Bleaching of deinked paper/wood pulp
作者： Michel Devic , Lucien Bourson
DOI:
关键词: Inorganic chemistry 、 Hydrogen peroxide 、 Sodium dithionite 、 Aqueous solution 、 Thiourea dioxide 、 Pulp (paper) 、 Chemistry 、 Sulfite 、 Reducing agent 、 Sodium borohydride
摘要: Deinked paper/wood pulps are improvedly bleached to high levels of whiteness by conjointly treating such with a sulfite bleaching agent, e.g., Na2 SO3, NaHSO3 or mixture thereof, SO2 and NaOH, reducing agent more electronegative than the ion, thiourea dioxide, sodium borohydride dithionite, in reaction medium having an initial pH ranging from 6 12, advantageously followed washing values pulp then washed hydrogen peroxide aqueous alkaline medium.
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