CN108715453A - A kind of process for cleanly preparing of saline and alkaline mixed liquor production sodium pyrosulfite and sodium chloride - Google Patents
A kind of process for cleanly preparing of saline and alkaline mixed liquor production sodium pyrosulfite and sodium chloride Download PDFInfo
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- CN108715453A CN108715453A CN201810727855.2A CN201810727855A CN108715453A CN 108715453 A CN108715453 A CN 108715453A CN 201810727855 A CN201810727855 A CN 201810727855A CN 108715453 A CN108715453 A CN 108715453A
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- Prior art keywords
- mixed liquor
- saline
- sodium
- sodium chloride
- alkaline mixed
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- 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
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D3/00—Halides of sodium, potassium or alkali metals in general
- C01D3/04—Chlorides
- C01D3/06—Preparation by working up brines; seawater or spent lyes
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
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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 kind of process for cleanly preparing of saline and alkaline mixed liquor production sodium pyrosulfite and sodium chloride, belongs to protection of natural resources and environment field in Chemical Manufacture.The technique uses multistage to divide the method for salt, classified utilization in process of production, in mixed waste liquor sodium carbonate and sodium chloride be converted into sodium pyrosulfite and sodium chloride product, realize that effluent resource increment utilizes.This method product quality is high, equipment investment is few, at low cost and discharged without waste water and dregs, belongs to process for cleanly preparing.
Description
Technical field
The present invention relates to the process for cleanly preparing that a kind of saline and alkaline mixed liquor produces sodium pyrosulfite and sodium chloride, belong to chemical industry
Protection of natural resources and environment field in production.
Background technology
Natural alkali mine produces in the haline water of sodium carbonate by-product and the by-product haline water of part Chemical Manufacture, contains
Na2CO3、NaHCO3And the inorganic salts such as NaCl, the only domestic annual by-product saline-alkali composite waste of trona industry is just up to 3,000,000
Ton.This effluent part contains valuable higher sodium carbonate, but due to a large amount of presence of sodium chloride, the cost of evaporation separation salt is too
Height, and product quality also bad control.Some units use injected method, cause alkali ore resources can coefficient of mining decline, often
It loses more than gain.There is no resource utilization process application still now, most of is all to neutralize emission treatment：The cost of neutralization is very high,
And the discharge of haline water returns environment and causes great burden.Therefore recycling work of the exploitation for this complex saline-alkali waste liquid
Skill had not only met the national strategy that China develops a circular economy, but also has had significant economic benefit and environmental benefit.
Invention content
The purpose of the present invention is being directed to environmental problem existing for reality, a kind of saline and alkaline mixed liquor production sodium pyrosulfite is provided
With the process for cleanly preparing of sodium chloride.The technique uses multistage to divide the method for salt, classified utilization in process of production, and mixing is given up
Sodium carbonate and sodium chloride are converted into sodium pyrosulfite and sodium chloride product in liquid, realize that effluent resource increment utilizes.This method
Product quality is high, equipment investment is few, at low cost and discharged without waste water and dregs, belongs to process for cleanly preparing.
To achieve the above object, technical scheme of the present invention：
A kind of process for cleanly preparing of saline and alkaline mixed liquor production sodium pyrosulfite and sodium chloride, its step are as follows：
1) saline and alkaline mixed liquor is heated to 90 DEG C or more, makes the NaHCO in solution3It is converted into Na2CO3, remove part CO2；
2) CO is removed2Saline and alkaline mixed liquor afterwards is evaporated concentration using MVR (mechanical steam recompression)；
3) when mixed solution is concentrated to sodium chloride therein close to saturation, wet product Na is isolated by crystallisation by cooling2CO3Gu
Body；Remaining mother liquor carries out double evaporation-cooling using MVR, evaporates sodium carbonate in liquid and passes through evaporative crystallization close to evaporation is stopped when being saturated
Go out NaCl solids, sodium chloride in mixed liquor is made to realize recycling；
4) sulphur is put into sulfur furnace, the SO generated after burning2The Na isolated with step 32CO3According to known
Technological reaction generate sodium pyrosulfite, realize mixed liquor in alkali recycling；
5) tail gas generated during production sodium pyrosulfite carries out desulfurization process using saline and alkaline mixed liquor and generates Na2SO3It is molten
Liquid and CO2, Na2SO3Solution is recycled for producing sodium pyrosulfite.
