Soda-aq pu;ping and chlorine free bleaching of lloblolly pine-total system approach to sulfur free pulping and chlorine pree bleaching of softwood

摘要

Pre-oxidation with alkaline hydrogen peroxide has facilitated the soda-AQ pulping of loblolly pine chips to Kappa number 60.0 with less effective alkali (EA) and H-Factor. By using the chip penetrant Drew KPA300~( direct R ), additional reduction in the application of EA and H-Factor was realized. Three stages of sequential pre-oxidation were carried out by applying 6