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2 306 373

(13)

(51)

IPC

D21C3/10(2006-01-01)

D21C11/02(2006-01-01)

(21) (22)

Application

2005140068/12, 2005-12-22

(24)

Start date

2005-12-22

(22)

Actual filing date

2005-12-22

(45)

Published

2007-09-20

(72)

Inventor

Kirsanov Vladimir Anatol'EvichTjurin Evgenij TimofeevichMutovina Milja Grigor'EvnaBondareva Tamara Aleksandrovna

(73)

Holder

Otkrytoe Aktsionernoe Obshchestvo Nauchno-Issledovatel'Skij Institut Bumagi"

METHOD OF PREPARING BISULFITE COOKING LIQUOR ON MAGNESIUM BASE FOR PRODUCTION OF CELLULOSE Russian patent published in 2007 - IPC D21C3/10 D21C11/02

Abstract RU 2306373 C1

FIELD: pulp-and-paper industry.

SUBSTANCE: part of solution with pH 3.0-5.0 is brought into contact with sulfur dioxide until acidic (pH 1.5-3.5) bisulfite solution is obtained. Solution is then subjected to interaction with lump brucite fraction 10-150 mm until pH 3.0-5.0 and percentage of bound sulfur dioxide 47-55% are attained.

EFFECT: increased workability of process due to reduced equipment dimensions because only a small apparatus is required, which can be loaded with brucite at any time periodically or continuously.

1 tbl, 2 ex

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RU 2 306 373 C1

Authors

Kirsanov Vladimir Anatol'Evich

Tjurin Evgenij Timofeevich

Mutovina Milja Grigor'Evna

Bondareva Tamara Aleksandrovna

Dates

2007-09-20—Published

2005-12-22—Filed