WO2002002209A2 - Recovery of blowing agent from polymeric foam - Google Patents

Recovery of blowing agent from polymeric foam

Info

Publication number
WO2002002209A2
WO2002002209A2 PCT/US2001/020145 US0120145W WO0202209A2 WO 2002002209 A2 WO2002002209 A2 WO 2002002209A2 US 0120145 W US0120145 W US 0120145W WO 0202209 A2 WO0202209 A2 WO 0202209A2
Authority
WO
WIPO (PCT)
Prior art keywords
blowing agent
air stream
laden
media
foam
Prior art date
Application number
PCT/US2001/020145
Other languages
French (fr)
Other versions
WO2002002209A3 (en
Inventor
Satish V. Bhagwat
Original Assignee
Owens Corning
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 Owens Corning filed Critical Owens Corning
Priority to AU2001270130A priority Critical patent/AU2001270130A1/en
Publication of WO2002002209A2 publication Critical patent/WO2002002209A2/en
Publication of WO2002002209A3 publication Critical patent/WO2002002209A3/en

Links

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
    • B01D53/02—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 by adsorption, e.g. preparative gas chromatography
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
    • B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J11/00—Recovery or working-up of waste materials
    • C08J11/02—Recovery or working-up of waste materials of solvents, plasticisers or unreacted monomers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
    • B09B2101/00—Type of solid waste
    • B09B2101/02—Gases or liquids enclosed in discarded articles, e.g. aerosol cans or cooling systems of refrigerators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
    • B09B2101/00—Type of solid waste
    • B09B2101/75—Plastic waste
    • B09B2101/78—Plastic waste containing foamed plastics, e.g. polystyrol

