DE2541821A1 - Scrubbing combustion waste gases - using alkali contg. liquid and also adding lime - Google Patents

Scrubbing combustion waste gases - using alkali contg. liquid and also adding lime

Info

Publication number
DE2541821A1
DE2541821A1 DE19752541821 DE2541821A DE2541821A1 DE 2541821 A1 DE2541821 A1 DE 2541821A1 DE 19752541821 DE19752541821 DE 19752541821 DE 2541821 A DE2541821 A DE 2541821A DE 2541821 A1 DE2541821 A1 DE 2541821A1
Authority
DE
Germany
Prior art keywords
alkali
contg
waste gases
liquid
oxidation
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
DE19752541821
Other languages
German (de)
Inventor
Heinz Gresch
Heinz Hoelter
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 DE19752541821 priority Critical patent/DE2541821A1/en
Publication of DE2541821A1 publication Critical patent/DE2541821A1/en
Ceased legal-status Critical Current

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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
    • B01D53/68—Halogens or halogen compounds
    • 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
    • B01D53/48—Sulfur compounds
    • B01D53/50—Sulfur oxides
    • B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound

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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

The waste gases, contg. SO2 and HCl are scrubbed with alkali contg. liquid and the bisulphite formed oxidised with air to the sulphate after adjusting the pH to 5-7. To neutralise the sulphuric acid liberated during the oxidn additional alkali wash or alkali salt such as soda lye or Na carbonate is added. By the further addn. of lime, the rate of this oxidn. is raised and at the same time the amt. of additional alkali required above, can be reduced. Used for treating waste gases from waste incinerators, power stations etc.

Description

Beschreibung und Erläuterung zur PatentanmeldungDescription and explanation of the patent application

"Verfahren zur Abgasreinigung mit Alkalilaugen oder Alkalisalzen und Kalk, wobei das Gas mit Schwefeldioxid und Salzsäure angereichert ist" Es ist bekannt, für die Vollentsorgung von Abgasen hinter Mullverbrennungs- oder Kraftwerks-Anlagen ein Waschwasser einzusetzen, dem Alkalilaugen und Salze, wie Natriumkarbonatlösung, Natronlauge, usw. zugeimpft wird."Process for exhaust gas cleaning with alkali solutions or alkali salts and Lime, the gas being enriched with sulfur dioxide and hydrochloric acid "It is known for the complete disposal of exhaust gases behind waste incineration or power plant systems to use a wash water containing alkaline solutions and salts, such as sodium carbonate solution, Caustic soda, etc. is inoculated.

Als Endprodukte entstehen Alkalichloride und Alkalisulfite oder -bisulfite. The end products are alkali chlorides and alkali sulfites or bisulfites.

Die gebildeten Sulfite bzw. Bisulfite dürfen nicht (zur Verhinderung der Waschwasserau-salzung) mit dem abzugebenden Waschwasser in die Vorflut abgelassen werden.The sulfites or bisulfites formed must not (to prevent the washing water salinization) with the washing water to be dispensed into the receiving water will.

Erfindungsgemäß ist es daher notwendig, eine Oxidation von Alkalisulfit zu Alkalisulfat entsprechend nachstehendem erfindungsgemäßen Gedanken vorzunehmen.According to the invention it is therefore necessary to oxidize alkali metal sulfite to make alkali sulfate in accordance with the inventive idea below.

Die Oxidation erfolgt durch Einblasen von Luft in die Waschlösung bei einem pH-Wert, der zwischen pH 5 und 7 gehalten wird.The oxidation takes place by blowing air into the washing solution at a pH which is kept between pH 5 and 7.

Da bei der Oxidation freie Schwefelsäure entsteht, ist es zur Einhaltung eines konstanten pH-Bereiches erforderlich, der Waschflüssigkeit ständig Alkalilaugen oder -salze zuzuführen.Since free sulfuric acid is produced during the oxidation, it must be observed a constant pH range is required, the washing liquid constantly alkaline solutions or salts to be added.

2 NaHSD3 °2 ~ Na2SO4 + H2SD4 H2SD4 Na2CD3 - Na2SD4 H20 CO, t Um die beschriebene Oxidation erfindungsgemäß zu beschleunigen und den teuren Einsatz von Alkalien zu senken, wird vorge -schlagen, als Neutralisationsmittel für die bei der Oxidation gebildete Schwefelsäure Kalk in den Oxidationsbehälter einzutragen.2 NaHSD3 ° 2 ~ Na2SO4 + H2SD4 H2SD4 Na2CD3 - Na2SD4 H20 CO, t around the According to the invention to accelerate described oxidation and the expensive use of Lowering alkalis is suggested as a neutralizing agent for the at sulfuric acid formed during the oxidation to enter lime into the oxidation tank.

Als Endprodukte entstehen das im Wasser lösliche Natriumsulfat und das je nach Alkalichloridgehalt der Waschlösung mehr oder weniger im Wasser lösliche Calciumsulfat.The end products are sodium sulphate and soluble in water which, depending on the alkali chloride content of the washing solution, is more or less soluble in the water Calcium sulfate.

