EP0184342B1 - Destruction de composés organiques halogénés - Google Patents

Destruction de composés organiques halogénés Download PDF

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Publication number
EP0184342B1
EP0184342B1 EP85308218A EP85308218A EP0184342B1 EP 0184342 B1 EP0184342 B1 EP 0184342B1 EP 85308218 A EP85308218 A EP 85308218A EP 85308218 A EP85308218 A EP 85308218A EP 0184342 B1 EP0184342 B1 EP 0184342B1
Authority
EP
European Patent Office
Prior art keywords
metal
compounds
destroyed
aluminium
containing organic
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.)
Expired
Application number
EP85308218A
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German (de)
English (en)
Other versions
EP0184342A1 (fr
Inventor
Robert Anderson Ross
Rejean Lemay
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.)
Rio Tinto Alcan International Ltd
Original Assignee
Alcan International Ltd Canada
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 Alcan International Ltd Canada filed Critical Alcan International Ltd Canada
Priority to AT85308218T priority Critical patent/ATE40528T1/de
Publication of EP0184342A1 publication Critical patent/EP0184342A1/fr
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Publication of EP0184342B1 publication Critical patent/EP0184342B1/fr
Expired legal-status Critical Current

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Classifications

    • AHUMAN NECESSITIES
    • A62LIFE-SAVING; FIRE-FIGHTING
    • A62DCHEMICAL MEANS FOR EXTINGUISHING FIRES OR FOR COMBATING OR PROTECTING AGAINST HARMFUL CHEMICAL AGENTS; CHEMICAL MATERIALS FOR USE IN BREATHING APPARATUS
    • A62D3/00Processes for making harmful chemical substances harmless or less harmful, by effecting a chemical change in the substances
    • A62D3/30Processes for making harmful chemical substances harmless or less harmful, by effecting a chemical change in the substances by reacting with chemical agents
    • A62D3/37Processes for making harmful chemical substances harmless or less harmful, by effecting a chemical change in the substances by reacting with chemical agents by reduction, e.g. hydrogenation
    • AHUMAN NECESSITIES
    • A62LIFE-SAVING; FIRE-FIGHTING
    • A62DCHEMICAL MEANS FOR EXTINGUISHING FIRES OR FOR COMBATING OR PROTECTING AGAINST HARMFUL CHEMICAL AGENTS; CHEMICAL MATERIALS FOR USE IN BREATHING APPARATUS
    • A62D2101/00Harmful chemical substances made harmless, or less harmful, by effecting chemical change
    • A62D2101/20Organic substances
    • A62D2101/22Organic substances containing halogen

