RU94029196A - Method of bleaching sulfate cellulose - Google Patents

Method of bleaching sulfate cellulose

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Publication number
RU94029196A
RU94029196A RU94029196/12A RU94029196A RU94029196A RU 94029196 A RU94029196 A RU 94029196A RU 94029196/12 A RU94029196/12 A RU 94029196/12A RU 94029196 A RU94029196 A RU 94029196A RU 94029196 A RU94029196 A RU 94029196A
Authority
RU
Russia
Prior art keywords
cellulose
pulp
chlorine dioxide
stage
hydrogen peroxide
Prior art date
Application number
RU94029196/12A
Other languages
Russian (ru)
Other versions
RU2075566C1 (en
Inventor
В.А. Демин
Е.В. Герман
Л.А. Никулина
Н.Ф. Пестова
Э.И. Федорова
Т.П. Щербакова
Original Assignee
Коми научный центр Уральского отделения РАН
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Коми научный центр Уральского отделения РАН filed Critical Коми научный центр Уральского отделения РАН
Priority to RU94029196A priority Critical patent/RU2075566C1/en
Publication of RU94029196A publication Critical patent/RU94029196A/en
Application granted granted Critical
Publication of RU2075566C1 publication Critical patent/RU2075566C1/en

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Abstract

FIELD: cellulose and paper production. SUBSTANCE: in order to provide more selective and efficient two-step bleaching of sulfate cellulose to 80-85.9% whiteness with less cellulose fiber destruction and greater output, cellulose is treated in series with chlorine dioxide and hydrogen peroxide. First step is conducted at 50-100 C with specific chlorine dioxide input 0.07-0.12% per Kapp unit until reagent is completely absorbed by 2-10% cellulose pulp (30-120 min). The second step is conducted for 1-4 h at 70-100 C in presence of stabilizer with hydrogen peroxide input 0.5-3.0% based on weight of absolutely dry cellulose, pH of pulp being 9.5-10.5 and pulp concentration 10-20%. EFFECT: enhanced efficiency of process.

Claims (1)

Изобретение относится к области целлюлозно-бумажного производства. Технический результат состоит в разработке более избирательного и эффективного способа отбелки сульфатной целлюлозы в две ступени до 80-85,9% белизны при меньшей деструкции целлюлозного волокна и большем выходе. Сущность изобретения состоит в том, что сульфатную целлюлозу последовательно обрабатывают диоксидом хлора на первой ступени и пероксидом водорода на второй ступени. Обработку целлюлозы на первой ступени проводят при удельном расходе 0,07-0,12% СlO2 на единицу Каппа, при температуре 50-100°С до полного поглощения диоксида хлора целлюлозной массой, а на второй ступени проводят обработку целлюлозы при pH 10±0,5 в присутствии стабилизатора. Обработку диоксидом хлора ведут при концентрации массы 2-10% в течение 30-120 мин. Обработку пероксидом водорода проводят при расходе 0,6-3,0% H2O2 от массы абсолютно сухой целлюлозы, при концентрации массы 10-20%, температуре 70-100°С, в течение 1-4 ч.The invention relates to the field of pulp and paper production. The technical result consists in the development of a more selective and effective method of bleaching sulphate pulp in two steps up to 80-85.9% whiteness with less degradation of the cellulose fiber and a higher yield. The essence of the invention lies in the fact that sulphate pulp is sequentially treated with chlorine dioxide in the first stage and hydrogen peroxide in the second stage. Cellulose treatment in the first stage is carried out at a specific flow rate of 0.07-0.12% ClO 2 per Kappa unit, at a temperature of 50-100 ° C until the chlorine dioxide is completely absorbed by the pulp, and in the second stage, cellulose is treated at pH 10 ± 0 , 5 in the presence of a stabilizer. Treatment with chlorine dioxide is carried out at a mass concentration of 2-10% for 30-120 minutes Treatment with hydrogen peroxide is carried out at a flow rate of 0.6-3.0% H 2 O 2 by weight of absolutely dry cellulose, at a mass concentration of 10-20%, a temperature of 70-100 ° C, for 1-4 hours
RU94029196A 1994-08-04 1994-08-04 Method of whitening sulfate cellulose RU2075566C1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
RU94029196A RU2075566C1 (en) 1994-08-04 1994-08-04 Method of whitening sulfate cellulose

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
RU94029196A RU2075566C1 (en) 1994-08-04 1994-08-04 Method of whitening sulfate cellulose

Publications (2)

Publication Number Publication Date
RU94029196A true RU94029196A (en) 1996-08-20
RU2075566C1 RU2075566C1 (en) 1997-03-20

Family

ID=20159388

Family Applications (1)

Application Number Title Priority Date Filing Date
RU94029196A RU2075566C1 (en) 1994-08-04 1994-08-04 Method of whitening sulfate cellulose

Country Status (1)

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RU (1) RU2075566C1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116770626A (en) * 2023-05-27 2023-09-19 山东科迈生物制浆有限公司 Grass fiber primary pulp with low water retention value and preparation method thereof

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7976677B2 (en) * 2006-12-18 2011-07-12 International Paper Company Process of bleaching hardwood pulps in a D1 or D2 stage in a presence of a weak base

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116770626A (en) * 2023-05-27 2023-09-19 山东科迈生物制浆有限公司 Grass fiber primary pulp with low water retention value and preparation method thereof
CN116770626B (en) * 2023-05-27 2024-02-09 山东科迈生物制浆有限公司 Grass fiber primary pulp with low water retention value and preparation method thereof

Also Published As

Publication number Publication date
RU2075566C1 (en) 1997-03-20

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