Cellulose nitrates from intermediate flax straw

The results of studying the synthesis of cellulose nitrates from oilseed production residues (intermediate flax straw) and subsequent autoclaving of the obtained ethers are presented for the first time. Cellulose was isolated by the dilute nitric acid method, and cellulose nitrates were synthesized using an industrial sulfuric-nitric acid mixture. The resultant sample was autoclaved in three different modes. It was found that cellulose nitrates with the following properties can be obtained from the intermediate flax straw: weight fraction of nitrogen 12.23-12.34%, viscosity 2.7-16.0 cP, and solubility in an alcohol-ether mixture 95-96%. A similarity of the obtained cellulose nitrates and linter Colloxylin was shown by IR spectroscopy. The results of thermogravimetric analysis (TG) and C-13 NMR spectroscopy for cellulose nitrates obtained from intermediate flax straw are presented.