Kraft cooking method using polysulfide cooking liquor

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United States of America Patent

PATENT NO 9580864
APP PUB NO 20170022663A1
SERIAL NO

15283711

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Abstract

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The method is for the preparation of kraft pulp with increased pulping yield from lignin-containing cellulosic material using polysulfide cooking liquor. In order to increase carbohydrate stabilization and hence the yield from a kraft cooking process a first impregnation stage using polysulfide cooking liquor is implemented at high alkali and polysulfide concentration and at a low temperature. Knots are added to a high-pressure conduit extending between an impregnation vessel and a digester.

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Patent Owner(s)

Patent OwnerAddress
VALMET AB851 94 SUNDSVALL

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Lindstrom, Mikael Lidingö, SE 26 106
Wilgotson, Fredrik Sundsvall, SE 5 3

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