being saturated.
3. The waste acid treatment process for co-production of sodium metabisulfite as claimed in claim 2, wherein the alkaline solution absorbing tail gas in the step (5) is 10% -30% sodium hydroxide solution in molar concentration.
4. The process for treating waste acid for co-production of sodium metabisulfite as claimed in claim 1, wherein the dye waste acid is dye waste acid with an acidity of 7%.
5. The waste acid treatment process for co-production of sodium metabisulfite, which is characterized in that the mass ratio of dye waste acid added in the step (1) to mother liquor of an absorption section to sodium sulfite solid is 30:10:1.
6. The process for treating waste acid generated in co-production of sodium metabisulfite as claimed in claim 1, wherein the sodium sulfite solution in the step (2) is prepared from sodium sulfite solid and desalted water, and the molar concentration of the sodium sulfite solution is 20-40%.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011304301.5A CN114516694B (en) | 2020-11-19 | 2020-11-19 | A waste acid treatment process for co-producing sodium metabisulfite |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011304301.5A CN114516694B (en) | 2020-11-19 | 2020-11-19 | A waste acid treatment process for co-producing sodium metabisulfite |
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| CN114516694A CN114516694A (en) | 2022-05-20 |
| CN114516694B true CN114516694B (en) | 2025-02-18 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107089671A (en) * | 2016-02-18 | 2017-08-25 | 金昌正旭工贸有限责任公司 | A kind of wet process technique of sodium pyrosulfite |
| CN109626696A (en) * | 2019-01-29 | 2019-04-16 | 连云港清泰化工有限公司 | A kind of recovery processing technique of vulcanized sodium and sodium sulfite composite waste |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1567956A1 (en) * | 1967-08-16 | 1970-10-01 | Bayer Ag | Continuous production of anhydrous sodium sulfite |
| CN105293533A (en) * | 2015-11-20 | 2016-02-03 | 潜江永安药业股份有限公司 | Pure oxygen production method of sodium pyrosulfite |
| CN105293534A (en) * | 2015-12-03 | 2016-02-03 | 攀枝花钢企欣宇化工有限公司 | Method for producing sodium sulfite solution by using sulfur dioxide gas |
| RU2641044C1 (en) * | 2017-01-09 | 2018-01-15 | Акционерное общество "Самаранефтегаз" | Acidising composition for bottomhole formation zone |
| CN109607575A (en) * | 2018-01-25 | 2019-04-12 | 朱华东 | A method of sodium pyrosulfite is produced using coking desulfurization waste liquor and thick sulphur |
| CN109052433A (en) * | 2018-11-07 | 2018-12-21 | 宁波中科远东催化工程技术有限公司 | The production technology of sodium pyrosulfite |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107089671A (en) * | 2016-02-18 | 2017-08-25 | 金昌正旭工贸有限责任公司 | A kind of wet process technique of sodium pyrosulfite |
| CN109626696A (en) * | 2019-01-29 | 2019-04-16 | 连云港清泰化工有限公司 | A kind of recovery processing technique of vulcanized sodium and sodium sulfite composite waste |
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