CN102033119A - One-step method for detecting concentration of chlorine and chlorinated hydrogen in pollution source waste gas - Google Patents
One-step method for detecting concentration of chlorine and chlorinated hydrogen in pollution source waste gas Download PDFInfo
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- CN102033119A CN102033119A CN 201010540156 CN201010540156A CN102033119A CN 102033119 A CN102033119 A CN 102033119A CN 201010540156 CN201010540156 CN 201010540156 CN 201010540156 A CN201010540156 A CN 201010540156A CN 102033119 A CN102033119 A CN 102033119A
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Abstract
The invention discloses a one-step method for detecting the concentration of chlorine and chlorinated hydrogen in pollution source waste gas, which has the following steps of: connecting in series two absorption bottles respectively filled with 50 ml of alkali absorption solution with concentration of 0.1-0.2 mol/L for sampling; after collecting the samples, mixing sample solutions in the two bottles, and adding the alkali absorption solution with concentration of 0.1-0.2 mol/L until the total sample solution volume reaches 125 ml; moving 25 ml of solution from the total sample solution to an iodine flask for detecting the concentration of chlorine by using iodometry, and then moving 25 ml of solution sample solution for detecting the concentration of total chlorinated hydrogen in the sample solution by using silver nitrate volumetric method; and finally, calculating the actual concentration of chlorinated hydrogen by using a corrector formula. The method can be used for simultaneously analyzing chlorine and chlorinated hydrogen by one share of absorption solution, and eliminate the positive interference of chlorine to chlorinated hydrogen, thereby accurately determining the concentration of chlorine and chlorinated hydrogen in pollution source waste gas.
Description
Technical field
The present invention relates to the assay method of chlorine and hydrogen chloride gas concentration in a kind of waste gas, relate in particular in chlorine industry and the dchlorine metallurgy industrial processes the accurate check and analysis computing method of chlorine in the pollution source waste gas that is discharged and hydrogen chloride gas concentration.
Background technology
We continue to use the pollution source detection method of regulation in " ambient air monitoring quality control (assurrance) manual " always chlorine and hydrogen chloride gas are monitored in the pollution source monitoring for a long time.Wherein, chlorine iodimetric titration, hydrogen chloride gas silver nitrate volumetric determination.But the hydrogen chloride testing result often departs from the actual analysis result that production is discharged, and traces it to its cause, and is exactly not eliminate the interference of chlorine for hydrogen chloride gas, causes in the pollution source waste gas of mensuration the hydrogen chloride gas result higher.
Summary of the invention
The invention provides a kind of accurate check and analysis and calculate the chlorine in the pollution source waste gas and the method for hydrogen chloride gas concentration.
The technical solution used in the present invention is: the method for chlorine and hydrogen chloride gas concentration in a kind of single stage method mensuration pollution source waste gas, concrete steps are as follows: with two absorption bottle polyphone samplings of all adorning 50 milliliters of 0.1～0.2 mol alkali absorption liquids, sample adopt after, sample solution in two absorption bottles is merged, add 0.1～0.2 mol alkali absorption liquid to gross sample liquor capacity again and reach 125 milliliters; From gross sample solution, get 25 ml solns earlier and move into iodine flask, use the iodometric determination chlorine gas concentration, and then get 25 ml sample solution total hydrogen cloride concentration in the silver nitrate volumetric determination sample solution; Calculate its concentration of actual hydrogen chloride with updating formula at last.
Theoretical analysis of the present invention: the alkali absorption liquid adopts the NaOH absorption liquid.During with the hydrogen chloride gas in the NaOH absorption liquid absorption pollution source waste gas of 0.1～0.2 mol, chlorine wherein also all enters absorption liquid, generate sodium hypochlorite and sodium chloride with the NaOH effect, thereby generation is just disturbed.Concrete reaction is as follows:
HCl ＋ NaOH ＝?NaCl ＋ H
2O (1)
Cl
2 ＋ 2?NaOH ＝?NaCl ＋ H
2O ＋ NaClO (2)
E
0(volt) ClO
-
0.42 Cl
2 1.36 Cl
-
By the electrode potential of chlorine as can be seen, the alkali chemical reaction that absorbs chlorine can carry out.Equilibrium constant K=1.7 * 1016 that potential value calculated of reaction (2), it is more complete to illustrate that this reaction is carried out.
But how is the stability of sodium hypochlorite? whether it following decomposition can take place:
3NaClO ＝ 2NaCl ＋ NaClO
3? （3）
By above-mentioned electrode potential as can be seen, E
0A left side＜E
0The right side, disproportionation reaction might take place in sodium hypochlorite instability in alkaline solution, but the energy of activation of this reaction is bigger, and possible hardly at normal temperatures, only when the above temperature of 700oC, just can react.Because the chlorine and the hydrogen chloride gas quantity of being adopted are very little, and absorption bottle is subjected to the influence of ambient temperature in the gas sampling process, and absorption temperature is carried out at normal temperatures, and therefore, sodium hypochlorite can further not be disproportionated into sodium chlorate.
According to the above-mentioned theory analysis, aqueous slkali has absorbed chlorine and hydrogen chloride gas fully, and we can adopt with a absorption liquid and analyze chlorine and hydrogen chloride gas simultaneously, and eliminates the just interference of chlorine for hydrogen chloride gas.Thereby determine the chlorine in the pollution source waste gas and the concentration of hydrogen chloride gas accurately.
