A new environmentally friendly pulping and bleaching technology for poplar wood


Kirci H. , Usta M. , Gumuskaya E.

CELLULOSE CHEMISTRY AND TECHNOLOGY, vol.37, pp.273-282, 2003 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 37
  • Publication Date: 2003
  • Title of Journal : CELLULOSE CHEMISTRY AND TECHNOLOGY
  • Page Numbers: pp.273-282

Abstract

Oxygen-delignified ethanol-water (EW) pulp was bleached with two totally chlorine-free (TCF) bleaching sequences. Although the Pa(EP)PaP bleaching sequence assured a milder lignin extraction capability, the pulp brightness level reached was nearby that of the CEDED sequence. As a second TCF alternative, the (EOP)PPP sequence showed insufficient delignification and brightening ability on oxygen-delignified poplar EW pulp. Consequently, it was concluded that EW organosolv pulp could be bleached with the sequences containing peroxyacetic acid (PAA) and peroxide up to the desired brightness level. Yet, full-scale application of the Pa(EP)PaP sequence depends on the lower price of peroxide and PAA, and also on their widespread commercial usage.