AU714731B2 - Methods of removing gaseous elementary mercury from raw gases in two successive stages - Google Patents

Methods of removing gaseous elementary mercury from raw gases in two successive stages Download PDF

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Publication number
AU714731B2
AU714731B2 AU20275/97A AU2027597A AU714731B2 AU 714731 B2 AU714731 B2 AU 714731B2 AU 20275/97 A AU20275/97 A AU 20275/97A AU 2027597 A AU2027597 A AU 2027597A AU 714731 B2 AU714731 B2 AU 714731B2
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AU
Australia
Prior art keywords
washing
washing tower
raw
gases
acid
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
AU20275/97A
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AU2027597A (en
Inventor
Paul Gocht
Klaus Hasselwander
Horst Schade
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.)
GEA Group AG
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Metallgesellschaft AG
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Filing date
Publication date
Application filed by Metallgesellschaft AG filed Critical Metallgesellschaft AG
Publication of AU2027597A publication Critical patent/AU2027597A/en
Application granted granted Critical
Publication of AU714731B2 publication Critical patent/AU714731B2/en
Anticipated expiration legal-status Critical
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
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/77—Liquid phase processes
    • B01D53/78—Liquid phase processes with gas-liquid contact
    • 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
    • B01D53/64—Heavy metals or compounds thereof, e.g. mercury
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/50—Inorganic acids

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

Description

Translation of amended pages 1, 3, 4, (5 deleted), 7 and 8 of the English translation of PCT/EP97/01304 METALLGESELLSCHAFT
AG
Reuterweg 14 60323 Frankfurt Case No.: 95 00 58 Methods of removing gaseous elementary mercury from raw gases in two successive stages Description This invention relates to a method of removing gaseous S elementary mercury from raw gases in two successive stages, wherein the raw gases are passed through a washing tower from bottom to top and are brought in contact with a washing acid in the washing tower flowing countercurrent and which is introduced and circulated at the top of the washing tower via a system of nozzles.
Methods of cleaning gases, which contain gaseous elementary SS mercury, are known. The DE-A-32 13 685 describes a method and device for removing mercury from hot and humid gases containing sulfur dioxide, which proposes to withdraw part of the circulating washing acid from the circuit and spray the same into the raw gas line. The required throughput of washing acid is thus split and divided over two feeding points. The DE-OS 22 07 851 describes a method of cleaning gases that contain gaseous elementary mercury, in which the gases are brought in contact with a washing solution in a washing tower.
This method uses a washing solution that contains mercury (II) ions at quantities between 0.02 g/l and saturation, and contains at least one of the ions of the group I _II 2 2- Cl-, Br J and SO42 which form partly soluble Hg(I) salts or Hg(I) salts with low solubility, where Cl-, Br-, J- and SO 4 2 are present at such a quantity that the formed Hg(I) is precipitated, but the corresponding Hg(I) salts are not illproportioned so as to form Hg(II) and Hgo.
The method is based upon the following chemical reactions: Hgo HgCl2(liq) 4 Hg 2 Cl 2 (sol) (calomel) (1) 2 HgCl 2
SO
2
H
2 0 Hg 2 Cl 2
SO
3 2 HC1 (2) Hgo Hg(C1 4 2 Hg 2 C1 2 2 Cl (3) Hgo HgClnn 2 Hg 2 Cl 2 (n-2)Cl- (4) Hg 2 Cl 2 C1 2 2 Cl- 4 HgC1 4 2 (chlorination of calomel) The washing solution is introduced into the top of the washing tower via a system of nozzles. This method has the disadvantage that a pressure between 0.5 and 1 bar must be set at the top of the washing tower. This leads to the formation of relatively fine mists in the direct vicinity of the nozzle system, and elementary mercury is applied to said mists, which is discharged together with the pure gas from the washing tower.
It is therefore the objective of the invention to create a method of removing gaseous elementary mercury from raw gases in two successive stages that avoids the introduction of fine mists, loaded with mercury, into the pure gas line.
Furthermore, the method should be such that it can be applied to existing plants as they are known from DE-OS 22 07 851 without any major plant alterations.
3 The objective of the invention is met in that, in addition to the circulating amount of washing acid, washing acid is injected at a pressure between 1 and 5 bar into the raw gas line that is connected to the washing tower. A pressure between 0.01 and 0.5 bar is set at the top of the washing tower. The term "raw gases" designates those gases that contain elementary mercury, such as waste gases produced during roasting of mercury-containing mineral substances, in chlorine-alkali processes or in the regeneration of certain mercury-containing catalysts. The washing acid used may be a liquid that is described in DE-OS 22 07 851 as a washing solution. The top of the washing tower is understood to be the upper part of the washing tower that is connected to the pure gas line. The raw gases are supplied to the bottom of the S* washing tower through the raw gas line. The washing acid can be injected into the raw gas line by means of different types of nozzle systems. Nevertheless, the individual nozzles are to be arranged such that the washing acid is injected over more or less the entire flow cross-section of the raw gas line. The surprising result of this method for removing gaseous elementary mercury from raw gases was that the formation of fine mists of loaded washing acid at the top of the washing tower can be avoided. This improves the degree of separation since no mist loaded with elementary mercury is introduced into the pure gas. Moreover, the method can be integrated relatively easily into already existing plants since the raw gas line of the already existing plant requires only the fitting of a connection for the washing acid used. It is furthermore advantageous that a separation of the gaseous elementary mercury of up to 90% from the raw gases is achieved in the first stage in the raw gas line before the raw gases reach the washing tower in the second stage.
4 A preferred embodiment of the invention is that the pressure set at the top of the washing tower is between 0.1 and 0.2 bar. At this pressure droplets of washing acid of almost identical diameter are formed at the top of the washing tower.
This has an advantageous effect on the separation of the gaseous elementary mercury.
C o* (The next page with text is page 6) EDITORIAL NOTE No. 20275/97 This specification does not contain a page numbered 6 The invention is subsequently explained in detail and by way of example with reference to the drawing (Fig.).
The Figure shows a simplified schematic representation of the plant used to implement the method according to the invention.
The method according to the invention is shown schematically in the Figure. The raw gases flow through the raw gas line 1 towards the bottom of the washing tower. In the washing tower 2 the raw gases are brought into contact with the washing acid, which is introduced into the washing tower 2 at the top 2' of the washing tower 2. Represented is the method in which the washing acid is introduced via a nozzle system 10. A pressure between 0.01 and 0.5 bar is set at the top 2' of the washing tower 2. The washing acid collected at the bottom of the washing tower 2 flows through line 7 into the receiver 4.
From the receiver 4 the washing acid is delivered via line 3 and the first pump 5 to the top 2' of the washing tower 2.
Additional washing acid is injected into the raw gas line 1 via line 8 and the second pump 11 from the receiver 4. The injection of additional washing acid into the raw gas line 1 achieves a separation of the gaseous elementary mercury from the raw gases of up to 90% before the raw gases reach the washing tower 2. Clean washing acid is introduced into receiver 4 via line 9 in intervals of several hours. The pure gas is discharged from the washing tower 2 via the pure gas line 6.

