Method for producing paper pulp, lignins, sugars and acetic acid by frantionation of lignocellulosic vegetable material in formic/acetic acid medium
US7402224B1 · kind B1 · utility
15Cited by
1References
17Claims
0Family size
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Key dates
| Filing date | May 6, 1999 |
| Grant date | Jul 22, 2008 |
| Priority date | — |
| Expiry date | May 6, 2019 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21C3/20
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A method for producing paper pulp from a lignocellulosie vegetable raw material. The method includes contacting the raw material with a mixture of formic acid and acetic acid (in an amount more than 5 wt. % of the mixture) at a temperature and for a suitable reaction time, the whole being performed at room temperature. The paper pulp is separated from the organic phase and optionally bleached with ozone. The organic phase is treated to enable the recycling of the formic and acetic acids and the extraction of lignins, sugars and excess acetic acid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.