CN104860335A - Refining method for removing chlorate from salt water - Google Patents
Refining method for removing chlorate from salt water Download PDFInfo
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- CN104860335A CN104860335A CN201510229944.0A CN201510229944A CN104860335A CN 104860335 A CN104860335 A CN 104860335A CN 201510229944 A CN201510229944 A CN 201510229944A CN 104860335 A CN104860335 A CN 104860335A
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- chlorate
- oxymuriate
- salt solution
- sodium pyrosulfite
- salt water
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Abstract
A refining method for removing chlorate from salt water includes adding stoichiometric sodium pyrosulfite solution or solid according to the content of chlorate in salt water to enable the sodium pyrosulfite to have chemical reaction with the chlorate to decompose the cholorate into a compound soluble in water. Other substances in the salt water do not react with the compound, acid generated in reaction is neutralized by alkaline to enable the pH value to be 8-12 and further enable the content of chlorate in the salt water to be smaller than 5 g/l (calculated by sodium chlorate), and the requirements for salt water control index can be met.
Description
Technical field
The present invention relates to the treatment process of salt solution, process relates to a kind of decomposition method removed from salt solution or reduce oxymuriate.
Background technology
The production method of existing chlor-alkali caustic soda adopts the technique of electrolysis with ion-exchange film sodium chloride brine mostly.The continuous decline of producing along with ionic membrane periodic performance of this method there will be the continuous enrichment of salt solution chlorate content and goes up and exceed standard, and can increase the corrosion of hardware because oxymuriate in salt solution exceeds standard and affect resin tower regeneration effect etc.
Tradition is except oxymuriate technique for add a large amount of hydrochloric acid and to heat up with steam in salt solution, hydrochloric acid and oxymuriate generation chemical reaction is made to remove oxymuriate in salt solution under the high temperature conditions, excessive hydrochloric acid neutralizes with alkali again, this traditional technology need consume a large amount of hydrochloric acid, steam and caustic soda on the one hand, and working cost is huge; A large amount of waste chlorine can be produced after reaction on the other hand, cause potential safety hazard, or manufacture clorox, also can consume caustic soda.Clorox output is caused to increase, if dull sale can be forced and be stopped waste gas absorbing system and affect whole chlor-alkali production system.
Summary of the invention
For solving the problems of the technologies described above, the invention provides a kind of decomposition method removing oxymuriate from salt solution, chlorate content in salt solution disposablely can be made to reach the index (being less than 5g/L) of brine process control, meet ionic membrane to brine quality requirement.
A kind of decomposition process for purification removing oxymuriate from salt solution provided by the invention, comprises the following steps:
Electrolyzer light salt brine out enters oxymuriate decomposer, and add Sodium Pyrosulfite wherein, gained acid solution is after dechlorinator, add alkali and regulate pH to 8-12, after light salt brine after dechlorinator's dechlorination is delivered to sulfate radical system, returning salt operation carries out refinement treatment, chlorate content be less than 5g/L qualified after return electrolyzer.
Further, described Sodium Pyrosulfite can be 5%-50% sodium metabisulfite solution for mass concentration, or Sodium Pyrosulfite solid;
Further, the consumption of described Sodium Pyrosulfite is: every cube of salt solution adds more than Sodium Pyrosulfite 1.5Kg; Decompose 1kg oxymuriate in theory and need 2.68kg Sodium Pyrosulfite.
Further, the alkali of pH is regulated to be selected from caustic soda, mass concentration 20% ~ 32%.
The present invention adds stoichiometric sodium metabisulfite solution or solid according to the content of oxymuriate in salt solution, make it, with oxymuriate generation chemical reaction, oxymuriate is resolved into compound soluble in water, in salt solution, other materials then do not react with this compound, after reaction, the acidity of salt solution reduces, neutralize solution ph 8-12 with caustic soda, the content of oxymuriate in salt solution can be made to control, in below 5g/L (in sodium chlorate), to reach the requirement of salt solution Con trolling index.
