INFLUÊNCIA DO BRANQUEAMENTO COM OZÔNIO E PERÓXIDO DE HIDROGÊNIO NO RENDIMENTO E QUALIDADE DE FIBRAS SECUNDÁRIAS

Ventorim, Gustavo; Colodette, Jorge L.

doi:10.5902/198050981827

RESUMO

Nesse estudo, foram avaliadas seqüências “Total Chlorine Free” (TCF) para o branqueamento de fibras secundárias provenientes de três fontes diferentes. As polpas foram branqueadas a um nível mínimo de alvura de 78% ISO, sendo que a quantidade necessária de reagentes e as suas principais propriedades foram avaliadas. A utilização do ozônio mostrou-se eficiente no branqueamento TCF, pois permitiu alcançar a alvura objetivo nos três tipos de polpas, por meio das seqüências (ZQ)P e (ZQ)(PO). As letras apresentadas nas seqüências de branqueamento possuem os seguintes significados: os estágios de ozônio, Z, seguido de uma quelação, Q, e um simples estágio de peróxido, P, ou um estágio de peróxido pressurizado com oxigênio (PO). E também reduziu significativamente a coordenada de cor b* e ligeiramente a fluorescência das polpas. Os resultados de rendimento para os processos avaliados nesse estudo foram afetados negativamente por estágios alcalinos, como oxigênio, O, P e (PO), em altas temperaturas e também pela origem das polpas de fibras secundárias.

Palavras-chave:
fibras secundárias; processos de branqueamento (TCF)

ABSTRACT

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.

Key words:
secondary fibers; bleaching process (TCF)

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REFERÊNCIAS BIBLIOGRÁFICAS

CANADIAN PULP AND PAPER ASSOCIATION (CPPA). Technical section standard test methods. Montreal, 1986.
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.
D’ALMEIDA, M.L.; CAHEN, R. Reciclagem de papel. O Papel, São Paulo, v.52, n.11, p. 131-135, 1991.
AIR PRODUCTS AND CHEMICALS. DALTON, A. I. Aperfeiçoamento na deslignificação de fibra contendo lignocelulose. Int. CI4 D21C 9/14. BRn. PI 9004674 A. 19 set. 1990; 10 set. 1991.
AIR PRODUCTS AND CHEMICALS. NADDEO, R.C; DALTON, A.I. 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. 1991.
AIR PRODUCTS AND CHEMICALS. NADDEO, R.C.; HRISTOFAS, K.; MAGNOTTA, V.L. Oxygen color stripping in secondary fibers recovery. Int. CI5 D21C 5/02. BRn. PI 9201920 A. 21 maio 1992; 5 jan. 1993a.
AIR PRODUCTS AND CHEMICALS. NADDEO, R.C.; HRISTOFAS, K. ; MAGNOTTA, V.L. Dye removal in oxygen color stripping of secondary fibers. Int. CI5 D21C 5/02. USn.5,211,809. 21 May 1991; 18 May 1993b.
AIR PRODUCTS AND CHEMICALS. NADDEO, R.C.; HRISTOFAS, K.; MAGNOTTA, V.L. 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.
AIR PRODUCTS AND CHEMICALS. NADDEO, R.C.; HRISTOFAS, K. ; MAGNOTTA, V.L. Dye stripping by oxygen in secondary fiber recovery. Int. CI5 D21C 5/02. USn. 5,324,390. 3 Mar. 1993; 26 Jul. 1994b.
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.
PATT, R. et al. New approaches in bleaching of recycled fibers. Tappi Journal, Atlanta, v.79, n.12, p. 143-151, 1996.
SINGH, R.P. Bleaching. In: HENMILTON, F., LEOPODO, B. (Eds.). Pulp and paper manufacture. 3.ed. Atlanta: Tappi, 1987. v.3, p.234 - 237.
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).
TECHNICAL ASSOCIATION OF THE PULP AND PAPER INDUSTRY (TAPPI). Test methods. Atlanta, 1998-1999.

Datas de Publicação

Publicação nesta coleção
Jan-Mar 2005

Histórico

Recebido
20 Dez 2002
Aceito
09 Mar 2005

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

[1] CANADIAN PULP AND PAPER ASSOCIATION (CPPA). Technical section standard test methods. Montreal, 1986.

[2] 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.

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

[4] AIR PRODUCTS AND CHEMICALS. DALTON, A. I. Aperfeiçoamento na deslignificação de fibra contendo lignocelulose. Int. CI4 D21C 9/14. BRn. PI 9004674 A. 19 set. 1990; 10 set. 1991.

[5] AIR PRODUCTS AND CHEMICALS. NADDEO, R.C; DALTON, A.I. 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. 1991.

[6] AIR PRODUCTS AND CHEMICALS. NADDEO, R.C.; HRISTOFAS, K.; MAGNOTTA, V.L. Oxygen color stripping in secondary fibers recovery. Int. CI5 D21C 5/02. BRn. PI 9201920 A. 21 maio 1992; 5 jan. 1993a.

[7] AIR PRODUCTS AND CHEMICALS. NADDEO, R.C.; HRISTOFAS, K. ; MAGNOTTA, V.L. Dye removal in oxygen color stripping of secondary fibers. Int. CI5 D21C 5/02. USn.5,211,809. 21 May 1991; 18 May 1993b.

[8] AIR PRODUCTS AND CHEMICALS. NADDEO, R.C.; HRISTOFAS, K.; MAGNOTTA, V.L. 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.

[9] AIR PRODUCTS AND CHEMICALS. NADDEO, R.C.; HRISTOFAS, K. ; MAGNOTTA, V.L. Dye stripping by oxygen in secondary fiber recovery. Int. CI5 D21C 5/02. USn. 5,324,390. 3 Mar. 1993; 26 Jul. 1994b.

[10] 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.

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

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

[13] 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).

[14] TECHNICAL ASSOCIATION OF THE PULP AND PAPER INDUSTRY (TAPPI). Test methods. Atlanta, 1998-1999.

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