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WO2002038660A1 - Procede d'affaissement et de recyclage de la mousse de polystyrene - Google Patents

Procede d'affaissement et de recyclage de la mousse de polystyrene Download PDF

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Publication number
WO2002038660A1
WO2002038660A1 PCT/US2001/032367 US0132367W WO0238660A1 WO 2002038660 A1 WO2002038660 A1 WO 2002038660A1 US 0132367 W US0132367 W US 0132367W WO 0238660 A1 WO0238660 A1 WO 0238660A1
Authority
WO
WIPO (PCT)
Prior art keywords
polystyrene
cosolvent
phase
polyethylene terephthalate
weight
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/US2001/032367
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English (en)
Inventor
Nicholas Edward Kob, Iii
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
EIDP Inc
Original Assignee
EI Du Pont de Nemours and Co
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 EI Du Pont de Nemours and Co filed Critical EI Du Pont de Nemours and Co
Priority to AU2002213307A priority Critical patent/AU2002213307A1/en
Publication of WO2002038660A1 publication Critical patent/WO2002038660A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • C08J11/04—Recovery or working-up of waste materials of polymers
    • C08J11/06—Recovery or working-up of waste materials of polymers without chemical reactions
    • C08J11/08—Recovery or working-up of waste materials of polymers without chemical reactions using selective solvents for polymer components
    • 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
    • C08J2325/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Derivatives of such polymers
    • C08J2325/02—Homopolymers or copolymers of hydrocarbons
    • C08J2325/04—Homopolymers or copolymers of styrene
    • C08J2325/06—Polystyrene
    • 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
    • C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
    • C08J2367/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/62—Plastics recycling; Rubber recycling

