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Delignification with nitric acid

, : Delignification with nitric acid. Izvestiya Vysshikh Uchebnykh Zavedenii, Lesnoi Zhurnal ( 3): 89-95

Wood chips and sawdust of birch and spruce were treated in a 2-stage process with nitric acid (conc. 50-90 g/litre) and then with dilute aqueous ammonia at temperatures not exceeding 90 degrees C. Polarographic and spectrophotometric studies were made of the extracts, and also the polymolecular and functional composition of the ammonia extracts.

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