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US5248041A   Process for the separation of plastics by ...

US5248041A Process for the separation of plastics by ...

Separation of polyethylene from municipal waste plastics by for recycling industry. Wang CQ, Wang H, Liu YN. Waste Manag, 35:42-47, 17 Oct 2014 Cited by 8 articles

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  • Abstract - COnnecting REpositories

    A novel approach, surface micro-alcoholysis treatment SMAT, was proposed for improvement of froth flotation towards the separation of plastics. By means of the SMAT, binary mixtures of polyethylene terephthalate PET and polyvinyl chloride PVC were selective modified to achieve effective separation

  • Separation of normally hydrophobic plastic materials by

     · It is known to use to separate certain types of plastic materials. For example, Valdez et al. U.S. Pat. No. 4,167,477 discloses conditioning a mixture of polystyrene and two different polyamide plastics with sodium silicate and then subjecting the conditioned mixture to to float polystyrene

  • Process for the separation of plastics by flotation

    : The invention relates to a process for separating off polyester plastics from a mixture of polyester, polyvinyl chloride and, if present, other plastics, wherein in the the polyester remains as the residue and the polyvinyl chloride and, if present, other plastics are recovered in floated form, which comprises treating the

  • Separation of PET, PVC and PS by gravity concentration and

    [Show full ] There are six main plastics which arise in municipal solid waste – high density polyethylene, low density polyethylene, polyethylene , polystyrene

  • US5120768A - Process for separating polyethylene

    Today there is a growing demand to recycle plastics including polyethylene . Sources of polyethylene for recycling often contain polyvinyl chloride. It is necessary to separate polyvinyl chloride from the polyethylene before it can be recycled into useful products. This invention reveals a process for recovering polyethylene flakes from a

  • Selective froth flotation of PVC from PVC/PET mixtures for

    Abstract. It was found that strongly alkaline solutions of sodium hydroxide are able to destroy the hydrophobicity of PET whereas the hydrophobicity of polyvinyl chloride PVC remains only slightly affected by these solutions

  • Separation of polycarbonate and acrylonitrile–butadiene

    Separation of polyethylene PET from municipal waste plastics MWP by combined with alkalinemore » The effect of process variables was estimated by L{sub 9} 3{sup 4} orthogonal array of experiments and single factor experiments

  • Purification of polyethylene terephthalate from polyvinyl

     · Strong alkaline solutions of sodium hydroxide are able to destroy the hydrophobicity of allowing for the separation of PVC polyvinyl chloride from PET

  • PDF Separation of PET and PVC by Flotation Technique

    Abstract PET and PVC cannot be separated by gravity separation techniques due to their close density. For this reason, plastic recycling needs other separation techniques. Froth flotation, which is

  • Separation of polyethylene terephthalate from municipal

    intrinsic characteristics, separation of mixed plastics is the key problem for recycling. Separation of polyethylene terephthalate PET from municipal waste plastics MWP by froth flotation combined with alkaline pretreatment was investigated for recycling industry. The effect of process variables was

  • Surface ozonation of polyvinyl chloride for its separation

     · Selective surface modification of polyvinyl chloride PVC by ozonation was evaluated to facilitate the separation of PVC from other heavy plastics with almost the same density as PVC, especially polyethylene PET, by the process. The optimum conditions were investigated, and it was found that at 40°C, 90% of PVC and PET plastics floated

  • Development of a method for separation of PVC and PET

    Abstract Flame treatment can be used to modify the surface of plastics to allow water-based coatings to be attached. The effect of the treatment is to produce hydrophilic species on the surface of

  • CN104194290A - Antistatic PET polyethylene terephthalate

    The invention discloses an antistatic PET polyethylene coil. The antistatic PET coil comprises the following raw materials in percentage by mass: 2-3% of polyacetylene, 0.5-1% of graphite crystal, 0.1-0.3% of dispersing agent and the balance of polyethylene . By an internal mixing method, in the PET moulding state, an antistatic material with improved functions are

  • Green flotation of polyethylene terephthalate and

     · was a promising separation method for efficient recycling of waste plastics. Aiming to avoid the destruction of original surface and secondary pollution, a novel process based on calcium carbonate CaCO 3 coating was proposed for separation of polyvinyl chloride PVC and PET

  • Rigid closed cell polyisocyanate based foams for use as

    1. FIELD OF THE INVENTION. The present invention relates to a method of using a closed cell rigid polyisocyanate based foam, in particular to a method of using 1,1,1,2-tetrafluoroethane/water co-blowing rigid closed cell polyisocyanate based foam as a positive system in watercraft which passes U.S. Coast Guard standard CGD 75-168, Rule §183.144

  • Separation of mixed waste plastics via magnetic levitation

    Six types of plastics, i.e., polypropylene PP, acrylonitrile butadiene styrene ABS, polyamide 6 PA6, polycarbonate PC, polyethylene PET, and polytetrafluoroethylene PTFE, were used to simulate the mixed waste plastics

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