Definitions

  • This invention relates to an improved method of recycling polystyrene foam involving collapsing the polystyrene foam in a solvent/cosolvent system without dissolving the polystyrene. More specifically but not by way of limitation, the present invention relates to the use of dialkyl adipate, dialkyl glutarate, dialkyl succinate and mixtures thereof in combination with at least one cosolvent selected from the group consisting of ethylene glycol, propylene glycol, propylene carbonate, dimethyl sulfoxide, diacetone alcohol, and isopropyl alcohol to collapse polystyrene foam and thus physically separate the collapsed softened polystyrene and the liquid solvent system into two different immiscible phases.
  • Such a method is particularly useful in separating and recovering polystyrene from a mixture containing polystyrene and polyethylene terephthalate (PET).
  • Another method of recycling polystyrene described in the known art is to dissolve polystyrene into an organic solvent.
  • dimethyl adipate, dimethyl glutarate, dimethyl succinate and mixtures of these diesters have been used commercially m Japan to dissolve foamed polystyrene.
  • Such technology requires that the dissolved polystyrene be recovered from the organic solvent using one of several techniques. Such techniques include but are not limited to precipitation, extrusion, and flash evaporation.
  • the present invention is an improvement over the current methods in the prior art since the solvent/cosolvent system does not dissolve the polystyrene. Rather the solvent system in the present invention causes the polystyrene lattice to collapse.
  • the lattice collapse results in the desired reduction in polystyrene volume and simple filtration can separate the collapsed polystyrene from the solvent without precipitation, or flash evaporation.
  • the PET sinks In the presence of polyethylene terephthalate, the PET sinks and is subsequently separated and recovered by simple decantation. .
  • the PET sinks with the polyolef ⁇ ns and is subsequently re- dissolved by heating and then separated and recovered by precipitation from solution.
  • the solvent system comprising mainly dimethyl esters of succinate, glutarate, and adipate with a cosolvent that is preferably propylene glycol has the right solvency properties to collapse the polystyrene structure without dissolving it.
  • the present invention provides a safe more cost-effective recycling method for polystyrene using the above-mentioned solvent system.
  • the present invention provides a method for recovering polystyrene and polyethylene terephthalate from a mixture of plastics wherein said mixture of plastics include foamed polystyrene and polyethylene terephthalate comprising the steps of: (a) collapsing foamed polystyrene in a mixture of foamed polystyrene and polyethylene terephthalate without dissolving polystyrene or polyethylene terephthalate thus producing three separate immiscible phases by contacting said polystyrene foam at a temperature from 0 to 50°C with a solvent system comprising for every 100 parts by weight of a dibasic organic acid ester selected from the group consisting of dialkyl adipate, dialkyl glutarate, dialkyl succinate and mixtures thereof, wherein said alkyl groups are either identical or different and have from 1 to 12 carbon atoms, at least one cosolvent selected from the group consisting of;
  • the present invention also provides a method for recycling foamed polystyrene comprising the steps of:
  • a mixture of foamed polystyrene and polyethylene terephthalate are contacted with a solvent system according to the instant invention such as to collapse the foamed polystyrene
  • a solvent system such as to collapse the foamed polystyrene
  • the step of separating a softened collapsed polystyrene phase from a liquid solvent system phase is followed by the further steps of:
  • step (c) heating the liquid solvent system phase with remaining plastics produced in step (b) to a temperature of 160 to 225°C such as to dissolve said polyethylene terephthalate phase;
  • step (c) heating the liquid solvent system phase with remaining plastics produced in step (b) to a temperature of 160 to 225°C such as to dissolve said polyethylene terephthalate phase; (d) separating said liquid solvent system phase with dissolved polyethylene terephthalate from undissolved plastic; and (e) recovering polyethylene terephthalate phase from said liquid solvent system phase.
  • the solvent/cosolvent polymer mixture useful in the above processes comprises from 1 to 40 weight percent polystyrene being collapsed in from 99 to 60 weight percent of a solvent/cosolvent system. Based on the relative densities of the respect phases involved, the softened collapsed polystyrene phase will float on the liquid solvent system phase while the polyethylene terephthalate phase does not float.
