Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Continuous chemical treatment or continuous charging or...
Patent
1975-05-06
1979-05-22
Bashore, S. Leon
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Continuous chemical treatment or continuous charging or...
162 30K, 162 33, 162 60, 162 62, 162 65, D21C 1104
Patent
active
041558065
ABSTRACT:
This invention relates to a process for multi-stage alkaline pulping of ligno-cellulosic raw materials and recovery of delignification spent liquors, i.e. black liquor from digestion with white liquor and oxy-liquor comprising bleach plant effluent extracted from alkaline oxygen delignification of brown stock.
According to the invention, oxy-liquor and intermediate black liquor in the digester are passed through that part of the material column to which the cellulosic raw material, e.g. wood chips, enters. There, hydroxide deriving from two sources, white liquor and oxy-liquor, is exhausted prior to its discharge as terminal black liquor. White liquor is consequently injected to the level of the pre-digested material in the column. This injection is controlled by continuous measurement, e.g. by automated titration analysis, of the hydroxide concentration in the joint volume of oxy-liquor and white liquor in the main cooking liquor circulation system.
By this means the concentration ratio
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patent: 3830688 (1974-08-01), Mannbro
patent: 3832276 (1974-08-01), Roymoullk et al.
Bashore S. Leon
Skogsagarnas Industri Aktiebolag
Smith William F.
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