Process for recycling at least one target polymer from plastic waste containing at least one contaminant
AssigneeFraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
InventorsSwetlana WAGNER, Martin SCHLUMMER, Andreas MÄURER, Mladen JURIC
Life of this patent
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Abstract
The invention relates to a process for recycling at least one target polymer from plastic waste containing at least one contaminant.
Claims26
1-18. (canceled)
A method for recycling at least one target polymer from a plastic waste comprising at least one contaminant, in which
- a) at least one solvent, which has a water solubility of maximally 50%, is added to the plastic waste to selectively dissolve the at least one target polymer,
- b) the at least one dissolved target polymer is precipitated by adding water, or an aqueous salt solution, or water-soluble solvents having a Hansen solubility parameter hydrogen bonding strength value δH of 6 to 12 MPa0.5, as a precipitant, to form a target polymer gel or target polymer particles that have a higher dry matter content compared to the target polymer solution, and
- c) the at least one precipitated target polymer is mechanically separated from the at least one liquid phase consisting of solvent and precipitant in step b).
A polymer recyclate comprising at least one polymer selected from the group consisting of styrene copolymers, polyvinyl chloride, polyvinyl dichloride, polyvinyl acetate, polyvinyl alcohol, polyvinyl butyral, and polycarbonate, wherein a content of contaminant or contaminants is in the range of 0.5 to 1000 ppm.
Dependencies are inferred from the claim text.