Definitions

  • PCB's Polychlorinated biphenyls
  • PCB's are non- conductors of electricity and have good resistance to high temperatures, so they are widely used as working fluids in heat exchangers and hydraulic systems and by the electrical industry in transformers and capacitors.
  • PCB's are extremely toxic, but are difficult to destroy on account of their thermal stability and chemical inertness.
  • the standard destruction method involves incineration at temperatures around 1500°C, but suffers from several disadvantages. Operation at these very high temperatures is expensive; and incomplete combustion can give rise to chlorinated dioxins or furans which are even more toxic than PCB's.
  • the present invention provides a method for the destruction of PCB's and related compounds which involves reaction with metal rather than combustion, and operates at much lower temperatures.
  • Shultz discloses as a non preferred embodiment, but does not claim, a process which involves contacting PCB's with a solid aluminium surface.
  • his experiments involved heating transformer oils containing PCB's in the presence of aluminium foil at various temperatures, but did not result in complete destruction of the PCB's even over periods as long as 30 minutes.
  • Japanese Kokai 51-25471 describes a method of decomposing PCB's by heating them to effect partial dissociation to HCI OR CI 2 , and passing the mixture over a suitable metal and recovering a chloride salt of the metal by sublimation from the decomposition system. There is no indication that air is excluded; and no evidence that complete decomposition of PCB's is achieved even after several hours reaction.
  • the invention is based on the discovery that PCB's can be rapidly destroyed by heating in the presence of solid aluminium, but only provided certain critical parameters are observed.
  • the invention thus provides a method of destroying halogen-containing organic compounds by reaction with a metal in the solid state at elevated temperature, characterized by contacting the compounds in gaseous form in the absence of oxygen with a metal selected from AI, Mg, Si, Ti and Be, an alloys thereof having a specific surface area in the range of from 0.1 to 65 m 2 of active metal surface per gram of compound to be destroyed and at a temperature of at least 450°C and for a contact time of up to 50 seconds, whereby the halogen-containing organic compounds are destroyed and a deactivating carbonaceous deposit is formed on the surface of the metal.
  • the compounds are preferably entrained in an inert carrier gas, for example argon or other gas in group 0 of the periodic table.
  • an inert carrier gas for example argon or other gas in group 0 of the periodic table.
  • High purity nitrogen may also be used, and is regarded for this purpose as an inert gas.
  • nitrogen is known to form highly toxic compounds with PCB's but the concetra- tions so far observed of these are insignificant.
  • concentration of the compounds in carrier gas is preferably from 10 ppm up to 10%.
  • metals that can be used for reaction with the compounds are specified Al, Mg, Si, Ti and Be, and alloys of these metals with each other or with minor proportions of other metals.
  • the five named metals have two characteristics in common: they form oxides having electically insulating properties; and the oxides have high thermal and chemical stability.
  • Berylium presents a toxicity problem in itself, and is on that account the least preferred.
  • the most preferred metals are magensium and, particularly, aluminium.
  • the metals can be used in the natural state, i.e. without the need to remove any oxide film that may be present.
  • Aluminium can be used having an anodic oxide film which may contain minor proportions of oxides of other metals such as Co, Ni, Sn, Cu etc., in the pores. It is not known with certainty whether any oxide film remains during operation of the method, or whether it is removed by reaction with halogen-containing organic compounds.
  • the metal can be used in any physical form in which is has a high specific surface area. Suitable forms include a packed bed of spheres, chips or granules, a fluidized bed of powder, honeycomb, wire mesh or wire wool. Our presently preferred material is scrap aluminium and alloys thereof in granulated form, because this is cheap and readily obtainable. Sufficient metal surface area should be provided to ensure rapid and complete destruction of the halogen-containing organic compounds. This is generally 0.1 to 65 m 2 , preferably from 1 to 20 m 2 , of active metal surface (not necessarily bare metal surface, but surface not coated with e.g. inactivating carbonaceous deposits) per gram, of compound to be destroyed.
  • reaction temperature needs to be at least 450°C.
  • An upper limit on temperature is set by the melting point of the metal being used.
  • One of the advantages of the method of this invention is the low temperature required, and it is preferred not to use higher temperatures than are necessary in orderto achieve reaction at the desired rate. Depending on other conditions, preferred reaction temperatures are likely to lie in the range 550°C to 650°C.
  • Reaction products resulting from the method appear to be metal halide (e.g. aluminium chloride), low-boiling hydrocarbons, halogen, (e.g. chlorine) and carbon deposited on the metal substrate.
  • metal halide e.g. aluminium chloride
  • low-boiling hydrocarbons e.g. carbon
  • halogen e.g. chlorine
  • carbon deposited on the metal substrate As a result of this deposition, the substrate gradually becomes inactive. When this happens, the substrate can be regenerated. With aluminium, this can be achieved by subjecting the metal to sodium hydroxide solution, or less preferably, by heating the metal in air to burn off the carbon deposits.
  • Other treatments for regenerating aluminium involve exposing the carbonised surface:
  • Hydrogen and chlorine may be diluted with flowing argon.
  • treatment (a) is preferred. It seems possible that the regenerated surface is in some way "re-activated" by the chlorine. Using this treatment, a 79.7% recovery of usable surface was obtained.
  • Treatment (b) is more preferred than (c).
  • Other metal substrates can similarly be regenerated by removing the carbon deposits under conditions in which the substrate is not effected.
  • the metal used was 1100 aluminium alloy chips (0.5 x 0.5 x 0.1 cm). A bed about 27 cm long of these chips was positioned in a vertical quartz tube 1.8 cm outside diameter, and maintained at a nominal temperature of 580°C. A vessel containing the reactant was positioned in the quartz tube below the bed, and was surrounded by a separate tube furnace whose temperature was raised from ambient to 600°C over a period of 60 minutes. The lower end of the quartz tube was closed except for an inlet port through which argon carrier gas was passed at a flow rate of 87.7 ml/min (NTP). As the reactant heated up it vapourized and became entrained in the carrier gas.
  • NTP argon carrier gas
  • the flow rate was such that the residence time of the gas in the bed of aluminium chips was about 15 seconds.
  • the temperature profile of the bed of chips was measured as 366°C at 0 cm up from the bottom; 473°C at 5 cm; 563°C at 9 cm; 601°C at 16 cm and 600°C at 27 cm.
  • the top end of the quartz tube was closed except for a gas outlet, and the reaction products were condensed. After the experiment, any remaining reactant, the material in the bed of aluminium chips and the reaction products were all analysed for halogen-containing organic compounds.
  • the reactant was 0.0078 g of decachlorobiphenyl.
  • the destruction efficiency was 99.9999%.
  • the section from 14 to 24 cm (measured from the bottom) of the aluminium bed became black.
  • the rate of heating of the reactant sample was varied so that the concentration of decachlorobiphenyl in carrier argon gas ranged from 166 ppm to 3048 ppm. In all cases, the destruction efficiency was at least 99.999%.

