ENZYMATIC HYDROLYSIS OF LIGNOCELLULOSIC WASTES AFTER XYLITOL PRODUCTION
UDC 661.124
Abstract
Pretreatment of lignocellulosic plant feedstock is an important step for glucose production by enzymatic methods. Acid treatment of birch sawdusts results in dissolution of hemicelluloses with xylose formation. The article considers the reactivity of cellolignin after xylitol production of birch wood at different acid consumption for the hydrolysis process. The yield of products after the enzymatic hydrolysis in the sample treated with increased acid consumption (6.25 g/kg dry wood) was 33.3 g/L, which is 55.6% higher than in the case of the sample treated with less amount of acid (consumption of 3.75 g/kg dry wood). The yield of products of enzymatic hydrolysis of untreated birch was 8 g/l. Thus the reactivity of lignocellulosic wastes for enzymatic hydrolysis increases with the increase of acid consumption at xylitol production from 2.2 to 4 times, respectively. In practice, it is advisable to combine the processes of xylitol production with enzymatic hydrolysis for more efficient utilization of xylan-containing feedstock, the obtaining both xylose and glucose for subsequent production of value-added products.
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