BRANQUEAMENTO ECF E TCF DE CELULOSE DE FIBRAS SECUNDÁRIAS

Ventorim, Gustavo; Colodette, Jorge L.; Costa, Marcelo M. da; Brito, Ana Campos de

doi:10.5902/19805098383

RESUMO

Neste estudo foram avaliadas seqüências ECF e TCF para o branqueamento de celulose de fibras secundárias destintadas provenientes de uma mistura de composição conhecida de lixo de escritório (MOW) e produzidas em planta piloto. A polpa foi branqueada a um nível mínimo de alvura de 78% ISO, sendo que o requerimento de reagentes e as principais propriedades da polpa foram avaliadas. Dentre as seqüência ECF, a mais atrativa foi a DEDD que apresentou o mais baixo custo e ainda eliminou toda a fluorescência e grande parte da coordenada de cor b* da polpa. As seqüências ECF resultaram em polpas de alta viscosidade em relação às convencionais. A seqüência TCF com ozônio mais atrativa foi a Q(PO)(ZQ)(PO) que se mostrou flexível quanto ao teto de alvura, além de reduzir significativamente a coordenada de cor b* e ligeiramente a fluorescência da polpa. A melhor seqüência TCF sem-ozônio Q(PO)Q(PO) apresentou-se pouco flexível quanto ao teto de alvura e teve pouco efeito na fluorescência e coordenada de cor b* da polpa. As viscosidades finais das polpas, branqueadas pelos processos TCF, foram aceitáveis. Os resultados de rendimento, para os processos avaliados nesse estudo, foram afetados negativamente por estágios alcalinos, como O, P e (PO), em alta temperatura.

Palavras-chave:
Fibras secundárias; processos de branqueamento (ECF e TCF)

ABSTRACT

In this study, ECF and TCF bleaching processes were evaluated for the bleaching of a deinked mixed office waste (MOW) pulp sample produced in a pilot plant. The sample was bleached by all processes to a target brightness of 78 % ISO minimum. 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. Among the ECF sequences, the mosattractive was the DEDD which showed the lowest chemical cost and produced bleached pulp of high quality as measured by viscosity, fluorescence and b* coordinate. The best TCF sequence with ozone was the Q(PO)(ZQ)(PO) which resulted in very high brightness ceiling. This sequence decreased moderately the pulp b* coordinate and viscosity and slightly its fluorescence. Among the TCF sequences without ozone the Q(PO)Q(PO) was the most effective but showed poor flexibility with regard to brightness ceiling. This sequence had little effect on pulp viscosity, fluorescence and b* coordinate. For all three bleaching processes, it was determined that process yield is negatively affected by hot alkaline stages such as O, P and (PO).

Key-word:
Secondary fibers; bleaching process (conventional; ECF and TCF)

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REFERÊNCIAS BIBLIOGRÁFICA

AIR PRODUCTS AND CHEMICALS, Ronald Charles Naddeo, Augustine Ivanhoe Dalton. Processo de descoramento e alvejamento de polpa compreendendo fibra celulósica secundária. Int. CI⁴ D21C 9/14. BRn. PI 9004623 A. 17 set. 1990; 10 set. 1991a.
AIR PRODUCTS AND CHEMICALS, Augustine Ivanhoe Dalton. Aperfeiçoamento na deslignificação de fibra contendo lignocelulose. Int. CI⁴ D21C 9/14. BRn. PI 9004674 A. 19 set. 1990; 10 set. 1991b.
AIR PRODUCTS AND CHEMICALS, Ronald Charles Naddeo, Konstantinos Hristofas, Vincent Louis Magnotta. Oxygen color stripping in secondary fibers recovery. Int. CI⁵ D21C 5/02. BRn. PI 9201920 A. 21 maio 1992; 5 jan. 1993 a .
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Datas de Publicação

Publicação nesta coleção
Jul-Dec 1999

Este é um artigo publicado em acesso aberto sob uma licença Creative Commons

[1] AIR PRODUCTS AND CHEMICALS, Ronald Charles Naddeo, Augustine Ivanhoe Dalton. Processo de descoramento e alvejamento de polpa compreendendo fibra celulósica secundária. Int. CI⁴ D21C 9/14. BRn. PI 9004623 A. 17 set. 1990; 10 set. 1991a.

