论文部分内容阅读
根据纤维素、半纤维素、木质素在高温高压水中分解速度相差很大的特点 ,提出了一条稻壳资源化的新工艺 ,以便减少废弃物、最大限度地得到糖类化合物。新工艺主要包括连续水蒸汽蒸煮爆碎处理、连续近临界水处理和燃烧三步。研究了连续近临界水处理过程中温度和停留时间对液相分解产物的收率和残渣组成的影响 ,并得到了较优的操作条件。通过对新工艺中固形物组成变化的研究得知 :水蒸汽蒸煮爆碎处理过程主要分解半纤维素 ,而连续近临界水处理同时水解纤维素和含硅化合物。新工艺可将约 80 %的碳源转化为水溶性物质 ,其中多聚糖和单糖的收率可达 40 % (wt)以上。新工艺为稻壳的全面综合利用提供了一条新途径。
According to the fact that the decomposition rates of cellulose, hemicellulose and lignin are very different in high temperature and high pressure water, a new technology of resource utilization of rice husk was proposed to reduce the waste and maximize the yield of carbohydrate. The new process includes continuous steam cooking explosion treatment, continuous near-critical water treatment and combustion three steps. The effects of temperature and residence time on the yield and residue composition of liquid decomposition product were studied. The optimal operating conditions were obtained. Through the study on the change of the solid composition in the new process, we know that the steam explosion process mainly decomposes the hemicellulose, while the continuous near-critical water treatment simultaneously hydrolyzes the cellulose and the silicon-containing compound. The new process can convert about 80% of the carbon source into water-soluble substances, of which polysaccharides and monosaccharides yield up to 40% by weight or more. The new technology provides a new way for the comprehensive utilization of rice husk.