Process and composition for bleaching cellulosic material with hypochlorous acid
US4740212A · kind A · utility
13Cited by
15References
24Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 25, 1985 |
| Grant date | Apr 26, 1988 |
| Priority date | — |
| Expiry date | Nov 25, 2005 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21C9/12
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A process and composition especially suited for bleaching wood pulp characterized by the use of hypochlorous acid in combination with chlorine dioxide and/or a nitrogen compound having the characteristic of minimizing fiber degradation and enhancing fiber brightness. The preferred composition is in an aqueous solution adjusted to an optimum pH and is used as a direct replacement for conventional compositions so as to effect substantial savings in the costs of chemicals and energy per ton of bleached pulp.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.