SE0402582L - Process for producing unbleached pulp with very low COD - Google Patents

Process for producing unbleached pulp with very low COD

Info

Publication number
SE0402582L
SE0402582L SE0402582A SE0402582A SE0402582L SE 0402582 L SE0402582 L SE 0402582L SE 0402582 A SE0402582 A SE 0402582A SE 0402582 A SE0402582 A SE 0402582A SE 0402582 L SE0402582 L SE 0402582L
Authority
SE
Sweden
Prior art keywords
pulp
low cod
unbleached pulp
cod
washed
Prior art date
Application number
SE0402582A
Other languages
Swedish (sv)
Other versions
SE0402582D0 (en
Inventor
Michael D Vrbanac
Brian Wester
Brian E Dennis
Peter K Lau
Julie A Reimer
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 SE0402582D0 publication Critical patent/SE0402582D0/en
Publication of SE0402582L publication Critical patent/SE0402582L/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

Abstract

A pulp product that has a low COD is comprised of an unbleached pulp that is soaked and washed in alkaline water for a sufficient time so that the COD after soaking and washing is less than or equal to 3.0 kg/1000 kg of dry pul p. The pulp is produced by repetitively soaking and washing an unbleached pulp in alkaline water that is never allowed to drop below pH 7.0. The pulp is soake d and washed for a total of at least 400 minutes at an elevated temperature to produce the pulp product that has a low COD.
SE0402582A 2002-05-15 2004-10-26 Process for producing unbleached pulp with very low COD SE0402582L (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 (2)

Publication Number Publication Date
SE0402582D0 SE0402582D0 (en) 2004-10-26
SE0402582L true SE0402582L (en) 2004-12-08

Family

ID=33476215

Family Applications (1)

Application Number Title Priority Date Filing Date
SE0402582A SE0402582L (en) 2002-05-15 2004-10-26 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
CA2482556A1 (en) 2003-11-27
BR0215714A (en) 2005-02-22
SE0402582D0 (en) 2004-10-26
AU2002309875B2 (en) 2006-08-17
CA2482556C (en) 2008-09-23
NO20045384L (en) 2004-12-09
AU2002309875A1 (en) 2003-12-02

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Legal Events

Date Code Title Description
NAV Patent application has lapsed