CN104645785A - Separation and recovery method for mixed gas of hydrogen chloride and sulfur dioxide - Google Patents
Separation and recovery method for mixed gas of hydrogen chloride and sulfur dioxide Download PDFInfo
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- CN104645785A CN104645785A CN201310596992.4A CN201310596992A CN104645785A CN 104645785 A CN104645785 A CN 104645785A CN 201310596992 A CN201310596992 A CN 201310596992A CN 104645785 A CN104645785 A CN 104645785A
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Abstract
The invention relates to a separation and recovery method for a mixed gas of hydrogen chloride and sulfur dioxide. The method includes: step 1. firstly subjecting the sulfonation reaction generated mixed gas of hydrogen chloride and sulfur dioxide to washing by a bubbler, letting the mixed gas enter the bubbler to remove other substances decomposing after encountering water so as to obtain the gases hydrogen chloride, sulfur dioxide and water vapour; step 2. conducting primary falling film absorption; step 3. carrying out secondary filler absorption; step 4. performing sulfur dioxide filler absorption; and step 5. conducting tail gas treatment. The method provided by the invention utilizes the differences between the gases to conduct absorption conditionally so as to differentiate the two gases, turns waste into treasure to re-enter the production link, thus reducing environmental pollution and also saving the cost of production.
Description
Technical field
The present invention relates to the separation and recovery method of a kind of hydrogen chloride and sulfur dioxide mixture gas.
Background technology
At present in chemical production field, exhaust emission environment is more common, and most acid waste gas is dispersed in the middle of air, not only affects air quality, also easily forms acid rain, to soil with cause acid pollution.Hydrogen chloride, sulfur dioxide are more common sour gas, are to produce separately to reclaim than being easier under susceptible condition, but will produce very large difficulty if the two reclaimed simultaneously,
Summary of the invention
The object of this invention is to provide the separation and recovery method of a kind of hydrogen chloride and sulfur dioxide mixture gas, which utilizes the difference existed between them, have ready conditions and absorb, the two is made a distinction, turns waste into wealth, reenter production link, both reduced environmental pollution, saved production cost again.
The object of the invention is by realize by the following technical solutions: step one, first sulfonating reaction is produced hydrogen chloride and sulfur dioxide mixture gas, after bubbler gas washing, mist enters bubbler, remove other and meet the material of water decomposition, from wherein gas containing hydrogen chloride, sulfur dioxide and steam out;
Step 2, carries out stage falling-film absorption: hydrogen chloride, sulfur dioxide and steam are put into stage falling-film absorption tower, sponges most of hydrogen chloride gas, discharges sulfur dioxide and partial oxidation hydrogen;
Step 3, carries out secondary packing material absorbing: sulfur dioxide and partial oxidation hydrogen are put into secondary packed tower, from the hydrogen chloride gas of secondary packed tower effusion, discharges most of sulfur dioxide gas;
Step 4, carry out sulfur dioxide packing material absorbing: with 15% soda ash solution absorb from secondary packed tower effusion sulfur dioxide, become sodium hydrogensulfite, control pH value between 5.5-6.0 temperature at 20-25 DEG C;
Step 5, vent gas treatment: this cover absorption system keeps negative pressure state by water-ring vacuum system, circulating vacuum unit uses the soda ash solution of 15%.
Liquid acid concentration in stage falling-film absorption tower is controlled at 25-30%, temperature 30-35 DEG C in described step 2.Liquid acid concentration in secondary packed tower is controlled at 10-15%, temperature 15-20 DEG C in described step 3.In described step 2, the acid strength on stage falling-film absorption tower reaches more than 30%, and can deliver to the temporary storage tank of hydrochloric acid and store, its rest is supplemented by solution in secondary packed tower in step 2; Vacancy in secondary packed tower in step 2 has clear water to supplement; In step 3, in sulfur dioxide absorbing tower, concentration of sodium bisulphite reaches 40%, and can send into the temporary storage tank of sodium hydrogensulfite and store, empty portions is supplemented by liquid in vacuum absorption system; The vacancy of vacuum absorption system has 15% fresh soda ash solution to supplement.
