Bleaching of chemical paper pulp under sulphonating conditions

Details Bleaching of chemical paper pulp under sulphonating conditions Bleaching of chemical paper pulp under sulphonating conditions

D - Textiles, Paper

21

C

D21C 9/10 (2006.01)

Patent

CA 2194290

Method of bleaching chemical paper pulp, preferably entirely without using chlorine, in a bleaching sequence which comprises at least one acidic, sulphite-containing, reducing bleaching stage and at least one alkaline, oxidizing bleaching stage in arbitrary order. At least one of the said acidic, sulphite-containing, reducing bleaching stages is carried out under conditions which are in the main sulphonating to a degree of sulphonation exceeding 10 %, preferably exceeding 20 %, and even more preferably to 40-80 %.

Procédé de blanchiment de pâte à papier chimique, n'utilisant de préférence pas de chlore, dans une séquence de blanchiment comprenant au moins une étape de blanchiment réducteur acide contenant un sulfite et au moins une étape de blanchiment oxydant alcalin, dans un ordre quelconque. Au moins l'une de ces étapes de blanchiment acides contenant un sulfite s'effectue dans des conditions qui sont principalement de sulfonation à un degré de sulfonation supérieur à 10 %, de préférence supérieur à 20 %, et idéalement compris entre 40 et 80 %.

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