Definitions

  • This invention relates to a process for the recovery of blowing agents released during the manufacturing process of foam bodies. This invention also relates to a process for the recovery of blowing agents released during the recycling of a foam body.
  • blowing agent such as a hydrochlorofluorocarbon (HCFC)
  • HCFC hydrochlorofluorocarbon
  • foam bodies release the blowing agents when they are comminuted. Comminution may occur during the machining of the foam bodies or during the grinding of the foam bodies for recycling and reuse in the foam manufacturing process.
  • the blowing agent released at a number of process points is carried through the process exhaust streams, which are released to atmosphere as waste process exhaust. It would be desirable to discover a process wherein the valuable blowing agent is efficiently and cost- effectively recovered from the process exhaust of foam manufacturing process and reused.
  • Processes have been proposed to recover blowing agents from foam bodies comprising: a) passing air over foam manufacturing lines and foam recovery units resulting in an effluent mixture of blowing agent and air, b) separating the blowing agent from the effluent mixture by the preferential adsorption of the blowing agent on adsorbent material, and c) stripping the blowing agent from the adsorbent by desorbing the adsorbent material for reusing the adsorbent in the adsorption process.
  • One method of separating blowing agent from the effluent mixture is by passing the effluent mixture over a static bed of an adsorbent material. During a stripping step, the adsorbent material is heated to recover the desired blowing agent.
  • An example of such a process is U.S. Pat. No. 4,531,950 wherein activated carbon is used as the adsorbent material.
  • activated carbon is a non-specific adsorbent and adsorbs not only the desired blowing agent but also other unwanted constituents such as water vapor from the effluent stream. Also, the presence of water vapor in process exhaust reduces activated carbon's adsorption capacity to capture the blowing agent.
  • blowing agents that have been used for foam manufacture are hydrochlorocarbons, hydrochlorofluorocarbons, and hydrofluorocarbons and these blowing agents may react with water vapor in a hydrolysis reaction during the stripping step to product dangerous and undesirable byproducts of hydrolysis reaction such as hydrochloric acid (HC1) or hydrofluoric acid (HF).
  • hydrochloric acid HC1
  • HF hydrofluoric acid
  • the present invention employs a hydrophobic polymer material as the adsorbent media thereby yielding a recovery process which: a) is more blowing agent specific, b) does not adsorb water, c) is a more efficient method of stripping blowing agent from a laden adsorbent, and d) minimizes the production of dangerous and undesirable acids during the stripping step.
  • the present invention is directed towards a method of recovering blowing agent gas released from foam bodies. Accordingly, foam bodies are comminuted in an air stream. The air stream flow rate is optimized to maximize the blowing agent concentration, while still maintaining the effectiveness of conveying the comminuted blowing agent. As the foam bodies are comminuted, trapped blowing agent gas is released into the air stream thereby producing an air stream laden with blowing agent gas. The laden air stream may be passed though a filter in order to remove any foam particulate material. The laden air stream is then passed over a hydrophobic adsorbent media capable of adsorbing the blowing agent.
  • the adsorbent media is then heated causing the blowing agent to be released from the media as a gas.
  • the blowing agent gas may then be collected by suctioning the gas off to a zone where the blowing agent gas is condensed into its liquid form.
  • the blowing agent gas may also be collected by passing a carrier gas over the media to produce a carrier gas laden with blowing agent.
  • the blowing agent may then be collected by cooling the carrier gas such that the blowing agent condenses to its liquid form.
  • the present invention's method of recovering blowing agent is generally applicable to any foam body containing trapped blowing agent in its structure.
  • the foam body may comprise various types of polymers including homopolymers, copolymers and terpolymers of styrene with acrylonitrile or butadiene either as copolymers or as grafted segments, both branched and linear polyethylene, isotactic polypropylene, polybutenes, and copolymers of ethylene with other olefins, copolymers of ethylene and vinylacetate, the homopolymers of vinyl chloride, and copolymers with propylene and vinylidene chloride, and the homopolymers and copolymers of the alkylstyrenes.
  • the invention is especially applicable to foams formed from polymers with substantial aromatic content such as the styrenic polymers, or heteroatoms, such as the vinyl acetate and vinyl chloride polymers, since these polymers tend to retain the blowing agent for considerable periods of time, and offer the best opportunities for blowing agent recovery during regrinding of scrap or crushing of the foam.
