Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Continuous chemical treatment or continuous charging or...
Patent
1981-10-27
1984-02-14
Alvo, Steve
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Continuous chemical treatment or continuous charging or...
162 57, 162 65, 162243, D21C 302, D21C 900
Patent
active
044314809
ABSTRACT:
Good temperature and pH control as well as uniform mixing of pulp or other fibrous materials is achieved in a medium consistency oxygen delignification method and system. Alkaline chemicals are sprayed, optionally using oxygen gas as the atomizing agent, into the gas space above the level of pulp maintained in one or more substantially horizontal tubular reaction vessels. At least a part of the steam requirement of the reaction is added only after the major portion of alkaline chemicals has been added to the system. In other embodiments of the invention, alkaline chemicals may be injected into the substantially vertical conduit connecting two reaction vessels or two different alkaline chemicals may be injected at different points in the system.
REFERENCES:
patent: 3313677 (1967-04-01), Carr
patent: 3725194 (1973-04-01), Smith et al.
patent: 3769152 (1973-10-01), Samuelson et al.
patent: 4198266 (1980-04-01), Kirk et al.
patent: 4248662 (1981-02-01), Wallick
Janson et al., "The Use of Unconventional Alkali in Cooking and Bleaching", No. 2, 1978 p. 89, Puperi ja Puce.
"Low-Consistency Oxygen Delignification System Uses Continuous Pipeline Reactor", Paper Trade Journal, Jul. 15, 1978.
Spraying Systems Company, Industrial Catalog 27, pp. 46-62, 1978.
Magnotta Vincent L.
Markham Larry D.
Alvo Steve
The Black Clawson Company
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