Wood pulping with acetic acid with the addition of formic acids

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

D - Textiles, Paper

21

C

D21C 3/04 (2006.01) D21C 3/00 (2006.01) D21C 3/24 (2006.01)

Patent

CA 2104765

ABSTRACT OF THE INVENTION 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.

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