CN100361891C - Method of removing and reclaiming free chlorine in hydrochloric acid of chlorized by-product - Google Patents
Method of removing and reclaiming free chlorine in hydrochloric acid of chlorized by-product Download PDFInfo
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- CN100361891C CN100361891C CNB2005101309992A CN200510130999A CN100361891C CN 100361891 C CN100361891 C CN 100361891C CN B2005101309992 A CNB2005101309992 A CN B2005101309992A CN 200510130999 A CN200510130999 A CN 200510130999A CN 100361891 C CN100361891 C CN 100361891C
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- hydrochloric acid
- chlorine
- iron
- iron trichloride
- free chlorine
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Abstract
The present invention relates to a method for removing and recycling free chlorine in hydrogen chloride as chlorination byproducts. Most of free chlorine in the hydrochloric acid is blown out by compressed air, and the chlorine which is blown out reacts with iron dust to generate iron trichloride, so the standard air is discharged after purification; then, a proper quantity of organic acid is added into the hydrochloric acid according to the content of residual chlorine in the hydrochloric acid for sufficient reaction, so qualified technical hydrochloric acid is obtained. The method of the present realizes the continuous production and is suitable for being used in all chemical processes with the chlorine for chlorination, such as chloroparaffin, chlorobenzene, polyvinyl chloride, etc.
Description
The present invention relates to a kind ofly from chlorinated secondary product hydrochloric acid, remove free chlorine, and with the method for its recycling.
At present, in domestic chlorinated with chlorine process such as the production processes such as clorafin and chlorobenzene, all there are a large amount of byproduct hydrogen chlorides to produce, all be that water absorbs preparation hydrochloric acid, but because of being mixed with a large amount of unreacted chlorine in the hydrogen chloride gas, water absorbs in the process of preparation hydrochloric acid, and chlorine also is dissolved in wherein, forms free chlorine.Because these free chlorines can come out in user's use, production environment is caused severe contamination, also because free chlorine is very active, can participate in many chemical reactions, limited the application of this by-product hydrochloric acid greatly, caused many manufacturers can't use directly with its discharging because of by-product hydrochloric acid.Cause production cost to strengthen because of by-product hydrochloric acid can't reclaim on the one hand, the direct discharging of by-product hydrochloric acid has caused very serious pollution to environment on the other hand.Though report and the application of adopting the method that blows off are early arranged, can cause the chlorine secondary pollution and be difficult to reasons such as the free chlorine in the by-product hydrochloric acid thoroughly blows off are not obtained large-scale promotion application so far because of blowing off method.
The purpose of this invention is to provide and a kind ofly from chlorinated secondary product hydrochloric acid, remove free chlorine, prepare qualified hydrochloric acid, and free chlorine is recycled the method that prepare solid or liquid ferrous trichloride, have the weak point that Technology exists now to solve.
The removal of free chlorine and the method for recycling comprise the following steps: in a kind of chlorinated secondary product hydrochloric acid of the present invention
(1), with by-product hydrogen chloride gas after organism is removed in charcoal absorption, absorb with water cycle and to produce concentrated hydrochloric acid;
(2) pressurized air is fed bubbling in the concentrated hydrochloric acid, the part free chlorine in the hydrochloric acid is blown out;
(3) the above-mentioned pressurized air that contains chlorine is fed the packing tower bottom that iron filings are housed, and by the iron filings packing layer, chlorine wherein and iron filings reaction generate iron trichloride, and the pressurized air that is purified enters atmosphere from cat head, reach the purpose that chlorine is recycled, concrete reaction formula is as follows:
3Cl
2+2Fe＝2FeCl
3
(4) water or dilute hydrochloric acid are squeezed into the above-mentioned packing tower top that iron filings are housed, flow through the iron filings packing layer from top to bottom, iron trichloride dissolving back is discharged at the bottom of tower, obtain the iron trichloride dilute solution.
(5) above-mentioned iron trichloride dilute solution is squeezed into the above-mentioned packing tower top circulation absorption iron trichloride that iron filings are housed and to be got the iron trichloride saturated solution;
(6), get solid iron trichloride product with the crystallization of above-mentioned iron trichloride saturated solution;
(7) according to the content of residual free chlorine in the hydrochloric acid after the above-mentioned method that blows off is handled, add an amount of organic acid itself and free chlorine are fully reacted, and be translated into hydrochloric acid, to prepare qualified technical hydrochloric acid.
The present invention has following advantage:
1, earlier blow off method with air and blow out most of free chlorine in the hydrochloric acid, the amount according to residual chlorine in the hydrochloric acid adds organic acid again, makes that the free chlorine in the hydrochloric acid is removed completely, can prepare qualified technical hydrochloric acid;
2, will blow off chlorine and the iron filings reaction that method blows out with air, and make chlorine obtain recycling on the one hand, avoid atmospheric pollution, have obvious social; Can obtain industrial solid or liquid ferrous trichloride on the other hand, increase range of product, improve economic benefit;
3, processing method simple possible, less investment, instant effect, possessing turns waste into wealth, and notions such as recycling economy and Sustainable development should obtain the support energetically and the support of national departments concerned.
