Process for making very low cod unbleached pulp

Details Process for making very low cod unbleached pulp Process for making very low cod unbleached pulp

D - Textiles, Paper

21

C

D21C 9/02 (2006.01) D21H 11/04 (2006.01)

Patent

CA 2451366

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 7Ø 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.

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