Black liquor is a by-product formed during the production of sulfate pulp. It is created when wood chips are boiled together with a chemical mixture, typically sodium sulfate, in the presence of water and high temperatures. During this process, wood fibers are broken down and lignin is dissolved, resulting in a liquid called black liquor. In black liquor, the chemicals used in the cooking process are found, as well as various substances extracted from the wood during cooking.
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