| 摘要 |
The viscosity of paper pulp is maximized, while chlorine bleaching is minimized or eliminated, by subjecting the pulp suspension to multiple consecutive oxygen bleaching stages, with a countercurrent wash between O2 stages. A chelating agent-such as EDTA-may be added to the countercurrent wash liquid, and/or another chelating agent-such as DTPA-may be used to pretreat the pulp. |
