CN104891450A - Method for removing free chlorine in dilute sulfuric acid - Google Patents
Method for removing free chlorine in dilute sulfuric acid Download PDFInfo
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- CN104891450A CN104891450A CN201510280005.9A CN201510280005A CN104891450A CN 104891450 A CN104891450 A CN 104891450A CN 201510280005 A CN201510280005 A CN 201510280005A CN 104891450 A CN104891450 A CN 104891450A
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- Prior art keywords
- sulphuric acid
- dilute sulphuric
- chlorine
- dechlorination
- free chlorine
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Abstract
The invention discloses a method for removing free chlorine in dilute sulfuric acid, which comprises the following steps: removing chlorine by circularly blowing air (or nitrogen) to lower most chlorine dissolved in dilute sulfuric acid; and completely removing the free chlorine in the dilute sulfuric acid by using sodium sulfite as a chlorine remover. The treatment technique is simple and feasible, and is convenient to operate. The method can enhance the quality of the dilute sulfuric acid, is beneficial to the use of the downstream customers, and has important meanings for environmental protection.
Description
Technical field
The present invention relates to chemical field, be specifically related to a kind of method removing dilute sulphuric acid free chlorine.
Background technology
Sulfuric acid is a kind of important industrial chemicals, is widely used in each industrial sectors such as chemistry, oil, iron and steel, nonferrous metallurgy, nuclear power, in modern industry is produced, have important effect.Along with developing rapidly of these industry, sulfuric acid consumption increases year by year, thus the quantity discharged of dilute sulphuric acid also increases thereupon, and the recycling of dilute sulphuric acid, is not only conducive to environment protection, to the Appropriate application of resource, also has very important meaning and function.
In chlor-alkali production process, electrolyzer chlorine temperature is out high, and water content is large, has to pass through cooling and drying treatment, just delivers to follow-up hydrogen chloride synthesis and liquid chlorine section by compressor.Drying treatment uses 98% vitriol oil to carry out drying to moist chlorine usually, after the vitriol oil absorbs the moisture in chlorine, concentration reduces gradually, just can not meet require that of dry chlorine time when about concentration dilution to 75%, sulfuric acid now just becomes dilute sulphuric acid, cannot continue to use.
At present, the dilute sulphuric acid that most domestic chlor-alkali plant produces mostly processes with the form of export trade, and owing to containing a large amount of free chlorines in the dilute sulphuric acid that chlor-alkali enterprises produces, corrodibility is strong, higher to the requirement of equipment material, and intense stimulus smell makes downstream client " keep someone at a respectful distance ".If eliminate chlorine in dilute sulphuric acid, the quality of dilute sulphuric acid is just improved, and such dilute sulphuric acid is turned waste into wealth, and can recycle, or as rust cleaning purposes, or manufacture downstream potash fertilizer, phosphate fertilizer product.Dilute sulphuric acid storage tank finite capacity, in order to discharge storage tank capacity, sale dilute sulphuric acid of paying out of one's own pocket also happens occasionally.How to remove dilute sulphuric acid free chlorine, be turn loss into gain matter of utmost importance.
Summary of the invention
For solving the problems of the technologies described above, the invention provides a kind of method removing dilute sulphuric acid free chlorine, method is simple, can thoroughly remove diluted acid free chlorine.
A kind of method removing dilute sulphuric acid free chlorine provided by the invention, comprises the following steps:
(1), by the dilute sulphuric acid from chlor-alkali chlorine hydrogen drying section, the compressed air of the drying that dechlorination recycle column top spray enters with dechlorination recycle column bottom is squeezed into pump or reverse contact of nitrogen removes chlorine, circulation blowing;
(2) dilute sulphuric acid, in step (1) after dechlorination, with being pumped into filtration cycle groove, adds antichlor in filtration cycle groove, and continuous circulation dilute sulphuric acid cycle index 10 ~ 20 times, remove diluted acid free chlorine.
In step (1), the flow of dilute sulphuric acid and the throughput ratio of compressed air or nitrogen are 4:1.
Further, in step (1), dilute sulphuric acid is 8m from dechlorination recycle column top spray flow
3/ h, dry compressed air or the flow 2m of nitrogen
3/ h.
The number of times of circulation blowing in step (1) 10 ~ 20 times.
Further, squeeze into dechlorination recycle column top after first dilute sulphuric acid can being squeezed into dilute sulphuric acid storage tank in step (1) again, carry out dechlorination circulation.
