Kraft pulp bleaching with molybdenum activated acid peroxide (P Mo stage)

Quimica nova

Rabelo, Marcos Sousa¹  Colodette, Jorge Luiz²  Barros, Denise Pires de²  Silva, Vanessa Lopes²  Sacon, Vera Maria³  Silva, Marcelo Rodrigues da³ 

[1] Serviço Nacional de Aprendizagem Industrial, Lauro de Freitas, Brasil;Universidade Federal de Viçosa, Viçosa, Brasil;Votorantim Celulose e Papel, Jacareí, Brasil

关键词: hydrogen peroxide;    molybdenum;    pulp bleaching.;   

DOI  :  10.1590/S0100-40422009000500002

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

Optimum conditions to run the PMo stage for bleaching eucalyptus kraft pulp were 90 ºC, pH 3.5, 2 h, 0.1 kg/t Mo and 5 kg/t H2O2. The PMo stage efficiency increased with decreasing pH (1.5-5.5) and increasing temperature (75-90 ºC), time (2-4 h), and hydrogen peroxide (3-10 kg/t) and molybdenum concentration (0.1-0.4 kg/t). The implementation of the PMo stage, as replacement for the A stage, decreased total active chlorine demand of the OAZDP sequence by 6 kg/t to reach 90% ISO, both in laboratory and mill scale. Such practice resulted in decreased bleaching chemical costs to produce fully bleached pulp of 90% ISO.

【 授权许可】

CC BY