The invention has the beneficial effects as follows: relative to prior art, the present invention utilizes the difference existed between hydrogen chloride and sulfur dioxide, has ready conditions and absorbs, the two is made a distinction, turns waste into wealth, reenter production link, both reduced environmental pollution, saved production cost again.The present invention adopts multistage branch to absorb, the dissolubility difference of both utilizations, absorb to greatest extent, hydrogen chloride gas, sulfur dioxide gas are become respectively the raw material hydrochloric acid and sodium hydrogensulfite that again can enter production system, form the absorption system of closed circulation, there is higher sequencing operator scheme, not only economy but also environmental protection.
Detailed description of the invention
The invention provides the separation and recovery method of a kind of hydrogen chloride and sulfur dioxide mixture gas, it comprises the following steps: step one, first sulfonating reaction is produced hydrogen chloride and sulfur dioxide mixture gas, after bubbler gas washing, mist enters bubbler, remove other and meet the material of water decomposition, from wherein gas containing hydrogen chloride, sulfur dioxide and steam out; Step 2, carry out stage falling-film absorption: hydrogen chloride, sulfur dioxide and steam are put into stage falling-film absorption tower, liquid acid concentration in control stage falling-film absorption tower is at 25-30%, temperature 30-35 DEG C, sponge most of hydrogen chloride gas, discharge sulfur dioxide and partial oxidation hydrogen; Step 3, carry out secondary packing material absorbing: sulfur dioxide and partial oxidation hydrogen are put into secondary packed tower, control liquid acid concentration in secondary packed tower at 10-15%, temperature 15-20 DEG C, from the hydrogen chloride gas of secondary packed tower effusion, discharge most of sulfur dioxide gas; Step 4, carry out sulfur dioxide packing material absorbing: with 15% soda ash solution absorb from secondary packed tower effusion sulfur dioxide, become sodium hydrogensulfite, control pH value between 5.5-6.0 temperature at 20-25 DEG C; Step 5, vent gas treatment: this cover absorption system keeps negative pressure state by water-ring vacuum system, circulating vacuum unit uses the soda ash solution of 15%.In step 2 of the present invention, in stage falling-film absorption tower, solution concentration reaches more than 30%, and can deliver to the temporary storage tank of hydrochloric acid and store, its rest is supplemented by solution in secondary packed tower in step 2; Vacancy in secondary packed tower in step 2 has clear water to supplement; In step 3, in sulfur dioxide absorbing tower, concentration of sodium bisulphite reaches 40%, can send into the temporary storage tank of sodium hydrogensulfite and store, and empty portions has liquid in vacuum absorption system to supplement; The vacancy of vacuum absorption system has 15% fresh soda ash solution to supplement.
Claims (4)
1. a separation and recovery method for hydrogen chloride and sulfur dioxide mixture gas, is characterized in that: said method comprising the steps of;
Step one, first produces hydrogen chloride and sulfur dioxide mixture gas by sulfonating reaction, and after bubbler gas washing, mist enters bubbler, removes other and meets the material of water decomposition, from wherein gas containing hydrogen chloride, sulfur dioxide and steam out;
Step 2, carries out stage falling-film absorption: hydrogen chloride, sulfur dioxide and steam are put into stage falling-film absorption tower, sponges most of hydrogen chloride gas, discharges sulfur dioxide and partial oxidation hydrogen;
Step 3, carries out secondary packing material absorbing: visit Japan in secondary packed tower by sulfur dioxide and partial oxidation hydrogen, from the hydrogen chloride gas of secondary packed tower effusion, discharges most of sulfur dioxide gas;
Step 4, carry out sulfur dioxide packing material absorbing: with 15% soda ash solution absorb from secondary packed tower effusion sulfur dioxide, become sodium hydrogensulfite, control pH value between 5.5-6.0 temperature at 20-25 DEG C;
Step 5, vent gas treatment: this cover absorption system keeps negative pressure state by water-ring vacuum system, circulating vacuum unit uses the soda ash solution of 15%.
