Low energy production process for producing paper pulp from lignocellulosic biomass
US11624152B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 13, 2018 |
| Grant date | Apr 11, 2023 |
| Priority date | — |
| Expiry date | Feb 26, 2039 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10J2300/092
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A low energy production process for producing paper pulp from lignocellulosic biomass, the process comprising the following successive steps: a) extracting lignins and hemicellulose from lignocellulosic biomass by putting at least one solid lignocellulosic raw material in the presence of a mixture, composed only of water and of formic acid, at atmospheric pressure and under controlled conditions of reaction temperature between ambient temperature and the reflux temperature of the mixture at atmospheric pressure, preferably between 80° C. and 100° C., with a weight ratio of the at least one solid lignocellulosic raw material/liquid mixture comprised between 1/1 and 1/15, and for a determined period of time of reaction; and b) separating, at atmospheric pressure and at the reaction temperature, a solid fraction, constituting raw paper pulp, from an organic phase containing in solution at least the starting formic acid and water mixture, solubilized monomeric and polymeric sugars, lignins.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.