Landscapes

  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Fire-Extinguishing Compositions (AREA)
  • Treating Waste Gases (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)

Claims (9)

1. Procédé de destruction de composés organiques halogénés par réaction avec un métal à l'état solide à température élevée, caractérisé par le contact des composés sous forme gazeuse en l'absence d'oxygène avec un métal choisi parmi AI, Mg, Si, Ti et Be et leurs alliages ayant une surface spécifique dans la gamme de 0,1 à 65 m2 de surface de métal actif par gramme de composé à détruire et à une température d'au moins 450°C pendant un temps de contact pouvant atteindre 50 secondes, pour que les composés organiques halogénés soient détruits et qu'il se forme un dépôt carboné désactivateur sur la surface du métal.
2. Procédé selon la revendication 1, dans lequel les composés organiques sont des hydrocarbures chlorés.
3. Procédé selon la revendication 2, dans lequel les hydrocarbures chlorés sont mis au contact du métal à une température de 450°C pendant un temps de contact de 0,1 à 50 secondes, si bien que les hydrocarbures chlorés sont détruits et qu'un dépôt carboné désactivateur se forme sur la surface du métal, le procédé comprenant de plus les stades de:
i) régénération de la surface métallique par élimination du dépôt carboné de celle-ci, et
ii) réutilisation du métal ayant une surface régenérée pour détruire une quantité complémentaire d'hydrocarbures chlorés.
4. Procédé selon l'une quelconque des revendications 1 à 3, dans lequel les composés sont entraînés sous une forme gazeuse dans un gaz porteur inerte.
5. Procédé selon l'une quelconque des revendications 1 à 4, dans lequel le métal avec lequel les composés à détruire sont mis au contact est constitué de fragments d'alliages d'aluminium.
6. Procédé selon l'une quelconque des revendications 1 à 5, dans lequel la température de contact est de 550°C à 650°C.
7. Procédé selon l'une quelconque des revendications 1 à 6, dans lequel il existe de 1 à 20 m2 de surface de métal actif par gramme de composé à détruire.
8. Procédé selon la revendication 3, dans lequet le métal est régénéré par traitement avec une solution d'hydroxyde de sodium.
9. Procédé selon la revendication 3, dans lequel le métal est régénéré par exposition à une température élevée à l'action de l'oxygène puis du chlore.
EP85308218A 1984-11-23 1985-11-12 Destruction de composés organiques halogénés Expired EP0184342B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85308218T ATE40528T1 (de) 1984-11-23 1985-11-12 Vernichtung halogen enthaltender organischer verbindungen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB848429709A GB8429709D0 (en) 1984-11-23 1984-11-23 Halogen-containing organic compounds
GB8429709 1984-11-23

Publications (2)

Publication Number Publication Date
EP0184342A1 EP0184342A1 (fr) 1986-06-11
EP0184342B1 true EP0184342B1 (fr) 1989-02-01

Family

ID=10570205

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85308218A Expired EP0184342B1 (fr) 1984-11-23 1985-11-12 Destruction de composés organiques halogénés

Country Status (11)