  • This invention is applicable to the recovery of any conventional blowing agent used in the production of foam bodies.
  • the invention is applicable to fully and partially halogenated aliphatic hydrocarbons including fluorocarbons, chlorocarbons, hydrochlorofluorocarbons and chlorofluorocarbons and mixtures thereof.
  • fluorocarbons include methyl fluoride, perfluoromethane, ethyl fluoride, 1,1- difluoroethane, 1,1,1-trifluoroethane (HFC-143a), 1,1,1,2-tetrafluoroethane (HFC-134a), pentafluoroethane, difluoromethane, perfluoroethane, 2,2-difluoropropane, 1,1,1- trifluoropropane, perfluoropropane, dichloropropane, difluoropropane, perfluorobutane, perfluorocyclobutane.
  • Partially halogenated chlorocarbons, hydrochlorofluorocarbons and chlorofluorocarbons include methyl chloride, methylene chloride, ethyl chloride, 1,1,1- trichloroethane, 1 , 1 -dichloro- 1 -fluoroethane (HCFC- 141b), 1 -chloro- 1 , 1 -difluoroethane (HCFC-142b), l,l-dichloro-2,2,2-trifluoroethane (HCFC-123) and 1 -chloro- 1,2,2,2- tetrafluoroethane (HCFC-124).
  • Fully halogenated chlorofluorocarbons include trichloromonofluoromethane (CFC-11), dichlorodifluoromethane (CFC-12), trichlorotrifluoroethane (CFC-113), 1,1,1-trifluoroethane, pentafluoroethane, dichlorotetrafluoroethane (CFC-114), chloroheptafluoropropane, and dichlorohexafluoropropane.
  • CFC-11 trichloromonofluoromethane
  • CFC-12 dichlorodifluoromethane
  • CFC-113 trichlorotrifluoroethane
  • 1,1,1-trifluoroethane pentafluoroethane
  • pentafluoroethane pentafluoroethane
  • dichlorotetrafluoroethane CFC-114
  • chloroheptafluoropropane dichlor
  • Extruded foams are generally made by melting a polymer resin and mixing it with a blowing agent under appropriate temperature and pressure so that the blowing agent remains dissolved within the melted polymer resin. This mixture of resin and dissolved blowing agent is then extruded into a zone having a temperature and pressure which causes the dissolved blowing agent to gasify. The melted polymer resin expands and rapidly cools into a solid foam cell structure as the gasifying blowing agent is trapped inside the foam cells
  • blowing agent is released from a foam body when the foam body is comminuted.
  • Comminution of the foam body may occur during the machining of the foam body to produce a final product.
  • Comminution of the foam body may also take place when the foam body is subjected to a grinder for recycling.
  • Recovery of the blowing agent may begin when a foam body is comminuted in an air stream.
  • the air stream may be created by any conventional means known in the art such as by use of vacuum equipment.
  • the vacuum equipment may be positioned so that an air stream is created within which the foam body is comminuted.
  • blowing agent is released as a gas into the air stream thereby creating a laden air stream.
  • the laden air stream is preferably passed over a filter in order to remove fine particulate foam material.
  • the laden air stream is then passed over adsorbent media.
  • the adsorbent media should be hydrophobic to minimized the adsorption of any water vapor from the laden air stream.
  • the adsorbent media should also be capable of adsorbing the blowing agent.
  • the media is preferably in the form of small particles or beads which may fill a chamber and result in a bed defined by the beads having sufficient porosity to enable the laden air stream to flow freely through the media.
  • the adsorbent media is preferably contacted with the laden air stream in a countercurrent flow mode, with the adsorbent media being fluidized (levitated) by the force of the laden air stream, inside a fluidized-bed countercurrent adsorber.
  • the media preferably comprises plastic beads, specifically polymeric beads, which have an affinity for organic compounds whereby such compounds become adsorbed by the polymeric beads as the laden air stream passes through the media.
  • the media comprises a polymeric adsorbent manufactured and sold by The Dow Chemical Company, two forms of which are identified as XU43502 and XUS43493.
  • the heating of the adsorbent media may preferably be done using a microwave heating technique in which batch quantities of adsorbent media is heated inside a microwave chamber.
  • the blowing agent may then be recovered by suction and cooled so that the blowing agent condenses into its liquid form.
  • the blowing agent may also be recovered by passing a carrier gas over the heated media to produce a carrier gas laden with blowing agent.
  • the blowing agent may then be collected as a liquid by cooling the carrier gas and allowing the blowing agent to condense.
  • a carrier gas it should be inert and should be more volatile than the blowing agent.
  • suitable carrier gases include nitrogen, argon, xenon, and mixtures thereof.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Environmental & Geological Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)

