Delignification of lignocellulosic materials with 2-imidazolidinones and 2-oxazolidinones
US4462865A · kind A · utility
5Cited by
4References
17Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 30, 1981 |
| Grant date | Jul 31, 1984 |
| Priority date | — |
| Expiry date | Sep 30, 2001 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21C3/003
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Lignocellulosic materials are separated into usable lignin and cellulose fractions by contacting said materials with a 2-oxazolidinone (or a 2-imidazolidinone) in weight ratios of at least 1:0.1, respectively, at a temperature between 200.degree. C. and 250.degree. C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.