Cellulose fiber-based filters
US7582213B2 · kind B2 · utility
5Cited by
60References
5Claims
0Family size
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Key dates
| Filing date | May 16, 2006 |
| Grant date | Sep 1, 2009 |
| Priority date | — |
| Expiry date | Jan 10, 2027 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/1324
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The present invention comprises an improved method for refining cellulose that produces a highly refined cellulosic material. The method comprises soaking raw material in a mild NaOH using reduced temperatures and pressures, and refining the material with a plate refiner so that a waste water stream is reduced in volume and has a pH within a range of 8 to 9. The present invention also comprises a HRC gel having a lignin concentration of at least about one (1)% by weight, and a water retention capacity of about 25 to at least about 56 g H2O/g dry HRC.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.