Oxygen delignification of bamboo Kraft pulp

The paper investigates the factors of the oxygen delignification of sulfate bamboo pulp and the effect of the oxygen delignification on the ECF technological process. The results show that the influencing factors of the oxygen delignification include time, temperature, oxygen pressure, NaOH dosage, MgSO4 dosage and pulp concentration. When time was 60min, temperature 100℃, NaOH dosage 2.5%, oxygen pressure was 0.5MPa, pulp concentra- tion 10% and MgSO4 dosage 0.5%, the pulp viscosity reduced not too much and the removal rate of lignin was much higher. After the oxygen delignification, the Kappa number decreased from 22.7 to 12.1, the brightness increased from 23.6% ISO to 34.8% ISO, and the viscosity decreased from 1064 mL/g to 963.0 mL/g.