Further, the chlorine removed in step (1) enters and is absorbed into tower, utilizes caustic soda to absorb and generates clorox.
Described in step (2), antichlor is selected from Na
2sO
3powder or Na
2sO
3saturated solution.
In step (2), dilute sulphuric acid per ton adds 0.8 ~ 1kg Na
2sO
3.
Step (2) sulfite sodium removes dilute sulphuric acid free chlorine,
Chemical equation: Cl
2+ Na
2sO
3+ H
2o=Na
2sO
4+ 2HCl;
S-WAT is excessive: Na
2sO
3+ H
2sO
4=Na
2sO
4+ H
2o+SO
2↑
The present invention makes the chlorine dissolved in dilute sulphuric acid blow down out after first utilizing compressed air (or nitrogen) circulation to blow down dechlorination, makes the chlorine dissolved in dilute sulphuric acid reduce a part; , the chlorine content reduced in dilute sulphuric acid reaches less than 0.05%, then uses S-WAT as antichlor, can remove the free chlorine in dilute sulphuric acid completely.Present treatment technique simple possible, easy to operate, adopt this method, greatly can reduce diluted acid storage tank load, significant to environmental protection, the company of can be increases certain income, for the concentrating and impurity removing that dilute sulphuric acid is follow-up provides basis.
Accompanying drawing explanation
Fig. 1 is dilute sulphuric acid dechlorination schema.
Embodiment
Embodiment 1
Remove a method for dilute sulphuric acid free chlorine, comprise the following steps:
(1), by the dilute sulphuric acid 8m from chlor-alkali chlorine hydrogen drying section
3/ h, squeezes into dechlorination recycle column top spray with pump or squeezes into dechlorination recycle column top spray after squeezing into dilute sulphuric acid storage tank with pump again, the compressed air 2m entered with dechlorination recycle column bottom
3the reverse contact of/h removes chlorine, and the chlorine removed enters and is absorbed into tower, utilizes caustic soda to absorb and generates clorox;
(2) the dilute sulphuric acid 11m, in step (1) after dechlorination
3, the content of its free chlorine, at about 20Kg, with being pumped into filtration cycle groove, adds antichlor Na in filtration cycle groove
2sO
328Kg, and constantly circulation dilute sulphuric acid 10 ~ 20 circulations, remove diluted acid free chlorine, after process, detecting free chlorine contents is 0.03%.
Embodiment 2
Remove a method for dilute sulphuric acid free chlorine, comprise the following steps:
(1), by the dilute sulphuric acid 8m from chlor-alkali chlorine hydrogen drying section
3/ h, squeezes into dechlorination recycle column top spray with pump or squeezes into dechlorination recycle column top spray after squeezing into dilute sulphuric acid storage tank with pump again, entering drying nitrogen 2m with dechlorination recycle column bottom
3the reverse contact of/h removes chlorine, and the chlorine removed enters and is absorbed into tower, utilizes caustic soda to absorb and generates clorox;
(2) the dilute sulphuric acid 11m, in step (1) after dechlorination
3, the content of its free chlorine, at about 20Kg, with being pumped into filtration cycle groove, adds antichlor Na in filtration cycle groove
2sO
335Kg, and constantly circulation dilute sulphuric acid 10 ~ 20 circulations, remove diluted acid free chlorine, after process, can't detect free chlorine.
Claims (8)
1. remove a method for dilute sulphuric acid free chlorine, it is characterized in that, said method comprising the steps of:
(1), by the dilute sulphuric acid from chlor-alkali chlorine hydrogen drying section, the compressed air of the drying that dechlorination recycle column top spray enters with dechlorination recycle column bottom is squeezed into pump or reverse contact of nitrogen removes chlorine, circulation blowing;
(2) dilute sulphuric acid, in step (1) after dechlorination, with being pumped into filtration cycle groove, adds antichlor in filtration cycle groove, and continuous circulation dilute sulphuric acid cycle index 10 ~ 20 times, remove diluted acid free chlorine.
2. method according to claim 1, is characterized in that, in step (1), the flow of dilute sulphuric acid and the throughput ratio of compressed air or nitrogen are 4:1.
3. method according to claim 1 and 2, is characterized in that, in step (1), dilute sulphuric acid is 8m from dechlorination recycle column top spray flow
3/ h, dry compressed air or the flow 2m of nitrogen
3/ h.
4. method according to claim 1, is characterized in that, the number of times of circulation blowing in step (1) 10 ~ 20 times.
