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2 010 069

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IPC

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Application

5054079/12, 1992-07-08

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Actual filing date

1992-07-08

(45)

Published

1994-03-30

(72)

Inventor

Mutovina M.G.Bondareva T.A.Orekhov B.V.Samsonov N.E.Grankin Ju.V.Fadeev B.A.Najdina R.I.Kiselev S.S.Khejkinen L.N.Najdin V.N.Ivanov Ju.I.

(73)

Holder

Vyborgskij Tselljulozno-Bumazhnyj Kombinat

PROCESS FOR MANUFACTURING CHEMICAL PULP Russian patent published in 1994 - IPC

Abstract RU 2010069 C1

FIELD: pulp-making process. SUBSTANCE: process for manufacturing chemical pulp includes cooking of broad-leaved wood stock in sulfite liquor and washing of the resulting pulp. Mixture of raw tower sulfite liquor containing 1.45-1.65 % by weight of Na₂O and 4.2-4.0 % by weight of SO₂ in total and aqueous solution of sodium carbonate, 90-110 g/l, is used as the cooking liquor at their volume ratio of 100: 3 to 100: 5, respectively. The cooking process is carried out in the liquor containing 1.75 to 2.25 % of combined SO₂ and 1.65-2.10 % of Na₂O and having pH of 2.5-4.0, with total SO₂ of the cooking liquor being of 3.8-4.5 % . EFFECT: increased yield and improved quality of the end product. 1 cl, 1 tbl

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RU 2 010 069 C1

Authors

Mutovina M.G.

Bondareva T.A.

Orekhov B.V.

Samsonov N.E.

Grankin Ju.V.

Fadeev B.A.

Najdina R.I.

Kiselev S.S.

Khejkinen L.N.

Najdin V.N.

Ivanov Ju.I.

Dates

1994-03-30—Published

1992-07-08—Filed