A method for bleaching unbleached softwood or hardwood pulps using hydrogen peroxide without added alkali for activation is described. The aqueous hydrogen peroxide solution contains an alkaline earth metal carbonate, preferably magnesium carbonate and can be used at elevated temperatures. Bleached hardwood or softwood mechanical pulps with high brightness, low yellowness (b*) and reduced reversion properties are produced.
申请公布号
WO0017442(A1)
申请公布日期
2000.03.30
申请号
WO1999CA00239
申请日期
1999.03.22
申请人
QUEEN'S UNIVERSITY AT KINGSTON;WAN, JEFFREY, K.-S.;DEPEW, M., CATHERINE