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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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Related references

Sorokin, V.; Bakina, G., 1976: Kinetics of wood delignification with nitric acid. Zhurnal prikladnoi khimii: 49 (12) 2735-2738

Sorokin, V.I.; Bakina, G.G., 1980: Behaviour of different wood species during nitric acid delignification. The time course was studied of delignification of 3-mm chips of (a) Scots pine, (b) Norway spruce, (c) larch, (d) aspen [Populus tremula] and (e) birch with 2 M HNO3 at 80 deg C. After some initial complexity in (a)-(c), delignification rate could...

Gromov, V.S.; Treimanis, A.P.; Khrol, Y.S.; Turauska, M.Y., 1977: Changes in the capillary volume of birch wood during nitric acid delignification. In contrast with sulphate pulping [see FA 36, 6679], nitric acid delignification followed by steam cooking increased capillary vol. to a max. 1.19 cm3/g and cell wall vol. to a max. 1.65 cm3/g after cooking. Subsequent alkali extraction reduced th...

Sorokin, V.; Bakina, G., 1980: Peculiarities of delignification of wood of different species at interaction with the solution of nitric acid. Khimiia drevesiny: (5) 53-59

Sorokin, V.; Bakina, G., 1977: Selectiveness of delignification and dissolution of pentosanes during nitric acid cooking of aspen wood

Gromov, V.; Treimanis, A.; Khrol, I.; Turauska, M., 1977: Change in submicroscopical porosity of birch wood in the process of nitric acid delignification

Bel'-Kova, L.; Gromov, V.; Mikhailov, A., 1980: Polychronic kinetics of the processes of wood delignificatin. I. Process of nitric acid delignification. Khimiia drevesiny: (6) 50-58

Mel'-Kis, A.; Zakis, G.; Neiberte, B.; Kepule, Z., 1980: Studies of lignin produced by the nitric acid method of birch wood delignification. Khimiia drevesiny: (5) 60-66

Mel'-Kis, A.; Zakis, G.; Kepule, Z., 1980: Studies of lignin obtained by the nitric acid method of birch wood delignification. I. Isolation from spent liquor. Khimiia drevesiny: (3) 77-80

Bolker, H.I.; Singh, M.M., 1965: Delignification by nitrogen compounds. II. Pulping Spruce, Birch, Bamboo and bagasse with nitric-nitrous acid mixtures. It is concluded inter alia that, under some economic conditions, the pulping of Bamboo with HNO(sub<3>) may be worth commercial consideration.