| Abstract:To investigate environmentally-friendly total-chlorine-free (TCF) short sequence bleaching of organic acid corn stalk rind pulp, E(PO) bleaching and E(PO)P bleaching were studied. The results indicated that alkaline extraction(E) was a process with a good selectivity of delignification, and was beneficial to subsequent bleaching processes. When NaOH dosage was 4.0% in E stage, the pulp yield, delignification rate, pulp viscosity and brightness were 95.4%, 23.5%, 115 mPa·s and 44.2%, respectively. For short sequence E(PO) alkaline extraction and pressurized hydrogen peroxide bleaching, bleached pulp with 87.6% yield, 53.5 mPa·s viscosity and 79.9% brightness could be obtained while NaOH dosage of E stage was 4.0% and H2O2 dosage of (PO) stage was 2.0%; the E(PO) bleached pulp showed good beating and papermaking performances, and could be used for medium-to-high grade fine papers. The E(PO)P bleaching sequence, when the total H2O2 dosage was 2.5%, could lead to 86.4% of pulp yield, 59.6 mPa·s of pulp viscosity, and 82.7% of pulp brightness; the E(PO)P bleached pulp could be used for high grade fine paper. |
