EP0221028A1 - A process for the decontamination of apparatus or other materials contaminated by PCB or other toxic and noxious substances - Google Patents

A process for the decontamination of apparatus or other materials contaminated by PCB or other toxic and noxious substances Download PDF

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Publication number
EP0221028A1
EP0221028A1 EP86830132A EP86830132A EP0221028A1 EP 0221028 A1 EP0221028 A1 EP 0221028A1 EP 86830132 A EP86830132 A EP 86830132A EP 86830132 A EP86830132 A EP 86830132A EP 0221028 A1 EP0221028 A1 EP 0221028A1
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EP
European Patent Office
Prior art keywords
solvent
autoclave
pcb
decontamination
toxic
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Granted
Application number
EP86830132A
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German (de)
French (fr)
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EP0221028B1 (en
Inventor
Mario Coppo
Piera Tacchina
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ECOLSIR Srl
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ECOLSIR Srl
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Priority to AT86830132T priority Critical patent/ATE65925T1/en
Publication of EP0221028A1 publication Critical patent/EP0221028A1/en
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Publication of EP0221028B1 publication Critical patent/EP0221028B1/en
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    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
    • B08B3/04—Cleaning involving contact with liquid
    • B08B3/08—Cleaning involving contact with liquid the liquid having chemical or dissolving effect
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/08—Cooling; Ventilating
    • H01F27/10—Liquid cooling
    • H01F27/12—Oil cooling
    • H01F27/14—Expansion chambers; Oil conservators; Gas cushions; Arrangements for purifying, drying, or filling

