Method to convert mechanical pulp derived waste material into value added cellulose products
US11486094B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 1, 2018 |
| Grant date | Nov 1, 2022 |
| Priority date | — |
| Expiry date | Jul 17, 2039 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02W30/64
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
According to an example aspect of the present invention, there is provided a process for the conversion of cellulosic waste material into a recycled cellulose product comprising the steps of cooking the waste material in a cooking liquor to remove lignin from the waste material and provide a delignified pulp, dissolving the delignified pulp in an ionic liquid to provide a spinning dope suitable for dry jet-wet spinning in an ionic liquid solution, and subjecting the spinning dope to a further processing step to provide a recycled cellulose product, said further step selected from the group of spinning cellulose fibers for use in textiles from the solution, extruding a film product for use in packaging, regenerating the dope as a hydrogel and regenerating the dope as an aerogel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.