Depolymerization of polytetrahydrofuran derivatives
US6429321B1 · kind B1 · utility
2Cited by
0References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 21, 2001 |
| Grant date | Aug 6, 2002 |
| Priority date | — |
| Expiry date | Aug 21, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D307/38
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The invention discloses a method for depolymerization of a mixture containing polytetrahydrofuran derivatives, including heating the mixture comprising polytetrahydrofuran derivatives at 100-250° C. in the presence of a &bgr;-zeolite catalyst to obtain tetrahydrofuran, whereby the tetrahydrofuran monomer can be recovered from the waste materials in the preparation of polytetramethylene ether glycols.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.