Definitions

  • This invention relates to a process for decontaminating apparatus, particularly electrical apparatus, contaminated by toxic and noxious substances.
  • noxious contaminants are arsenic compounds, chlorinated compounds, etc., but especially polychlorobiphenyls and dioxin.
  • polychlorobiphenyl As is known, polychlorobiphenyl (PCB) has physical and chemical properties which make it very suitable for a large range of applications.
  • aromatic chlorinated compounds possess very good chemical and dielectric properties and heat stability.
  • polychlorobiphenyls are very stable, in general chemically inert, compounds and they do not react under normal conditions, so that only when in presence of reagents and under extreme reactive conditions they give rise to the formation of new compounds.
  • PCB was used as an electro-insulating fluid for transformers and condensers, as an industrial fluid for use in coolants for machine operations, in hydraulic systems and vacuum pumps. It is also utilizable as a: flame retardant, heat transfer agent and plasticizer.
  • PCB are a class of compounds which, even though present in small amounts, are very toxic towards living cells and they produce systematic toxic effects. Comparatively recent research work has shown PCB as being a possible carcinogen and inducing neoplastic changes in mice.
  • PCB accumulates in aliments owing to its solubility in fatty tissues and its resistance to chemical degradation.
  • problems with BCB are that PCB is soluble in fats, is stored in animal lipids and tends to be concentrated in foods in high quantities.
  • resistance of PCB to thermal, chemical and biological degradation has contributed to its accumulation, particularly in industrial environments.
  • the very low biodegradation rates and the high resistance to metabolic changes of PCB are causes for ecological and pollution problems, so that measures have to be taken for elimination thereof.
  • the system only used for eliminating PCB is incineration but incinerators are very expensive and cause further problems to arise. PCB is usually destroyed by incineration at high temperatures, say in excess of 1100°C with long residence times in the incinerators being required.
  • an object of this invention is to obviate also this latter disadvantage by providing a process for the decontamination of apparatus contaminated with toxic and noxious substances which requires a very reduced time over that involved in said other processes, while retaining efficiency of these latter.
  • Another object of this invention is to provide a process for the decontamination of apparatus which enables recovery of the solvent to be achieved in an automatic cycle without requiring any integrating distillation.
  • the process according to this invention for the decontamination of apparatus being contaminated by toxic and noxious substances is characterized in that it comprises
  • the liquid solvent is introduced into the autoclave at room temperature.
  • the solvent vapors admitted to the autoclave subsequent to the step of discharging the liquid solvent and simultaneously producing a vacuum are at a temperature of minus 100°C, more preferably of 40° to 80°C.
  • This method permits an apparatus to be decontaminated in a matter of a few hours, the apparatus being decontaminated to a residual contaminant content of less than 50 ppm.
  • a plant that comprises an autoclave A having a condenser C at its upper part, the condenser C forming a top wall for said autoclave.
  • a check valve V6 permitting the air in the autoclave to pass out thereof.
  • An apparatus to be decontaminated such for example as an electric transformer generally designated at T, is introduced into the autoclave by the aid of a basket D.
  • An orifice E is provided in the bottom of the autoclave and communicates the autoclave with an outlet pipe U branching into three pipe legs R1, R2, R8.
  • the pipe leg R1 is connected via a valve V1 and a circulating pump P1 to a pure liquid solvent tank SL
  • the pipe leg R2 is connected via a valve V2 and a circulating pump P2 to a tank SR for collecting the solvent having the contaminant dissolved therein
  • the pipe leg R8 leads to discharge via a valve V8.
  • the collecting tank SR is connected through a pipe 43 and associated pump P3, to a distillation column Z which is designed for the distillation of the contaminant-containing solvent and from which pure solvent fractions in the form of vapors are supplied through a pipe R4, a pump P4 and a three-way valve V4, to either the condenser CO via a pipe R5, or the inlet G to autoclave A via a pipe R6.
  • the pure solvent vapors condensed in condenser CO are supplied to the pure solvent tank SL through pipe R7 and pump P7.
  • a valve V5 permits the residues of distillation to be discharged.
  • an ultrasonic generator US which operates to cause a short ultrasonic discharge to pass through the autoclave walls with the purpose of enhancing solubility of contaminant in the solvent and ability of the solvent to penetrate porous materials.
  • the autoclave A is closed to tightness and supply of pure liquid solvent from tank SL to the bottom of autoclave A commences to take place through pipe branch R1 and tube U via circulating pump P1 and valve V1, the valves V2 and V8 being closed.
  • the solvent commences to dissolve said substance.
  • valve V1 is closed and a ultrasonic discharge is effected from ultrasonic generator US whereupon valve V2 is opened so that liquid solvent, with the contaminant dissolved therein, is withdrawn by extracting pump P2 to be conveyed to receiving tank SR.
  • valve V2 is closed and thereafter valve V4 is opened to permit a stream of hot (50" - 80°C) solvent vapors from distiller Z to be admitted to the autoclave via the pipe R6.
  • the solvent vapors flow upwardly and upon reaching the top of autoclave they commence to condense under effect of condenser C to fall down in the form of droplets.
  • a signal is issued from a level indicator ML and causes valve V4 to be opa rated so as to to permit solvent vapors to enter the condenser CO whereupon condensed pure liquid solvent formed in this condenser is supplied back to tank SL through pipe R7 and pump P5.
  • the solvent vapors injected into the autoclave act on the treated apparatus in such a manner as to remove contaminant particles from the most hidden interstices of said apparatus.
  • valve VI is re-opened to admit again fresh liquid solvent to the autoclave via the circulating pump P1.
  • the fresh liquid solvent entering the autoclave causes the solvent vapors still contained therein to condense and this condensate is mixed with the liquid solvent which is rising to fill the autoclave A.
  • the procedure described above is repeated for a two- three cycles until the amount of contaminant on the apparatus or the material is reduced to below 50 ppm.
  • the time for performing this process of decontamination is about 10h, which is far below that required by the prior art decontamination processes.
  • the most suitable solvents for use in the process of this invention are, in general, the chlorinated compounds of paraffin i c or olefinic hydrocarbons dissolving which have a high/power towards the above mentioned contaminants, in particular use being made of perchloroethylene for the olefinic chlorinated hydrocarbons and of 1,1,1-trichloroethane for the paraffinic chlorinated hydrocarbon a.
  • a control station which is designed to govern all of the decontaminating and other related operations in a predetermined automatic sequence such that a very reduced personnel is required for operation of the plant.
  • the apparatus or the material to be decontaminated is always immersed in the solvent.
  • the ultrasonic discharge whereby a pulsating movement is transmitted to the liquid solvent to cause it to penetrate more and more deep the inaccessible recesses or interstices in the apparatus or material to be treated, such that, upon extracting solvent from the autoclave the extracted solvent already contains contaminant to a large amount.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Power Engineering (AREA)
  • Organic Chemistry (AREA)
  • Processing Of Solid Wastes (AREA)
  • Cleaning By Liquid Or Steam (AREA)
  • Saccharide Compounds (AREA)
  • Fire-Extinguishing Compositions (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)

