Weyerhaeuser Company Limited

Michael D. Vrbanac

Brian Wester

Julie A. Reimer

Peter K. Lau

Brian E. Dennis

David W. Bickell

Brian E Dennis

Michael David Vrbanac

Julie A Reimer

Peter K Lau

David W Bickell

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.

Process for producing very low COD unbleached pulp

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.

Process for making a very low COD unbleached pulp

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Brian E Dennis