  • It is an object of the present invention to provide an improved process for recovering polystyrene using a novel solvent system for collapsing polystyrene foam without dissolving the polystyrene. It is an associated object of the present invention to provide such a solvent system based on a mixture of at least one polystyrene solvent categorically having Hansen solubility parameters within the corresponding polystyrene Hansen solubility envelope and at least one companion cosolvent categorically having Hansen solubility parameters outside the corresponding polystyrene Hansen solubility envelope. Fulfillment of these objects and the presence and fulfillment of other objects will be apparent upon complete reading the attached specification and claims taken in view of the drawing. BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING FIGURE 1 is a two dimensional representation of a Hansen solvent map illustrating selected solvents relative to a polystyrene polymer solubility envelope.
  • FIGURE 2 is a flow diagram illustrating a reclaiming process for polystyrene and PET from a mixed plastic waste stream.
  • the liquid phase solvent system useful in the present invention involves a blend or combination of two different miscible components.
  • the first component consists of the dialkyl esters of dibasic organic acids (DBE's), either used individually or as a mixture.
  • these so-called DBE's are (by themselves) solvents for polystyrene, in that DBE's dissolve polystyrene over a broad range of conditions and concentrations.
  • the organic esters useful in the present invention are formed or produced by reacting dibasic organic acids such as adipic acid, glutaric acid, succinic acid, Ci to C alkyl substituted derivatives of these dibasic acids, mixtures thereof and the like with alcohols or mixtures of alcohols having from 1 to 12 carbons.
  • dimethyl esters of adipic, glutaric, and succinic acid mixtures of these dimetyl esters and esters of 2-ethyl succinic acid and 2- methyl glutaric acid and mixtures of diisobutyl esters of adipic, glutaric, and succinic acids.
  • solvents are commercially available under the product name DBE from E. I. Du Pont de Nemours and Company, Inc. located in Wilmington, Delaware.
  • the second component of the liquid phase solvent system useful in the present invention consists of an organic liquid cosolvent selected from the group consisting of ethylene glycol, propylene glycol, propylene carbonate, dimethyl sulfoxide, diacetone alcohol, and isopropyl alcohol.
  • these second components are referred to as cosolvents in that they are miscible with the DBE first solvent component over a broad range of conditions and concentrations.
  • these second components are categorically non-solvents for polystyrene.
  • liquid phase solvent system is also referred to herein as a "solvent/cosolvent" with the implicit understanding that by definition what is being referred to is a liquid phase that is capable of collapsing foamed polystyrene into a softened polymeric phase (perhaps better viewed as a plastisized polystyrene) but does not dissolve the polystyrene.
  • the liquid phase solvent system comprises a solvent component capable of dissolving polystyrene and a cosolvent component which does not dissolve polystyrene wherein the amount of cosolvent present in the multi component solvent/cosolvent combination is sufficient to prevent polystyrene from dissolving but insufficient to prevent collapse of the foam polystyrene lattice or cellular foam structure.
  • D dispersive or "non-polar" parameter
  • p polar parameter
  • H hydrogen bonding parameter.
  • D dispersive or "non-polar” parameter
  • p polar parameter
  • H hydrogen bonding parameter.
  • D dispersive or "non-polar” parameter
  • p polar parameter
  • H hydrogen bonding parameter.
  • Each of these parameters describes the bonding characteristic of a solvent in terms of polar, non-polar, and hydrogen bonding tendencies. It is customary to plot solvents on a Hansen map where the x-axis is polar bonding and the y-axis is hydrogen bonding.
  • a simple mathematical mixing rule can be applied in order to derive or calculate the respective Hansen parameters for a blend of solvents from knowledge of the respective parameters of each component of the blend and the volume fraction of the component in the blend.
  • Figure 1 is a two dimensional Hansen map as described above with the x-axis representing the polar bonding, P , and the y-axis representing the hydrogen bonding, H - It should be appreciated that this Figure 1 is an approximation in that the third parameter is not being illustrated. Typically this common practice is rationalized on the basis that the non-polar parameter, D , for most commonly employed organic solvents
  • This line represents the demarcation between solvency and insolvency for polystyrene.
  • the solvents that dissolve polystyrene On the inside of the closed area made by the intersection of the x-axis and y-axis and the PS solubility envelope are found the solvents that dissolve polystyrene. On the outside of this area are found the non- solvents that categorically do not dissolve polystyrene.
  • the cosolvents ethylene glycol, propylene carbonate (PC), and dimethyl sulfoxide (DMSO) are outside the polystyrene solubility envelope while DBE is within the polystyrene solubility envelope.
  • a cosolvent (not shown in the drawing) would intersect the polystyrene solubility envelope such as to quantitatively divide this tie line into two line segments the lengths of which would be proportional to the volume fractions of solvent and cosolvent necessary to make a blend that would represent the transition from solvent to non-solvent (as predicted by the
