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2 072 014

(13)

C1

(51)

IPC

(21) (22)

Application

93049739/12, 1993-10-29

(22)

Actual filing date

1993-10-29

(45)

Published

1997-01-20

(72)

Inventor

Lillemor Khol'Tinger[Se]Venke Khermansson[Se]Lennart Andersson[Se]Jiri Basta[Se]Magnus Linsten[Se]

(73)

Holder

Eka Nobel' Aktiebolag

METHOD FOR BLEACHING LIGNOCELLULOSE-CONTAINING WOOD PULP Russian patent published in 1997 - IPC

Abstract RU 2072014 C1

FIELD: pulp-and-paper industry. SUBSTANCE: bleaching process includes washing pulp with a washing liquid followed by bleaching with peroxide-containing compound. Prior to be washed, pulp is treated with a magnesium compound at pH within the range 1 to 7. When treating pulp, a calcium compound may also be added. pH value in this case may be higher than when treating pulp with magnesium compound. Bleaching is carried out in presence of calcium compound. EFFECT: enhanced efficiency of bleaching process. 10 cl, 6 tbl

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RU 2 072 014 C1

Authors

Lillemor Khol'Tinger[Se]

Venke Khermansson[Se]

Lennart Andersson[Se]

Jiri Basta[Se]

Magnus Linsten[Se]

Dates

1997-01-20—Published

1993-10-29—Filed

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