CN101332977A - Method for separating free chlorine in dilute hydrochloric acid - Google Patents
Method for separating free chlorine in dilute hydrochloric acid Download PDFInfo
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- CN101332977A CN101332977A CNA2007103038104A CN200710303810A CN101332977A CN 101332977 A CN101332977 A CN 101332977A CN A2007103038104 A CNA2007103038104 A CN A2007103038104A CN 200710303810 A CN200710303810 A CN 200710303810A CN 101332977 A CN101332977 A CN 101332977A
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- hydrochloric acid
- free chlorine
- dilute hydrochloric
- chlorine
- activated carbon
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Abstract
The invention discloses a method for separating free chlorine from dilute hydrochloric acid and relates to a method for eliminating free chlorine in dilute hydrochloric acid which is a byproduct of titanium extracting. The method is characterized in that the separating process is as follows: firstly, air is charged in the dilute hydrochloric acid containing free chlorine to bring the free chlorine out in the form of chlorine gas; then the dilute hydrochloric acid flows through an activated carbon fixed bed to eliminate the residual free chlorine and other impurities contained in the hydrochloric acid solution by activated carbon; the dilute hydrochloric acid, the free chlorine removal rate of which meets the standards, enters the working procedure for synthesizing hydrochloric acid; the chlorine gas separated by blowoff and the chlorine gas generated during regeneration of the activated carbon enters the working procedure for preparing sodium hypochlorite. The method for separating free chlorine from dilute hydrochloric acid has low cost, the content of the free chlorine in the dilute hydrochloric acid processed by the method can meet the standard of high-purity hydrochloric acid (less than or equal to 5ppm), and the separated hydrochloric acid and chlorine can be utilized.
Description
Technical field
A kind of method of separating free chlorine in the dilute hydrochloric acid relates to the removal method of free chlorine in a kind of titanium smelting by-product dilute hydrochloric acid.
Background technology
In the smelting process of titanium, adopt dilute hydrochloric acid washing TiCl
4, to remove TiCl
4In unreacted impurity and chlorine, in this process, also have simultaneously a spot of TiCl
4Hydrolysis and produce HCl, final washings is the dilute hydrochloric acid that is rich in free chlorine.Overflow if directly use this acid then to have a large amount of chlorine, contaminate environment, simultaneously can to metallic substance particularly iron and steel strong corrosion is arranged, can't use substantially; Then can not cause the waste of resource if be not used.Employing is taken off the way of analysing and is handled the hydrochloric acid that is rich in free chlorine, and cost of investment is big, working cost is high, seldom uses in the titanium metallurgy industry; Because the hydrochloric acid that is rich in free chlorine is not had good terms of settlement, cause the titanium smeltery mostly with its direct discharging, so both strengthened industrial cost, again environment is polluted.
Summary of the invention
Purpose of the present invention is exactly the deficiency that exists at above-mentioned prior art, provide in a kind of with low cost, hydrochloric acid after handling free cl content can reach the high purity hydrochloric acid standard (≤5ppm), a kind of method of separating free chlorine in the dilute hydrochloric acid can be used separating obtained hydrochloric acid and chlorine.
Purpose of the present invention is achieved through the following technical solutions.
A kind of method of separating free chlorine in the dilute hydrochloric acid is characterized in that its sepn process at first is a bubbling air in containing the dilute hydrochloric acid of free chlorine, will contain free chlorine and take out of with the chlorine form; And then with dilute hydrochloric acid by activated carbon and fixed bed, other impurity that the free chlorine that wherein thoroughly do not eliminate and hydrochloric acid soln are existed utilize charcoal absorption to remove; Its free chlorine is removed dilute hydrochloric acid up to standard and is entered the hydrochloric acid synthesis procedure; The chlorine that produces when chlorine that stripping comes out and regeneration of activated carbon enters preparation clorox operation.
A kind of method of separating free chlorine in the dilute hydrochloric acid of the present invention is characterized in that described what feed is that temperature is 58-60 ℃ a warm air in containing the dilute hydrochloric acid of free chlorine, venting pressure is 2～1.5MPa.
