TRANSFORMATIONS OF WHEAT STRAW POLYSACCHARIDES IN DYNAMIC CONDITIONS OF SUBCRITICAL AUTOHYDROLYSIS
Abstract
Behavior of wheat straw polysaccharides in dynamic conditions of subcritical autohydrolysis was examined with a pressure of 30MPa in the temperature range of 150–290 °C. The dependence of the yield of gaseous, liquid and solid products from the process temperature is studied. The formation of liquid products is mainly performed due to the hydrolysis of pentosans and partially of cellulose in the range of 150–200 °С. The main components of the liquid products are oligosaccharide and monosaccharide. The monosaccharide is more than 65% of xylose and arabinose. The temperature rise in the range of 200–290 °С is accompanied by a decrease in medium pH, the hydrolysis of cellulose and intensive gasification. The monosaccharide of liquid products isolated at 270 °С is mainly composed of glucose and no more than 25% of pentose of the amount of monosaccharide. With the temperature rise of the process the maximal yield of sugars is at 200 °C and then it decreased from 29,6 to 5,3% for bone-dry solid matter of the straw at 270 °C. The decrease of the reactivity of cellulose straw treated at 200 °С to enzymatic hydrolysis is established.
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