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Continuous preparation of D-xylose, organic solvent lignin and amorphous ultrafine silica from rice husk

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Document pages: 9 pages

Abstract: Rice husk is a rich agricultural by-product in the world, with an annual output of 80 million tons. The most common treatment method of rice husk is incineration or burial, resulting in serious air pollution and waste of resources. In order to solve this problem, a new method of comprehensive utilization of rice husk is proposed in this paper. Firstly, D-xylose was prepared from hemicellulose by dilute acid hydrolysis. Secondly, lignin was separated from the residue by organic solvent pulping. Finally, amorphous ultrafine silica was prepared by pyrolysis of the residue produced in the second process. In this way, the three main components of rice husk (hemicellulose, lignin and silica) are continuously transformed into three fine chemicals without solid waste. Th yields of D-xylose and organosolv lignin reach 58.2 and 58.5 , respectively. The purity and specific surface of amorphous ultrafine silica reach 99.92 and 225.20 m2 g.

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