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Abstract
Various methods for pretreatment of aspen wood were studied. The methods included the pretreatment of the wood with aqueous solutions of sulfuric and nitric acids and with water-organic (ethanol, butanol) solution of sulfuric acid (organosolvent). The effect of the methods on the conversion of raw material into simple sugars during the enzymatic hydrolysis was comparatively studied. The effects of temperature, acid concentration, composition of the organic phase (for sulfuric acid), and pressure (for nitric acid) on the pretreatment efficiency are analyzed. It is shown that the use of organosolvent of 0,5 % sulfuric acid allows one to increase the reactivity of ground aspen wood by 3–4 times as compared with that of the feedstock. The most effective pretreatment was found to be the pretreatment in a 4,8 % aqueous solution of nitric acid (125 °C, 1,8 MPa, 60 min), which increases the reactivity of ground aspen wood more than by 5 times.
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