What Are the Different Methods of Delignification?
DTPA pretreatment before high-yield poplar NS-AQ chemical pulp delignification-the results show that DTPA pretreatment has certain effects on pulp properties. In the range of pH value 1, as the pH value increases, the whiteness of the pulp decreases. The suitable conditions for DTPA pretreatment are: pH: 3, time: 30 min, temperature: 40 ~ C, pulp consistency: 15%, dosage: 2.5%. The pretreatment makes the oxygen delignification reaction selective, the Kappa number decreases by 12%, the viscosity increases by 4.7%, and the whiteness increases by 5.4%.