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US 10,472,486 B2Granted
Process for the treatment of a composition comprising thermoplastics
AssigneeSolvay SA
InventorsStéphane Streiff, Dominique Balthasart, Armin T. Liebens, Gérard Antonini
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Abstract
The present invention relates to a process for the treatment of a composition comprising thermoplastics comprising introducing the composition into a reactor under reduction of oxygen content of the atmosphere, heating the composition in the presence of a solvent to liquefy the thermoplastics, separating insoluble fractions and recovering the liquefied thermoplastics which process is conducted with an aliphatic hydrocarbon as solvent.
Claims12
Process for the treatment of a composition comprising thermoplastics, the process comprising the steps of
- a) introducing the composition comprising thermoplastics into a reactor under reduction of oxygen content of the atmosphere, wherein the oxygen content is reduced to below 10 vol % of gas phase,
- b) heating the composition to a temperature in the range of 150° C. to 450° C. in the presence of a solvent, wherein the solvent has a boiling point of between 50° C. and 150° C. and wherein the amount of solvent is 0.1 kg to 10 kg per kg of thermoplastics, to obtain a drop in viscosity below 104 mPas of at least 50% by weight of the thermoplastics, based on the total content of the thermoplastics,
- c) separating solid and/or gaseous fractions of the composition at the surface of the mixture and/or the bottom of the reactor, and
- d) recovering liquefied thermoplastics from the reactor,
- wherein the solvent used in step b) is an aliphatic hydrocarbon.
2 more elements
Dependencies are inferred from the claim text.