Purification process for partly-hydrolyzed cellulose
US9567707B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 21, 2012 |
| Grant date | Feb 14, 2017 |
| Priority date | — |
| Expiry date | Dec 28, 2032 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21C11/0007
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A method of recovering purified partly-hydrolyzed cellulose (36) from a composition (14) comprising partly-hydrolyzed cellulose and an acid, such as sulfuric acid. A base (28) having a cation that forms a precipitate with the anion of the acid is added to the composition. For example, a base such as barium hydroxide is added to form a sulfate precipitate. The precipitate (38) is then separated from the partly-hydrolyzed cellulose (36), thus reducing its acid content. The method may include additional steps of centrifugation (18) of the composition, breaking-up agglomerations (44) in the composition after precipitation, and dialysis (42).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.