CN103028309A - Absorption method of chlorinated tail gas - Google Patents
Absorption method of chlorinated tail gas Download PDFInfo
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- CN103028309A CN103028309A CN 201210576480 CN201210576480A CN103028309A CN 103028309 A CN103028309 A CN 103028309A CN 201210576480 CN201210576480 CN 201210576480 CN 201210576480 A CN201210576480 A CN 201210576480A CN 103028309 A CN103028309 A CN 103028309A
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- hydrochloric acid
- stage
- tail gas
- ferrous chloride
- drip washing
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Abstract
The invention discloses an absorption method of chlorinated tail gas. The method comprises the sequential steps of three-stage diluted hydrochloric acid elution, two-stage ferrous chloride solution elution, one-stage clear water elution and one-stage lime milk elution absorption for the tail gas, wherein in the three-stage diluted hydrochloric acid elution process, the concentration of hydrochloric acid is 18-22%, and in the two-stage ferrous chloride solution elution process, the concentration of a ferrous chloride solution is 40-50g/L. With the adoption of the absorption method, an adverse effect on an environment as generated NaClO is secondarily decomposed to Cl2 easily when strong base NaOH is adopted to absorb Cl2 is avoided, and the standard tail gas emission can be achieved stably.
Description
Technical field
The invention belongs to the titanium tetrachloride production technical field, particularly the fluidizing chlorination method is produced the absorption process of tail gas in the titanium tetrachloride process.
Background technology
At present, the method of titanium tetrachloride production mainly is the fluidizing chlorination method, after being about to rich titanium material and petroleum coke mixing according to certain ratio, add chlorine and in chlorination furnace, carry out airtight chemical reaction, thereby obtain titanium tetrachloride, this process is called for short chlorination, in actual production in the chlorinated exhaust because containing a large amount of Cl
2, the pernicious gases such as HCl and other chloride, therefore, must to tail gas absorb process after qualified discharge, existing chlorinated exhaust absorption process generally adopts first water wash, again with NaOH or Na
2CO
3Neutralization adopts milk of lime to absorb rear discharging at last.Because the chlorination reaction process is dynamic, chlorinated exhaust amount, composition fluctuate larger, adopt existing method, easily cause the chlorine-containing gas content overproof such as hydrogen chloride in the chlorinated exhaust, environment is impacted, be difficult to the effect that reaches desirable, and adopt highly basic NaOH to absorb Cl
2The time, the easy secondary of the NaClO of generation resolves into Cl
2Environment is caused adverse effect.
Summary of the invention
The problem that exists for solving prior art the invention provides a kind of chlorinated exhaust absorption process, utilizes the method can realize the discharging of chlorinated exhaust stably reaching standard, and production cost is low.
Technical scheme of the present invention is as described below:
A kind of chlorinated exhaust absorption process, sequentially tail gas is carried out three grades of watery hydrochloric acid drip washing, the drip washing of two-stage solution of ferrous chloride, the drip washing of one-level clear water, one-level milk of lime drip washing absorption, concentration of hydrochloric acid is 18～22% in three grades of watery hydrochloric acid lessivations, and solution of ferrous chloride concentration is 40～50g/L in the two-stage solution of ferrous chloride lessivation.
After concentration of hydrochloric acid surpasses 22% after three grades of watery hydrochloric acid drip washing in the present invention, adopt gathering-device to reclaim the preparation that is used for solution of ferrous chloride, realize reclaiming the comprehensive utilization of hydrochloric acid.
Advantage of the present invention and beneficial effect are:
1, can effectively absorb HCl, Cl in the chlorinated exhaust
2, stably realize the tail gas qualified discharge;
2, adopt the solution of ferrous chloride absorbing chlorine, avoided employing highly basic NaOH to absorb Cl
2The time, the easy secondary of the NaClO of generation resolves into Cl
2Environment is caused adverse effect;
3, the hydrochloric acid that reclaims has obtained comprehensive utilization, has reduced production cost.
Description of drawings
Fig. 1 is process chart of the present invention
The specific embodiment
Below the present invention is described in further detail.
At home in certain ∮ 3000mm fluidizing chlorination system of factory, adopt method of the present invention, sequentially tail gas is carried out three grades of watery hydrochloric acid drip washing, the drip washing of two-stage solution of ferrous chloride, the drip washing of one-level clear water, one-level milk of lime drip washing absorption, concentration of hydrochloric acid is 18～22% in three grades of watery hydrochloric acid lessivations, solution of ferrous chloride concentration is 40～50g/L in the two-stage solution of ferrous chloride lessivation, in process of production, and when tail is large-minded, improve solution of ferrous chloride concentration, to increase absorption efficiency.
