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The influence of the composition of solutions of peracetic acid on a change the characteristics of cellulose during the oxidative-hydrolytic destruction of aspen and pine wood under microwave irradiation has been investigated. Samples of the prepared cellulose were characterized by means of viscometry, X-ray diffraction and IR spectroscopy. It was found that the main factor determining the rate of destruction of cellulose to low degree of polymerization values in acid medium at the initial concentration of peracetic acid not exceeding 15% and initial concentration of hydrogen peroxide no more than 3 mol dm-3 is the concentration of sulfuric acid. The disordering effect of microwave irradiation on the crystallites of cellulose under its preparation from pine wood at the sulfuric acid concentration of 0.06 mol dm-3 and increasing the duration of oxidative-hydrolytic treatment from 1 to 2 h has been revealed. It is shown that the characteristics of the products prepared from aspen and pine wood by oxidative-hydrolytic treatment with 15% peracetic acid under microwave irradiation at the process duration of 1.5–2 h and the sulfuric acid concentration of 0.3–0.7 mol dm-3 correspond to partially oxidized microcrystalline cellulose.
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