  • the relative amount of cosolvent and DBE solvent employed in the liquid phase solvent system will vary predominantly according to the selection of cosolvent and to a lesser degree according to the selection of DBE or DBE mixture.
  • the lower limit of the amount of cosolvent employed relative to DBE will correspond to the onset of insolubility of polystyrene in the blend.
  • the upper limit of amount of cosolvent employed relative to the amount of solvent/cosolvent blend will correspond to the onset of the lack of the ability of the blend to collapse the foamed polystyrene. In other words, there must be sufficient solvent present to collapse the foam structure but not enough cosolvent to inhibit this process. Typically weight percentages of cosolvent numerically in excess 40 % of the blend will lead to rates of collapse of foamed polystyrene that are impractical.
  • the weight percent of cosolvent necessary to achieve the desired results varies from cosolvent to cosolvent with ethylene glycol requiring from 10 to 40 weight % of the liquid phase system; propylene glycol requiring from 10 to 40 weight %, propylene carbonate requiring from 15 to 30 weight %, dimethyl sulfoxide requiring from 35 to 40 weight %, diacetone alcohol requiring from 35 to 40 weight %, and isopropyl alcohol requiring from 30 to 40 weight %.
  • weight percent ranges correspond to from 10 to 66.7 parts by weight ethylene glycol; from 10 to 66.7 parts by weight propylene glycol; from 17.6 to 42.8 parts by weight propylene carbonate; from 53.8 to 66J parts by weight dimethyl sulfoxide; from 53.8 to 66J parts by weight diacetone alcohol; and from 42.8 to 66.7 parts by weight isopropyl alcohol.
  • the actual forming or making of the liquid solvent phase can be by any of the well-known methods generally practiced in the art for adding one miscible liquid to another. It should be appreciated that the choice of concentration of each cosolvent will be influenced by the above details associated with individual cosolvents. Preferably the amount of the cosolvent employed is in the mid portion of the range unless the ultimate use inherently leads to selective consumption of the solvent or cosolvent thus influencing the preference towards one or other limit of operability. It should also be appreciated that the liquid phase does not have to be free of water and that some water will be present in commercial grades of solvents. For purposes of this invention the presence of some water can in fact be considered an equivalent to a cosolvent and utilized as a supplemental cosolvent.
  • the use of the solvent systems in the process of the present invention is generally viewed as being particularly applicable and advantageously employed to collapse polystyrene foam and subsequently to separate, recover and recycle the collapsed polystyrene.
  • the improved separation and recycle process according to the invention is viewed as being effective in collapsing generally any low density polystyrene foam including in particular both open and closed cellular foams as well the so- called beaded polystyrene foams. Because of the fact that the softened or plastisized polystyrene produced from the collapsed foam floats on the liquid phase, the resulting collapsed polystyrene and solvent mixture is amenable to simple phase separation, isolation and recovery.
  • Such a process is effective at compositional ranges as low as from 1 weight percent foamed polystyrene and 99 weight percent of a solvent/cosolvent system up to 40 weight percent foamed polystyrene and 60 weight percent of a solvent/cosolvent system.
  • the recovered softened polystyrene is also amenable to reprocessing and removal and recovery of residual solvent by such subsequent processes as injection and/ or extrusion molding and the like.
  • the volatilized solvents withdrawn from such subsequent processing can be advantageously recycled to the foamed polystyrene contact step.
  • Figure 2 of the drawing schematically illustrates the basic concept of collapsing foamed polystyrene as well as the subsequent or simultaneous step of separating and recovering the resulting softened polystyrene in the presence of PET using the liquid phase solvent system of the present invention.
  • the foamed polystyrene when in contact with the liquid solvent/cosolvent phase collapses into a buoyant softened state and thus can be readily separated from the top of the liquid solvent system.
  • the collapsing and floating of polystyrene from the mixed plastic waste stream can be further facilitated by an optional grind or chopping step prior to liquid phase contact.
  • any non-foamed polystyrene will tend to be removed along with the collapsed polystyrene.
  • This softened or plastisized polystyrene can then be conveniently directed to an extruder for recovery and recycle of entrained solvent/cosolvent (not shown in Figure 2) simultaneously with fabrication as a manufactured polystyrene product or the like.
  • the liquid solvent system along with the PET, LDPE, HDPE, and PP, after the separation and removal of polystyrene, is then heated to a temperature in the range of 160 to 225°C.
