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Application Note: Inductive Conductivity in Brown Stock Washing

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Process Analytics - «Application Note»

Background
Paper is made from wood fibres. Fibres in solution are called pulp. Pulp, chemical pulp to be more specific, is simply speaking made by cooking wood chips in certain strong chemical solutions, mostly alkaline solutions. The chemicals at elevated temperatures and pressures decompose the wood. The pulp coming out of the digester is called brown stock because it is still "dirty". It is washed in several stages with increasing cleanliness. Fresh water is added at the end, the last stage washer. From there the washing solution goes to the next stage, becomes more concentrated, goes one stage further, and so on. ......

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