EP0170808A1 - Process for removing polychlorinated biphenyl (PCB) from electrically insulating fluids - Google Patents

Process for removing polychlorinated biphenyl (PCB) from electrically insulating fluids Download PDF

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Publication number
EP0170808A1
EP0170808A1 EP85106477A EP85106477A EP0170808A1 EP 0170808 A1 EP0170808 A1 EP 0170808A1 EP 85106477 A EP85106477 A EP 85106477A EP 85106477 A EP85106477 A EP 85106477A EP 0170808 A1 EP0170808 A1 EP 0170808A1
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Prior art keywords
pcb
polychlorobiphenylene
insulating
insulating liquid
freed
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EP85106477A
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German (de)
French (fr)
Inventor
Heinrich Bender
Dieter Reinartz
Günther Laurent
Adolf Böhm
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Didier Werke AG
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Didier Werke AG
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
    • H01B3/46—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes silicones
    • H01B3/465—Silicone oils
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
    • C10G21/00—Refining of hydrocarbon oils, in the absence of hydrogen, by extraction with selective solvents
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
    • C10G21/00—Refining of hydrocarbon oils, in the absence of hydrogen, by extraction with selective solvents
    • C10G21/006—Refining of hydrocarbon oils, in the absence of hydrogen, by extraction with selective solvents of waste oils, e.g. PCB's containing oils
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/20—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances liquids, e.g. oils
    • H01B3/24—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances liquids, e.g. oils containing halogen in the molecules, e.g. halogenated oils

Definitions

  • the invention relates to a method for removing polychlorobiphenyls (PCB) from electrical insulating liquids when replacing PCB oils with other insulating liquids, in particular silicone oils.
  • PCB polychlorobiphenyls
  • a main area of application for chlorinated biphenyls which are also referred to in the following as PCB, is the use as insulating liquids or cooling liquids in the so-called ascarels, which are flame-retardant electrical insulating liquids that do not generate flammable or explosive gases in electric arcs.
  • ascarels are widely used as transformer insulation fluids.
  • PCBs can release the highly toxic, chlorinated dibenzofurans or dibenzodioxins at higher temperatures.
  • PCB in systems from which no PCB can normally escape, such as on electrical devices such as transformers, chokes, capacitors, etc.
  • the object of the invention is a process for the removal of polychlorobiphenyls from electrical insulating liquids, in particular silicone or mineral oils, which makes it possible to obtain a PCB-free, reusable insulating liquid in an economical manner, the polychlorobiphenyls subsequently being obtained in concentrated form, so that, for example, a Disposal by incineration in a special oven becomes possible without difficulty.
  • the method according to the invention which is based on the extraction of the polychlorobiphenyls from the electrical insulating liquid with a solvent for polychlorobiphenyls which is immiscible with this insulating liquid, serves to achieve this object.
  • Lower alcohols for example methanol, are very suitable as liquid extractants, and lower alcohols are to be understood as meaning C 1 -C 4 -alkanols.
  • the extractant After intensive contact with the liquids, the extractant is separated.
  • the extraction can be carried out continuously or batchwise in several steps in the customary and known extraction apparatus.
  • electrical insulating liquids is understood to mean all insulating liquids or ascareles which do not contain or do not contain PCB.
  • the extractant enriched with PCB is separated from it by distillation and can then be used again for extraction.
  • the preparation should take place at a few central points in order to enable the extraction and distillation apparatus to be economically dimensioned and to ensure that the process is carried out in a technically perfect manner.
  • the number of extraction steps until complete PCB removal from the insulating liquid can be reduced by adding an additional adsorption stage.
  • the contaminated transformers are emptied, filled with fresh insulating liquid and the contaminated insulating liquids are then extracted.
  • the downtimes of the transformer can be kept as low as possible.
  • the insulating liquid treated with the extractant can still contain traces of the corresponding solvent. These can be dampened by higher temperatures or in a vacuum, although small residual quantities have no negative impact on the functioning of the transformer.
  • old transformers can be recycled.
  • a large number of old transformers are connected to one another at a central point, for example with pipes, and filled with an insulating liquid that is pumped around in the circuit.
  • the transformer can be loaded electrically, whereby the insulating liquid heats up.
  • This new procedure in contrast to one Direct treatment of the transformers with solvents largely precludes a fire or environmental hazard.
  • the invention is illustrated by the following example.
  • transformer insulating liquid silicone oil with 6000 ppm PCB
  • the diagram in the figure shows the dependence of the PCB concentration in the silicone oil on the selection of the extraction steps.