Its chemical equation is as follows:
3Na
2S
2O
5+2NaCLO
3+3H
2O＝3Na
2SO
4+2NaCL+3H
2SO
4
The side product chlorinated sodium produced is salt solution principal constituent, and the easy-to-use sulfate radical system of sulfate radical is removed.
According to the content of oxymuriate in salt solution, the chlorate content in salt solution can also be controlled by the consumption controlling Sodium Pyrosulfite in actual production.And can accomplish chlorate content in salt solution to be controlled, in lower level, can below 2g/L be reached.Chlorate content in salt solution once can be made to reach the index of brine process control, also can meet ionic membrane to brine quality requirement.
Embodiment
Embodiment 1
From salt solution, remove a process for purification for oxymuriate, comprise the following steps:
Take out electrolyzer light salt brine 5 cubes, wherein chloride hydrochlorate 26g/L (in sodium chlorate), before entering dechlorinator, add Sodium Pyrosulfite 285kg in the solution to make it oxymuriate to be resolved into oxymuriate generation chemical reaction the compound being soluble in salt solution, in salt solution, main component does not then react with this compound, and the acid that reaction produces carries out with the caustic soda of mass concentration 25% pH value 10 neutralizing solution after dechlorinator.After salt solution after dechlorinator's dechlorination being delivered to sulfate radical system, returning salt operation carries out refinement treatment, and detecting wherein chlorate content is 5g/l, and after process, qualified brine recirculation returns electrolyzer.
Reaction process:
5M
3in salt solution, sodium chlorate is from 26g/L, drops to 5g/L, needs decomposition reaction to fall sodium chlorate: (26-5) * 5=105kg, 105*2.68=280kg)
Embodiment 2
From salt solution, remove a process for purification for oxymuriate, comprise the following steps:
Take out groove light salt brine 5 cubes, wherein chloride hydrochlorate 26g/l (in sodium chlorate), before entering oxymuriate decomposer, add Sodium Pyrosulfite 300kg in the solution, make it oxymuriate to be resolved into oxymuriate generation chemical reaction the compound being soluble in salt solution, in salt solution, main component does not then react with this compound, the acid that reaction produces and salt solution enter oxymuriate decomposer and react with oxymuriate further after heating, and reacted salt solution carries out with the caustic soda of mass concentration 30% pH value 10 neutralizing solution after dechlorinator.After salt solution after dechlorinator's dechlorination being delivered to sulfate radical system, returning salt operation carries out refinement treatment, detects wherein chlorate content and is less than 4g/l, and after process, qualified brine recirculation returns electrolyzer.
Reaction process:
5M
3in salt solution, sodium chlorate is from 26g/L, drops to 4g/L, needs decomposition reaction to fall sodium chlorate: (26-4) * 5=110kg, 110*2.68=294kg.
Claims (4)
1. from salt solution, remove a process for purification for oxymuriate, it is characterized in that, described process for purification comprises the following steps:
Electrolyzer light salt brine out enters oxymuriate decomposer, and add Sodium Pyrosulfite wherein, gained acid solution is after dechlorinator, add alkali and regulate pH to 8-12, after light salt brine after dechlorinator's dechlorination is delivered to sulfate radical system, returning salt operation carries out refinement treatment, chlorate content be less than 5g/L qualified after return electrolyzer.
2. process for purification according to claim 1, is characterized in that, described Sodium Pyrosulfite is mass concentration is 5%-50% sodium metabisulfite solution, or Sodium Pyrosulfite solid.
3. process for purification according to claim 1 and 2, is characterized in that, the consumption of described Sodium Pyrosulfite is: every cube of salt solution adds more than Sodium Pyrosulfite 1.5Kg.
