GB1392979A - Process for the prepartion of cellulose pulp - Google Patents

Process for the prepartion of cellulose pulp

Info

Publication number
GB1392979A
GB1392979A GB5757472A GB5757472A GB1392979A GB 1392979 A GB1392979 A GB 1392979A GB 5757472 A GB5757472 A GB 5757472A GB 5757472 A GB5757472 A GB 5757472A GB 1392979 A GB1392979 A GB 1392979A
Authority
GB
United Kingdom
Prior art keywords
acid
magnesium
bleaching
peroxide
liquor
Prior art date
Legal status (The legal status 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 status listed.)
Expired
Application number
GB5757472A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mo och Domsjo AB
Original Assignee
Mo och Domsjo AB
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 Mo och Domsjo AB filed Critical Mo och Domsjo AB
Publication of GB1392979A publication Critical patent/GB1392979A/en
Expired legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
    • D21B1/14—Disintegrating in mills
    • D21B1/16—Disintegrating in mills in the presence of chemical agents

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)

Abstract

1392979 Bleaching pulp MO OCH DOMSJO AB 13 Dec 1972 [14 Dec 1971] 57574/72 Heading D1P Bleached pulp is formed by mechanically liberating wood fibres in a grinding region, bleaching the pulp obtained with a peroxide as the sole bleaching agent, the mechanical liberation of the fibres being carried out in the presence of spent liquor of pH greater than 7.0 from the peroxide bleaching stage. The bleaching agent may be hydrogen peroxide, sodium peroxide or paracetic acid. The spent water may contain complex formers such as ethylenediamine - tetraacetic acid, nitrilotriacetic acid, diethylenetriamine penteracetic acid, ethylenediamine triacetic acid, tetraethylenepenteramine heptaacetic acid, hydroxethylenediamine triacetic acid and alkali metal salts thereof, iminodiacetic acid, 2- hydroxyethylimino diacetic acid, cyclohexanediamine tetraacetic acid, anthranil-N, N-diacetic acid, 2-picolylamine-N, N-diacfftic acid, RCHOHCOOH or RCHOHCH 2 COOH where R is H or C1-9 alkyl, e.g. glycolic acid, lactic acid, 1, 2 hydroxypropionic acid, dihydroxybutyric acid, hydroxy-n-valeric acid, sugar acids, aldonic acids such as gluconic acid, galactonic acid, mannonic acid and saccharinic acid. The liquor may also contain magnesium oxide, magnesium hydroxide, magnesium carbonate, magnesium chloride, magnesium nitrate, magnesium acetate, magnesium sulphate or magnesium complexes of the above complex formers sodium hydroxide or sodium silicate. As shown, wood is ground 1, passed to pressure screens and centricleaners 2, screened 3, dewatered 4, pumped 5, bleached 6 passed to cap-forming machine 7 and dried at 8. Bleaching liquor is returned to the grinding stage via line 17. Reject screenings can be refined 9, screened 10 and recycled.
GB5757472A 1971-12-14 1972-12-13 Process for the prepartion of cellulose pulp Expired GB1392979A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE1597371A SE363650B (en) 1971-12-14 1971-12-14

Publications (1)

Publication Number Publication Date
GB1392979A true GB1392979A (en) 1975-05-07

Family

ID=20301521

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5757472A Expired GB1392979A (en) 1971-12-14 1972-12-13 Process for the prepartion of cellulose pulp

Country Status (12)

Country Link
AT (1) AT323548B (en)
BE (1) BE792031A (en)
CA (1) CA973662A (en)
CH (1) CH560288A5 (en)
DE (1) DE2261049C3 (en)
FI (1) FI54342C (en)
FR (1) FR2165529A5 (en)
GB (1) GB1392979A (en)
IT (1) IT976017B (en)
NL (1) NL154286B (en)
NO (1) NO131847C (en)
SE (1) SE363650B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2178769A (en) * 1985-08-05 1987-02-18 Kao Corp Bleaching improving composition
CN110257453A (en) * 2019-05-28 2019-09-20 中国林业科学研究院林产化学工业研究所 A kind of preprocess method for improving fibrous raw material biological enzymolysis conversion ratio and preparing fermentable sugars

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE413684C (en) * 1974-09-23 1987-05-07 Mo Och Domsjoe Ab PROCEDURE FOR PREPARING CELLULOSAMASSA IN THE REPLACEMENT AREA 65-95%
SE387977B (en) * 1975-01-27 1976-09-20 Elektrokemiska Ab WAY TO PRODUCE BLEACH, MECHANICAL PULP WITH HIGH STRENGTH AND BRIGHTNESS
NO760666L (en) * 1976-02-27 1977-08-30 Papirind Forskningsinst PROCEDURE FOR MAKING MECHANICAL MASSES.
SE420329C (en) * 1978-02-16 1984-07-10 Mo Och Domsjoe Ab PROCEDURE FOR THE PREPARATION OF GRINDING PAPER
SE433954B (en) * 1980-03-25 1984-06-25 Mo Och Domsjoe Ab PROCEDURES AND DEVICES FOR REDUCING THE PREPARATION OF GRINDING MACHINES FROM WOODWOODS IN STONE GRINDING GROUPS REMOVE AND SPETOR YEAR REGULATION OF THE FREENESS OF THE MASS

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR925243A (en) * 1945-04-05 1947-08-28 St Regis Paper Co Improvements to bleached ground wood pulp and its manufacturing processes
US3023140A (en) * 1958-11-24 1962-02-27 Bauer Bros Co Pulp bleaching

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2178769A (en) * 1985-08-05 1987-02-18 Kao Corp Bleaching improving composition
CN110257453A (en) * 2019-05-28 2019-09-20 中国林业科学研究院林产化学工业研究所 A kind of preprocess method for improving fibrous raw material biological enzymolysis conversion ratio and preparing fermentable sugars

Also Published As

Publication number Publication date
NO131847C (en) 1975-08-13
NO131847B (en) 1975-05-05
DE2261049C3 (en) 1986-02-13
DE2261049B2 (en) 1978-04-06
FR2165529A5 (en) 1973-08-03
CH560288A5 (en) 1975-03-27
NL7216935A (en) 1973-06-18
DE2261049A1 (en) 1973-06-20
BE792031A (en) 1973-03-16
IT976017B (en) 1974-08-20
SE363650B (en) 1974-01-28
FI54342B (en) 1978-07-31
NL154286B (en) 1977-08-15
FI54342C (en) 1978-11-10
CA973662A (en) 1975-09-02
AT323548B (en) 1975-07-10

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Legal Events

Date Code Title Description
PS Patent sealed
PE20 Patent expired after termination of 20 years

Effective date: 19921212