Abstract

Polychlorobiphenylene (PCB) is removed from electroinsulating fluids during replacement of PCB oils by other insulating fluids, in particular silicone oils, by bringing the insulating fluid into contact with a liquid extractant for polychlorobiphenyls and then separating off the extractant from the insulating fluid. The advantage of the process according to the invention is that electroinsulating fluid enriched with polychlorobiphenylene can be reused and furthermore that even transformers contaminated with PCB can be purified in this manner and thus become suitable for scrapping.

Description

Die Erfindung betrifft ein Verfahren zur Entfernung von Polychlorbiphenylen (PCB) aus Elektroisolierflüssigkeiten beim Ersatz von PCB-Ölen durch andere Isolierflüssigkeiten, insbesondere Silikonöle.The invention relates to a method for removing polychlorobiphenyls (PCB) from electrical insulating liquids when replacing PCB oils with other insulating liquids, in particular silicone oils.

Ein Hauptanwendungsgebiet für chlorierte Biphenyle, welche im folgenden auch abgekürzt PCB bezeichnet werden, ist die Verwendung als Isolierflüssigkeiten bzw. Kühlflüssigkeiten in den sogenannten Askarelen, worunter man flammwidrige Elektroisolier-Flüssigkeiten versteht, die in elektrischen Lichtbögen weder brennbare noch explosive Gase entwickeln. Solche Askarele sind als Transformatorisolierflüssigkeiten weit verbreitet im Einsatz.A main area of application for chlorinated biphenyls, which are also referred to in the following as PCB, is the use as insulating liquids or cooling liquids in the so-called ascarels, which are flame-retardant electrical insulating liquids that do not generate flammable or explosive gases in electric arcs. Such ascarels are widely used as transformer insulation fluids.

Allerdings wurde Ende der 60er-Jahre bekannt, daß besonders die höher chlorierten Biphenyle schwer abbaubar, bioakkumulierbar und somit ökologisch sehr bedenklich sind.However, it became known at the end of the 1960s that the more chlorinated biphenyls in particular are difficult to degrade, bioaccumulative and therefore very ecologically unsafe.

Fernerhin besteht die Möglichkeit, daß aus PCB bei höheren Temperaturen die hochtoxischen, chlorierten Dibenzofurane bzw. Dibenzodioxine freiwerden.Furthermore, there is the possibility that PCBs can release the highly toxic, chlorinated dibenzofurans or dibenzodioxins at higher temperatures.

Deshalb wurde die Verwendung von PCB in der Bundesrepublik Deutschland gemäß der 10. Verordnung zur Durchführung des Bundes-Immissionsschutzgesetzes vom 26. Juli 1978 nur für bestimmte Anwendungsgebiete zugelassen.For this reason, the use of PCB in the Federal Republic of Germany was only permitted for certain areas of application in accordance with the 10th Ordinance for the Implementation of the Federal Immission Control Act of July 26, 1978.

Hierzu gehört unter anderem die Verwendung von PCB in Systemen, aus denen normalerweise kein PCB entweichen kann, wie zum Beispiel auf elektrische Vorrichtungen wie Transformatoren, Drosseln, Kondensatoren, usw.This includes the use of PCB in systems from which no PCB can normally escape, such as on electrical devices such as transformers, chokes, capacitors, etc.

Trotzdem besteht heute die Tendenz, askarelgefüllte Transformatoren entweder komplett auszutauschen oder zumindest die Isolierflüssigkeit durch umweltfreundliche Produkte, zum Beispiel Silikonöl, zu ersetzen.Nevertheless, there is a tendency today to either completely replace askarel-filled transformers or at least to replace the insulating liquid with environmentally friendly products, for example silicone oil.