4. the process for purification according to any one of claim 1-3, is characterized in that, regulates the alkali of pH to be selected from caustic soda, mass concentration 20% ~ 32%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510229944.0A CN104860335A (en) | 2015-05-07 | 2015-05-07 | Refining method for removing chlorate from salt water |
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| CN201510229944.0A CN104860335A (en) | 2015-05-07 | 2015-05-07 | Refining method for removing chlorate from salt water |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106011928A (en) * | 2016-05-27 | 2016-10-12 | 江苏索普化工股份有限公司 | Chlorate removal method in production of chlor-alkali ionic membrane |
| CN106276816A (en) * | 2016-08-15 | 2017-01-04 | 新疆中泰创安环境科技股份有限公司 | The vacuum dechlorination method of purification of ion film caustic soda by-product dilute sulfuric acid and special purpose device thereof |
| CN107201531A (en) * | 2017-04-27 | 2017-09-26 | 新疆中泰化学阜康能源有限公司 | Highly acid light salt brine reclamation set after chlorate decomposer is decomposed in electrolysis process |
| CN108251860A (en) * | 2018-01-25 | 2018-07-06 | 江苏理文化工有限公司 | Chlorate decomposition technique in a kind of brine |
| CN108325473A (en) * | 2018-01-25 | 2018-07-27 | 江苏理文化工有限公司 | A kind of distintegrant adding set for decomposing chlorate in brine |
| CN112481646A (en) * | 2020-10-27 | 2021-03-12 | 江苏奥喜埃化工有限公司 | Chlorate device is removed to potassium chloride salt water |
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| CN101293661A (en) * | 2008-06-11 | 2008-10-29 | 昊华宇航化工有限责任公司 | Ionic membrane caustic soda light salt brine fine purification technique |
| CN102634813A (en) * | 2012-03-19 | 2012-08-15 | 山东东岳氟硅材料有限公司 | Method for increasing chlorate decomposition efficiency |
| CN202400859U (en) * | 2011-12-27 | 2012-08-29 | 昊华宇航化工有限责任公司 | Chlorate decomposing device |
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| CN101293661A (en) * | 2008-06-11 | 2008-10-29 | 昊华宇航化工有限责任公司 | Ionic membrane caustic soda light salt brine fine purification technique |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106011928A (en) * | 2016-05-27 | 2016-10-12 | 江苏索普化工股份有限公司 | Chlorate removal method in production of chlor-alkali ionic membrane |
| CN106011928B (en) * | 2016-05-27 | 2018-11-02 | 江苏索普化工股份有限公司 | The removal methods of chlorate in Membrane Used In Chlor-alkali Cell production |
| CN106276816A (en) * | 2016-08-15 | 2017-01-04 | 新疆中泰创安环境科技股份有限公司 | The vacuum dechlorination method of purification of ion film caustic soda by-product dilute sulfuric acid and special purpose device thereof |
| CN107201531A (en) * | 2017-04-27 | 2017-09-26 | 新疆中泰化学阜康能源有限公司 | Highly acid light salt brine reclamation set after chlorate decomposer is decomposed in electrolysis process |
| CN107201531B (en) * | 2017-04-27 | 2020-10-30 | 新疆中泰化学阜康能源有限公司 | Strong acid light salt water recycling device after chlorate decomposer decomposes in electrolysis process |
| CN108251860A (en) * | 2018-01-25 | 2018-07-06 | 江苏理文化工有限公司 | Chlorate decomposition technique in a kind of brine |
| CN108325473A (en) * | 2018-01-25 | 2018-07-27 | 江苏理文化工有限公司 | A kind of distintegrant adding set for decomposing chlorate in brine |
| CN108325473B (en) * | 2018-01-25 | 2021-04-02 | 江苏理文化工有限公司 | A decomposition agent interpolation device for decomposing chlorate in salt water |
| CN112481646A (en) * | 2020-10-27 | 2021-03-12 | 江苏奥喜埃化工有限公司 | Chlorate device is removed to potassium chloride salt water |
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