Features International Sugar Journal
The Blackboard

Vinasse and black liquor: Incineration [Full subscriber]

The Kraft process for paper making from wood pulp was invented in 1879 and used in 1890. In the early 1930s the recovery boiler enabled the recovery and reuse of the inorganic pulping chemicals from black liquor. A Kraft mill is thus a nearly closed-cycle process with respect to inorganic chemicals, apart from those used in the bleaching process. In the 1940s, the Kraft process superseded the sulphite process. Approximately 7 tons of black liquor are produced to manufacture 1 ton of pulp. Black liquor recovery is now standardized in paper mills; it provides energy to generate steam, cooking chemicals are recovered, and impacts…

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