Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Gas – vapor or mist contact
Patent
1984-10-01
1986-11-11
Alvo, Steve
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Gas, vapor or mist contact
162 79, D21C 9147
Patent
active
046221018
ABSTRACT:
Delignifying bleaching of lignocellulosic materials, particularly wood pulps already partly delignified by conventional alkaline pulping processes by electrochemically generated ferricyanide in the presence of an effective amount of molecular oxygen is disclosed.
Attainment of low kappa numbers employing milder temperature and pressure conditions than are employed in conventional oxygen bleaching is made possible and the process may be substituted for at least a portion of the conventional chlorine based bleaching processes which are current industry standard practice for bleaching kraft pulps.
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"A Study of Some of the Variables in Bleaching Pulp in an Electrolytic Cell" by David R. Gustafson in TAPPI, 42, pp. 612 to 616, (1959).
"Chlorine-Free Ways of Electrochemical Bleaching of Pulp", E. I. Chupka, et al. Bumazhnaya Promyshlennost (Paper Industry, USSR), N11, 20-21, 1978.
"Electrochemical Way of Bleaching of Kraft Pulp", S. R. Stromsky, E. I. Chupka, Wood Chemistry, USSR, 1978, N4,11-14.
Landucci, "Influence of Transition Metals in Oxygen Pulping", TAPPI, vol. 58, No. 1, Feb. 1975, p. 60.
McCloskey et al, "Catalytic Influence of Iron and Magnesium Ions in Oxygen Bleaching Reactions", TAPPI, vol. 58, No. 2, Feb. 1975, p. 56.
Hull Michael N.
Yasnovsky Vacheslav M.
Alvo Steve
International Paper Company
Zielinski Walt Thomas
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