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vol.15 número1EFEITOS DA LUZ E DA TEMPERATURA NA GERMINAÇÃO DE SEMENTES DE Tabebuia serratifolia (Vahl) Nich, Tabebuia chrysotricha (Mart. ex DC.) Standl. E Tabebuia roseo-alba (Ridl) Sand - BignoniaceaeCARACTERIZAÇÃO DO SETOR FLORESTAL: UMA ABORDAGEM COMPARATIVA COM OUTROS SETORES DA ECONOMIA índice de autoresíndice de assuntospesquisa de artigos
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Ciência Florestal

versão impressa ISSN 0103-9954versão On-line ISSN 1980-5098

Resumo

VENTORIM, Gustavo  e  COLODETTE, Jorge L.. INFLUENCE OF BLEACHING WITH OZONE AND PEROXIDO OF HYDROGEN IN THE YIELD AND QUALITY OF SECONDARY FIBERS. Ciênc. Florest. [online]. 2005, vol.15, n.1, pp.93-103. ISSN 1980-5098.  https://doi.org/10.5902/198050981827.

In this study, Total Chlorine Free (TCF) bleaching processes were evaluated for bleaching a secondary fiber of different origens. The samples were bleached to a target brightness of 78 % ISO. The results were interpreted on the basis of chemical cost to reach the target brightness, bleaching yield and bleached pulp quality as measured by viscosity, fluorescence and b* color coordinate. The ozone stage was responsible for improve TCF bleaching performance. The pulp bleached by sequences contained an ozone stage followed by chelation, without interstage washing (ZQ), and a final hydrogen peroxide stage unpressurized (P) or pressurized with oxygen (PO), designed as (ZQ)(PO) showed good results. These sequences decreased pulp b* coordinate significantly and fluorescence slightly. For all three bleaching processes, it was determined that process yield is negatively affected by hot alkaline stages such as oxygen, O, peroxide, P, and peroxide pressurized with oxygen, (PO) and also for the origin of the pulps of secondary fibers.

Palavras-chave : secondary fibers; bleaching process (TCF).

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