Abstract

A process for the decontamination of apparatus or other materials being contaminated with PCB or other toxic and noxious substances, comprises introducing the contaminated apparatus or material into an autoclave provided with a condenser, charging a liquid solvent to the autoclave to fill it up, applying an ultrasonic charge to the autoclave containing the liquid solvent, removing the dissolved contaminant-containing solvent from the autoclave while producing a vacuum, admitting solvent vapors to the autoclave until they reach the top part of the autoclave where the solvent vapors condense and commence to drop off, stopping the solvent vapor admission and repeating the above steps a few cycles.

Description

  • This invention relates to a process for decontaminating apparatus, particularly electrical apparatus, contaminated by toxic and noxious substances.
  • Included among noxious contaminants are arsenic compounds, chlorinated compounds, etc., but especially polychlorobiphenyls and dioxin.
  • As is known, polychlorobiphenyl (PCB) has physical and chemical properties which make it very suitable for a large range of applications. In general, aromatic chlorinated compounds possess very good chemical and dielectric properties and heat stability. In particular, polychlorobiphenyls are very stable, in general chemically inert, compounds and they do not react under normal conditions, so that only when in presence of reagents and under extreme reactive conditions they give rise to the formation of new compounds.
  • Accordingly, PCB was used as an electro-insulating fluid for transformers and condensers, as an industrial fluid for use in coolants for machine operations, in hydraulic systems and vacuum pumps. It is also utilizable as a: flame retardant, heat transfer agent and plasticizer.
  • Unfortunately, some of the properties of PCB that contribute to its spreading range of applications are also involved in sanitary and ecologic problems recently abscribed to the use of polychlorobiphenyls. PCB are a class of compounds which, even though present in small amounts, are very toxic towards living cells and they produce systematic toxic effects. Comparatively recent research work has shown PCB as being a possible carcinogen and inducing neoplastic changes in mice.
  • PCB accumulates in aliments owing to its solubility in fatty tissues and its resistance to chemical degradation. Basically, the problems with BCB are that PCB is soluble in fats, is stored in animal lipids and tends to be concentrated in foods in high quantities. Moreover, resistance of PCB to thermal, chemical and biological degradation has contributed to its accumulation, particularly in industrial environments. The very low biodegradation rates and the high resistance to metabolic changes of PCB are causes for ecologic and pollution problems, so that measures have to be taken for elimination thereof. The system only used for eliminating PCB is incineration but incinerators are very expensive and cause further problems to arise. PCB is usually destroyed by incineration at high temperatures, say in excess of 1100°C with long residence times in the incinerators being required. The ordinary incinerators, as used for eliminating organic matters, normally tend to vaporize PCB rather than converting it to CO2, water and IICl. Obviously, other toxic and objectionable substances exist khich are very hard to eliminate and materials contaminated thereby require likewise special measures for elimination thereof.
  • Thus, there is a need for other methods of disposal of apparatus, particularly electrical apparatus, when contaminated by PCB and other contaminating substances. For example, most of them are presently buried into pits or caverns.
  • Accordingly, a different decontamination system for such apparatus has to be found which also should permit reutilization thereof without involving any dangers to the persons who have to manipulate them, or to the environment.
  • Most recently proposed processes for the decontamination of apparatus contaminated with PCB and other toxic andnoxious substances have provided for consecutive washings with liquid solvent at atmospheric pressure to dissolve as high an amount of contaminant as possible in the liquid solvent, the contaminant being then eliminated and the solvent recovered. In the following, the term 'contaminant' is intended to include PCB and all other toxic and noxious substances such as dioxin, arsenic compounds, etc..
  • However, the above processes have not proven satisfactory in that, as already said, the involved contaminant is a chemical compound hard to dissolve, and this is especially so when apparatus to be decontaminated have parts to which access by solvent is difficult.
