Madhu R Ahluwalia

US Patent:

50322249, Jul 16, 1991

Filed:

Mar 27, 1989

Appl. No.:

7/328678

Inventors:

Madhu R. Ahluwalia - Mundelein IL

Assignee:

Exxon Chemical Patent Inc. - Linden NJ

International Classification:

D21C 320

US Classification:

162 75

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/nonionic 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.