Recycling polyester and recovering glycols
US5744503A · kind A · utility
12Cited by
24References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 1, 1996 |
| Grant date | Apr 28, 1998 |
| Priority date | — |
| Expiry date | Feb 1, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C29/86
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for recovering glycols produced during recycling of polyester comprising the step of extracting aromatic contaminants from the glycols. Extracting the aromatic contaminants is accomplished by: providing a glycol rich stream from a process to recycle polyester. The glycol rich stream comprised glycols, water, and aromatic contaminants. A solvent is added to the glycol rich stream to form a mixture. The mixture is resolved to form a glycol rich component and an aromatic contaminant rich component. The glycols are recovered from the glycol rich component.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.