  • Other processes are also known which provide for waahing the apparatus with solvent, the washing being effected in a vapor phase and under vacuum. These processes have proven satisfactory in that they succeed in removing contaminant from an apparatus to bring it down to an amount less than that accepted by ecological defense authorities. However, a disadvantage of these processes is the time they require for the decontamination of an apparatus, which time is in any case, under best operating conditions, of the order of not less than 48h.
  • Accordingly, an object of this invention is to obviate also this latter disadvantage by providing a process for the decontamination of apparatus contaminated with toxic and noxious substances which requires a very reduced time over that involved in said other processes, while retaining efficiency of these latter.
  • Another object of this invention is to provide a process for the decontamination of apparatus which enables recovery of the solvent to be achieved in an automatic cycle without requiring any integrating distillation.
  • More specifically, the process according to this invention for the decontamination of apparatus being contaminated by toxic and noxious substances, is characterized in that it comprises
    • - introducing the apparatus to be decontaminated into an autoclave provided at the top with a condenser and closed to tightness,
    • - charging a liquid solvent into the autoclave until filling it up,
    • - applying a ultrasonic discharge to the autoclave containing the liquid solvent,
    • - withdrawing the dissolved contaminant-containing solvent from the autoclave so producing a vacuum simultaneously,
    • - admitting solvent vapors to the autoclave until they reach the top part of the autoclave where the solvent vapors are condensed and begin to drop off,
    • - stopping the admission of solvent vapors and repeating the above steps for a few cycles.
  • advantageously, the liquid solvent is introduced into the autoclave at room temperature.
  • Preferably, the solvent vapors admitted to the autoclave subsequent to the step of discharging the liquid solvent and simultaneously producing a vacuum, are at a temperature of minus 100°C, more preferably of 40° to 80°C.
  • This method permits an apparatus to be decontaminated in a matter of a few hours, the apparatus being decontaminated to a residual contaminant content of less than 50 ppm.
  • The invention will now be described in full details in connection with a preferred embodiment thereof shown by way of a non restrictive example in the accompanying drawing, wherein the single figure diagrammatically shows a plant for carrying out the process of the invention.
  • Referring now to the drawing, there is illustrated a plant that comprises an autoclave A having a condenser C at its upper part, the condenser C forming a top wall for said autoclave. Provided in this top wall is a check valve V6 permitting the air in the autoclave to pass out thereof. An apparatus to be decontaminated, such for example as an electric transformer generally designated at T, is introduced into the autoclave by the aid of a basket D.
  • An orifice E is provided in the bottom of the autoclave and communicates the autoclave with an outlet pipe U branching into three pipe legs R1, R2, R8.
  • The pipe leg R1 is connected via a valve V1 and a circulating pump P1 to a pure liquid solvent tank SL, the pipe leg R2 is connected via a valve V2 and a circulating pump P2 to a tank SR for collecting the solvent having the contaminant dissolved therein, while the pipe leg R8 leads to discharge via a valve V8.
  • The collecting tank SR is connected through a pipe 43 and associated pump P3, to a distillation column Z which is designed for the distillation of the contaminant-containing solvent and from which pure solvent fractions in the form of vapors are supplied through a pipe R4, a pump P4 and a three-way valve V4, to either the condenser CO via a pipe R5, or the inlet G to autoclave A via a pipe R6. The pure solvent vapors condensed in condenser CO are supplied to the pure solvent tank SL through pipe R7 and pump P7. A valve V5 permits the residues of distillation to be discharged.
  • Mounted on the outside of autoclave A is an ultrasonic generator US which operates to cause a short ultrasonic discharge to pass through the autoclave walls with the purpose of enhancing solubility of contaminant in the solvent and ability of the solvent to penetrate porous materials.
  • Operation of the plant is very simple.
