Location of Repository

Branqueamento de polpa celulósica kraft de eucalipto com peróxido ácido ativado por molibdênio Kraft pulp bleaching with molybdenum activated acid peroxide (P Mo stage)

By Marcos Sousa Rabelo, Vanessa Lopes Silva, Denise Pires de Barros, Jorge Luiz Colodette, Vera Maria Sacon and Marcelo Rodrigues da Silva

Abstract

<abstract language="eng">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

Topics: hydrogen peroxide, molybdenum, pulp bleaching, Chemistry, QD1-999, Science, Q, DOAJ:Chemistry (General), DOAJ:Chemistry
Publisher: Sociedade Brasileira de Química
Year: 2009
DOI identifier: 10.1590/S0100-40422009000500002
OAI identifier: oai:doaj.org/article:8e086a4e9cd74d80b5aad5a5f9a6217f
Journal:
Download PDF:
Sorry, we are unable to provide the full text but you may find it at the following location(s):
  • https://doaj.org/toc/1678-7064 (external link)
  • https://doaj.org/toc/0100-4042 (external link)
  • http://www.scielo.br/scielo.ph... (external link)
  • https://doaj.org/article/8e086... (external link)
  • Suggested articles


    To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.