Open Access Open Access  Restricted Access Subscription or Fee Access

Review on Increasing the Kappa Reduction in Oxygen Delignification Stage at Pulp Mills

Brighten Balakrishnan, K. Kajesh, U. Ramya

Abstract


The use of oxygen delignification in bleached kraft pulp mills to reduce the lignin content of pulp prior to final bleaching is increasing worldwide.  However, oxygen treatments are normally limited to less than 50% lignin removal to avoid excessive loss of pulp strength potential.  More selective oxygen delignification processes are required which can extend lignin removal beyond 50% while maintaining final pulp quality.  Work reported here has shown that pulp treatment with small amounts of peroxymonosulfuric acid between two oxygen delignification stages improves overall selectivity.  This Non-chlorine Psa sequence achieved greater than 70% delignification

Keywords: Pulp, Lignin, Treatment, Delignification, Non-chlorine, Strength.

 


Keywords


Pulp, Lignin, Treatment, Delignification, Non-chlorine, Strength.

Full Text:

PDF

References


Springer E.L., McSweeny, J.D. 1988. Method for producing salts of monop-eroxysulfuric acid and simultaneously bleaching pulp, United States Patent, US 4,756,800 A.

Allison, R.W., McGrouther, K.G. 1995. Improved oxygen delignification with interstage peroxymonosulfuric acid treatment. Tappi J 78: 134–142

Jafari V., Sixta H., van Heiningen A. 2014. Multistage oxygen delignification of high kappa pine kraft pulp with per-oxymonosulfuric acid (Px). Holzforschung 68: 497–504.

Abou-Yousef H., El-Sakhawy M., Kamel S. 2003. Multi-stage bagasse pulping by using alkali/caro’s acid treatment, Industrial Crops and Products J, 21: 337-341.

Petit-Breuilh X., Zaror C., Melo R. 2004. Hexenuronic acid removal from unbleached kraft eucalyptus pulp by peroxymonosulfuric acid. J Chil Chem Soc 49: 355–360.

Kuwabara E., Koshitsuka T., Kajiyama M., Ohi H. 2011. Impact of filtrate from bleached pulp treated with peroxymo-nosulfuric acid for effective removal of hexenuronic acid, Jpn TAPPI J., 65 (10): 97-101.

Yoshida K., Koshitsuka T. 2008. On-site production of peroxymonosulfuric acid for hexenuronic acid removal from kraft pulp. Int. Pulp Bleach. Conf. 2008. PAPTAC, Quebec, 165–168

Tomoda I., Uchida Y. 2008. Peroxymo-nosulfuric acid bleaching-The brief of bleaching reaction and the result of mill trials-. Int. Pulp Bleach. Conf. 2008. PAPTAC, Quebec, 177–180.




DOI: https://doi.org/10.37591/jocc.v6i3.3532

Refbacks

  • There are currently no refbacks.