  • Once the transformer T has been introduced in the autoclave A, the autoclave A is closed to tightness and supply of pure liquid solvent from tank SL to the bottom of autoclave A commences to take place through pipe branch R1 and tube U via circulating pump P1 and valve V1, the valves V2 and V8 being closed. Upon the liquid solvent coming into contact with the transformer contaminated by toxic and noxious substances, the solvent commences to dissolve said substance. When the solvent has reached the top wall of autoclave A, valve V1 is closed and a ultrasonic discharge is effected from ultrasonic generator US whereupon valve V2 is opened so that liquid solvent, with the contaminant dissolved therein, is withdrawn by extracting pump P2 to be conveyed to receiving tank SR. Du ring this extraction of solvent from autoclave, a vacuum is produced therein due to the autoclave being thoroughly closed to tightness. Once the liquid solvent has been drained off the autoclave A, valve V2 is closed and thereafter valve V4 is opened to permit a stream of hot (50" - 80°C) solvent vapors from distiller Z to be admitted to the autoclave via the pipe R6. The solvent vapors flow upwardly and upon reaching the top of autoclave they commence to condense under effect of condenser C to fall down in the form of droplets. At this time, a signal is issued from a level indicator ML and causes valve V4 to be opa rated so as to to permit solvent vapors to enter the condenser CO whereupon condensed pure liquid solvent formed in this condenser is supplied back to tank SL through pipe R7 and pump P5. The solvent vapors injected into the autoclave act on the treated apparatus in such a manner as to remove contaminant particles from the most hidden interstices of said apparatus. At this time, valve VI is re-opened to admit again fresh liquid solvent to the autoclave via the circulating pump P1.
  • The fresh liquid solvent entering the autoclave causes the solvent vapors still contained therein to condense and this condensate is mixed with the liquid solvent which is rising to fill the autoclave A.
  • The procedure described above is repeated for a two- three cycles until the amount of contaminant on the apparatus or the material is reduced to below 50 ppm. The time for performing this process of decontamination is about 10h, which is far below that required by the prior art decontamination processes.
  • The most suitable solvents for use in the process of this invention are, in general, the chlorinated compounds of paraffin ic or olefinic hydrocarbons dissolving which have a high/power towards the above mentioned contaminants, in particular use being made of perchloroethylene for the olefinic chlorinated hydrocarbons and of 1,1,1-trichloroethane for the paraffinic chlorinated hydrocarbon a.
  • Recovery of these solvents is quite easy to obtain so that the plant can be expected to be operating on a thoroughly automatic cycle.
  • To this end, a control station can be provided which is designed to govern all of the decontaminating and other related operations in a predetermined automatic sequence such that a very reduced personnel is required for operation of the plant.
  • Furthermore, with the process of the invention the apparatus or the material to be decontaminated is always immersed in the solvent.
  • Of particular importance in this respect is the ultrasonic discharge whereby a pulsating movement is transmitted to the liquid solvent to cause it to penetrate more and more deep the inaccessible recesses or interstices in the apparatus or material to be treated, such that, upon extracting solvent from the autoclave the extracted solvent already contains contaminant to a large amount.
  • It is to be noted that the expression "other materials" in this context is intended to include, in addition to apparatus, also, for example, a PCB- or dioxin-contaminated soil which will be thoroughly reclaimed by this process.
  • From the above, it will be appreciated that the process of the invention offers a number of advantages over the prior art processes, the most significant advantages residing in that :
    • - the time of treatment is substantially reduced due to the alternate use of liquid-phase and vapor-phase solvent- extraction steps,
    • - recovery of the solvent is achieved on an automatic cycle-base without requiring any integrating process of distillation, the removed contaminant being collected immediately,
    • - decontamination of apparatus or materials is achieved to a drastic extent due to the action of the ultrasonic discharge which is used as an integrating and basic teahnique of the inventive process to cause the liquid solvent to penetrate the most inaccessible interstices or recesses of the material to be decontaminated,
    • - a vacuum is produced by merely draining the autoclave. Although a preferred embodiment of the invention has been disclosed herein above, it is to be intended that changes thereto, such as might readily occur to one skilled in the art, are possibile without departing from the spirit and scope of the invention.

