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

Quimica nova

Damásio, Renato A. P.¹  Demuner, Iara F.¹  Ribeiro, Robisnéa A.¹  Colodette, Jorge L.¹  Gomes, Fernando J. B.¹  Floriani, José N.² 

[1] Universidade Federal de Viçosa, Viçosa, Brasil;White Martins, Rio de Janeiro, Brasil

关键词: eucalyptus;    bleaching;    buffering;    pulp.;   

DOI  :  10.5935/0100-4042.20140251

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 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