Wood pulping with acetic acid with the addition of formic acid

Details Wood pulping with acetic acid with the addition of formic acid Wood pulping with acetic acid with the addition of formic acid

1995-10-06

2000-10-31

Alvo, Steven

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Continuous chemical treatment or continuous charging or...

162 76, D21C 304, D21C 320

Patent

active

061396834

ABSTRACT:
In a process for the extraction of celluloses from lignocelluloses, the extraction is carried out by means of heating with aqueous acetic acid under pressure and the addition of formic acid, whereby there is obtained a cellulose with a very low residual lignin content, which can be bleached with ozone and peracetic acid to high grades of white, and acetic and formic acid are recovered by means of distillation, so that waste waters do not, therefore, accumulate.

REFERENCES:
patent: 2645633 (1953-07-01), Richmond et al.
patent: 3553076 (1971-01-01), Haas et al.
patent: 4904342 (1990-02-01), Arnoldy et al.
Plooy, "Non-Chlorine bleaching of chemical pulp-A development study", Natl. Timber Inst. Apr. 1984.

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