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(19)

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2 283 909

(13)

(51)

IPC

D21C9/10(2006-01-01)

D21C9/14(2006-01-01)

D21C9/16(2006-01-01)

(21) (22)

Application

2004138899/12, 2004-12-30

(24)

Start date

2004-12-30

(22)

Actual filing date

2004-12-30

(45)

Published

2006-09-20

(72)

Inventor

Sergeev Aleksandr DmitrievichAt'Man Ol'Ga Petrovna

(73)

Holder

Otkrytoe Aktsionernoe Obshchestvo Nauchno-Issledovatel'Skij Institut Lesnoj, Tselljulozno-Bumazhnoj Promyshlennosti" Tsbp")

CELLULOSE BLEACHING PROCESS Russian patent published in 2006 - IPC D21C9/10 D21C9/14 D21C9/16

Abstract RU 2283909 C1

FIELD: pulp-and-paper industry.

SUBSTANCE: unbleached sulfate cellulose obtained from hardwood is subjected oxygen-alkali delignification, after which treated with chlorine dioxide in presence of oxyethylidenediphosphonic acid and then consecutively hydrogen peroxide and chlorine dioxide solutions. Process may be used in production of bleached fibrous intermediates.

EFFECT: increased whiteness and strength characteristics of cellulose and improved environmental safety of bleaching process.

2 cl, 1 tbl

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RU 2 283 909 C1

Authors

Sergeev Aleksandr Dmitrievich

At'Man Ol'Ga Petrovna

Dates

2006-09-20—Published

2004-12-30—Filed