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Effects of Hydrogen Peroxide Bleaching and Acetic Anhydride on Photodegradation of Hornbeam CMP Pulp
Corresponding Author(s) : Ramin Vaysi
Asian Journal of Chemistry,
Vol. 25 No. 3 (2013): Vol 25 Issue 3
Abstract
In this study, the effects of hydrogen peroxide bleaching and acetic anhydride as acetylation agent on photo degradation of hornbeam CMP pulp investigated. Hornbeam chips pulped under CMP conditions at the yield of 85 %. Then, one portion of pulp was bleached using hydrogen peroxide and DTPA as chelating agent and 60 g/m2 handsheets were made from bleached and unbleached pulp. A number of unbleached handsheets were acetylated using acetic anhydride at 80 ºC for 30 and 60 min. The handsheet were irradiated for 10, 20, 30 and 40 min for accelerated aging. The optical characteristics of the handsheets were measured before and after optical aging. The results showed that following bleaching and accetylation, absorption coefficient, K/S ratio, opacity, yellowness, greenness and post colour number were decreased and brightness was increased. Acetylated handsheets, especially those acetylated for 60 min, have better brightness stability and less brightness reversion.
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- I. Forsskahl, J. Pulp Paper Sci., 26, 245 (2000).
- E.K. Monica and L. Helena, Pulp Paper Res. J., 7, 108 (1992).
- M. Paullsson, A. Lucian and J. Arthur, J. Wood Chem. Technol., 21, 343 (2001).
- A.L. Andrady and N.D. Searle, Tappi J., 78, 131 (1995).
- A. Barzan and S. Soraki, Procedure for Experimental, Mazandaran Wood and Paper Industries, Sari, Iran, pp. 111-121.
- R. Vaysi and S.A. Mirshokraie, J. Sci. Tech. Nat. Resour., 2, 79 (2007).
- J. Mailly, J.F. Le Nest, J.M.S. Tosio and J. Silvy, Tappi J., 80, 176 (1997).
References
I. Forsskahl, J. Pulp Paper Sci., 26, 245 (2000).
E.K. Monica and L. Helena, Pulp Paper Res. J., 7, 108 (1992).
M. Paullsson, A. Lucian and J. Arthur, J. Wood Chem. Technol., 21, 343 (2001).
A.L. Andrady and N.D. Searle, Tappi J., 78, 131 (1995).
A. Barzan and S. Soraki, Procedure for Experimental, Mazandaran Wood and Paper Industries, Sari, Iran, pp. 111-121.
R. Vaysi and S.A. Mirshokraie, J. Sci. Tech. Nat. Resour., 2, 79 (2007).
J. Mailly, J.F. Le Nest, J.M.S. Tosio and J. Silvy, Tappi J., 80, 176 (1997).