Hierbei hat es sich jedoch herausgestellt, daß der Ersatz von PCB-ölen durch andere Transformatorisolierflüssigkeiten gar nicht so einfach ist, da die restlose Entfernung von PCB-öl aus einem solchen Transformator praktisch unmöglich ist, selbst wenn der Transformator abgebaut wird und nach dem Transport zu einer entsprechenden Umfüllanlage dort gründlich gereinigt wird. Im Laufe der Zeit treten die unvermeidlich in Transformatoren bzw. deren Bauteilen verbliebenenPCB-Restölmengen in die neue Transformator-isolierflüssigkeit ein, so daß nach einiger Zeit Gehalte bis zu 10 Vol.-% an PCB-öl in der neuen Transformatorisolierflüssigkeit vorliegen.However, it has been found here that the replacement of PCB oils with other transformer insulating liquids is not so easy, since the complete removal of PCB oil from such a transformer is practically impossible, even if the transformer is dismantled and closed after transportation an appropriate transfer system is thoroughly cleaned there. Over time, the residual PCB quantities inevitably remaining in transformers or their components enter the new transformer insulating liquid, so that after some time contents of up to 10% by volume of PCB oil are present in the new transformer insulating liquid.

Hierdurch wird ein erneuter, eventuell sogar mehrmaliger Austausch der Isolierflüssigkeit erforderlich, wobei die Entsorgung des PCB-kontaminierten Silikonöls naturgemäß problematisch ist. Es sind Verfahren bekannt geworden, die es ermöglichen, PCB-Verunreinigungen aus der ausgetauschten Transformatorflüssigkeit durch Adsorption zu entfernen.As a result, the insulating liquid has to be replaced again, possibly even several times, whereby the disposal of the PCB-contaminated silicone oil is naturally problematic. Methods have become known which make it possible to remove PCB contaminants from the exchanged transformer liquid by adsorption.

Aufgabe der Erfindung ist ein Verfahren zur Entfernung von Polychlorbiphenylen aus Elektroisolierflüssigkeiten, insbesondere Silikon- oder Mineralölen, welches es erlaubt, auf wirtschaftliche Weise eine PCB-freie, wiederverwendbare Isolierflüssigkeit zu erhalten, wobei die Polychlorbiphenyle anschließend in konzentrierter Form anfallen, so daß zum Beispiel eine Entsorgung durch Verbrennung in einem Spezialofen ohne Schwierigkeiten möglichkeit wird.The object of the invention is a process for the removal of polychlorobiphenyls from electrical insulating liquids, in particular silicone or mineral oils, which makes it possible to obtain a PCB-free, reusable insulating liquid in an economical manner, the polychlorobiphenyls subsequently being obtained in concentrated form, so that, for example, a Disposal by incineration in a special oven becomes possible without difficulty.

Zur Lösung dieser Aufgabe dient das erfindungsgemäße Verfahren, welches auf der Extraktion der Polychlorbiphenyle aus der Elektroisolierflüssigkeit mit einem, mit dieser Isolierflüssigkeit nicht mischbaren Lösungsmittel für Polychlorbiphenyle beruht.The method according to the invention, which is based on the extraction of the polychlorobiphenyls from the electrical insulating liquid with a solvent for polychlorobiphenyls which is immiscible with this insulating liquid, serves to achieve this object.

Als flüssige Extraktionsmittel sind niedere Alkohole, zum Beispiel Methanol, sehr gut geeignet.Unter niederen Alkoholen sind Ci-c 4-Alkanole zu verstehen.Lower alcohols, for example methanol, are very suitable as liquid extractants, and lower alcohols are to be understood as meaning C 1 -C 4 -alkanols.

Nach intensiver Kontaktierung der Flüssigkeiten wird das Extraktionsmittel abgetrennt.After intensive contact with the liquids, the extractant is separated.

Die Extraktion kann kontinuierlich oder diskontinuierlich in mehreren Schritten in den üblichen und bekannten Extraktionsapparaten durchgeführt werden.The extraction can be carried out continuously or batchwise in several steps in the customary and known extraction apparatus.

Unter dem Ausdruck "Elektroisolierflüssigkeiten" sind in der vorliegenden Beschreibung alle Isolierflüssigkeiten oder Askarele zu verstehen, welche kein PCB enthalten oder nicht hieraus bestehen.In the present description, the term “electrical insulating liquids” is understood to mean all insulating liquids or ascareles which do not contain or do not contain PCB.

