Process for bleaching pulps by means of organic per acid

Details Process for bleaching pulps by means of organic per acid Process for bleaching pulps by means of organic per acid

D - Textiles, Paper

21

C

8/82

D21C 9/16 (2006.01)

Patent

CA 1144711

ABSTRACT OF THE DISCLOSURE Pulps are bleached by an organic peracid in the acid range and subsequently by peroxide in the alkaline range. An acid produced from the corresponding carboxylic acid by reaction with hydrogen peroxide in the presence of a mineral acid is used as the peracid. The peroxide bleaching stage following the peracid bleaching stage is carried out after adding an amount of aqueous alkali solution required for carrying out the peroxide bleaching stage without intermediate washing of the cellulose of the pulp. No further peroxide is added.

370899

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