CA2482556A1 - Process for producing very low cod unbleached pulp - Google Patents

Process for producing very low cod unbleached pulp Download PDF

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Publication number
CA2482556A1
CA2482556A1 CA002482556A CA2482556A CA2482556A1 CA 2482556 A1 CA2482556 A1 CA 2482556A1 CA 002482556 A CA002482556 A CA 002482556A CA 2482556 A CA2482556 A CA 2482556A CA 2482556 A1 CA2482556 A1 CA 2482556A1
Authority
CA
Canada
Prior art keywords
pulp
low cod
producing
unbleached pulp
cod
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.)
Granted
Application number
CA002482556A
Other languages
French (fr)
Other versions
CA2482556C (en
Inventor
Michael D. Vrbanac
Brian Wester
Brian E. Dennis
Peter K. Lau
Julie A. Reimer
David W. Bickell
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.)
Weyerhaeuser NR Co
Original Assignee
Individual
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 Individual filed Critical Individual
Priority claimed from PCT/US2002/015522 external-priority patent/WO2003097930A1/en
Publication of CA2482556A1 publication Critical patent/CA2482556A1/en
Application granted granted Critical
Publication of CA2482556C publication Critical patent/CA2482556C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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

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 pulp.
The pulp is produced by repetitively soaking and washing an unbleached pulp in alkaline water that is never allowed to drop below pH 7Ø The pulp is soaked and washed for a total of at least 400 minutes at an elevated temperature to produce the pulp product that has a low COD.
CA002482556A 2002-05-15 2002-05-15 Process for producing very low cod unbleached pulp Expired - Fee Related CA2482556C (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
CA2482556A1 true CA2482556A1 (en) 2003-11-27
CA2482556C CA2482556C (en) 2008-09-23

Family

ID=33476215

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002482556A Expired - Fee Related CA2482556C (en) 2002-05-15 2002-05-15 Process for producing very low cod unbleached pulp

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
AU2002309875A1 (en) 2003-12-02
SE0402582L (en) 2004-12-08
SE0402582D0 (en) 2004-10-26
BR0215714A (en) 2005-02-22
AU2002309875B2 (en) 2006-08-17
NO20045384L (en) 2004-12-09
CA2482556C (en) 2008-09-23

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Legal Events

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EEER Examination request
MKLA Lapsed