Das mit PCB angereicherte Extraktionsmittel wird durch Destillation von diesem abgetrennt und kann anschließend erneut zur Extraktion eingesetzt werden.The extractant enriched with PCB is separated from it by distillation and can then be used again for extraction.

Die Destillation ist unproblematisch, da PCB in Form einer niedrig-viskosen Flüssigkeit anfällt.The distillation is not a problem since PCB is obtained in the form of a low-viscosity liquid.

Die Aufbereitung sollte an wenigen zentralen Stellen erfolgen, um eine wirtschaftliche Dimensionierung der Extraktions-und Destillationsapparate zu ermöglichen und eine technisch einwandfreie Durchführung des Verfahrens zu gewährleisten.The preparation should take place at a few central points in order to enable the extraction and distillation apparatus to be economically dimensioned and to ensure that the process is carried out in a technically perfect manner.

Die Anzahl der Extraktionsschritte bis zur vollständigen PCB-Entfernung aus der Isolierflüssigkeit kann durch die Nachschaltung einer zusätzlichen Adsorptionsstufe verringert werden.The number of extraction steps until complete PCB removal from the insulating liquid can be reduced by adding an additional adsorption stage.

Die Wahl des entsprechenden Verfahrens bzw. der entsprechenden Verfahrenskombination richtet sich nach dem gewünschten Reinheitsgrad.The choice of the corresponding process or the corresponding process combination depends on the desired degree of purity.

Ein solches Adsorptionsverfahren ist in dem Aufsatz "Probleme mit PCB-gefüllten Transformatoren Seite 10, VDI-Fachtagung Abwasserwirtschaft am.11.5.82 in Frankfurt/Main beschrieben.Such an adsorption process is described in the article "Problems with PCB-filled transformers page 10, VDI conference on wastewater management on 11.5.82 in Frankfurt / Main.

Zur Reinigung der mit PCB angereicherten Isolierflüssigkeiten werden die kontaminierten Transformatoren entleert, mit frischer Isolierflüssigkeit gefüllt und die verunreinigten Isolierflüssigkeiten anschließend extrahiert.To clean the insulating liquids enriched with PCB, the contaminated transformers are emptied, filled with fresh insulating liquid and the contaminated insulating liquids are then extracted.

Bei Austausch der Isolierflüssigkeiten vor Ort können die Ausfallzeiten des Transformators so gering wie möglich gehalten werden.When the insulating liquids are replaced on site, the downtimes of the transformer can be kept as low as possible.

Die mit dem Extraktionsmittel behandelte Isolierflüssigkeit kann noch Spuren des entsprechenden Lösungsmittels enthalten. Diese können durch höhere Temperaturen oder im Vakuum ausgedämpft werden, obwohl geringe Restmengen die Funktionsweise des Transformators in keiner Weise negativ beeinflussen.The insulating liquid treated with the extractant can still contain traces of the corresponding solvent. These can be dampened by higher temperatures or in a vacuum, although small residual quantities have no negative impact on the functioning of the transformer.

Ein weiteres Problem ist die Entsorgung von Alttrafos. Eine Verschrottung mit Rückgewinnung der Wertstoffe, zum Beispiel des Kupfers, wird bei mit PCB kontaminierten Trafos heutzutage wegen der damit verbundenen Umweltgefährdung nicht praktiziert. Es ist üblich, nach Entleerung der Trafos diese unter Tage zu deponieren.Another problem is the disposal of old transformers. Scrapping with the recovery of valuable materials, such as copper, is not practiced nowadays in transformers contaminated with PCB due to the associated environmental risk. After emptying the transformers, it is common to deposit them underground.

Eine solche Art der Entsorgung führt zu unerwünschten Altlasten.Such a type of disposal leads to undesirable contaminated sites.