Further comment below by embodiment:
Embodiment:
1, the byproduct hydrogen chloride gas that produces in the chlorination process after removing organism, is fed graphitic absorber in charcoal absorption, water or dilute hydrochloric acid circularly absorbing hydrogen chloride gas prepare concentrated hydrochloric acid in the graphite water aspirator, simultaneously, unreacted chlorine is brought in the concentrated hydrochloric acid, and also available pressurized air is pressed into unreacted chlorine and hydrogen chloride gas in the concentrated hydrochloric acid;
2, the concentrated hydrochloric acid that will reach predetermined concentration (28～31%) is squeezed in the airtight dechlorination still with acid proof pump, feeds pressurized air then and carries out bubbling, and wherein chlorine is blown out;
3, the pressurized air that will contain chlorine with conduit is introduced the packing tower bottom that iron filings are housed, pressurized air after the purification enters atmosphere through behind the packing tower from cat head, and chlorine wherein and iron filings reaction generate iron trichloride, water or dilute hydrochloric acid are squeezed into packing tower top, flow through the iron filings packing layer from top to bottom, iron trichloride dissolving back is discharged at the bottom of tower, be trichlorine iron dilute solution, the packing tower top is squeezed in iron trichloride dilute solution circulation absorbed repeatedly and can get the iron trichloride saturated solution, crystallization can get solid iron trichloride product;
4, according to practical situation regular replenishment iron filings.
Claims (1)
1. the removal of free chlorine and the method for recycling in the chlorinated secondary product hydrochloric acid is characterized in that: (1), with by-product hydrogen chloride gas after organism is removed in charcoal absorption, absorb with water cycle and to produce concentrated hydrochloric acid;
(2) pressurized air is fed bubbling in the concentrated hydrochloric acid, the part free chlorine in the hydrochloric acid is blown out;
(3) the above-mentioned pressurized air that contains chlorine is fed the packing tower bottom that iron filings are housed, and by the iron filings packing layer, chlorine wherein and iron filings reaction generate iron trichloride, and the pressurized air that is purified enters atmosphere from cat head, reach the purpose that chlorine is recycled, concrete reaction formula is as follows:
3Cl
2+2Fe＝2FeCl
3
(4) water or dilute hydrochloric acid are squeezed into the above-mentioned packing tower top that iron filings are housed, flow through the iron filings packing layer from top to bottom, iron trichloride dissolving back is discharged at the bottom of tower, obtain the iron trichloride dilute solution;
(5) above-mentioned iron trichloride dilute solution is squeezed into the above-mentioned packing tower top circulation absorption iron trichloride that iron filings are housed and got the iron trichloride saturated solution;
(6), get solid iron trichloride product with the crystallization of above-mentioned iron trichloride saturated solution;
(7) according to the content of residual free chlorine in the hydrochloric acid after the above-mentioned method that blows off is handled, add an amount of organic acid itself and free chlorine are fully reacted, and be translated into hydrochloric acid, to prepare qualified technical hydrochloric acid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101309992A CN100361891C (en) | 2005-12-19 | 2005-12-19 | Method of removing and reclaiming free chlorine in hydrochloric acid of chlorized by-product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101309992A CN100361891C (en) | 2005-12-19 | 2005-12-19 | Method of removing and reclaiming free chlorine in hydrochloric acid of chlorized by-product |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1834003A CN1834003A (en) | 2006-09-20 |
| CN100361891C true CN100361891C (en) | 2008-01-16 |
Family
ID=37001928
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005101309992A Expired - Fee Related CN100361891C (en) | 2005-12-19 | 2005-12-19 | Method of removing and reclaiming free chlorine in hydrochloric acid of chlorized by-product |
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| CN (1) | CN100361891C (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100591648C (en) * | 2006-12-27 | 2010-02-24 | 贵州蓝天化工有限公司 | Technique for coproducing polyvinyl chloride from by-product hydrogen chloride of trichloroethylene |
| CN101210900B (en) * | 2006-12-30 | 2010-11-17 | 仇晓丰 | Free chloride on-line detection process during hydrogenchloride synthesis and the device therefor |
| CN106219612B (en) * | 2016-06-30 | 2017-12-22 | 栗晓光 | A kind of processing method of waste chlorine |
| CN107043090B (en) * | 2017-01-06 | 2019-08-06 | 江苏吉华化工有限公司 | It is a kind of for improve recycling hydrochloric acid in removal rate of sulfur dioxide devices and methods therefor |
| CN108079771A (en) * | 2017-12-29 | 2018-05-29 | 攀枝花钢企欣宇化工有限公司 | The absorption processing method of chlorinated exhaust |
| CN111439726A (en) * | 2019-01-17 | 2020-07-24 | 太原理工大学 | Purification method of byproduct hydrochloric acid in technological process of producing chloroacetic acid |
| CN109704281A (en) * | 2019-01-17 | 2019-05-03 | 太原理工大学 | A method of go to demineralizing acid middle reaches from chlorine using organic reducing agent |
| CN109467134B (en) * | 2019-01-22 | 2021-07-06 | 安徽久易农业股份有限公司 | Method for recovering waste ferrous chloride aqueous solution |
| CN113277473B (en) * | 2021-05-13 | 2022-07-12 | 万华化学（宁波）有限公司 | Process for decomposing residual chlorine in hydrochloric acid |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1155512A (en) * | 1995-10-04 | 1997-07-30 | 巴斯福股份公司 | Selective separation and recovery of chlorine from gas mixtures |
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2005
- 2005-12-19 CN CNB2005101309992A patent/CN100361891C/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1155512A (en) * | 1995-10-04 | 1997-07-30 | 巴斯福股份公司 | Selective separation and recovery of chlorine from gas mixtures |
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| CN1834003A (en) | 2006-09-20 |
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Granted publication date: 20080116 Termination date: 20101219 |