Process and apparatus for making low molecular weight cellulose ethers
US6261218A · kind A · utility
6Cited by
10References
13Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 1, 1998 |
| Grant date | Jul 17, 2001 |
| Priority date | — |
| Expiry date | Dec 1, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08B11/20
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
There is a process for making a cellulose ether. The process comprises the following: a) alkalyzing a cellulose pulp; b) etherifying the alkalyzed cellulose pulp to form a cellulose ether; c) washing the cellulose ether; d) drying the cellulose ether; e) milling the cellulose ether to a particulate form; f) heating the particulate cellulose ether; g) tumbling the particulate cellulose ether while simultaneously contacting it with an acid to partially depolymerize it to a lower molecular weight; h) partially or substantially neutralizing the acid. There is also an apparatus for making the cellulose ether.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.