" removing part CO in the step 1)2", its purpose is to prevent on-condensible gas ratio during negative pressure evaporation
It is too high, cause vacuum compressor rapids to shake.The standard of decarburization is：CO in total gas when evaporation2Ratio is less than 5%.
The principle of crystallisation by cooling sodium carbonate is in the step 3), and sodium carbonate solubility with temperature changes greatly；Evaporation knot
The principle of brilliant sodium chloride is that sodium chloride solubility with temperature varies less.
" saline and alkaline mixed liquor " can be the saline and alkaline mixed liquor of arbitrary process in system in the step 5), preferably remove chlorine
Change sodium, sodium carbonate does not have an impact sodium pyrosulfite product quality close to the saline and alkaline mixed liquor of saturation.
The beneficial effects of the invention are as follows：In process of production, by saline and alkaline mixed liquor sodium chloride and sodium carbonate segmentation point
From production sodium pyrosulfite and sodium chloride product realize mixed solution recycling；The process makes full use alkali of high value
Resource, production cost are greatly reduced, and while solving environmental pollution, the increment for realizing mixed waste liquor utilizes, economy and ring
Border benefit is apparent.
Description of the drawings
Fig. 1 is present invention process flow chart.
Specific implementation mode
It further illustrates, but is not construed as limiting the invention by the following examples.
Embodiment 1：
Referring to attached drawing 1, the process for cleanly preparing of the present invention saline and alkaline mixed liquor production sodium pyrosulfite and sodium chloride, step
It is as follows：
1) by saline and alkaline mixed liquor 1000kg (wherein containing sodium carbonate 100kg, sodium bicarbonate 30kg, sodium chloride 5kg) heating
To 105 DEG C, by the NaHCO in solution3It is converted into Na2CO3, remove part CO2, until NaHCO in solution3Surplus is less than 5kg；
2) CO is removed2Saline and alkaline mixed liquor afterwards is evaporated concentration using MVR (mechanical steam recompression)；
3) mixed solution is concentrated to sodium chloride therein close to (sodium chloride saturation solubility 35.9g) when saturation, by cold
But solution Crystallization Separation goes out wet product Na2CO3Solid；Remaining mother liquor carries out double evaporation-cooling using MVR, and it is close to evaporate sodium carbonate in liquid
(100 DEG C of saturation solubility 44.7g of sodium carbonate) stop evaporation when saturation, and crystallizing out NaCl solids by circulating and evaporating amounts to
4.2kg makes sodium chloride in mixed liquor realize recycling；
4) sulphur is put into sulfur furnace, the SO generated after burning2The Na isolated with step 32CO3According to known
Technique, reaction generates sodium pyrosulfite, finally obtains 98% sodium pyrosulfite 207kg (wherein sodium chloride-containing 0.8kg), real
The recycling of alkali in existing mixed liquor；
5) tail gas generated during production sodium pyrosulfite carries out desulfurization process using saline and alkaline mixed liquor and generates Na2SO3It is molten
Liquid and CO2, Na2SO3Solution is back to production sodium pyrosulfite.
