108.
(11) Patent number: 2150538
(46) Date of publication: 10.06.2000
(51) Int. Cl.7: D 21 C 3/04, 3/20
(21) Application number: 99119129/12
(22) Application date: 03.09.1999
(71) Applicant:
Institut khimii i khimicheskoj tekhnologii SO RAN
(72) Inventor:
Danilov V.G.,
Kuznetsova S.A.,
Kuznetsov B.N.
(73) Proprietor:
Institut khimii i khimicheskoj tekhnologii SO RAN
(98) Mail address:
660049, g.Krasnojarsk, ul. K. Marksa 42, IKhKhT SO RA
(54) METHOD OF PREPARING CELLULOSE INTERMEDIATE
(57)
FIELD: paper-and-pulp industry. SUBSTANCE: cooking liquor containing 37% hydrogen peroxide and acetic acid at molar ratio 90.3-0.5):1 and sulfuric acid catalyst in quantity 1.5 to 2.5% of the weight of absolutely dry wood. Cooking is carried out for 2 to 5 h at water duty 10:1 and temperature 120-140 C. EFFECT: improved quality of intermediate due to higher content of cellulose, reduced consumption of reagents, and improved environmental condition. 3 tbl, 21 ex
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