Claims (4)

1. A process for the decontamination of apparatus or other materials contaminated by toxic and noxious substances, in particular PCB and dioxin, characterized in that it comprises :-
- introducing the apparatus to be decontaminated into an autoclave which is provided at its top with a condenser and which is tightly closed,
- admitting a liquid solvent to the autoolave to fill it up,
- applying a ultrasonic discharge to the autoclave containing the liquid solvent,
- removing the dissolved contaminant-containing solvent from the autoolave while simultaneously producing a vacuum,..
- admitting solvent vapors to the autoclave until the solvent vapors reach the top part of the autoolave where they are condensed and commenoe to drop off,
- stopping admission of solvent vapors and repeating said steps for a few cycles.
2. The process according to claim 1, wherein the liquid solvent is charged to the autoclave at room temperature.
3. The process according to claim 1, wherein the solvent vapors admitted subsequent to the step of discharging the liquid solvent and simultaneously producing a vacuum, are at a temperature of less than 100°C, preferably at a temperature in the range of 40° to 80°C.
4. The process according to any of the preceding claims, wherein perchloroethylene or 1,1,1-trichloroethane is used as the solvent.
EP86830132A 1985-10-24 1986-05-20 A process for the decontamination of apparatus or other materials contaminated by pcb or other toxic and noxious substances Expired EP0221028B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86830132T ATE65925T1 (en) 1985-10-24 1986-05-20 PROCEDURE FOR DECONTOMINATION OF EQUIPMENT OR OTHER MATERIAL TOXICED BY PCB OR OTHER TOXIC OR POLLUTANT SUBSTANCES.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2260785 1985-10-24
IT22607/85A IT1190411B (en) 1985-10-24 1985-10-24 PROCEDURE FOR THE POLLUTION OF EQUIPMENT OR OTHER MATERIALS CONTAMINATED WITH PCB OR OTHER TOXIC AND HARMFUL SUBSTANCES

Publications (2)

Publication Number Publication Date
EP0221028A1 true EP0221028A1 (en) 1987-05-06
EP0221028B1 EP0221028B1 (en) 1991-08-07

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EP86830132A Expired EP0221028B1 (en) 1985-10-24 1986-05-20 A process for the decontamination of apparatus or other materials contaminated by pcb or other toxic and noxious substances

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EP (1) EP0221028B1 (en)
AT (1) ATE65925T1 (en)
DE (1) DE3680744D1 (en)
IT (1) IT1190411B (en)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0290098A1 (en) * 1987-05-07 1988-11-09 Micafil Ag Process and apparatus for extracting oil or polychlorinated biphenyls from impregnated electrical components by means of a solvating agent, and distillation of the solvent
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
WO1988009225A1 (en) * 1987-05-27 1988-12-01 Pioch Rene Method for decontaminating transformers with pcb
FR2617724A1 (en) * 1987-07-06 1989-01-13 Vigneron Andre Process for the decontamination of electrical apparatuses containing polychlorobiphenyl residues and decontamination device
FR2634674A1 (en) * 1988-08-01 1990-02-02 Sepulcre Patrick Process for recovery of components of electrical equipment containing polychlorobiphenyl residues and treatment devices
EP0424561A1 (en) * 1989-10-25 1991-05-02 Ing. Hubert Maldaner GmbH Apparatus for the impregnation of objects made from porous material
DE4019598A1 (en) * 1990-06-20 1992-01-02 Abb Patent Gmbh METHOD AND DEVICE FOR CLEANING CONTAMINATED SUBSTANCES AND DEVICES
DE4320711A1 (en) * 1993-06-23 1995-01-05 Peter Rusbuelt Process for cleaning transformers
FR2708876A1 (en) * 1993-08-13 1995-02-17 Branson Ultrasons Industrial parts cleaning-rinsing-drying machine.
DE4429391A1 (en) * 1994-08-11 1996-02-15 Boehme Elektr Recycling Gmbh Separation and recovery of harmful materials e.g. poly:chlorinated bi:phenyl(s) from capacitors
EP0747140A2 (en) * 1995-06-06 1996-12-11 Tecno Farm S.R.L. A process and an apparatus for rinsing and/or drying articles that have been subjected to a washing process
ITMI20120073A1 (en) * 2012-01-24 2013-07-25 D E L Co S R L PROCEDURE AND RELATIVE PLANT FOR THE SAFE AND FAST DECONTAMINATION OF POROUS AND NON-CONTAMINATED PCB MATERIALS

Citations (5)