Country Link
EP (1) EP0184342B1 (fr)
JP (1) JPS61137831A (fr)
AT (1) ATE40528T1 (fr)
AU (1) AU586840B2 (fr)
BR (1) BR8505887A (fr)
CA (1) CA1258682A (fr)
DE (1) DE3568009D1 (fr)
ES (1) ES8704867A1 (fr)
GB (1) GB8429709D0 (fr)
IN (1) IN165170B (fr)
NO (1) NO163265C (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3623492A1 (de) * 1986-07-11 1988-01-21 Hagenmaier Hans Paul Verfahren zum abbau von halogenierten aromaten
US5276250A (en) * 1986-07-11 1994-01-04 Hagenmaier Hans Paul Process for decomposing polyhalogenated compounds
GB8813270D0 (en) * 1988-06-04 1988-07-06 Plasma Products Ltd Dry exhaust gas conditioning
DE3820317A1 (de) * 1988-06-15 1989-12-21 Christian O Schoen Verfahren zum zerlegen schaedliche oder umweltbelastende bestandteile enthaltender fliessfaehiger organischer medien
DE3932927A1 (de) * 1989-10-03 1991-04-18 Hansjoerg Prof Dr Sinn Verfahren zur entfernung von organohalogenverbindungen aus kohlenwasserstoffgemischen, insbesondere aus pyrolyseprodukten in gasphase
US5141629A (en) * 1990-05-15 1992-08-25 State Of Israel, Atomic Energy Commission Process for the dehalogenation of organic compounds
US5490919A (en) * 1990-08-14 1996-02-13 State Of Isreal, Atomic Energy Commission Process for the dehalogenation of organic compounds
LU90191A7 (de) * 1997-07-23 1999-06-24 Pac Holdings S A Verfahren zur entsorgung von halogenierten und nicht halogenierten abfallstoffen
EP0937483B1 (fr) * 1998-02-10 2003-09-24 Miyoshi Yushi Kabushiki Kaisha Procédé de traitement de déchets solides
RU2200602C1 (ru) * 2001-10-22 2003-03-20 Федеральное государственное унитарное предприятие "Государственный научно-исследовательский институт органической химии и технологии" СПОСОБ УНИЧТОЖЕНИЯ ЛЮИЗИТА (β-ХЛОРВИНИЛДИХЛОРАРСИН)
JP4954133B2 (ja) * 2008-03-31 2012-06-13 本田技研工業株式会社 オイル通路構造

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2346562A (en) * 1940-11-07 1944-04-11 Dow Chemical Co Method of removing carbonized oil residue from magnesium articles
FR1190669A (fr) * 1957-12-03 1959-10-14 Pechiney Fabrication de dérivés organiques de l'aluminium
US2977323A (en) * 1958-07-14 1961-03-28 Phillips Petroleum Co Process for reactivating used cracking catalysts
US3343911A (en) * 1964-02-20 1967-09-26 Pittsburgh Plate Glass Co Production of aluminum trichloride
US3481877A (en) * 1967-02-27 1969-12-02 Amchem Prod Cleaning solution concentrate and method of preparing same
JPS5125471A (en) * 1974-08-28 1976-03-02 Arita Kenkyusho Kk Horienkabifueniiru no bunkaiho
JPS5729313A (en) * 1980-07-28 1982-02-17 Hideo Koga Suprort for bedding
US4469661A (en) * 1982-04-06 1984-09-04 Shultz Clifford G Destruction of polychlorinated biphenyls and other hazardous halogenated hydrocarbons
US4447262A (en) * 1983-05-16 1984-05-08 Rockwell International Corporation Destruction of halogen-containing materials

Also Published As

Publication number Publication date
IN165170B (fr) 1989-08-19
JPS61137831A (ja) 1986-06-25
ES8704867A1 (es) 1987-04-16
NO163265B (no) 1990-01-22
EP0184342A1 (fr) 1986-06-11
ATE40528T1 (de) 1989-02-15
NO163265C (no) 1990-05-02
DE3568009D1 (en) 1989-03-09
CA1258682A (fr) 1989-08-22
AU586840B2 (en) 1989-07-27
BR8505887A (pt) 1986-08-12
ES549182A0 (es) 1987-04-16
GB8429709D0 (en) 1985-01-03
AU5035385A (en) 1986-05-29
NO854693L (no) 1986-05-26

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