2 NaHSD4 w °2 Na2SO4 H2SD4 H2SD4 ç Ca(OH)2 oCaS04 . 2H20 Selbstverständlich ist die Erfindung nicht auf die vorstehend im einzelnen dargestellte und beschriebene Ausbildungsform beschränkt, sondern es sind zahlreiche Abänderungen möglich, ohne jedoch von dem Grundgedanken abzuweichen, für die chemische Abbindung von Schwefeldioxid Alkalien einzusetzen und bis zum Alkalibisulfit auszuwaschen und für die bei der Oxidation freiwerdenden Schwefelsäuren als Neutralisationsmittel zur Beschleunigung der Neutralisation, d.h. erhöhte Reaktionsgeschwindigkeit, Wandlung zu Sulfaten, Kalk einzusetzen.2 NaHSD4 w ° 2 Na2SO4 H2SD4 H2SD4 ç Ca (OH) 2 oCaS04. 2H20 Of course the invention is not limited to that illustrated and described in detail above Form of training limited, but numerous changes are possible without however to deviate from the basic idea for the chemical setting of sulfur dioxide Use alkalis and wash out to the alkali bisulfite and for the at the Oxidation of released sulfuric acids as a neutralizing agent for acceleration neutralization, i.e. increased reaction rate, conversion to sulfates, To use lime.

PatentanspruchClaim

Claims (1)

Patentanspruch: Verfahren zur Abgasreinigung dadurch gekennzeichnet, daß die Waschflüssigkeit zur Abgasreinigung, die mit Alkali versetzt ist, bis zu Alkalibisulfit gewaschen wird und bei einem pH-Wert zwischen 5 und 7 mittels Luft zum Alkalisulfat oxidiert wird, und zur Neutralisation der bei der Oxidation freiwerdenden Schwefelsäure zusätzlich Alkalilaugen oder Alkalisalze, wie z.B. Natronlauge oder Natriumkarbonat, eingesetzt werden.sowie zur Erhöhung der Oxidationsgeschwindigkeit und zur Einsparung von Alkalien für die Neutralisation der bei der Oxidation gebildeten Schwefelsäure Kalk eingesetzt wird.Claim: Process for exhaust gas purification characterized in that that the scrubbing liquid for exhaust gas cleaning, which is mixed with alkali, up to Alkali bisulfite is washed and at a pH value between 5 and 7 by means of air is oxidized to alkali sulfate, and to neutralize the released during the oxidation Sulfuric acid in addition to alkali lyes or alkali salts, such as caustic soda or Sodium carbonate, as well as to increase the rate of oxidation and to save alkalis for the neutralization of those formed in the oxidation Sulfuric acid lime is used.
DE19752541821 1975-09-19 1975-09-19 Scrubbing combustion waste gases - using alkali contg. liquid and also adding lime Ceased DE2541821A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19752541821 DE2541821A1 (en) 1975-09-19 1975-09-19 Scrubbing combustion waste gases - using alkali contg. liquid and also adding lime

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19752541821 DE2541821A1 (en) 1975-09-19 1975-09-19 Scrubbing combustion waste gases - using alkali contg. liquid and also adding lime

Publications (1)

Publication Number Publication Date
DE2541821A1 true DE2541821A1 (en) 1977-03-31

Family

ID=5956907

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19752541821 Ceased DE2541821A1 (en) 1975-09-19 1975-09-19 Scrubbing combustion waste gases - using alkali contg. liquid and also adding lime

Country Status (1)

Country Link
DE (1) DE2541821A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0005301A1 (en) * 1978-05-10 1979-11-14 Metallgesellschaft Ag Process for the removal of sulphur oxides from high-chloride flue gases
DE3603366A1 (en) * 1985-02-05 1986-08-07 Mitsubishi Jukogyo K.K., Tokio/Tokyo METHOD FOR DESULFURING EXHAUST GAS
DE3716566A1 (en) * 1987-05-18 1988-12-01 Fichtel Roland Process for the production of reactive calcium hydroxides for exhaust gas purification

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0005301A1 (en) * 1978-05-10 1979-11-14 Metallgesellschaft Ag Process for the removal of sulphur oxides from high-chloride flue gases
DE3603366A1 (en) * 1985-02-05 1986-08-07 Mitsubishi Jukogyo K.K., Tokio/Tokyo METHOD FOR DESULFURING EXHAUST GAS
US4696805A (en) * 1985-02-05 1987-09-29 Mitsubishi Jukogyo Kabushiki Kaisha Method for desulfurizing exhaust gas
DE3716566A1 (en) * 1987-05-18 1988-12-01 Fichtel Roland Process for the production of reactive calcium hydroxides for exhaust gas purification

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Legal Events

Date Code Title Description
8110 Request for examination paragraph 44
8125 Change of the main classification
8131 Rejection