Process for producing very low COD unbleached pulp

Details Process for producing very low COD unbleached pulp Process for producing very low COD unbleached pulp

2007-06-05

2007-06-05

Hug, Eric (Department: 1731)

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With washing

C162S017000, C162S070000, C162S071000, C162S090000

Reexamination Certificate

active

10209446

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 7.0. 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.

REFERENCES:
patent: 2030383 (1936-02-01), Luth et al.
patent: 2054854 (1936-09-01), Dreyfus
patent: 2645576 (1953-07-01), Bate et al.
patent: 4274913 (1981-06-01), Kikuiri et al.
patent: 4806203 (1989-02-01), Elton
patent: 4971658 (1990-11-01), Henricson et al.
patent: 5429717 (1995-07-01), Bokstrom et al.
patent: 6245196 (2001-06-01), Martin et al.
patent: 2002/0112827 (2002-08-01), Merkley et al.
patent: WO 95/20066 (1995-07-01), None
patent: WO 02/33164 (2002-04-01), None
“Forming Handsheets For Physical Tests of Pulp,”TAPPI, T 205 sp-95, 1995 pp. 5-7.
“Moisture In Pulp, Paper and Paperboard,”TAPPI, T 412 om-94, pp. 1-3.
Harper, S., and M. Grenggs, “Resin Extraction and Effects on Pulp Quality,”Proceedings of the 54th Appita Annual Conference, Melbourne, Apr. 3-6, 2000, pp. 575-580.
Stromberg, C.B., “Washing For Low Bleach Chemical Consumption,” in Thomas W. Joyce (ed.),Environmental Issues: A TAPPI Press Anthology of Published Papers, TAPPI Press, Atlanta, 1990 pp. 230-238.
Stromberg, C.B., Washing Of Dissolved Organic Solids From Pulp,Paper Asia, Oct. 1994, pp. 32-39.

Affiliated with

Also associated with

Rating

Process for producing very low COD unbleached pulp does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for producing very low COD unbleached pulp, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for producing very low COD unbleached pulp will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3857018