Mit dem erfindungsgemäßen Verfahren können Alttrafos einem Recycling zugeführt werden. Zu diesem Zweck werden an einer zentralen Stelle eine größere Anzahl Alttrafos, zum Beispiel mit Rohrleitungen miteinander verbunden und mit einer Isolierflüssigkeit gefüllt, die im Kreislauf umgepumpt wird. Um die Diffusion des PCB in die Isolierflüssigkeit zu beschleunigen, kann der Trafo elektrisch belastet werden, wodurch eine Erwärmung der Isolierflüssigkeit stattfindet. Durch diese neue Verfahrensweise wird im Gegensatz zu einer direkten Behandlung der Trafos mit Lösungsmitteln eine Brandgefahr bzw. eine Umweltgefährdung weitgehendst ausgeschlossen.With the method according to the invention, old transformers can be recycled. For this purpose, a large number of old transformers are connected to one another at a central point, for example with pipes, and filled with an insulating liquid that is pumped around in the circuit. In order to accelerate the diffusion of the PCB into the insulating liquid, the transformer can be loaded electrically, whereby the insulating liquid heats up. This new procedure, in contrast to one Direct treatment of the transformers with solvents largely precludes a fire or environmental hazard.

Die Erfindung wird anhand des folgenden Beispiels erläutert.The invention is illustrated by the following example.

Beispielexample VersuchsdurchführungTest execution

50 ml der Transformator-Isolierflüssigkeit (Silikonöl mit 6000 ppm PCB) wurde in mehreren Schritten mit jeweils 10 ml Methanol extrahiert.50 ml of the transformer insulating liquid (silicone oil with 6000 ppm PCB) was extracted in several steps with 10 ml methanol.

Figure imgb0001
Das Diagramm der Figur zeigt die Abhängigkeit der PCB-Konzentration im Silikonöl von der Auswahl der Extraktionsschritte.
Figure imgb0001
 The diagram in the figure shows the dependence of the PCB concentration in the silicone oil on the selection of the extraction steps.

Claims (7)

1. Verfahren zur Entfernung von Polychlorbiphenylen (PCB) aus Elektroisolierflüssigkeiten beim Ersatz von PCB-ölen durch andere Isolierflüssigkeiten, insbesondere Silikonöle, dadurch gekennzeichnet, daß die Isolierflüssigkeit mit einem flüssigen Extraktionsmittel für Polychlorbiphenyle in Kontakt gebracht und das Extraktionsmittel anschließend von der Isolierflüssigkeit abgetrennt wird.1. A method for removing polychlorobiphenyls (PCB) from electrical insulating liquids when replacing PCB oils with other insulating liquids, in particular silicone oils, characterized in that the insulating liquid is brought into contact with a liquid extracting agent for polychlorobiphenyls and the extracting agent is then separated from the insulating liquid. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß als Extraktionsmittel ein niederer Alkohol verwendet wird.2. The method according to claim 1, characterized in that a lower alcohol is used as the extractant. 3. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß ein Teil der PCB durch das Extraktionsverfahren und der restliche Teil durch ein Adsorptionsverfahren aus der Isolierflüssigkeit entfernt wird.3. The method according to claim 1, characterized in that a part of the PCB is removed by the extraction process and the remaining part by an adsorption process from the insulating liquid. 4. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das mit Polychlorbiphenylen angereicherte Extraktionsmittel durch Destillation von Polychlorbiphenylen getrennt und das von Polychlorbiphenylen befreite Extraktionsmittel erneut zur Extraktion von mit Polychlorbiphenylen verunreinigter Isolierflüssigkeit eingesetzt wird.4. The method according to claim 1, characterized in that the extracting agent enriched with polychlorobiphenylene is separated by distillation of polychlorobiphenylene and the extracting agent freed from polychlorobiphenylene is used again for the extraction of insulating liquid contaminated with polychlorobiphenylene. 5. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die von Polychlorbiphenylen befreite Isolierflüssigkeit erneut eingesetzt wird.5. The method according to claim 1, characterized in that the insulating liquid freed from polychlorobiphenylene is used again. 6. Verfahren nach Anspruch 5, dadurch gekennzeichnet, daß die von Polychlorbiphenylen befreite Isolierflüssigkeit von Extraktionsmittelresten durch Erhitzen auf höhere Temperatur befreit wird.6. The method according to claim 5, characterized in that the insulating liquid freed from polychlorobiphenylene is freed from extractant residues by heating to a higher temperature. 7. Verfahren nach Anspruch 5, dadurch gekennzeichnet, daß die von Polychlorbiphenylen befreite Isolierflüssigkeit durch Vakuumbehandlung von Extraktionsmittelresten befreit wird.7. The method according to claim 5, characterized in that the insulating liquid freed from polychlorobiphenylene is freed from the extractant residues by vacuum treatment.
EP85106477A 1984-07-28 1985-05-25 Process for removing polychlorinated biphenyl (PCB) from electrically insulating fluids Withdrawn EP0170808A1 (en)