The chloride tail gas of in the present invention chlorination at first carries out drip washing through three grades of diluted acids, most hydrogen chloride gas in the absorption tail gas, then pass through again the drip washing of two-stage solution of ferrous chloride, chlorine in the absorption tail gas, process is to Data Detection in the chlorinty after the chlorinated exhaust drip washing, in the chlorination system normal course of operation, after three grades of diluted acid drip washing and the drip washing of two-stage frerrous chloride, the content of hydrogen chloride in tail gas and chlorine has almost reached the qualified discharge requirement, but, for guaranteeing to rise because the three grades of watery hydrochloric acid excessive concentration in front affect hydrogen chloride content, increased the one-level clear water and carried out last replenishing.Equally, for avoid because of solution of ferrous chloride in use concentration reduce and affect assimilation effect or chlorine condition and react the bad chlorinty that causes and significantly rise, increase at last the drip washing of one-level limewash and replenish.
In the present invention, after concentration of hydrochloric acid after three grades of watery hydrochloric acid drip washing surpasses 22%, utilize the drainage conduit of eluting column will reclaim hydrochloric acid discharge collection, be used for the preparation of solution of ferrous chloride, realized reclaiming the comprehensive utilization of hydrochloric acid.
Adopt method of the present invention, avoided employing highly basic NaOH to absorb Cl
2The time, the easy secondary of the NaClO of generation resolves into Cl
2The adverse effect that environment is caused, by to the continuous monitoring in three months of this system, tail gas has all been realized qualified discharge.
Claims (2)
1. chlorinated exhaust absorption process, sequentially tail gas is carried out three grades of watery hydrochloric acid drip washing, the drip washing of two-stage solution of ferrous chloride, the drip washing of one-level clear water, one-level milk of lime drip washing absorption, it is characterized in that concentration of hydrochloric acid is 18～22% in described three grades of watery hydrochloric acid lessivations, solution of ferrous chloride concentration is 40～50g/L in the two-stage solution of ferrous chloride lessivation.
2. chlorinated exhaust absorption process according to claim 1, it is characterized in that concentration of hydrochloric acid surpasses 22% after described three grades of watery hydrochloric acid drip washing after, adopt gathering-device to reclaim the preparation that is used for solution of ferrous chloride.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210576480 CN103028309A (en) | 2012-12-26 | 2012-12-26 | Absorption method of chlorinated tail gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210576480 CN103028309A (en) | 2012-12-26 | 2012-12-26 | Absorption method of chlorinated tail gas |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103028309A true CN103028309A (en) | 2013-04-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201210576480 Pending CN103028309A (en) | 2012-12-26 | 2012-12-26 | Absorption method of chlorinated tail gas |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106474876A (en) * | 2016-12-01 | 2017-03-08 | 攀枝花钢企欣宇化工有限公司 | The process reuse method of chlorinated exhaust in a kind of titanium sponge production |
| CN107601555A (en) * | 2017-10-26 | 2018-01-19 | 攀钢集团攀枝花钢铁研究院有限公司 | Carbide slag fluidizes chlorination |
| CN108002586A (en) * | 2017-12-01 | 2018-05-08 | 攀枝花钢企欣宇化工有限公司 | A kind of purifying treatment method of chlorinated exhaust wastewater eluting |
| CN108744919A (en) * | 2018-06-19 | 2018-11-06 | 河南佰利联新材料有限公司 | A kind of chlorinated exhaust processing system and technique |
| CN110813064A (en) * | 2019-12-10 | 2020-02-21 | 遵宝钛业有限公司 | Method for comprehensively treating chlorine-containing tail gas in production of titanium tetrachloride through boiling chlorination |
| CN117563393A (en) * | 2024-01-15 | 2024-02-20 | 潍坊春源化工有限公司 | Combined process and device for removing and purifying impurities containing free chlorine in hydrogen chloride |
-
2012
- 2012-12-26 CN CN 201210576480 patent/CN103028309A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106474876A (en) * | 2016-12-01 | 2017-03-08 | 攀枝花钢企欣宇化工有限公司 | The process reuse method of chlorinated exhaust in a kind of titanium sponge production |
| CN107601555A (en) * | 2017-10-26 | 2018-01-19 | 攀钢集团攀枝花钢铁研究院有限公司 | Carbide slag fluidizes chlorination |
| CN108002586A (en) * | 2017-12-01 | 2018-05-08 | 攀枝花钢企欣宇化工有限公司 | A kind of purifying treatment method of chlorinated exhaust wastewater eluting |
| CN108744919A (en) * | 2018-06-19 | 2018-11-06 | 河南佰利联新材料有限公司 | A kind of chlorinated exhaust processing system and technique |
| CN110813064A (en) * | 2019-12-10 | 2020-02-21 | 遵宝钛业有限公司 | Method for comprehensively treating chlorine-containing tail gas in production of titanium tetrachloride through boiling chlorination |
| CN117563393A (en) * | 2024-01-15 | 2024-02-20 | 潍坊春源化工有限公司 | Combined process and device for removing and purifying impurities containing free chlorine in hydrogen chloride |
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| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20130410 |