GB1452615A - Method of pulping wood with oxygen - Google Patents

Method of pulping wood with oxygen

Info

Publication number
GB1452615A
GB1452615A GB5002573A GB5002573A GB1452615A GB 1452615 A GB1452615 A GB 1452615A GB 5002573 A GB5002573 A GB 5002573A GB 5002573 A GB5002573 A GB 5002573A GB 1452615 A GB1452615 A GB 1452615A
Authority
GB
United Kingdom
Prior art keywords
liquid
oxygen
digestion
deactivation
withdrawn
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
GB5002573A
Inventor
H O Samuelson
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 GB1452615A publication Critical patent/GB1452615A/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
    • D21C11/00—Regeneration of pulp liquors or effluent waste waters
    • D21C11/04—Regeneration of pulp liquors or effluent waste waters of alkali lye
    • 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
    • D21C3/00—Pulping cellulose-containing materials
    • D21C3/02—Pulping cellulose-containing materials with inorganic bases or alkaline reacting compounds, e.g. sulfate processes
    • D21C3/026—Pulping cellulose-containing materials with inorganic bases or alkaline reacting compounds, e.g. sulfate processes in presence of O2, e.g. air

Landscapes

  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Paper (AREA)

Abstract

1452615 Pulping wood with oxygen MO OCH DOMSJO AB 26 Oct 1973 [27 Oct 1972] 50025/73 Heading D2W In a method of pulping wood with a digestion liquid of pH 7-9 in the presence of oxygen, at least some of the digestion liquid is removed from the digester during and/or after digestion, treated so as to deactivate materials present in the liquid which tends to degrade carbohydrates during digestion and the deactivated liquid is returned for use in the same or another oxygen digestion method. The digestion liquid may comprise an alkali e.g. sodium hydroxide, carbonate, and/or bicarbonate. The deactivation treatment may comprise treatment with an oxidising agent e.g. air and/or oxygen and/or a peroxide and/ or heating to a temperature above that at which the liquid was withdrawn from the digester. Catalysts may be used to speed up the rate of deactivation. Deactivation may also be effected more quickly by irradiating the withdrawn liquid whilst deactivating the latter by treatment with an oxidising agent and/or heating at an elevated temperature. An alkali metal or alkaline earth metal hydroxide or carbonate may be added to the withdrawn liquid before and/or during deactivation. The wood may be pretreated with an alkali prior to oxygen pulping.
GB5002573A 1972-10-27 1973-10-26 Method of pulping wood with oxygen Expired GB1452615A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE7213937A SE377142B (en) 1972-10-27 1972-10-27

Publications (1)

Publication Number Publication Date
GB1452615A true GB1452615A (en) 1976-10-13

Family

ID=20298266

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5002573A Expired GB1452615A (en) 1972-10-27 1973-10-26 Method of pulping wood with oxygen

Country Status (12)

Country Link
JP (1) JPS5120603B2 (en)
AT (1) AT330569B (en)
BR (1) BR7308391D0 (en)
CA (1) CA982378A (en)
CH (1) CH587961A5 (en)
DE (1) DE2352857B2 (en)
FI (1) FI55062C (en)
FR (1) FR2204736B1 (en)
GB (1) GB1452615A (en)
IT (1) IT999682B (en)
SE (1) SE377142B (en)
ZA (1) ZA737950B (en)

Also Published As

Publication number Publication date
DE2352857A1 (en) 1974-05-16
IT999682B (en) 1976-03-10
FR2204736B1 (en) 1976-05-07
CA982378A (en) 1976-01-27
JPS5120603B2 (en) 1976-06-26
FR2204736A1 (en) 1974-05-24
FI55062B (en) 1979-01-31
ATA908473A (en) 1975-09-15
ZA737950B (en) 1974-08-28
AT330569B (en) 1976-07-12
SE377142B (en) 1975-06-23
DE2352857B2 (en) 1976-04-29
CH587961A5 (en) 1977-05-31
JPS4975803A (en) 1974-07-22
BR7308391D0 (en) 1974-09-05
FI55062C (en) 1979-05-10

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Legal Events

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