Abstract

This invention relates to a process for the recovery of blowing agents from process exhaust streams in the manufacture and recycle of foam bodies. Blowing agents are used in the production of foam bodies. In certain cases, such as when the foam is used for thermal insulation, it is desirable to produce a foam body having trapped blowing agent within the foam body's cell structure. When comminuted, these foam bodies release blowing agent. Comminution of such foam bodies may occur during the machining of the foam bodies or during the grinding of the foam bodies for recycling.

Description

RECOVERY OF BLOWING AGENT FROM FOAM BODIES
FIELD OF THE INVENTION
This invention relates to a process for the recovery of blowing agents released during the manufacturing process of foam bodies. This invention also relates to a process for the recovery of blowing agents released during the recycling of a foam body.
BACKGROUND OF THE INVENTION
Manufacture of certain foam bodies, such as extruded polystyrene (XPS) uses blowing agent, such a hydrochlorofluorocarbon (HCFC), which becomes trapped in the final foam product. The trapped blowing agent imparts desirable thermal insulation properties to the foam body.
These foam bodies release the blowing agents when they are comminuted. Comminution may occur during the machining of the foam bodies or during the grinding of the foam bodies for recycling and reuse in the foam manufacturing process. The blowing agent released at a number of process points is carried through the process exhaust streams, which are released to atmosphere as waste process exhaust. It would be desirable to discover a process wherein the valuable blowing agent is efficiently and cost- effectively recovered from the process exhaust of foam manufacturing process and reused.
Processes have been proposed to recover blowing agents from foam bodies comprising: a) passing air over foam manufacturing lines and foam recovery units resulting in an effluent mixture of blowing agent and air, b) separating the blowing agent from the effluent mixture by the preferential adsorption of the blowing agent on adsorbent material, and c) stripping the blowing agent from the adsorbent by desorbing the adsorbent material for reusing the adsorbent in the adsorption process.
One method of separating blowing agent from the effluent mixture is by passing the effluent mixture over a static bed of an adsorbent material. During a stripping step, the adsorbent material is heated to recover the desired blowing agent. An example of such a process is U.S. Pat. No. 4,531,950 wherein activated carbon is used as the adsorbent material. However, activated carbon is a non-specific adsorbent and adsorbs not only the desired blowing agent but also other unwanted constituents such as water vapor from the effluent stream. Also, the presence of water vapor in process exhaust reduces activated carbon's adsorption capacity to capture the blowing agent. Thus both water vapor and blowing agent are released when the activated carbon is heated during the stripping step. Examples of blowing agents that have been used for foam manufacture are hydrochlorocarbons, hydrochlorofluorocarbons, and hydrofluorocarbons and these blowing agents may react with water vapor in a hydrolysis reaction during the stripping step to product dangerous and undesirable byproducts of hydrolysis reaction such as hydrochloric acid (HC1) or hydrofluoric acid (HF).
The present invention employs a hydrophobic polymer material as the adsorbent media thereby yielding a recovery process which: a) is more blowing agent specific, b) does not adsorb water, c) is a more efficient method of stripping blowing agent from a laden adsorbent, and d) minimizes the production of dangerous and undesirable acids during the stripping step.
SUMMARY OF THE INVENTION The present invention is directed towards a method of recovering blowing agent gas released from foam bodies. Accordingly, foam bodies are comminuted in an air stream. The air stream flow rate is optimized to maximize the blowing agent concentration, while still maintaining the effectiveness of conveying the comminuted blowing agent. As the foam bodies are comminuted, trapped blowing agent gas is released into the air stream thereby producing an air stream laden with blowing agent gas. The laden air stream may be passed though a filter in order to remove any foam particulate material. The laden air stream is then passed over a hydrophobic adsorbent media capable of adsorbing the blowing agent. Once the adsorbent media is saturated with blowing agent, the adsorbent media is then heated causing the blowing agent to be released from the media as a gas. The blowing agent gas may then be collected by suctioning the gas off to a zone where the blowing agent gas is condensed into its liquid form. The blowing agent gas may also be collected by passing a carrier gas over the media to produce a carrier gas laden with blowing agent. The blowing agent may then be collected by cooling the carrier gas such that the blowing agent condenses to its liquid form. DETAILED DESCRIPTION OF THE INVENTION