5. the method according to any one of claim 1-4, is characterized in that, squeezes into dechlorination recycle column top again, carry out dechlorination circulation in step (1) after first dilute sulphuric acid being squeezed into dilute sulphuric acid storage tank.
6. method according to claim 5, is characterized in that, the chlorine removed in step (1) enters and is absorbed into tower, utilizes caustic soda to absorb and generates clorox.
7. method according to claim 1, is characterized in that, described in step (2), antichlor is selected from Na
2sO
3powder or Na
2sO
3saturated solution.
8. method according to claim 7, is characterized in that, in step (2), dilute sulphuric acid per ton adds 0.8 ~ 1kg Na
2sO
3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510280005.9A CN104891450A (en) | 2015-05-27 | 2015-05-27 | Method for removing free chlorine in dilute sulfuric acid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510280005.9A CN104891450A (en) | 2015-05-27 | 2015-05-27 | Method for removing free chlorine in dilute sulfuric acid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104891450A true CN104891450A (en) | 2015-09-09 |
Family
ID=54024490
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510280005.9A Pending CN104891450A (en) | 2015-05-27 | 2015-05-27 | Method for removing free chlorine in dilute sulfuric acid |
Country Status (1)
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|---|---|
| CN (1) | CN104891450A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106044723A (en) * | 2016-05-31 | 2016-10-26 | 安徽八化工股份有限公司 | Method for removing free chlorine in waste sulfuric acid produced in chlorine drying process |
| 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 |
| CN106517104A (en) * | 2016-12-13 | 2017-03-22 | 攀枝花钢企欣宇化工有限公司 | Method for removing free chlorines from waste industrial sulfuric acid |
| CN108786378A (en) * | 2018-07-10 | 2018-11-13 | 四川永祥股份有限公司 | A kind of sulfuric acid cycle dechlorinator, dechlorination system and dechlorination method |
| CN110294461A (en) * | 2019-07-09 | 2019-10-01 | 浙江工程设计有限公司 | A kind of adjustable sulfuric acid dechlorination process and dechlorinator |
| CN110872716A (en) * | 2018-09-04 | 2020-03-10 | 中国科学院过程工程研究所 | Method for removing chloride ions in sulfuric acid solution containing chlorine by adopting photocatalytic fluidized bed |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101367507A (en) * | 2007-08-17 | 2009-02-18 | 新疆石河子中发化工有限责任公司 | Gas removing, filtering and extracting method for waste sulphuric acid |
-
2015
- 2015-05-27 CN CN201510280005.9A patent/CN104891450A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101367507A (en) * | 2007-08-17 | 2009-02-18 | 新疆石河子中发化工有限责任公司 | Gas removing, filtering and extracting method for waste sulphuric acid |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106044723A (en) * | 2016-05-31 | 2016-10-26 | 安徽八化工股份有限公司 | Method for removing free chlorine in waste sulfuric acid produced in chlorine drying process |
| CN106044723B (en) * | 2016-05-31 | 2018-07-06 | 安徽八一化工股份有限公司 | The method for removing free chlorine in the Waste Sulfuric Acid that dry chlorine process generates |
| 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 |
| CN106517104A (en) * | 2016-12-13 | 2017-03-22 | 攀枝花钢企欣宇化工有限公司 | Method for removing free chlorines from waste industrial sulfuric acid |
| CN108786378A (en) * | 2018-07-10 | 2018-11-13 | 四川永祥股份有限公司 | A kind of sulfuric acid cycle dechlorinator, dechlorination system and dechlorination method |
| CN110872716A (en) * | 2018-09-04 | 2020-03-10 | 中国科学院过程工程研究所 | Method for removing chloride ions in sulfuric acid solution containing chlorine by adopting photocatalytic fluidized bed |
| CN110872716B (en) * | 2018-09-04 | 2021-01-08 | 中国科学院过程工程研究所 | Method for removing chloride ions in sulfuric acid solution containing chlorine by adopting photocatalytic fluidized bed |
| CN110294461A (en) * | 2019-07-09 | 2019-10-01 | 浙江工程设计有限公司 | A kind of adjustable sulfuric acid dechlorination process and dechlorinator |
| CN110294461B (en) * | 2019-07-09 | 2023-12-05 | 浙江工程设计有限公司 | Adjustable sulfuric acid dechlorination process and dechlorination tower |
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Application publication date: 20150909 |
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