Embodiment 2：
Referring to attached drawing 1, the process for cleanly preparing of the present invention saline and alkaline mixed liquor production sodium pyrosulfite and sodium chloride, step
It is as follows：
1) saline and alkaline mixed liquor 1000kg (wherein containing sodium carbonate 80kg, sodium bicarbonate 70kg, sodium chloride 6kg) is heated to
115 DEG C, by the NaHCO in solution3It is converted into Na2CO3, remove part CO2, until NaHCO in solution3Surplus is less than 3kg；
2) CO is removed2Saline and alkaline mixed liquor afterwards is evaporated concentration using MVR (mechanical steam recompression)；
3) mixed solution is concentrated to sodium chloride therein close to (sodium chloride saturation solubility 35.9g) when saturation, by cold
But solution Crystallization Separation goes out wet product Na2CO3Solid；Remaining mother liquor carries out double evaporation-cooling using MVR, and it is close to evaporate sodium carbonate in liquid
(100 DEG C of saturation solubility 44.7g of sodium carbonate) stop evaporation when saturation, and crystallizing out NaCl solids by circulating and evaporating amounts to
4.0kg makes sodium chloride in mixed liquor realize recycling；
4) sulphur is put into sulfur furnace, the SO generated after burning2With the Na isolated2CO3According to well known work
Skill, reaction generate sodium pyrosulfite, finally obtain 97% sodium pyrosulfite 215kg (wherein sodium chloride-containing 2.0kg), realize mixed
Close the recycling of alkali in liquid；
5) tail gas generated during production sodium pyrosulfite carries out desulfurization process using saline and alkaline mixed liquor and generates Na2SO3It is molten
Liquid and CO2, Na2SO3Solution is back to production sodium pyrosulfite.
The above embodiments merely illustrate the technical concept and features of the present invention, and its object is to allow person skilled in the art
Scholar cans understand the content of the present invention and implement it accordingly, and it is not intended to limit the scope of the present invention.It is all according to the present invention
Equivalent change or modification made by Spirit Essence, should be covered by the protection scope of the present invention.
Claims (5)
1. a kind of process for cleanly preparing of saline and alkaline mixed liquor production sodium pyrosulfite and sodium chloride, its step are as follows：
1) saline and alkaline mixed liquor is heated to 90 DEG C or more, makes the NaHCO in solution3It is converted into Na2CO3, remove part CO2；
2) CO is removed2Saline and alkaline mixed liquor afterwards is evaporated concentration using MVR (mechanical steam recompression)；
3) when mixed solution is concentrated to sodium chloride sodium therein close to saturation, wet product Na is isolated by crystallisation by cooling2CO3Solid；
Remaining mother liquor carries out double evaporation-cooling using MVR, evaporates sodium carbonate in liquid and is gone out close to evaporation is stopped when being saturated by evaporative crystallization
NaCl solids make sodium chloride in mixed liquor realize recycling；
4) sulphur is put into sulfur furnace, the SO generated after burning2The Na isolated with step 32CO3According to well known work
Skill, reaction generate sodium pyrosulfite, realize the recycling of alkali in mixed liquor；
5) tail gas generated during production sodium pyrosulfite carries out desulfurization process using saline and alkaline mixed liquor and generates Na2SO3Solution and
CO2, Na2SO3Solution is recycled for producing sodium pyrosulfite.
2. the process for cleanly preparing of saline and alkaline mixed liquor production sodium pyrosulfite and sodium chloride according to claim 1, special
Sign is：Part CO is removed in step 1)2, standard be：CO in total gas when evaporation2Ratio is less than 5%.
3. the process for cleanly preparing of saline and alkaline mixed liquor production sodium pyrosulfite and sodium chloride according to claim 1, special
Sign is：Saline and alkaline mixed liquor can be the saline and alkaline mixed liquor of arbitrary process in system in step 5).
4. the process for cleanly preparing of saline and alkaline mixed liquor production sodium pyrosulfite and sodium chloride according to claim 3, special
Sign is：The saline and alkaline mixed liquor is removing superchlorination sodium, saline and alkaline mixed liquor of the sodium carbonate close to saturation.
