Abstract
1. The nitration of spruce lignin obtained by mechanical grinding has been carried out with nitric acid in an anhydrous medium under heterogeneous and homogeneous conditions. Fractionation of the nitrolignin has been carried out and the elementary and functional composition of the fractions has been determined; the mean semi-empirical formulas of the C9 structures have been calculated for both fractions. It has been shown that, depending on the nitration conditions, from one to two nitro groups enter the C6-C3 structural element of nitrolignin and, with an excess of HNO3, nitrate groups as well.
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