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Publication number Priority date Publication date Assignee Title
US3435835A (en) * 1967-05-10 1969-04-01 American Home Prod Cap washing machine
US4425949A (en) * 1981-02-03 1984-01-17 Diamond Shamrock Corporation Process for removing undesirable substances from electrical devices
EP0098811A1 (en) * 1982-07-02 1984-01-18 S.R.L. Sirea Method of decontaminating electro-mechanic apparatus from polychlorobiphenyl
US4483717A (en) * 1981-10-08 1984-11-20 Olmsted John H Method of removing adsorbent contaminants from electrical apparatus
DE3339048A1 (en) * 1983-10-27 1985-05-09 Nea Nuclear Engineering Fuer A Process for decontaminating solid bodies, and device and ultrasonic source for carrying out the process

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3435835A (en) * 1967-05-10 1969-04-01 American Home Prod Cap washing machine
US4425949A (en) * 1981-02-03 1984-01-17 Diamond Shamrock Corporation Process for removing undesirable substances from electrical devices
US4483717A (en) * 1981-10-08 1984-11-20 Olmsted John H Method of removing adsorbent contaminants from electrical apparatus
EP0098811A1 (en) * 1982-07-02 1984-01-18 S.R.L. Sirea Method of decontaminating electro-mechanic apparatus from polychlorobiphenyl
DE3339048A1 (en) * 1983-10-27 1985-05-09 Nea Nuclear Engineering Fuer A Process for decontaminating solid bodies, and device and ultrasonic source for carrying out the process

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
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
EP0290098A1 (en) * 1987-05-07 1988-11-09 Micafil Ag Process and apparatus for extracting oil or polychlorinated biphenyls from impregnated electrical components by means of a solvating agent, and distillation of the solvent
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
WO1988009225A1 (en) * 1987-05-27 1988-12-01 Pioch Rene Method for decontaminating transformers with pcb
FR2617724A1 (en) * 1987-07-06 1989-01-13 Vigneron Andre Process for the decontamination of electrical apparatuses containing polychlorobiphenyl residues and decontamination device
FR2634674A1 (en) * 1988-08-01 1990-02-02 Sepulcre Patrick Process for recovery of components of electrical equipment containing polychlorobiphenyl residues and treatment devices
EP0424561A1 (en) * 1989-10-25 1991-05-02 Ing. Hubert Maldaner GmbH Apparatus for the impregnation of objects made from porous material
DE4019598A1 (en) * 1990-06-20 1992-01-02 Abb Patent Gmbh METHOD AND DEVICE FOR CLEANING CONTAMINATED SUBSTANCES AND DEVICES
DE4320711A1 (en) * 1993-06-23 1995-01-05 Peter Rusbuelt Process for cleaning transformers
FR2708876A1 (en) * 1993-08-13 1995-02-17 Branson Ultrasons Industrial parts cleaning-rinsing-drying machine.
EP0642845A1 (en) * 1993-08-13 1995-03-15 BRANSON ULTRASCHALL Niederlassung der EMERSON TECHNOLOGIES GmbH & CO. An apparatus for cleaning, rinsing and drying workpieces
DE4429391A1 (en) * 1994-08-11 1996-02-15 Boehme Elektr Recycling Gmbh Separation and recovery of harmful materials e.g. poly:chlorinated bi:phenyl(s) from capacitors
EP0747140A2 (en) * 1995-06-06 1996-12-11 Tecno Farm S.R.L. A process and an apparatus for rinsing and/or drying articles that have been subjected to a washing process
EP0747140B1 (en) * 1995-06-06 2001-10-24 C.S.R. Di Brotto Luigia A process and an apparatus for rinsing and/or drying articles that have been subjected to a washing process
ITMI20120073A1 (en) * 2012-01-24 2013-07-25 D E L Co S R L PROCEDURE AND RELATIVE PLANT FOR THE SAFE AND FAST DECONTAMINATION OF POROUS AND NON-CONTAMINATED PCB MATERIALS

Also Published As

Publication number Publication date
IT1190411B (en) 1988-02-16
ATE65925T1 (en) 1991-08-15
IT8522607A0 (en) 1985-10-24
EP0221028B1 (en) 1991-08-07
DE3680744D1 (en) 1991-09-12

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