Embodiment
The method of chlorine and hydrogen chloride gas concentration in a kind of single stage method mensuration pollution source waste gas, concrete steps are as follows: with two absorption bottle polyphone samplings of all adorning 50 milliliters of 0.1～0.2 mol NaOH absorption liquids, sample adopt after, sample solution in two absorption bottles is merged, add 0.1～0.2 mol NaOH absorption liquid to gross sample liquor capacity again and reach 125 milliliters; From gross sample solution, get 25 milliliters of liquid earlier and move into iodine flask, use the iodometric determination chlorine gas concentration, and then get 25 ml sample solution total hydrogen cloride concentration in the silver nitrate volumetric determination sample solution; Calculate the concentration of actual hydrogen chloride gas at last with updating formula.
Wherein be with iodometric determination chlorine gas concentration computing formula:
In the formula:
---chlorine gas concentration (g/Nm
3)
A---titration sample consumes sodium thiosulfate titer volume (ml)
B---blank solution consumes sodium thiosulfate titer volume (ml)
C(1/2Na
2S
30
3)---sodium thiosulfate standard solution concentration (mol/l)
Vs---gross sample liquor capacity (125 ml) 35.5---molar weight of chlorine
25---institute's extracting sample solution volume (ml) Vnd during analysis---sampling volume (Nm
3) (under the operating mode, sampling volume is 10～20 liters)
The computing formula of " total hydrogen chloride " concentration is in the silver nitrate volumetric determination sample solution:
C
=?（A’-B’）×C（AgNO
3）×36.5×Vs/25〕/ Vnd (5)
In the formula: C
---hydrogen chloride " total concentration " (g/Nm
3)
A '---titration sample consumes silver nitrate titer volume (ml)
B '---blank solution consumes silver nitrate titer volume (ml)
C(AgNO
3)---silver nitrate concentration of standard solution (mol/l)
36.5---the molar weight of hydrogen chloride
Vs, 25, Vnd---symbolic significance is the same;
Actual hydrogen chloride gas concentration correction computing formula is:
C
HCl?= C?
－?(36.5/71)?×
(6)
In the formula: C
HCl---proofread and correct afterchlorinate hydrogen concentration (g/Nm
3)
C
---symbolic significance is the same
According to the present invention, analyze the chlorine in certain pollution source chlorine contained exhaust gas and the partial data of hydrogen chloride gas at the actual production field monitoring, and, chlorine and hydrogen chloride gas accurate result in this pollution source waste gas have been measured more accurately with the result after formula (6) correction.Concrete outcome is seen attached list.
Subordinate list chlorine contained exhaust gas pollution source chlorine and hydrogen chloride gas detect and proofread and correct the result
Claims (2)
1. a single stage method is measured the method for chlorine and hydrogen chloride gas concentration in the pollution source waste gas, it is characterized in that: concrete steps are as follows: with two absorption bottle polyphone samplings of all adorning 50 milliliters of 0.1～0.2 mol alkali absorption liquids, sample adopt after, sample solution in two absorption bottles is merged, add 0.1～0.2 mol alkali absorption liquid to gross sample liquor capacity again and reach 125 milliliters; From gross sample solution, get 25 milliliters of liquid earlier and move into iodine flask, use the iodometric determination chlorine gas concentration, and then get 25 ml sample solution total hydrogen cloride concentration in the silver nitrate volumetric determination sample solution; Calculate the concentration of actual hydrogen chloride gas at last with updating formula.
2. method according to claim 1 is characterized in that: described alkali absorption liquid is the NaOH absorption liquid.
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|---|---|---|---|
| CN 201010540156 CN102033119A (en) | 2010-11-10 | 2010-11-10 | One-step method for detecting concentration of chlorine and chlorinated hydrogen in pollution source waste gas |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111122556A (en) * | 2018-10-31 | 2020-05-08 | Tcl集团股份有限公司 | Method for detecting chloroform in quantum dot solution |
| CN111693652A (en) * | 2020-06-23 | 2020-09-22 | 攀钢集团攀枝花钢铁研究院有限公司 | Analysis method and treatment system for chlorine-containing waste gas generated by high-temperature water quenching of chlorination slag |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101261240A (en) * | 2008-04-08 | 2008-09-10 | 杭州电子科技大学 | Chlorine gas concentration on-line monitoring device |
| CN101413882A (en) * | 2008-11-21 | 2009-04-22 | 聚光科技（杭州）有限公司 | Method and apparatus for detecting chlorine and hydrogen chloride in PVC production |
-
2010
- 2010-11-10 CN CN 201010540156 patent/CN102033119A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101261240A (en) * | 2008-04-08 | 2008-09-10 | 杭州电子科技大学 | Chlorine gas concentration on-line monitoring device |
| CN101413882A (en) * | 2008-11-21 | 2009-04-22 | 聚光科技（杭州）有限公司 | Method and apparatus for detecting chlorine and hydrogen chloride in PVC production |
Non-Patent Citations (1)
| Title |
|---|
| 《中国环境监测》 19971231 王新文 一步法测定污染源废气中氯气和氯化氢 第58页 1-2 第13卷, 第4期 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111122556A (en) * | 2018-10-31 | 2020-05-08 | Tcl集团股份有限公司 | Method for detecting chloroform in quantum dot solution |
| CN111122556B (en) * | 2018-10-31 | 2021-07-16 | Tcl科技集团股份有限公司 | Method for detecting chloroform in quantum dot solution |
| CN111693652A (en) * | 2020-06-23 | 2020-09-22 | 攀钢集团攀枝花钢铁研究院有限公司 | Analysis method and treatment system for chlorine-containing waste gas generated by high-temperature water quenching of chlorination slag |
| CN111693652B (en) * | 2020-06-23 | 2022-07-26 | 攀钢集团攀枝花钢铁研究院有限公司 | Analysis method and treatment system for chlorine-containing waste gas generated by high-temperature water quenching of chlorination slag |
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Application publication date: 20110427 |