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

• Autor(a) principal: Rabelo,Marcos Sousa
• Data de Publicação: 2009
• Outros Autores: Silva,Vanessa Lopes, Barros,Denise Pires de, Colodette,Jorge Luiz, Sacon,Vera Maria, Silva,Marcelo Rodrigues da
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Química Nova (Online)
• Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422009000500002
• topic: hydrogen peroxide; molybdenum; pulp bleaching

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.