DE3531968A1 - Simultaneous scrubbing of SO2 and NOx having an intermediate step - Google Patents

Simultaneous scrubbing of SO2 and NOx having an intermediate step

Info

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
Application number
DE19853531968
Other languages
German (de)
Inventor
Heinz Dipl Ing Hoelter
Heinrich Dipl Ing Igelbuescher
Heinrich Ing Grad Gresch
Heribert Dipl Ing Dewert
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from DE19853525051 external-priority patent/DE3525051A1/en
Application filed by Individual filed Critical Individual
Priority to DE19853531968 priority Critical patent/DE3531968A1/en
Priority to PCT/EP1986/000317 priority patent/WO1986006981A1/en
Priority to EP86903350A priority patent/EP0223803A1/en
Publication of DE3531968A1 publication Critical patent/DE3531968A1/en
Ceased legal-status Critical Current

Links

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)

Anspruch 1Claim 1 Verfahren zur simultanen Waschung von SO2 und NO x nach der Patentanmeldung P 35 25 051.8 mittels Natrium und/oder Calciumformiat 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.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, characterized in that the washing liquid with the SO 2 - and NO x -containing gas at a pH of less than 6 preferably between 4.3 and 4.8 is brought into contact, and a portion of the wash water is lowered to a pH value of 1.5 by means of sulfuric acid for EDTA precipitation and the reduction phase of Fe-III- is introduced by introducing SO 2 -containing gas. Sulfate to Fe-II sulfate is introduced. The liquid treated in this way is returned to the active washing cycle.
DE19853531968 1985-05-25 1985-09-07 Simultaneous scrubbing of SO2 and NOx having an intermediate step Ceased DE3531968A1 (en)

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)

* Cited by examiner, † Cited by third party
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

Patent Citations (2)

* Cited by examiner, † Cited by third party
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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