Pongsatorn Chaivichit, Panitnad Chandranupap and Pravitra Chandranupap

pp. 867 - 873

Abstract

Various process parameters affecting eucalyptus kraft pulp delignification with peroxyacetic acid
were investigated. The results showed that pH was an important factor. The delignification rate increased
with increasing pH to the value of 6. High delignification rate was obtained when the pulp was chelated with
Na4
-EDTA prior to the peroxyacetic acid stage. Therefore, delignification reaction rate depends on peroxyacid charge, temperature, pH and metal content of pulp.

Keywords

• kraft pulp
• eucalyptus
• peroxyacetic acid
• chlorine free bleaching