5. producing the clean manufacturing work of sodium pyrosulfite and sodium chloride according to the saline and alkaline mixed liquor of claim 1-4 any one of them
Skill, it is characterized in that：Saline and alkaline mixed liquor contains sodium carbonate, sodium bicarbonate, sodium chloride.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810727855.2A CN108715453A (en) | 2018-07-05 | 2018-07-05 | A kind of process for cleanly preparing of saline and alkaline mixed liquor production sodium pyrosulfite and sodium chloride |
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| CN201810727855.2A CN108715453A (en) | 2018-07-05 | 2018-07-05 | A kind of process for cleanly preparing of saline and alkaline mixed liquor production sodium pyrosulfite and sodium chloride |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110759360A (en) * | 2019-11-27 | 2020-02-07 | 天津理工大学 | Method and system for producing sodium carbonate, sodium bicarbonate and sodium chloride by evaporating natural alkali liquor |
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|---|---|---|---|---|
| US4219396A (en) * | 1979-08-03 | 1980-08-26 | Allied Chemical Corporation | Electrodialytic process |
| US20050220687A1 (en) * | 2004-03-31 | 2005-10-06 | University Of Utah. | Purification of trona ores |
| CN102775330A (en) * | 2012-07-24 | 2012-11-14 | 杭州海虹精细化工有限公司 | Recycling method of byproduct saline during preparation of hydrazine hydrate by using urea method |
| CN102806013A (en) * | 2012-05-04 | 2012-12-05 | 北京化工大学 | Method for desalting waste liquid generated during production of soda ash by using nanofiltration membrane device |
| CN102887533A (en) * | 2012-09-28 | 2013-01-23 | 天津中科化工有限公司 | Method for producing anhydrous Na2SO3 by using alkali-containing waste mother liquor |
| CN106865571A (en) * | 2017-03-20 | 2017-06-20 | 科莱环境工程（北京）有限公司 | A kind of method that chemical industry strong brine produces sodium bicarbonate and ammonium sulfate |
-
2018
- 2018-07-05 CN CN201810727855.2A patent/CN108715453A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4219396A (en) * | 1979-08-03 | 1980-08-26 | Allied Chemical Corporation | Electrodialytic process |
| US20050220687A1 (en) * | 2004-03-31 | 2005-10-06 | University Of Utah. | Purification of trona ores |
| CN102806013A (en) * | 2012-05-04 | 2012-12-05 | 北京化工大学 | Method for desalting waste liquid generated during production of soda ash by using nanofiltration membrane device |
| CN102775330A (en) * | 2012-07-24 | 2012-11-14 | 杭州海虹精细化工有限公司 | Recycling method of byproduct saline during preparation of hydrazine hydrate by using urea method |
| CN102887533A (en) * | 2012-09-28 | 2013-01-23 | 天津中科化工有限公司 | Method for producing anhydrous Na2SO3 by using alkali-containing waste mother liquor |
| CN106865571A (en) * | 2017-03-20 | 2017-06-20 | 科莱环境工程（北京）有限公司 | A kind of method that chemical industry strong brine produces sodium bicarbonate and ammonium sulfate |
Non-Patent Citations (3)
| Title |
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| 宣叔衡: "浅论天然碱卤水制纯碱中盐碱的分离方法", 《化工设计》 * |
| 杨伟等: "变温蒸发法加工盐碱矿的理论分析", 《纯碱工业》 * |
| 韩长日等: "《精细无机化学品制造技术》", 31 December 2008, 科学技术文献出版社 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110759360A (en) * | 2019-11-27 | 2020-02-07 | 天津理工大学 | Method and system for producing sodium carbonate, sodium bicarbonate and sodium chloride by evaporating natural alkali liquor |
| CN110759360B (en) * | 2019-11-27 | 2023-12-01 | 天津理工大学 | Method and system for producing sodium carbonate, sodium bicarbonate and sodium chloride by evaporating natural alkali liquor |
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Application publication date: 20181030 |