Process for recycling polyethylene terephthalate process residues containing alkali metal organic salts
US5414107A · kind A · utility
6Cited by
13References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 20, 1994 |
| Grant date | May 9, 1995 |
| Priority date | — |
| Expiry date | Jul 20, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C67/60
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for recycling by-products produced from a process for the manufacture of polyethylene terephthalate is disclosed. The process includes the steps of: (a) providing ethylene glycol distillation bottoms from an ethylene glycol recovery unit associated with the manufacture of polyethylene terephthalate, the bottoms containing an alkali metal organic salt produced during the manufacture of polyethylene terephthalate, the alkali metal organic salt being in excess of about 100 ppm of the bottoms; (b) stripping the alkali metal from the organic acid by use of a strong acid; and (c) depolymerizing the organic acid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.