Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Treatment with particular chemical
Patent
1989-03-27
1991-07-16
Simmons, David A.
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Treatment with particular chemical
162 72, 162 76, 162 82, D21C 320
Patent
active
050322249
ABSTRACT:
Alkaline pulping (such as Kraft) processes for various lignocellulosic materials, such as coniferous or disiduous wood chips, into pulp is improved by adding relatively small amounts of a digestive additive selected from the group consisting essentially of anionic surfactants, nonionic surfactants, and anionic
onionic surfactant blends, such as sodium alpha-sulfo methyl laurate, cocodiethanolamide, butyl ethylenoxide-propylenoxide block copolymers, etc. to the alkaline cooking media to obtain pulps having a select Kappa number range with a reduction in pulp material reject percentage, a reduction of H-factor, a reduction of white liquor requirements and a reduction of cooking time period, relative to H-factor, reject percentages, white liquor requirements and digestion periods experienced in similar alkaline digestion processes without the inventive digestive additive.
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Dang Thi
Exxon Chemical Patent Inc.
Simmons David A.
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