A new environmentally friendly pulping and bleaching technology for poplar wood


Kirci H. , Usta M. , Gumuskaya E.

CELLULOSE CHEMISTRY AND TECHNOLOGY, cilt.37, ss.273-282, 2003 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 37
  • Basım Tarihi: 2003
  • Dergi Adı: CELLULOSE CHEMISTRY AND TECHNOLOGY
  • Sayfa Sayıları: ss.273-282

Özet

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.