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DE19843427878 DE3427878A1 (en) 1984-07-28 1984-07-28 METHOD FOR REMOVING POLYCHLORBIPHENYLENE (PCB) FROM ELECTRO-INSULATING LIQUIDS
DE3427878 1984-07-28

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DE3715235A1 (en) * 1987-05-07 1988-11-24 Micafil Ag Process and device for extracting oil or polychlorinated biphenyl from impregnated electrical components by means of a solvent, and for distillation of the solvent
US4879004A (en) * 1987-05-07 1989-11-07 Micafil Ag Process for the extraction of oil or polychlorinated biphenyl from electrical parts through the use of solvents and for distillation of the solvents
DE4019598A1 (en) * 1990-06-20 1992-01-02 Abb Patent Gmbh METHOD AND DEVICE FOR CLEANING CONTAMINATED SUBSTANCES AND DEVICES
DE4439122A1 (en) * 1994-02-25 1995-08-31 Kokan Keisoku K K Rendering an object contg. PCB(s) safe
DE19514309A1 (en) * 1994-07-20 1996-01-25 Kokan Keisoku K K Process for rendering chlorine-containing substances harmless in industrial waste

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EP0109366A1 (en) * 1982-11-11 1984-05-23 D.E.L.C.O. di COPPO Ing.Mario Method of decontaminating mineral oils and dielectric silicone fluids

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US4340471A (en) * 1980-07-23 1982-07-20 Sun-Ohio Inc. System and apparatus for the continuous destruction and removal of polychlorinated biphenyls from fluids
US4377471A (en) * 1980-12-03 1983-03-22 General Electric Company Method for removing polychlorinated biphenyls from transformer oil

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US4387018A (en) * 1982-03-17 1983-06-07 The United States Of America As Represented By The United States Department Of Energy Method of removing polychlorinated biphenyl from oil
US4405448A (en) * 1982-03-31 1983-09-20 Googin John M Process for removing halogenated aliphatic and aromatic compounds from petroleum products
US4430208A (en) * 1982-10-29 1984-02-07 The Franklin Institute Method for the solvent extraction of polychlorinated biphenyls
EP0109366A1 (en) * 1982-11-11 1984-05-23 D.E.L.C.O. di COPPO Ing.Mario Method of decontaminating mineral oils and dielectric silicone fluids

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PROC. UCC-ND/GAT ENVIRON. PROT. SEMIN., 1982, (CONF.-820418), Seiten 301-306, NTIS, Springfield, Va, US; M.A. MAKAREWICZ: "Solvent extraction of polychlorinated biphenyl" *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3715235A1 (en) * 1987-05-07 1988-11-24 Micafil Ag Process and device for extracting oil or polychlorinated biphenyl from impregnated electrical components by means of a solvent, and for distillation of the solvent
US4879004A (en) * 1987-05-07 1989-11-07 Micafil Ag Process for the extraction of oil or polychlorinated biphenyl from electrical parts through the use of solvents and for distillation of the solvents
US5082535A (en) * 1987-05-07 1992-01-21 Micafil, Ag Apparatus for the extraction of oil or polychlorinated biphenyl from electrical parts through the use of solvents and for distillation of the solvents
DE4019598A1 (en) * 1990-06-20 1992-01-02 Abb Patent Gmbh METHOD AND DEVICE FOR CLEANING CONTAMINATED SUBSTANCES AND DEVICES
DE4439122A1 (en) * 1994-02-25 1995-08-31 Kokan Keisoku K K Rendering an object contg. PCB(s) safe
DE19514309A1 (en) * 1994-07-20 1996-01-25 Kokan Keisoku K K Process for rendering chlorine-containing substances harmless in industrial waste

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DE3427878A1 (en) 1986-03-06
ZA854599B (en) 1986-02-26
ES545573A0 (en) 1986-02-01
ES8605855A1 (en) 1986-02-01

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