The present invention's method of recovering blowing agent is generally applicable to any foam body containing trapped blowing agent in its structure. The foam body may comprise various types of polymers including homopolymers, copolymers and terpolymers of styrene with acrylonitrile or butadiene either as copolymers or as grafted segments, both branched and linear polyethylene, isotactic polypropylene, polybutenes, and copolymers of ethylene with other olefins, copolymers of ethylene and vinylacetate, the homopolymers of vinyl chloride, and copolymers with propylene and vinylidene chloride, and the homopolymers and copolymers of the alkylstyrenes. The invention is especially applicable to foams formed from polymers with substantial aromatic content such as the styrenic polymers, or heteroatoms, such as the vinyl acetate and vinyl chloride polymers, since these polymers tend to retain the blowing agent for considerable periods of time, and offer the best opportunities for blowing agent recovery during regrinding of scrap or crushing of the foam. This invention is applicable to the recovery of any conventional blowing agent used in the production of foam bodies. For example the invention is applicable to fully and partially halogenated aliphatic hydrocarbons including fluorocarbons, chlorocarbons, hydrochlorofluorocarbons and chlorofluorocarbons and mixtures thereof. Examples of fluorocarbons include methyl fluoride, perfluoromethane, ethyl fluoride, 1,1- difluoroethane, 1,1,1-trifluoroethane (HFC-143a), 1,1,1,2-tetrafluoroethane (HFC-134a), pentafluoroethane, difluoromethane, perfluoroethane, 2,2-difluoropropane, 1,1,1- trifluoropropane, perfluoropropane, dichloropropane, difluoropropane, perfluorobutane, perfluorocyclobutane. Partially halogenated chlorocarbons, hydrochlorofluorocarbons and chlorofluorocarbons include methyl chloride, methylene chloride, ethyl chloride, 1,1,1- trichloroethane, 1 , 1 -dichloro- 1 -fluoroethane (HCFC- 141b), 1 -chloro- 1 , 1 -difluoroethane (HCFC-142b), l,l-dichloro-2,2,2-trifluoroethane (HCFC-123) and 1 -chloro- 1,2,2,2- tetrafluoroethane (HCFC-124). Fully halogenated chlorofluorocarbons include trichloromonofluoromethane (CFC-11), dichlorodifluoromethane (CFC-12), trichlorotrifluoroethane (CFC-113), 1,1,1-trifluoroethane, pentafluoroethane, dichlorotetrafluoroethane (CFC-114), chloroheptafluoropropane, and dichlorohexafluoropropane.
The method of the present invention is particularly useful for recovering blowing agent from manufacturing process exhausts of extruded foams. Extruded foams are generally made by melting a polymer resin and mixing it with a blowing agent under appropriate temperature and pressure so that the blowing agent remains dissolved within the melted polymer resin. This mixture of resin and dissolved blowing agent is then extruded into a zone having a temperature and pressure which causes the dissolved blowing agent to gasify. The melted polymer resin expands and rapidly cools into a solid foam cell structure as the gasifying blowing agent is trapped inside the foam cells
According to the invention, blowing agent is released from a foam body when the foam body is comminuted. Comminution of the foam body may occur during the machining of the foam body to produce a final product. Comminution of the foam body may also take place when the foam body is subjected to a grinder for recycling. Recovery of the blowing agent may begin when a foam body is comminuted in an air stream. The air stream may be created by any conventional means known in the art such as by use of vacuum equipment. The vacuum equipment may be positioned so that an air stream is created within which the foam body is comminuted. During the comminution of a foam body, blowing agent is released as a gas into the air stream thereby creating a laden air stream.
The laden air stream is preferably passed over a filter in order to remove fine particulate foam material.
The laden air stream is then passed over adsorbent media. The adsorbent media should be hydrophobic to minimized the adsorption of any water vapor from the laden air stream. The adsorbent media should also be capable of adsorbing the blowing agent. The media is preferably in the form of small particles or beads which may fill a chamber and result in a bed defined by the beads having sufficient porosity to enable the laden air stream to flow freely through the media. The adsorbent media is preferably contacted with the laden air stream in a countercurrent flow mode, with the adsorbent media being fluidized (levitated) by the force of the laden air stream, inside a fluidized-bed countercurrent adsorber.
The media preferably comprises plastic beads, specifically polymeric beads, which have an affinity for organic compounds whereby such compounds become adsorbed by the polymeric beads as the laden air stream passes through the media. In one embodiment, the media comprises a polymeric adsorbent manufactured and sold by The Dow Chemical Company, two forms of which are identified as XU43502 and XUS43493. When the media becomes saturated with blowing agent, the media is heated to release the blowing agent in gas form from the media. The heating of the adsorbent media may preferably be done using a microwave heating technique in which batch quantities of adsorbent media is heated inside a microwave chamber. The blowing agent may then be recovered by suction and cooled so that the blowing agent condenses into its liquid form. The blowing agent may also be recovered by passing a carrier gas over the heated media to produce a carrier gas laden with blowing agent. The blowing agent may then be collected as a liquid by cooling the carrier gas and allowing the blowing agent to condense. If a carrier gas is used, it should be inert and should be more volatile than the blowing agent. Examples of suitable carrier gases include nitrogen, argon, xenon, and mixtures thereof.
While preferred embodiments have been shown and described, it should be understood that a number of changes and modifications are possible therein. Accordingly, it is to be understood that there is no intention to limit the invention to the precise construction disclosed herein, and the right is reserved to all changes and modifications coming within the scope of the invention as defined in the appended claims.