A kind of method of separating free chlorine in the dilute hydrochloric acid of the present invention, then having chlorine when directly feeding air in the dilute hydrochloric acid that is rich in free chlorine overflows, adopt warm air more effective chlorine to be taken out of, warm air can make the temperature of dilute hydrochloric acid raise to some extent simultaneously, along with the rising of temperature, the solubleness of free chlorine in dilute hydrochloric acid can obviously reduce.Gac has the good adsorption effect to the free chlorine in the solution.Present method is further removed the free chlorine in the hydrochloric acid with gac, and the accurate clearance of chlorine can be controlled by the time that adjustment dilute hydrochloric acid stops in the charcoal bed; Gac mainly is physical adsorption to the absorption of free chlorine, also exists chemical catalysis absorption simultaneously, makes free chlorine change into the compound of chlorine, and its chemical catalysis reaction mechanism is:
Cl
2+H
2O□?HCl+HClO
HClO□?HCl+[O]
C+2[O]□?CO
2
Therefore, gac can lose a spot of charcoal in whole absorption dechlorination process, need replenish an amount of gac during regeneration.
Method of the present invention, adoptable technical process is as follows in actual production:
(1) dilute hydrochloric acid that is rich in free chlorine with the titanium smelting by-product carries out the dechlorination processing, the diluted acid that will not contain free chlorine then absorbs HCl gas again to make technical hydrochloric acid, the free chlorine of deviating from is finally made clorox, this method had both efficiently solved the free chlorine dilute hydrochloric acid problem that is rich in of long-term puzzlement titanium smelting industry, hydrochloric acid synthesis procedure for ion film caustic soda provides free chlorine content diluted acid up to standard again, also provide clorox for PVC production, being to achieve many things at one stroke to turn waste into wealth, still is that enterprise all benefits to environment.
(2) this engineering design mainly is divided into following three parts: air scavenging, charcoal absorption dechlorination, vent gas treatment.The concrete effect of each several part is as follows:
A. the dilute hydrochloric acid that is rich in free chlorine (cl content is about 3g/L) that comes of titanium smelting shop, temperature is an envrionment temperature, in its bubbling air stripping tower, goes into warm air at the tower pucking.The content of free chlorine is about 1～1.5g/L from the hydrochloric acid that stripping tower comes out, and temperature is about 40 ℃.
B. will squeeze into the top of activated carbon and fixed bed from the hydrochloric acid that stripping tower comes out with pump, make the hydrochloric acid soln charcoal bed of slowly flowing through then.Hydrochloric acid can further remove the residual free chlorine in the hydrochloric acid soln in the process of touching with the charcoal bench grafting on the one hand, can will may exist other Impurity removals to fall in the hydrochloric acid soln on the other hand.In the dilute hydrochloric acid solution that obtains at last the content of free chlorine reach high purity hydrochloric acid standard (≤5ppm), simultaneously various organic impuritys reach substantially fully and remove in the hydrochloric acid soln.
C. the free chlorine that comes out of warm air stripping is imported emission-control equipment by pipeline, adopts NaOH solution to absorb; The warm air beating desorb is also adopted in the regeneration of gac simultaneously, and the waste gas that obtains is used for PVC production equally by pipeline input emission-control equipment to make clorox.
D. then be piped to the HCl synthesis procedure from the active-carbon bed dilute hydrochloric acid that comes out and absorb HCl gas with the preparation industrial acids.
Embodiment
A kind of method of separating free chlorine in the dilute hydrochloric acid, its sepn process at first are bubbling airs in containing the dilute hydrochloric acid of free chlorine, will contain free chlorine and take out of with the chlorine form; And then with dilute hydrochloric acid by activated carbon and fixed bed, other impurity that the free chlorine that wherein thoroughly do not eliminate and hydrochloric acid soln are existed utilize charcoal absorption to remove; Its free chlorine is removed dilute hydrochloric acid up to standard and is entered the hydrochloric acid synthesis procedure; The chlorine that produces when chlorine that stripping comes out and regeneration of activated carbon enters preparation clorox operation; Described what feed in containing the dilute hydrochloric acid of free chlorine is that temperature is 58-60 ℃ a warm air, and venting pressure is 2～1.5MPa.
Further comment below by embodiment:
Embodiment 1
1, the titanium smelting shop is sent the dilute hydrochloric acid that is rich in free chlorine here, free chlorine content: 3.4g/L, and dilute hydrochloric acid concentration: 21%, temperature: 25 ℃, the conveying of dilute hydrochloric acid is to carry continuously, and flow is 50kg/min.