Claims (2)

1. A method of removing gaseous elementary mercury from raw gases in two successive stages, wherein the raw gases are passed through a washing tower from the bottom to the top and in the washing tower are countercurrently brought in contact with a washing acid, and the washing acid is introduced and circulated in the top of the washing tower via a nozzle system characterized in that into the raw gas line, which is connected with the washing tower, washing acid is injected at a pressure of 1 to 5 bar in addition to the circulating amount of washing acid, and in the top of the washing tower a pressure of 0.01 to 0.5 bar is adjusted. *S o
2. The method as claimed in claim 1, characterized in that the pressure adjusted in the top of the washing tower is 0.1 to 0.2 bar. t. 9
AU20275/97A 1996-03-16 1997-03-14 Methods of removing gaseous elementary mercury from raw gases in two successive stages Ceased AU714731B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE1996110444 DE19610444C1 (en) 1996-03-16 1996-03-16 Removing gaseous elemental mercury@ from crude gas
DE19610444 1996-03-16
PCT/EP1997/001304 WO1997034683A1 (en) 1996-03-16 1997-03-14 Methods of removing gaseous elementary mercury from gases in two successive stages

Publications (2)

Publication Number Publication Date
AU2027597A AU2027597A (en) 1997-10-10
AU714731B2 true AU714731B2 (en) 2000-01-13

Family

ID=7788535

Family Applications (1)

Application Number Title Priority Date Filing Date
AU20275/97A Ceased AU714731B2 (en) 1996-03-16 1997-03-14 Methods of removing gaseous elementary mercury from raw gases in two successive stages

Country Status (5)

Country Link
EP (1) EP0888167A1 (en)
AU (1) AU714731B2 (en)
CA (1) CA2247997A1 (en)
DE (1) DE19610444C1 (en)
WO (1) WO1997034683A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE9701947L (en) * 1997-05-26 1998-05-04 Boliden Contech Ab Process for separating gaseous elemental mercury from a gas
CN104524952B (en) * 2015-01-13 2016-08-31 崔涛 A kind of fume treatment auxiliary

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3838190A (en) * 1971-01-14 1974-09-24 Norske Zinkkompani As Process for the removal of mercury from gases
US3849537A (en) * 1971-02-23 1974-11-19 Boliden Ab Method of purifying gases containing mercury vapour
US4579726A (en) * 1981-04-15 1986-04-01 Outokumou Oy Process and apparatus for the removal of mercury from sulfur dioxide-bearing hot and moist gases

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE786216A (en) * 1971-07-14 1973-01-15 Basf Ag MERCURY AND GAS SEPARATION PROCESS
SE396772B (en) * 1975-09-16 1977-10-03 Boliden Ab PROCEDURE FOR EXTRACTION AND EXTRACTION OF MERCURES FROM GASES
SE439153B (en) * 1982-12-03 1985-06-03 Boliden Ab PROCEDURES FOR THE PRODUCTION OF SULFURIC ACID FROM SULFUR Dioxide-containing gas CONSUMPTION FROM TREATMENT OF MERCURY SILVER-CONTAINING RAW PRODUCTS AND INTERMEDIATES
DE4315138C1 (en) * 1993-05-07 1994-07-21 Thyssen Industrie Mercury removed from incinerated sludge waste gases by washing first with alkaline solution and then with aqueous acid solution

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3838190A (en) * 1971-01-14 1974-09-24 Norske Zinkkompani As Process for the removal of mercury from gases
US3849537A (en) * 1971-02-23 1974-11-19 Boliden Ab Method of purifying gases containing mercury vapour
US4579726A (en) * 1981-04-15 1986-04-01 Outokumou Oy Process and apparatus for the removal of mercury from sulfur dioxide-bearing hot and moist gases

Also Published As

Publication number Publication date
CA2247997A1 (en) 1997-09-25
EP0888167A1 (en) 1999-01-07
DE19610444C1 (en) 1997-05-07
WO1997034683A1 (en) 1997-09-25
AU2027597A (en) 1997-10-10

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MK14 Patent ceased section 143(a) (annual fees not paid) or expired