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DE3523905A1 - Scrubbing water treatment for the simultaneous SO2 and NOx gas purification with an integrated stage for the reduction of iron III to iron II in the scrubbing liquid circulation - Google Patents

Scrubbing water treatment for the simultaneous SO2 and NOx gas purification with an integrated stage for the reduction of iron III to iron II in the scrubbing liquid circulation

Info

Publication number
DE3523905A1
DE3523905A1 DE19853523905 DE3523905A DE3523905A1 DE 3523905 A1 DE3523905 A1 DE 3523905A1 DE 19853523905 DE19853523905 DE 19853523905 DE 3523905 A DE3523905 A DE 3523905A DE 3523905 A1 DE3523905 A1 DE 3523905A1
Authority
DE
Germany
Prior art keywords
iron
scrubbing
water treatment
simultaneous
iii
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
DE19853523905
Other languages
German (de)
Inventor
Erfinder Wird Nachtraeglich Benannt Der
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
Application filed by Individual filed Critical Individual
Priority to DE19853523905 priority Critical patent/DE3523905A1/en
Priority to PCT/EP1986/000207 priority patent/WO1986005709A1/en
Priority to EP86902811A priority patent/EP0217945A1/en
Publication of DE3523905A1 publication Critical patent/DE3523905A1/en
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • 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

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Treating Waste Gases (AREA)

Abstract

Process for the scrubbing water treatment for a simultaneous SO2 and NOx gas purification. The subject-matter of the main application P 3519681.5 is a process for scrubbing water treatment and recovery of valuable substances from flue gas, in which sulphuric acid and air are added in the oxidizer, so that a commercial end product is present as gypsum after the filtration. Surprisingly, it has now been found that by addition of sulphuric acid in the oxidizer to an extent such that the pH is reduced to below 3, preferably in the region around 1.5, in the scrubbing liquid, Fe(III) is reduced to Fe(II) in the course of this.

Description

In der Hauptanmeldung P 35 19 681.5 wird ein Verfahren zur Waschwasseraufbereitung und Wertstoffrückgewinnung entsprechend der dieser Anmeldung beiliegenden Zeichnung bei der simultanen SO2- und NOx-Entfernung aus Rauchgas beschrieben, in der im Oxideur Schwefelsäure (8) und Luft zugegeben wird, so daß ein verkaufsfähiges Endprodukt nach der Filtration als Gips vorliegt.The main application P 35 19 681.5 describes a process for washing water treatment and recovery of valuable materials according to the drawing enclosed with this application for the simultaneous removal of SO 2 and NO x from flue gas, in which sulfuric acid ( 8 ) and air are added in the oxidizer, so that a salable end product is available as gypsum after filtration.

Bei genügend hoher Absenkung des pH-Wertes durch Schwefelsäure-Zugabe wurde gefunden, daß im Bereich von pH kleiner 3 überraschend Eisen-III zu Eisen-II reduziert wurde. If the pH value drops sufficiently, by Sulfuric acid addition was found to be in the range from pH less than 3 surprisingly iron-III to iron-II was reduced.  

Durch diese Findung ist die Zugabe von zusätzlichen Reduktionsmitteln zur Wandlung von Eisen-III in Eisen-II fast, oder je nach Bedarf von Eisen-II, nicht mehr notwendig.Through this finding, the addition of additional Reducing agents for converting iron III into Iron II almost, or as needed by Iron II, not necessary anymore.

Selbstverständlich ist die Erfindung nicht auf die vorstehend beschriebene Ausbildungsform beschränkt, sondern es sind zahlreiche Zugabemöglichkeiten gegeben, ohne jedoch von dem Grundgedanken abzuweichen, daß im Waschführungsprozeß an einer bestimmten Stelle Schwefelsäure zugegeben wird, die die Waschflüssigkeit auf einen pH-Wert unter 3, vorzugsweise um 1,5 absenkt und dabei die in der Waschflüssigkeit enthaltenen Eisen-III-Ionen zu Eisen-II-Ionen reduziert, so daß auf die bisher notwendigen Zugaben von Reduktionsmitteln teilweise oder gänzlich - je nach wunschgerechter Fe(II) Konzentration in der Waschflüssigkeit - verzichtet werden kann, und diese Waschflüssigkeit dem simultanen SO2- und NOx- Waschprozeß direkt wieder zugeführt werden kann.Of course, the invention is not limited to the embodiment described above, but there are numerous options for addition, but without deviating from the basic idea that sulfuric acid is added at a certain point in the washing process, which brings the washing liquid to a pH below 3, preferably around 1.5 lowered and thereby the iron III ions contained in the washing liquid reduced to iron II ions, so that the previously necessary additions of reducing agents are partially or completely dispensed with - depending on the desired Fe (II) concentration in the washing liquid can, and this washing liquid can be fed back to the simultaneous SO 2 and NO x washing process directly.

Claims (1)

Waschwasseraufbereitung für die simultane SO2- und NOx-Gasreinigung mit integrierter Wandlung von Eisen-III zu Eisen-II, nach Hauptanmeldung P 35 19 681.5, dadurch gekennzeichnet, daß die Schwefelsäurezugabe (8) im Oxideur (10) in einem solchen Maße zugeführt wird, daß der pH-Wert auf kleiner 3, vorzugsweise im Bereich um 1,5 in der Waschflüssigkeit abgesenkt wird und dabei Fe(III) zu Fe(II) reduziert wird.Washing water treatment for simultaneous SO 2 and NO x gas cleaning with integrated conversion from iron-III to iron-II, according to main application P 35 19 681.5, characterized in that the addition of sulfuric acid ( 8 ) in the oxidizer ( 10 ) is supplied to such an extent is that the pH is reduced to less than 3, preferably in the range around 1.5 in the washing liquid, and Fe (III) is reduced to Fe (II).
DE19853523905 1985-04-06 1985-07-04 Scrubbing water treatment for the simultaneous SO2 and NOx gas purification with an integrated stage for the reduction of iron III to iron II in the scrubbing liquid circulation Ceased DE3523905A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE19853523905 DE3523905A1 (en) 1985-07-04 1985-07-04 Scrubbing water treatment for the simultaneous SO2 and NOx gas purification with an integrated stage for the reduction of iron III to iron II in the scrubbing liquid circulation
PCT/EP1986/000207 WO1986005709A1 (en) 1985-04-06 1986-04-05 Process for the cleansing of fumes
EP86902811A EP0217945A1 (en) 1985-04-06 1986-04-05 Process for the cleansing of fumes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19853523905 DE3523905A1 (en) 1985-07-04 1985-07-04 Scrubbing water treatment for the simultaneous SO2 and NOx gas purification with an integrated stage for the reduction of iron III to iron II in the scrubbing liquid circulation

Publications (1)

Publication Number Publication Date
DE3523905A1 true DE3523905A1 (en) 1987-01-08

Family

ID=6274928

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19853523905 Ceased DE3523905A1 (en) 1985-04-06 1985-07-04 Scrubbing water treatment for the simultaneous SO2 and NOx gas purification with an integrated stage for the reduction of iron III to iron II in the scrubbing liquid circulation

Country Status (1)

Country Link
DE (1) DE3523905A1 (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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