GB1519072A - Oxygen bleaching of pulp in the presence of high-silica protector - Google Patents

Oxygen bleaching of pulp in the presence of high-silica protector

Info

Publication number
GB1519072A
GB1519072A GB784/76A GB78476A GB1519072A GB 1519072 A GB1519072 A GB 1519072A GB 784/76 A GB784/76 A GB 784/76A GB 78476 A GB78476 A GB 78476A GB 1519072 A GB1519072 A GB 1519072A
Authority
GB
United Kingdom
Prior art keywords
silicate
pulp
silica
bleached
bleaching
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
GB784/76A
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.)
Potlatch Corp
Original Assignee
Potlatch Corp
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 Potlatch Corp filed Critical Potlatch Corp
Publication of GB1519072A publication Critical patent/GB1519072A/en
Expired legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/10—Bleaching ; Apparatus therefor
    • D21C9/1026—Other features in bleaching processes
    • D21C9/1036—Use of compounds accelerating or improving the efficiency of the processes

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)

Abstract

1519072 Oxygen bleaching silicate protected wood pulp POTLATCH CORP 9 Jan 1976 [18 Feb 1975] 00784/76 Heading D1P Cellulosic pulp is bleached by oxygen gas at elevated temperature and pressure in the presence of alkali and a cellulose protection comprising an alkali metal colloidal silicate having a molar ratio of silica to alkali metal oxide of at least 1.6 to 1. Preferably the silicate is sodium silicate and may be a water glass having a silica: sodium oxide molar ratio of 2:1 to 4:1 or a surface hydroxylated silica sol with a ratio of up to 100:1. Potassium silicate is also specified. The semi bleached product may be subject to one or more additional bleaching steps using chlorine, chlorine dioxide hypochlorite or peroxide. Preferably 0.1 to 0.4% by weight of the silicate, calculated as SiO 2 , is applied to a sulphate (kraft) soda or sulphite pulp of hard or soft wood. and consistency 8 to 30% by weight. Spent liquor may be recycled to reduce the amount of silicate to be added. The pulp is oxygen bleached for 10 to 80 minutes at 95 to 135‹C and 70 to 225 p.s.i. The pH at the end of this bleaching is 9 to 11. Brightness, viscosity deligrification and yield of the pulp are reported.
GB784/76A 1975-02-18 1976-01-09 Oxygen bleaching of pulp in the presence of high-silica protector Expired GB1519072A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US55027475A 1975-02-18 1975-02-18

Publications (1)

Publication Number Publication Date
GB1519072A true GB1519072A (en) 1978-07-26

Family

ID=24196466

Family Applications (1)

Application Number Title Priority Date Filing Date
GB784/76A Expired GB1519072A (en) 1975-02-18 1976-01-09 Oxygen bleaching of pulp in the presence of high-silica protector

Country Status (7)

Country Link
JP (1) JPS5220562B2 (en)
CA (1) CA1062858A (en)
DE (1) DE2552931A1 (en)
FR (1) FR2301632A1 (en)
GB (1) GB1519072A (en)
SE (1) SE7600243L (en)
ZA (1) ZA76274B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009015704A1 (en) * 2007-07-31 2009-02-05 Voith Patent Gmbh Bleached fibrous material
SE1951006A1 (en) * 2019-09-04 2021-03-05 Stora Enso Oyj Fluff pulp from oxygen delignified pulp

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009015704A1 (en) * 2007-07-31 2009-02-05 Voith Patent Gmbh Bleached fibrous material
SE1951006A1 (en) * 2019-09-04 2021-03-05 Stora Enso Oyj Fluff pulp from oxygen delignified pulp
WO2021044321A1 (en) * 2019-09-04 2021-03-11 Stora Enso Oyj Fluff pulp
SE543640C2 (en) * 2019-09-04 2021-05-11 Stora Enso Oyj Fluff pulp from oxygen delignified pulp

Also Published As

Publication number Publication date
FR2301632A1 (en) 1976-09-17
ZA76274B (en) 1976-12-29
JPS5196505A (en) 1976-08-24
JPS5220562B2 (en) 1977-06-04
FR2301632B1 (en) 1980-06-20
CA1062858A (en) 1979-09-25
DE2552931A1 (en) 1976-09-02
SE7600243L (en) 1976-08-19

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee