Fractionation of lignocellulosic material using ionic liquids
US8435355B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 29, 2008 |
| Grant date | May 7, 2013 |
| Priority date | — |
| Expiry date | Aug 18, 2030 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21C3/003
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Lignocellulosic biomass materials are fractionated by dissolving at least a portion of the lignocellulosic material in an ionic liquid and separating the resulting mixture into a cellulose-enriched fraction and/or a lignin-enriched fraction. The cellulose-enriched fraction contains about 10 percentage points more glucose than the weight percent glucose contained in the original lignocellulosic biomass material. In certain embodiments, the lignin-enriched fraction includes a lignin content that is 5 percentage points greater than the weight percent lignin present in the original lignocellulosic material. The techniques used to isolate the cellulose-enriched fractions and/or the lignin-enriched fractions from the ionic liquid mixture do not employ environmentally unfriendly solvents.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.