[2] AIR PRODUCTS AND CHEMICALS, Augustine Ivanhoe Dalton. Aperfeiçoamento na deslignificação de fibra contendo lignocelulose. Int. CI⁴ D21C 9/14. BRn. PI 9004674 A. 19 set. 1990; 10 set. 1991b.

[3] AIR PRODUCTS AND CHEMICALS, Ronald Charles Naddeo, Konstantinos Hristofas, Vincent Louis Magnotta. Oxygen color stripping in secondary fibers recovery. Int. CI⁵ D21C 5/02. BRn. PI 9201920 A. 21 maio 1992; 5 jan. 1993 a .

[4] AIR PRODUCTS AND CHEMICALS, Ronald Charles Naddeo, Konstantinos Hristofas, Vincent Louis Magnotta. Dye removal in oxygen color stripping of secondary fibers. Int. CI⁵ D21C 5/02. USn. 5,211,809. 21 May 1991; 18 May 1993b.

[5] AIR PRODUCTS AND CHEMICALS, Ronald Charles Naddeo, Konstantinos Hristofas, Vincent Louis Magnotta. Dye stripping by oxygen and peroxide in secondary fiber recovery. Int. CI⁵ D21C 5/02. USn. 5,324,390. 2 Mar. 1993; 28 June 1994a.

[6] AIR PRODUCTS AND CHEMICALS, Ronald Charles Naddeo, Konstantinos Hristofas, Vincent Louis Magnotta. Dye stripping by oxygen in secondary fiber recovery. Int. CI⁵ D21C 5/02. USn. 5,324,390. 3 Mar. 1993; 26 Jul. 1994b.

[7] AXEGARD, P. Improvement of bleach plant effluent by cutting black on Cl₂ Pulp Paper Canada, 90(5): T183-T187, 1989.

[8] COLODETTE, J.L. Factors affecting hydrogen peroxide stability in the brightening of mechanical and chemimechanical pulps. 273 p. Tese (Doctor of Philosophy) - New York: Syracuse State University, 1986.

[9] COLODETTE, J.L. et al Factors affecting kraft pulp bleachability with oxygen derived chemicals. In: NON-CHLORINE BLEACHING CONFERENCE, 1996, Orlando. Anais... Orlando, 1996, 20p.

[10] D’ALMEIDA, M.L.; CAHEN, R. Reciclagem de papel. O Papel, São Paulo, v.52, n. 11, p. 131-135, 1991.

[11] JENNINGS, J.P. et al Characterization of a commercial oxygen-bleaching stage in a mill recycling mixed office wastepaper. Tappi Journal, v.79, n.7, p. 119-125, 1996.

[12] MARKHAM, L.D., COURCHENE, C.E. Oxygen bleaching of secondary fiber grades. In: PULPING CONFERENCE, 1988, Atlanta. Anais... Atlanta: Tappi, 1988. v.1, p. 189-196.

[13] NADDEO, R.C. et al Oxidative methods offer alternative to chlorine bleaching of wasterpper. Pulp and Paper, Atlanta, v.66, n.11, p. 71-81,1992.

[14] PARTHASARATHY, V.R. Elemental chlorine free (ECF) and totally chlorine free (TCF) bleaching of colored broke. Tappi Jounal, Atlanta, v.80, n.7, p. 159-169, 1997.

[15] PATT, R. et al New approaches in bleaching of recycled fibers. Tappi Journal, Atlanta, v.79, n.12, p. 143-151, 1996.

[16] SINGH, R.P. Bleaching. In: HENMILTON, F.; LEOPODO, B. (Eds.). Pulp and paper manufacture. 3.ed. Atlanta: Tappi , 1987. v.3, p.234 - 237.

[17] STUS, W.L. Color stripping of recycled wood-free papers using ozone. Kalamazoo, Michigan: Western Michigan University, 1996. 59p. (A Thesis to requirements for the Senior Design PAPR 473 Course).

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