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AssigneeWeyerhaeuser Company
InventorsBrian Wester, Michael D. Vrbanac, Julie A. Reimer, Peter K. Lau, Brian E. Dennis, David W. Bickell
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A process for making a pulp product that has a low COD is comprised of soaking and washing pulp 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 process includes repetitively soaking and washing an unbleached pulp in alkaline water that is never allowed to drop below pH 7.0. In this process, 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.
A process for making pulp, comprising repetitively soaking and washing unbleached pulp in water that is maintained at an alkaline condition at an elevated temperature to produce a pulp product that 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.