Purification process for partly-hydrolyzed cellulose
US10016726B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 28, 2014 |
| Grant date | Jul 10, 2018 |
| Priority date | — |
| Expiry date | May 11, 2034 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D61/423
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method of recovering purified partly-hydrolyzed cellulose particles from a composition comprising agglomerated partly-hydrolyzed cellulose particles and an acid, using electrodialysis. The invention addresses the problem of reducing the acid to very low levels while avoiding the high capital and operating costs, high water usage and large filtration surface area or dilution time requirements of the prior art processes. Following dilution, concentration by centrifuging or settling, and/or dialysis of the composition, the composition is treated in an electrodialysis cell to remove ions, such as free sulfate from sulfuric acid. The method may include having an anion exchange resin in the feed compartment of the electrodialysis cell, adding a base to the receiving solution in the electrodialysis cell, and a second step of electrodialysis of the purified partly-hydrolyzed cellulose particles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.