Method for the simultaneous delignification of wood and other ligno-cellulosic materials and hydrolysis of the hemicellulose component thereof
US4511433A · kind A · utility
35Cited by
3References
16Claims
0Family size
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Key dates
| Filing date | Jul 27, 1984 |
| Grant date | Apr 16, 1985 |
| Priority date | — |
| Expiry date | Jul 27, 2004 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21C11/0042
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A method for delignifying ligno-cellulosic materials and efficiently separate from each other the constituents thereof. Said materials are heated in an aqueous acid medium in the presence of phenol compounds. Then the reaction medium is drained and washed for isolating the purified solid cellulose pulp, the liquid phase separating into two layers: an aqueous layer rich with pentoses and an organic layer rich with phenols and lignin, the latter providing, by distillation and pyrolysis of the residue, a quantity of phenols at least equal to that of the phenols used in the delignification stage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.