Very low COD unbleached pulp
OwnerBrian Wester, Michael D. Vrbanac +4inventors
InventorsBrian Wester, Michael D. Vrbanac, Julie A. Reimer, Peter K. Lau, Brian E. Dennis, David W. Bickell
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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 2.0 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 220 minutes at an elevated temperature to produce the pulp product that has a low COD.
Claims13
A pulp product, comprising unbleached pulp, wherein the pulp product has a COD that is less than or equal to 2.0 kg per 1000 kg dry pulp.
Dependencies are inferred from the claim text.