Method for bleaching paper pulp with organic peracids...

Details Method for bleaching paper pulp with organic peracids... Method for bleaching paper pulp with organic peracids...

2005-03-15

2005-03-15

Alvo, Steve (Department: 1731)

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With squeezing, compression, rubbing, kneading

C076S078100

Reexamination Certificate

active

06866749

ABSTRACT:
The invention concerns a method for bleaching different types of paper pulp in two steps at atmospheric pressure and at a temperature not higher than 100 DEG C. The first step consists in contacting the unbleached paste with a mixture of paracetic acid and performic acid. The second step consists in treating the bleached pulp derived from the first step, with a solution of soda and hydrogen peroxide. The resulting pulps exhibit a high index of whiteness and a degree of polymerisation close to unbleached pulps. The method is environmentally safe and non-polluting.

REFERENCES:
patent: 4400237 (1983-08-01), Kruger et al.
patent: 5431781 (1995-07-01), Walsh
patent: 6007678 (1999-12-01), Linsten et al.
patent: WO 98 20198 (1998-05-01), None

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