2. the separation and recovery method of hydrogen chloride according to claim 1 and sulfur dioxide mixture gas, is characterized in that: control liquid acid concentration in stage falling-film absorption tower in described step 2 at 25-30%, temperature 30-35 DEG C.
3. the separation and recovery method of hydrogen chloride according to claim 1 and sulfur dioxide mixture gas, is characterized in that: control liquid acid concentration in secondary packed tower in described step 3 at 10-15%, temperature 15-20 DEG C.
4. the separation and recovery method of hydrogen chloride according to claim 1 and sulfur dioxide mixture gas, it is characterized in that: in described step 2, the acid strength on stage falling-film absorption tower reaches more than 30%, can deliver to the temporary storage tank of hydrochloric acid to store, its rest is supplemented by solution in secondary packed tower in step 2; Vacancy in secondary packed tower in step 2 has clear water to supplement; In step 3, in sulfur dioxide absorbing tower, concentration of sodium bisulphite reaches 40%, and can send into the temporary storage tank of sodium hydrogensulfite and store, empty portions is supplemented by liquid in vacuum absorption system; The vacancy of vacuum absorption system has 15% fresh soda ash solution to supplement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310596992.4A CN104645785A (en) | 2013-11-22 | 2013-11-22 | Separation and recovery method for mixed gas of hydrogen chloride and sulfur dioxide |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310596992.4A CN104645785A (en) | 2013-11-22 | 2013-11-22 | Separation and recovery method for mixed gas of hydrogen chloride and sulfur dioxide |
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| CN104645785A true CN104645785A (en) | 2015-05-27 |
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| CN201310596992.4A Pending CN104645785A (en) | 2013-11-22 | 2013-11-22 | Separation and recovery method for mixed gas of hydrogen chloride and sulfur dioxide |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105148704A (en) * | 2015-07-01 | 2015-12-16 | 太仓市顺邦防腐设备有限公司 | Hydrogen chloride gas absorption system |
| CN105198122A (en) * | 2015-10-26 | 2015-12-30 | 刘阳生 | Resource utilization method of waste hydrochloric acid containing heavy metal lead and iron |
| CN110041216A (en) * | 2019-03-06 | 2019-07-23 | 内蒙古利元科技有限公司 | A kind of novel OAVS production system and technique |
| CN111185079A (en) * | 2019-12-04 | 2020-05-22 | 大连百傲化学股份有限公司 | Resourceful treatment method for acid gas in incineration flue gas |
| CN112370942A (en) * | 2020-11-02 | 2021-02-19 | 江苏春江润田农化有限公司 | Hydrogen chloride and sulfur dioxide mixed tail gas separation device |
-
2013
- 2013-11-22 CN CN201310596992.4A patent/CN104645785A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105148704A (en) * | 2015-07-01 | 2015-12-16 | 太仓市顺邦防腐设备有限公司 | Hydrogen chloride gas absorption system |
| CN105198122A (en) * | 2015-10-26 | 2015-12-30 | 刘阳生 | Resource utilization method of waste hydrochloric acid containing heavy metal lead and iron |
| CN110041216A (en) * | 2019-03-06 | 2019-07-23 | 内蒙古利元科技有限公司 | A kind of novel OAVS production system and technique |
| CN111185079A (en) * | 2019-12-04 | 2020-05-22 | 大连百傲化学股份有限公司 | Resourceful treatment method for acid gas in incineration flue gas |
| CN112370942A (en) * | 2020-11-02 | 2021-02-19 | 江苏春江润田农化有限公司 | Hydrogen chloride and sulfur dioxide mixed tail gas separation device |
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Application publication date: 20150527 |
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| WD01 | Invention patent application deemed withdrawn after publication |