  • the PET remaining in the mixed plastics dissolves at these temperatures into the liquid solvent/cosolvent phase at atmospheric pressure.
  • An advantage of the present invention is that the dimethyl ester solvent system typically has a boiling point above 200°C therefore no pressure (extra energy input) is required on the system to keep the solvent in its liquid state. This also makes the separation scheme less complicated since the separations always involve a liquid stream. Since degradation for some polymers starts to occur at about 250°C the present solvent system is ideal.
  • the actual separation of the PET can be accomplished by hot filtration (or other similar methods of separation well known in the art) to separate the dissolved PET from the undissolved other plastics.
  • This step (not illustrated in Figure 2) is followed by cooling of the dissolved PET solution to 160°C to precipitate out the PET.
  • polystyrene and/or PET can be separated from a mixed plastic stream.
  • Example 1 is presented to more fully demonstrate and further illustrate various individual aspects and features of the present invention and the showings are intended to further illustrate the differences and advantages of the present invention. As such the examples are felt to be non-limiting and are meant to illustrate the invention but are not meant to be unduly limiting.
  • Example 1 is presented to more fully demonstrate and further illustrate various individual aspects and features of the present invention and the showings are intended to further illustrate the differences and advantages of the present invention. As such the examples are felt to be non-limiting and are meant to illustrate the invention but are not meant to be unduly limiting.
  • Example 1 is provided to more fully demonstrate and further illustrate various individual aspects and features of the present invention and the showings are intended to further illustrate the differences and advantages of the present invention. As such the examples are felt to be non-limiting and are meant to illustrate the invention but are not meant to be unduly limiting.
  • a series of individual mixtures involving 20 wt. % foamed polystyrene in contact with 80 wt % liquid phase solvent/cosolvent were prepared and observed at room temperature and pressure by adding the foamed polystyrene to the solvent/cosolvent.
  • the DBE solvent employed was a blend of dimethyl esters of succinate, glutarate, and adipate (i.e., 20 wt. % succinate, 60 wt. % glutarate, and 20 wt. % adipate).
  • the relative amount of the cosolvent to DBE i.e., relative weight percentages in the liquid phase was varied such as to establish the concentration range for operability.
  • Example 2 Comparative example In a manner analogous to Example 1, the behavior of a series of individual mixtures involving 20 wt. % foamed polystyrene in contact with 80 wt % liquid phase single solvents at room temperature and pressure was observed with the following results:
  • Example 3 Foamed polystyrene was added to a mixture of 80 wt% dimetyl esters (which was 20% succinate, 60% glutarate, 20% adipate) and 20 wt% propylene glycol solvent to determine the capacity of the solvent for collapsing foamed polystyrene. It was found that from 1 wt% to 40 wt.% foamed polystyrene could be added to the solvent/cosolvent.
  • Example 5 20 wt.% PET was added to a solution containing dimethyl esters of succinate, glutarate, and adipate and the resulting mixture was heated. At 180°C the PET begins to "soften” and at 200°C the PET dissolved. Upon cooling of the solution to a range of 160 to 170°C the PET re-precipitated out of the DBE solution.
  • Thermal analysis of the precipitated PET by differential scanning calorimetry shows that the thermal properties of the reclaimed PET are equal to that of the virgin. Both PET samples show a characteristic endotherm at 245°C and an exotherm at 453°C.
  • PET was not soluble in the following other solvents tested up to 225°C (solvents systems were under pressure where necessary in order to keep them in the liquid state): Heptane, diethylene glycol butyl ether, ethylene glycol, diisobutyl ketone, toluene, propylene glycol, propylene glycol methyl ether, and diacetone alcohol.
  • Example 7 separation of polystyrene from PET A mixed plastics stream of 4 grams of foamed polystyrene, 4 grams of PET, was added to 100 grams of a solvent consisting of dimethyl esters of succinate, glutarate, and adipate with 20% of cosolvent propylene glycol. The polystyrene collapsed at room temperature and the collapsed polystyrene was separated and recovered by decantation (i. e., in this case floating off of the collapsed polystyrene with some of the solvent). The PET was then dissolved in the remainder of the solvent by heating to 205°C and recovered as a recycle solution. The resulting solution was cooled to 160°C and PET was filtered from recycle solvent.
  • a solvent consisting of dimethyl esters of succinate, glutarate, and adipate with 20% of cosolvent propylene glycol.
  • the PET was then dissolved in the remainder of the solvent by heating to 205°C and recovered as a recycle solution.
  • the resulting solution

