DE3531968A1 - Simultaneous scrubbing of SO2 and NOx having an intermediate step - Google Patents
Simultaneous scrubbing of SO2 and NOx having an intermediate stepInfo
- Publication number
- DE3531968A1 DE3531968A1 DE19853531968 DE3531968A DE3531968A1 DE 3531968 A1 DE3531968 A1 DE 3531968A1 DE 19853531968 DE19853531968 DE 19853531968 DE 3531968 A DE3531968 A DE 3531968A DE 3531968 A1 DE3531968 A1 DE 3531968A1
- Authority
- DE
- Germany
- Prior art keywords
- scrubbing
- iron
- nox
- containing gas
- complex
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
- 238000005201 scrubbing Methods 0.000 title abstract 7
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims abstract description 6
- 239000007788 liquid Substances 0.000 claims abstract description 6
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 5
- CBOCVOKPQGJKKJ-UHFFFAOYSA-L Calcium formate Chemical compound [Ca+2].[O-]C=O.[O-]C=O CBOCVOKPQGJKKJ-UHFFFAOYSA-L 0.000 claims abstract description 3
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 claims abstract description 3
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims abstract description 3
- 239000004280 Sodium formate Substances 0.000 claims abstract description 3
- 229940044172 calcium formate Drugs 0.000 claims abstract description 3
- 235000019255 calcium formate Nutrition 0.000 claims abstract description 3
- 239000004281 calcium formate Substances 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims abstract description 3
- 238000001556 precipitation Methods 0.000 claims abstract description 3
- 229910052708 sodium Inorganic materials 0.000 claims abstract description 3
- 235000019254 sodium formate Nutrition 0.000 claims abstract description 3
- 238000005406 washing Methods 0.000 claims description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract 12
- 229910052742 iron Inorganic materials 0.000 abstract 6
- 239000007789 gas Substances 0.000 abstract 3
- 239000003638 chemical reducing agent Substances 0.000 abstract 2
- 229910021653 sulphate ion Inorganic materials 0.000 abstract 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 abstract 1
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 abstract 1
- 229910002547 FeII Inorganic materials 0.000 abstract 1
- 229910002553 FeIII Inorganic materials 0.000 abstract 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract 1
- 150000004697 chelate complex Chemical class 0.000 abstract 1
- 238000002485 combustion reaction Methods 0.000 abstract 1
- 239000001301 oxygen Substances 0.000 abstract 1
- 229910052760 oxygen Inorganic materials 0.000 abstract 1
- 235000011149 sulphuric acid Nutrition 0.000 abstract 1
- 239000001117 sulphuric acid Substances 0.000 abstract 1
- 238000011282 treatment Methods 0.000 abstract 1
- 238000005200 wet scrubbing Methods 0.000 abstract 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/48—Sulfites
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/60—Simultaneously removing sulfur oxides and nitrogen oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/68—Halogens or halogen compounds
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/46—Sulfates
- C01F11/464—Sulfates of Ca from gases containing sulfur oxides
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Analytical Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Environmental & Geological Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Treating Waste Gases (AREA)
Abstract
It is known to purify SO2 and NOx from combustion exhaust gases by use of a wet scrubbing circulation whose scrubbing water contains iron II-EDTA or iron II-NTA complex. To retain the iron II complex within the scrubbing solution, reducing agents are added or scrubbing water treatments are carried out in the by-pass in order to reduce again the iron oxidized by the atmospheric oxygen from iron II to iron III in the chelate complex and thus to prevent the use of expensive reducing agents. In order further to improve the process according to the main application P 3525051.8 using sodium and/or calcium formate, according to the invention it is proposed that the scrubbing liquid is contacted with the SO2- and NOx-containing gas at a pH below 6, preferably between 4.3 and 4.8, and from this, a portion of the scrubbing water is reduced to a pH around 1.5 by sulphuric acid for EDTA precipitation and by introduction of SO2-containing gas, the reduction phase from FeIII sulphate to FeII sulphate is initiated. The liquid thus treated is returned to the active scrubbing circulation.
