Sulphite process for wood pulp, 1898

Sulphite process for wood pulp, 1898

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Credit: SCIENCE PHOTO LIBRARY

Caption: Sulphite process for wood pulp. 19th-century artwork of a large chemical vat being used in the sulphite process for producing wood pulp for the manufacture of paper. Various sulphites, usually from sulphurous acid, are used to digest wood chips and extract lignin, leaving behind the cellulose fibres used in paper products. Artwork from the 22nd volume (second period of 1898) of the French popular science weekly 'La Science Illustree'.

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