Process for bleaching and delignification of lignocellulosic

Details Process for bleaching and delignification of lignocellulosic Process for bleaching and delignification of lignocellulosic

1989-08-18

1992-02-25

Alvo, Steve

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Gas, vapor or mist contact

162 78, 162 76, D21C 9147, D21C 916

Patent

active

050910540

ABSTRACT:
Delignification and bleaching of lignocellulosic material is enhanced after the pulp has been treated with peroxomonosulfuric acid. The starting pH of the reaction with peroxomonosulfuric acid is between 7 and 11, and the reaction is continued until a final pH of 3 to 5 obtained. Subsequently the pulp is delignified and bleached with peroxide and/or oxygen.

REFERENCES:
Liebergott, "Oxidative Bleaching-A Review", 69th Annual Meeting Tech. Sect. Canadian Pulp & Paper Assoc., Feb. 1 and 2, 1983 (162-89).
Zakis et al, "Action of Persulfate on Lignin, I", Translated from Khimiya Drevesiny (Rija) 9=109-117 (1971).
DuPont Data Sheet; "Oxone.RTM. Monopersulfate Compound", Oct. 1976.

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