Description
Das Verfahren zur simultanen Waschung von SO2 und NO x nach der Patentanmeldung P 35 25 051.8 mittels Natrium und/oder Calciumformiat ist dadurch gekennzeichnet, daß die Waschflüssigkeit mit dem SO2- und NO x -haltigen Gas bei einem pH-Wert um kleiner 6 vorzugsweise zwischen 4,3 und 4,8 in Kontakt gebracht wird, und davon eine Teilmenge des Waschwassers mittels Schwefelsäure auf einen pH-Wert um 1,5 zur EDTA-Fällung abgesenkt und durch Einleitung von SO2-haltigem Gas die Reduktionsphase von Fe-III-Sulfat zu Fe-II-Sulfat eingeleitet wird. Die so behandelte Flüssigkeit wird wieder dem aktiven Waschkreislauf zugeführt.The process for the simultaneous washing of SO 2 and NO x according to patent application P 35 25 051.8 using sodium and / or calcium formate is characterized in that the washing liquid with the gas containing SO 2 and NO x at a pH value of less than 6 is preferably brought into contact between 4.3 and 4.8, and a portion of the washing water is lowered to a pH value of 1.5 by means of sulfuric acid for EDTA precipitation and the reduction phase of Fe- is introduced by introducing SO 2 -containing gas. III sulfate to Fe II sulfate is initiated. The liquid treated in this way is returned to the active washing cycle.
Claims (2)
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19853531968 DE3531968A1 (en) | 1985-07-13 | 1985-09-07 | Simultaneous scrubbing of SO2 and NOx having an intermediate step |
| PCT/EP1986/000317 WO1986006981A1 (en) | 1985-05-25 | 1986-05-24 | METHOD FOR SIMULTANEOUSLY REMOVING BY WASHING SO2, NOx AND OPTIONALLY OTHER NOXIOUS SUBSTANCES CONTAINED IN FLUE GASES IN HEATING INSTALLATIONS SUPPLIED WITH FOSSILE FUELS |
| EP86903350A EP0223803A1 (en) | 1985-05-25 | 1986-05-24 | METHOD FOR SIMULTANEOUSLY REMOVING BY WASHING SO 2?, NO x? AND OPTIONALLY OTHER NOXIOUS SUBSTANCES CONTAINED IN FLUE GASES IN HEATING INSTALLATIONS SUPPLIED WITH FOSSILE FUELS |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19853525051 DE3525051A1 (en) | 1985-07-13 | 1985-07-13 | Process for removing HCl, HF, SO3, SO2 and oxides of nitrogen from combustion exhaust gases by a simultaneous wet scrubbing |
| DE19853531968 DE3531968A1 (en) | 1985-07-13 | 1985-09-07 | Simultaneous scrubbing of SO2 and NOx having an intermediate step |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE3531968A1 true DE3531968A1 (en) | 1987-03-19 |
Family
ID=25833983
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19853531968 Ceased DE3531968A1 (en) | 1985-05-25 | 1985-09-07 | Simultaneous scrubbing of SO2 and NOx having an intermediate step |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE3531968A1 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2460231A1 (en) * | 1973-12-27 | 1975-07-03 | Chisso Eng Co Ltd | PROCESS FOR THE REMOVAL OF NITROGEN OXIDES FROM INDUSTRIAL EXHAUST GASES AND SUITABLE AQUATIC TREATMENT SOLUTIONS |
| DE2554584A1 (en) * | 1974-12-28 | 1976-07-01 | Chisso Corp | METHOD OF REGENERATING AN ABSORBENT SOLUTION THAT HAS BEEN USED TO CLEAN EXHAUST GAS |
-
1985
- 1985-09-07 DE DE19853531968 patent/DE3531968A1/en not_active Ceased
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2460231A1 (en) * | 1973-12-27 | 1975-07-03 | Chisso Eng Co Ltd | PROCESS FOR THE REMOVAL OF NITROGEN OXIDES FROM INDUSTRIAL EXHAUST GASES AND SUITABLE AQUATIC TREATMENT SOLUTIONS |
| DE2554584A1 (en) * | 1974-12-28 | 1976-07-01 | Chisso Corp | METHOD OF REGENERATING AN ABSORBENT SOLUTION THAT HAS BEEN USED TO CLEAN EXHAUST GAS |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| AF | Is addition to no. |
Ref country code: DE Ref document number: 3525051 Format of ref document f/p: P |
|
| OM8 | Search report available as to paragraph 43 lit. 1 sentence 1 patent law | ||
| AF | Is addition to no. |
Ref country code: DE Ref document number: 3525051 Format of ref document f/p: P |
|
| 8131 | Rejection |