Branqueamento de polpa celulósica kraft de eucalipto com peróxido ácido ativado por molibdênio

Química Nova

Marcos Sousa Rabelo²  Vanessa Lopes Silva¹  Denise Pires De Barros¹  Jorge Luiz Colodette¹  Vera Maria Sacon¹  Marcelo Rodrigues Da Silva¹ 

[1] ,Serviço Nacional de Aprendizagem Industrial Departamento Regional da Bahia Lauro de Freitas BA ,Brasil

关键词: hydrogen peroxide;    molybdenum;    pulp bleaching;   

DOI  :  10.1590/S0100-40422009000500002

来源: SciELO

【 摘 要 】

Optimum conditions to run the P Mo 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 P Mo 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 P Mo 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】

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