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)

Abstract

L'invention concerne un procédé de recyclage amélioré de la mousse de polystyrène, consistant à affaisser la mousse de polystyrène dans un système utilisant des solvants et des cosolvants sans dissoudre le polystyrène, puis à séparer et à récupérer le polystyrène traité flottant de la phase liquide du système de solvants. Le système de solvants utilisé pour affaisser la mousse de polystyrène comprend un solvant d'ester d'acide organique dibasique sélectionné dans le groupe comprenant du dialkyl adipate, du dialkyl glutarate, du dialkyl succinate et des mélanges de ces éléments, ainsi qu'un cosolvant sélectionné dans le groupe comprenant de l'éthylène glycol, du propylène glycol, du carbonate de propylène, du diméthyl sulfoxyde, du diacétone alcool, de l'isopropyl alcool, et des mélanges de ces éléments. Le cosolvant est présent dans le système utilisant des solvants et des cosolvants dans une proportion comprise entre 10 % et 40 % en masse au moins. Ce procédé est particulièrement utile pour isoler et affaisser le polystyrène et le PET, le PET étant plus dense que la phase liquide du système de solvants et soluble dans la phase liquide du solvant à des températures élevées.
PCT/US2001/032367 2000-11-07 2001-10-18 Procede d'affaissement et de recyclage de la mousse de polystyrene Ceased WO2002038660A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2002213307A AU2002213307A1 (en) 2000-11-07 2001-10-18 Method for collapsing and recycling foamed polystyrene

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US70825400A 2000-11-07 2000-11-07
US09/708,254 2000-11-07

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Cited By (4)

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Publication number Priority date Publication date Assignee Title
WO2005082987A1 (fr) * 2004-02-26 2005-09-09 Oda Industry Co., Ltd. Agent antimousse et de retraction pour le polystyrene expanse et procede de demoussage et de retraction du polystyrene expanse
WO2006131376A1 (fr) * 2005-06-08 2006-12-14 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Procede de recyclage de matieres plastiques et application dudit procede
ES2698222A1 (es) * 2017-08-01 2019-02-01 Revestimientos Endurpol S L Procedimiento de obtención de poliestireno endurecido como agregado para la construcción
ES2835344A1 (es) * 2019-12-20 2021-06-22 Univ Alicante Procedimiento para la descontaminacion de plastico reciclado

Families Citing this family (1)

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CN110551320A (zh) * 2019-10-21 2019-12-10 高庆武 用于回收溶解发泡聚苯乙烯的溶剂及回收溶解方法

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005082987A1 (fr) * 2004-02-26 2005-09-09 Oda Industry Co., Ltd. Agent antimousse et de retraction pour le polystyrene expanse et procede de demoussage et de retraction du polystyrene expanse
WO2006131376A1 (fr) * 2005-06-08 2006-12-14 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Procede de recyclage de matieres plastiques et application dudit procede
US8138232B2 (en) 2005-06-08 2012-03-20 Fraunhofer-Gesellschaft Zur Forderung Der Angewandten Forschung E.V. Method for recycling plastic materials and use thereof
ES2698222A1 (es) * 2017-08-01 2019-02-01 Revestimientos Endurpol S L Procedimiento de obtención de poliestireno endurecido como agregado para la construcción
ES2835344A1 (es) * 2019-12-20 2021-06-22 Univ Alicante Procedimiento para la descontaminacion de plastico reciclado
WO2021123475A1 (fr) * 2019-12-20 2021-06-24 Universidad De Alicante Procédé pour la décontamination de plastique recyclé
US20230050476A1 (en) * 2019-12-20 2023-02-16 Universidad De Alicante Method for decontaminating recycled plastic
US12435200B2 (en) 2019-12-20 2025-10-07 Universidad De Alicante Method for decontaminating recycled plastic

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