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US 5,288,934 AGranted
Process for the conversion of polymers
AssigneePetrofina, S.A.
InventorAxel de Broqueville
Life of this patent
Estimating the term…
Abstract
Milled polymers are contacted with a liquid which dissolves selectively polystyrene and which separates by specific gravity polyolefins from PET and PVC. Then, at least one of the sorted polymers is converted into lower molecular weight products.
Claims28
A process for the conversion of polymers into recyclable material comprising:
- (1) contacting crushed polymers with a liquid which dissolves styrenic polymers, which does not dissolve polyolefins, polyethylene terephthalate (PET) and polyvinyl chloride (PVC) and which can separate by specific gravity polyolefins from PET and PVC;
- (2) separating into:
- (a) one fraction comprising a polymeric material comprising the dissolved styrenic polymers
- (b) one fraction comprising a polymeric material comprising the polyolefins, and
- (c) one fraction comprising a polymeric material comprising a mixture comprising PET and PVC;
- (3) cracking at least one polymeric material separated at the preceding step into lower molecular weight products.
3 more elements
Dependencies are inferred from the claim text.