STUDY OF THE KINETICS OF THE PROCESS OF NITROCELLULOSE SYNTHESIS FROM PURIFIED CELLULOSE

Background. Despite the great potential of nitrocellulose as paints and varnishes, its use is currently limited to the use as a membrane for blood purification (hemodialysis), sorbents for stabilizing donor blood, and also for treating diseases caused by calcium metabolism. Purpose. To solve this problem, it has become necessary to develop and obtain nitrocellulose using local raw materials from industrial waste as a raw material base with a combination of valuable and useful properties. Methodology.To obtain colloxylin from cotton cellulose (or high purity wood pulp), a nitrating mixture of the following composition was used: HNO3 - 20%; H2SO4 - 60%; H2O - 20%. Originality. Cellulose nitrate was synthesized with a degree of substitution of 11.2% (colloxylin) by a new low-concentrated method in a RKC solution. The effect of N2O4 and N2O3 in the process of nitrocellulose synthesis has been studied. Findings. The nitriding process of cotton cellulose based on low concentrated nitric acid was studied. It was established that the esterification of cellulose with nitrating mixtures containing sulfuric acid and nitrogen oxides at different ratios, various samples of NC with a nitrogen content of up to 11.2% were obtained. The degree of substitution of the NС increases with an increase in the excess amount of N2O4 and N2O3 in the composition of the nitrating mixture, which is associated with an increase in the efficiency of water removal from the reaction zone. Highlights: - nitration of cotton cellulose by low concentrated nitric acid; - samples of cellulose nitrate with a nitrogen content of up to 11.2%.