Claims

WHAT IS CLAIMED IS:
1. A process for extraction and recovery of blowing agent contained in polymeric foam comprising the steps of: a) comminuting said polymeric foam in an air stream thereby releasing the blowing agent into said air stream resulting in a laden air stream; b) directing the laden air stream over a plurality of hydrophobic absorbent media capable of absorbing the blowing agent from the laden air stream thereby resulting in a laden absorbent media; c) heating the laden absorbent media while directing a carrier gas over the laden absorbent media thereby releasing the blowing agent; and d) recovering the blowing agent by: i) suctioning the released blowing agent and cooling the blowing agent so that it condenses into liquid form; or ii) directing a carrier stream over the released blowing agent thereby creating a laden carrier stream and cooling the laden carrier stream so that the blowing agent condenses into liquid form.
2. The process of claim 1 wherein the laden absorbent media is heated with microwaves.
3. The process of claim 1 wherein the laden air stream is directed over a plurality of hydrophobic absorbent media so that the media is contacted with the laden air stream in a countercurrent flow, with the adsorbent media being fluidized by the force of the laden air stream.
4. The process of claim 3 wherein the adsorbent media is contacted with the laden air stream inside a fluidized-bed countercurrent adsorber.
5. The process of claim 1 wherein the carrier gas is chosen from a group consisting of nitrogen, argon, xenon, and mixtures thereof.
6. The process of claim 1 wherein the laden air stream is passed though a filter to remove any foam particulate material before directing the laden air stream over the media.
PCT/US2001/020145 2000-06-30 2001-06-22 Recovery of blowing agent from polymeric foam WO2002002209A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2001270130A AU2001270130A1 (en) 2000-06-30 2001-06-22 Recovery of blowing agent from foam bodies

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US60927000A 2000-06-30 2000-06-30
US09/609,270 2000-06-30

Publications (2)

Publication Number Publication Date
WO2002002209A2 true WO2002002209A2 (en) 2002-01-10
WO2002002209A3 WO2002002209A3 (en) 2002-04-18

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AU (1) AU2001270130A1 (en)
WO (1) WO2002002209A2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1747823A1 (en) * 2005-07-25 2007-01-31 MERLONI PROGETTI S.p.A. Condensing method and equipment for recycling systems
WO2021043991A1 (en) * 2019-09-06 2021-03-11 Arkema France Method for recovering and separating unsaturated fluorinated hydrocarbons

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4531950A (en) * 1983-12-19 1985-07-30 Cellu Products Company Method and apparatus for recovering blowing agent from scrap foam
DE3810428A1 (en) * 1988-03-26 1989-10-12 Basf Ag Process for the recovery of volatile halohydrocarbons from closed-cell polyisocyanate polyaddition products
EP0538677A1 (en) * 1991-10-12 1993-04-28 BRESCH ENTSORGUNG GmbH Process for recovery of blowing agents from polymeric foams
US5231980A (en) * 1987-03-04 1993-08-03 Praxair Canada, Inc. Process for the recovery of halogenated hydrocarbons in a gas stream
WO1996030109A1 (en) * 1995-03-24 1996-10-03 Colcard Pty. Limited Refrigerant separation
WO2001027057A1 (en) * 1999-10-08 2001-04-19 Alliedsignal Inc. Separation of halogenated compounds

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4531950A (en) * 1983-12-19 1985-07-30 Cellu Products Company Method and apparatus for recovering blowing agent from scrap foam
US5231980A (en) * 1987-03-04 1993-08-03 Praxair Canada, Inc. Process for the recovery of halogenated hydrocarbons in a gas stream
DE3810428A1 (en) * 1988-03-26 1989-10-12 Basf Ag Process for the recovery of volatile halohydrocarbons from closed-cell polyisocyanate polyaddition products
EP0538677A1 (en) * 1991-10-12 1993-04-28 BRESCH ENTSORGUNG GmbH Process for recovery of blowing agents from polymeric foams
WO1996030109A1 (en) * 1995-03-24 1996-10-03 Colcard Pty. Limited Refrigerant separation
WO2001027057A1 (en) * 1999-10-08 2001-04-19 Alliedsignal Inc. Separation of halogenated compounds

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Title
"Römpp Chemie Lexikon. 9. Auflage. Band 1" 1989 , GEORG THIEME VERLAG , STUTTGART XP002186987 page 83, left-hand column *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1747823A1 (en) * 2005-07-25 2007-01-31 MERLONI PROGETTI S.p.A. Condensing method and equipment for recycling systems
WO2021043991A1 (en) * 2019-09-06 2021-03-11 Arkema France Method for recovering and separating unsaturated fluorinated hydrocarbons
FR3100543A1 (en) * 2019-09-06 2021-03-12 Arkema France Process for the recovery and separation of unsaturated fluorinated hydrocarbons

Also Published As

Publication number Publication date
AU2001270130A1 (en) 2002-01-14
WO2002002209A3 (en) 2002-04-18

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