Purification of ethylene glycol recovered from polyester resins
US5672780A · kind A · utility
1Cited by
10References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 26, 1996 |
| Grant date | Sep 30, 1997 |
| Priority date | — |
| Expiry date | Jul 26, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C29/80
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
There is described a process for removing dimethyl terephthalate contaminants from ethylene glycol. The process comprises distilling ethylene glycol in the presence of an ester exchange catalyst to cause reaction between ethylene glycol and dimethyl terephthalate to form compounds that are less volatile than either ethylene glycol or dimethyl terephthalate, such as bishydroxyethyl terephthalate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.