Method to regenerate gas mixture in ozone-bleaching process
US6059925A · kind A · utility
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6References
9Claims
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Key dates
| Filing date | Aug 8, 1997 |
| Grant date | May 9, 2000 |
| Priority date | — |
| Expiry date | Aug 8, 2017 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21C11/0071
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A method of treating cellulose pulp which is subjected to an oxygen-delignification stage (3), a washing stage (4), an ozone-bleaching stage (1) and a further bleaching stage, for instance a peroxide-bleaching stage (7). A gas mixture of oxygen and ozone is delivered to the ozone-bleaching stage (1). The used gas mixture is regenerated, i.e. freed from carbon dioxide, and returned to the oxygen-delignification stage (3) and/or to a bleaching stage (7).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.