Process for bleaching and delignifying cellulose-containing prod

Details Process for bleaching and delignifying cellulose-containing prod Process for bleaching and delignifying cellulose-containing prod

1986-12-09

1991-07-23

Simmons, David A.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Gas, vapor or mist contact

162 76, 162 78, 162 79, 162 80, 162 90, D21C 300

Patent

active

050340964

ABSTRACT:
The present invention provides a process for bleaching and delignifying cellulose-containing products with peroxides and/or oxygen and/or ozone, wherein there is additionally used 0.01 to 2.5% by weight of cyanamide and/or cyanamide salts, referred to the dry weight of the cellulose.

REFERENCES:
patent: 4025453 (1977-05-01), Kravetz et al.
patent: 4158595 (1979-06-01), Rave
patent: 4426466 (1984-01-01), Schwartz

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