2, in the air stripping tower, blast 60 ℃ warm air, air flow quantity 200m
3/ h records 35 ℃ of the temperature of exit dilute hydrochloric acid, and the content of free chlorine is 1.4g/L.
3, dilute hydrochloric acid enters activated carbon and fixed bed, and the charcoal bed adopts two series operations, and the speed that dilute hydrochloric acid is flowed through in activated carbon and fixed bed is 0.8m/min, and the content that records free chlorine in the dilute hydrochloric acid of exit is 5ppm, and temperature is 30 ℃.
4, activated carbon and fixed bed adopts two to open one fully, replenishes a certain amount of gac according to practical situation during regeneration of activated carbon.
Contrast table before and after table 1 hydrochloric acid (21%) is handled
Embodiment 2
1, the titanium smelting shop is sent the dilute hydrochloric acid that is rich in free chlorine here, free chlorine content: 3g/L, and dilute hydrochloric acid concentration: 19%, temperature: 24 ℃, the conveying of dilute hydrochloric acid is to carry continuously, and flow is 50kg/min.
2, in the air stripping tower, blast 58 ℃ warm air, air flow quantity 200m
3/ h records 34 ℃ of the temperature of exit dilute hydrochloric acid, and the content of free chlorine is 1.2g/L.
3, dilute hydrochloric acid enters activated carbon and fixed bed, and the charcoal bed adopts two series operations, and the speed that dilute hydrochloric acid is flowed through in activated carbon and fixed bed is 0.8m/min, and the content that records free chlorine in the gained dilute hydrochloric acid of exit is 4ppm, and temperature is 28 ℃.
4, activated carbon and fixed bed adopts two to open one fully, replenishes a certain amount of gac according to practical situation during regeneration of activated carbon.
Contrast table before and after table 2 hydrochloric acid (19%) is handled
Claims (2)
1. a method of separating free chlorine in the dilute hydrochloric acid is characterized in that its sepn process at first is a bubbling air in containing the dilute hydrochloric acid of free chlorine, will contain free chlorine and take out of with the chlorine form; And then with dilute hydrochloric acid by activated carbon and fixed bed, other impurity that the free chlorine that wherein thoroughly do not eliminate and hydrochloric acid soln are existed utilize charcoal absorption to remove; Its free chlorine is removed dilute hydrochloric acid up to standard and is entered the hydrochloric acid synthesis procedure; The chlorine that produces when chlorine that stripping comes out and regeneration of activated carbon enters preparation clorox operation.
2. a kind of method of separating free chlorine in the dilute hydrochloric acid according to claim 1 is characterized in that described what feed is that temperature is 58-60 ℃ a warm air in containing the dilute hydrochloric acid of free chlorine, venting pressure is 2～1.5MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007103038104A CN101332977A (en) | 2007-12-25 | 2007-12-25 | Method for separating free chlorine in dilute hydrochloric acid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007103038104A CN101332977A (en) | 2007-12-25 | 2007-12-25 | Method for separating free chlorine in dilute hydrochloric acid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101332977A true CN101332977A (en) | 2008-12-31 |
Family
ID=40195901
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007103038104A Pending CN101332977A (en) | 2007-12-25 | 2007-12-25 | Method for separating free chlorine in dilute hydrochloric acid |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104812700A (en) * | 2013-11-28 | 2015-07-29 | 阿克马法国公司 | Hydrochloric acid purification process |
| 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 |
| 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 |
| CN115340069A (en) * | 2022-07-06 | 2022-11-15 | 宜宾海丰和锐有限公司 | Method for recycling byproduct hydrogen chloride containing organic matters |
-
2007
- 2007-12-25 CN CNA2007103038104A patent/CN101332977A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104812700A (en) * | 2013-11-28 | 2015-07-29 | 阿克马法国公司 | Hydrochloric acid purification process |
| CN104812700B (en) * | 2013-11-28 | 2018-07-17 | 阿克马法国公司 | The purification process of hydrochloric acid |
| 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 |
| 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 |
| CN115340069A (en) * | 2022-07-06 | 2022-11-15 | 宜宾海丰和锐有限公司 | Method for recycling byproduct hydrogen chloride containing organic matters |
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Open date: 20081231 |