Final chlorine dioxide stage at near-neutral pH for bleaching eucalypt pulp

Química Nova

Robisnéa A. Ribeiro²  Fernando J. B. Gomes²  José N. Floriani¹  Renato A. P. Damásio²  Iara F. Demuner²  Jorge L. Colodette² 

[1] ,Universidade Federal de Viçosa Departamento de Engenharia Florestal Viçosa MG ,Brasil

关键词: eucalyptus;    bleaching;    buffering;    pulp;   

DOI  :  10.5935/0100-4042.20140251

来源: SciELO

【 摘 要 】

It is well known that pH is an important parameter for controlling the eucalyptus pulp bleaching when using the final chlorine dioxide stage, since it affects the effectiveness of the process. Recommendations found in the literature for operating are in the 3.5 to 4.0 range. However, in this paper it was shown that final chlorine dioxide has better performance, with significant brightness gain while also preserving pulp quality, when it is operated at near neutral pH. This result can be explained by the generation of sodium bicarbonate in situ upon adding carbon dioxide at this stage.

【 授权许可】

CC BY-NC   
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