Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Waste paper or textile waste
Patent
1993-03-02
1994-06-28
Hastings, Karen M.
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Waste paper or textile waste
162 7, 162 8, D21C 502, D21C 916
Patent
active
053243900
ABSTRACT:
Color is removed from secondary pulps with non-chlorine based bleaching agents in treating sequences using oxygen with combinations of peroxide, ozone, and/or hydrosulfite at/controlled pH conditions. Acid treatment prior to bleaching steps improves color removal and protects fibers from damage at more severe bleaching conditions.
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patent: 5011572 (1991-04-01), Parthasarathy et al.
Angulo, J. E.; "Environmentally Safe Bleaching of Post Consumer Waste Papers"; Tappi Pulping Conf. 1990; Oct. 14-17; Toronto, Ontario, Canada.
Ruvo, et al.; "Upgrading a Pulp from Corrugated Containers by Oxygen Delignification"; Tappi Journal, Jun. 1986.
Berger, et al.; "Advanced Bleaching Technology for Secondary Fibers", 1990.
Matzko, et al.; "Various Approaches for Understanding and Improving Secondary Fiber Brightness"; Tappi Press, 1990.
Liebergott, N.; "Bleaching with Reductive Agents"; North Carolina Chlorine free Bleaching Workshop, Mar. 18-20, 1991.
Joachimides, T. et al.; "Bleaching Deinked Pulps"; 1990 Pueping Conference.
Mackhamm, et al.; "Oxygen Bleaching of Secondary Fiber Grades"; Tappi Journal; Dec. 1988.
Hristofas Konstantinos
Magnotta Vincent L.
Naddeo Ronald C.
Air Products and Chemicals Inc.
Fernbacher John M.
Hastings Karen M.
Marsh William F.
Simmons James C.
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