Black liquor is produced as a by-product from the Kraft process when digesting wood into paper pulp removing lignin, hemicelluloses and other extractives fro in the wood to free the cellulose fibers with sodium-based alkali compounds such as sodium hydroxide and sodium sulfide.[1] Dry base black liquor contains ca. 35% of alkali compounds and 65% of lignin-based organics. Most pulp mills have used black liquor as an energy source by burning in recovery boilers.
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