NO20045384L - Process for producing unbleached pulp with very low COD - Google Patents

Process for producing unbleached pulp with very low COD

Info

Publication number
NO20045384L
NO20045384L NO20045384A NO20045384A NO20045384L NO 20045384 L NO20045384 L NO 20045384L NO 20045384 A NO20045384 A NO 20045384A NO 20045384 A NO20045384 A NO 20045384A NO 20045384 L NO20045384 L NO 20045384L
Authority
NO
Norway
Prior art keywords
pulp
eod
unbleached pulp
low
low cod
Prior art date
Application number
NO20045384A
Other languages
Norwegian (no)
Inventor
Brian Wester
Michael D Vrbanac
Julie A Reimer
Peter K Lau
Brian E Dennis
David W Bickell
Original Assignee
Weyerhaeuser Co
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
Priority claimed from PCT/US2002/015522 external-priority patent/WO2003097930A1/en
Application filed by Weyerhaeuser Co filed Critical Weyerhaeuser Co
Publication of NO20045384L publication Critical patent/NO20045384L/en

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B16/00—Use of organic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of organic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B16/02—Cellulosic materials
    • 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
    • D21C9/02—Washing ; Displacing cooking or pulp-treating liquors contained in the pulp by fluids, e.g. wash water or other pulp-treating agents

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Paper (AREA)

Abstract

Et masseprodukt som har en lav eOD omfatter en ubleket masse som er gjermomfuktet og vasket i alkahsk vann i tilsfrekkehg tid til at eOD etter gjermomfulrting og vasldng er mindre erm eller lik 3,0 kg/1000 kg tørr masse. Massen er fremstilt ved gjentatt gjermomfiikting og vasking av en ubleket masse i alkalisk vann som aldri tillates å falle til under pH 7,0. Massen gjermomfiiktes og vaskes i totalt minst 400 minutter ved en forhøyet temperatur for å fremstille masseproduktet som har en lav eOD.A pulp product having a low eOD comprises an unbleached pulp which is yeast-moistened and washed in alkaline water for a sufficient period of time after the pulping and washing of the eOD is less sleeve or equal to 3.0 kg / 1000 kg of dry pulp. The pulp is prepared by repeated yeast wetting and washing of an unbleached pulp in alkaline water which is never allowed to fall below pH 7.0. The pulp is stirred and washed for a total of at least 400 minutes at an elevated temperature to prepare the pulp product having a low eOD.

NO20045384A 2002-05-15 2004-12-09 Process for producing unbleached pulp with very low COD NO20045384L (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2002/015522 WO2003097930A1 (en) 2002-05-15 2002-05-15 Process for producing very low cod unbleached pulp

Publications (1)

Publication Number Publication Date
NO20045384L true NO20045384L (en) 2004-12-09

Family

ID=33476215

Family Applications (1)

Application Number Title Priority Date Filing Date
NO20045384A NO20045384L (en) 2002-05-15 2004-12-09 Process for producing unbleached pulp with very low COD

Country Status (5)

Country Link
AU (1) AU2002309875B2 (en)
BR (1) BR0215714A (en)
CA (1) CA2482556C (en)
NO (1) NO20045384L (en)
SE (1) SE0402582L (en)

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3148106A (en) * 1964-01-29 1964-09-08 Rayonier Inc Pulp refining

Also Published As

Publication number Publication date
SE0402582D0 (en) 2004-10-26
CA2482556C (en) 2008-09-23
AU2002309875B2 (en) 2006-08-17
CA2482556A1 (en) 2003-11-27
AU2002309875A1 (en) 2003-12-02
SE0402582L (en) 2004-12-08
BR0215714A (en) 2005-02-22

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