Process for the recycling of expanded polystyrene
US7728047B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 28, 2006 |
| Grant date | Jun 1, 2010 |
| Priority date | — |
| Expiry date | Jun 28, 2026 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02W30/62
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The invention relates to an enhanced process for the recycling of expanded polystyrene. Said process essentially comprises the reduction in volume of expanded polystyrene by means of dissolution in a solvent, separation of the insoluble components, selective precipitation of the polystyrene with an anti-solvent, separation, drying and extrusion of the precipitated polystyrene, recovery by distillation and recycling of the solvent. The process is characterized in that the anti-solvent is a butanol selected form n-butanol, iso-butanol or sec-butanol and the solvent is dimethyl carbonate, alone or in a mixture containing up to 25% by weight of butanol.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.