EVALUATION OF THE EFFECT OF VARIABLES PROCESS OF CELLULOSIC PULP BLEACHING WITH HYDROGEN PEROXIDE
DOI:
https://doi.org/10.5902/1980509833463Keywords:
chlorine dioxide, pressurized peroxide, kappa number.Abstract
The bleached pulp market has been working to promote brightness levels at values of 92% ISO respecting, however, environmental standards and seeking for less aggressive processes. Then, the additional chlorine dioxide that would be necessary to lift brightness has been replaced by hydrogen peroxide. The present study aimed to evaluate the influence of hydrogen peroxide charge, pressure and temperature variation in the bleaching sequence D0(E+P)D1(P+O). It was used industrial kraft pulp, from hybrid of Eucalyptus urophylla X Eucalyptus grandis, oxygen-delignified, whose initial characteristics were: brightness 61.8% ISO, viscosity 36,9 cP and kappa number 8.9. The last stage (P+O) was performed varying the hydrogen peroxide charge (3 kg/t and 6 kg/t), temperature (95°C and 105°C) and pressure (0 atm and 5 atm). To evaluate the effect of such variations over cellulosic pulp, viscosity, brightness and brightness reversion tests were carried out according to TAPPI standards. In general, increase of hydrogen peroxide charge (from 3 kg/t to 6 kg/t) propitiated a small increasing on brightness values and a small viscosity decreasing on the cellulosic pulp. The increase of 10°C in temperature had a positive effect on brightness parameter, increasing the respective values, on the other hand, for the viscosity analysis the achieved values showed a reduction tendency. For the variation of oxygen pressure it was also observed brightness increasing and viscosity decreasing.
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References
COLODETTE, J. L. Peroxide delignification and bleaching. In: ANNUAL NON-CHLORINE BLEACHING CONFERENCE, 3., 1994, Amelia Island. Proceedings… Amelia Island: [s. n.], 1994.
COLODETTE, J. L. et al. Aumentando a seletividade e eficiência no branqueamento com oxigênio pelo uso do metanol. O Papel, São Paulo, v. 54, n. 4, p. 26-36, 1993.
COMELATO, J. S. Efeito de reagentes de branqueamento nas propriedades físicas e mecânicas da polpa de celulose kraft de eucalipto. 2011. 113 f. Dissertação (Mestrado em Engenharia Mecânica – Materiais Lignocelulósicos) – Faculdade de Engenharia do Campus de Guaratinguetá, Universidade Estadual Paulista, Guaratinguetá, 2011.
COSTA, M. M. et al. Low environmental impact bleaching sequences for attaining high brightness level with eucalyptus spp pulp. Brazilian Journal of Chemical Engineering, São Paulo, v. 26, n. 1, p. 11-22, jan./mar. 2009.
EIRAS, K. M. M. et al. New insights on brightness stability of eucalyptus kraft pulp. Nordic Pulp and Paper Research Journal, Sundsvall, v. 23, n. 1, p. 102-107, jan. 2008.
GERMGÄRD, U.; NORDEN, S. OZP-Bleaching of kraft pulps to full brightness. In: INTERNATIONAL PULP BLEACHING CONFERENCE, 1994, Vancouver. Proceedings… Montreal: CPPA, 1994.
IGERUD, L. Mill experiences of Lignox bleaching. In: SUNDS DEFIBRATOR TECHNICAL SEMINAR, 9., 1992, Williamsburg. Proceedings… Williamsburg: [s. n.], 1992. p. 1-12.
KVAERNER PULPING TECHNOLOGIES AB (Sweden). Petter Tibbling; Ulla Ekström; Erik Nilsson; Lars-Ove Larsson. Process for peroxide bleaching of chemical pulp in a pressurized bleach vassel. US 5571377A, 22 dec. 1994, 5 nov. 1996.
MALMBERG, B.; EDWARDS, L. Dynamic modeling of pressurized peroxide stages with application to full bleach plant simulation. Tappi Journal, Atlanta, v. 6, n. 2, p. 9-17, apr. 2007.
MILANEZ, A. F.; COLODETTE, J. L.; CARVALHO, A. M. M. L. Condições ótimas para branquear polpa kraft de eucalipto com uma seqüência de três estágios. Scientia Forestalis, Piracicaba, v. 36, n. 78, p. 105-113, jun. 2008.
MOTA, S. F. et al. Pressurized hydrogen peroxide bleaching of Eucalyptus globulus pulps. Part I: effect of process variables. Nordic Pulp and Paper Research Journal, Sundsvall, v. 22, n. 1, p. 17-22, jan. 2007.
MOTA, S. M. F.; FERREIRA, L. M. G. A.; CARVALHO, M. G. V. S. Pressurized hydrogen peroxide bleaching of Eucalyptus globulus pulps. Part two: kinects. Nordic Pulp and Paper Research Journal, Sundsvall, v. 22, n. 1, p. 23-27, jan. 2007.
NAVARRO, R. M. S. Estudo dos diferentes tipos de processos de branqueamento de celulose objetivando a comparação entre seus métodos e a geração do potencial de poluentes em seus respectivos efluentes. 2004. 111 f. Dissertação (Mestrado em Engenharia Química) – Faculdade de Engenharia Química, Universidade Estadual de Campinas, Campinas, 2004.
PEREIRA, E. R. Branqueamento de polpa kraft de eucalipto com perácidos e peróxido pressurizado. 1995. 70 f. Dissertação (Mestrado em Ciência Florestal) – Universidade Federal de Viçosa, Viçosa, MG, 1995.
PESSOTI, J. P.; COLODETTE, J. L.; ARAÚJO, G. A. T. Otimização da sequência O/ODED(PO)D de um processo industrial de branqueamento de polpa kraft de eucalipto. In: CONGRESSO ANUAL DE CELULOSE E PAPEL, 30., 1997, São Paulo. Anais... São Paulo: ABTCP, 1997. p. 149-159.
RAGNAR, M. Alkaline extraction and a control strategy for the chlorine dioxide charge to the final stage in DED bleaching. Nordic Pulp and Paper Research Journal, Sundsvall, v. 18, n. 2, p. 162-167, feb. 2003.
ROBLES, Y. A. M.; SOUZA L. C.; LEPORINI FILHO, C. Avaliação de diferentes tecnologias de branqueamento para obtenção de polpa kraft de eucalipto. O Papel, São Paulo, v. 67, n. 7, p. 62-78, jul. 2006.
SIQUEIRA, J. L. D.; SILVA FILHO, L. L. Branqueamento de polpa Kraft de eucalipto – O papel do peróxido de hidrogênio. In: COLÓQUIO INTERNACIONAL SOBRE CELULOSE KRAFT DE EUCALIPTO, 2003, Viçosa, MG. Anais... Viçosa, MG: UFV, 2003. CD-ROM.
TECHNICAL ASSOCIATION OF THE PULP AND PAPER INDUSTRY. Testing Procedures of Technical Association of the Pulp and Paper Industry. In: ______. Standard Method. Atlanta: TAPPI, 2001. CD-ROM.
VENSON, I. Estudos em deslignificação de polpas kraft de Pinus spp. com oxigênio e peróxido. 2008. 136 f. Tese (Doutorado em Engenharia Florestal) – Setor de Ciências Agrárias, Universidade Federal do Paraná, Curitiba, 2008.
