Process of recovering components from polyester resins
US5414022A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 10, 1994 |
| Grant date | May 9, 1995 |
| Priority date | — |
| Expiry date | Mar 10, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02W30/62
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
There is described a process and optimal conditions for depolymerizing polyester into its components and separating the components using apparatus comprising: PA1 a dissolver for receiving polyester, PA1 a reactor for depolymerizing polyester into components, and PA1 a rectifier for separating polyester components; the process comprising the steps of: PA2 a) adding polyester to the dissolver and combining it with melt from the reactor and liquid from the rectifier to reduce the chain length of the polyester, PA2 b) transferring reduced chain length polyester from the dissolver to the reactor, PA2 c) passing super-heated methanol through the reactor to depolymerize polyester into its constituent monomers; PA2 d) transferring depolymerization products from the reactor to the rectifier; and PA2 e) separating the depolymerization products in the rectifier into a vapor phase containing component monomers and a liquid phase containing higher molecular weight materials.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.