Method of oxygen bleaching with ferricyanide lignocellulosic material
US4622101A · kind A · utility
3Cited by
10References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 1, 1984 |
| Grant date | Nov 11, 1986 |
| Priority date | — |
| Expiry date | Oct 1, 2004 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21C9/147
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Delignifying bleaching of lignocellulosic materials, particularly wood pulps already partly delignified by conventional alkaline pulping processes by electrochemically generated ferricyanide in the presence of an effective amount of molecular oxygen is disclosed. Attainment of low kappa numbers employing milder temperature and pressure conditions than are employed in conventional oxygen bleaching is made possible and the process may be substituted for at least a portion of the conventional chlorine based bleaching processes which are current industry standard practice for bleaching kraft pulps.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.