木质纤维素在亚／超临界水中液化的初步研究

The experimental research on liquefaction of lignocellulose in sub-critical and supercritical water

在保持盐浴温度为420℃、压力为25 MPa、反应时间为1 min的实验条件下,对亚/超临界水中木质纤维素的液化进行了实验研究。液化产物经高效液相色谱分析,结果表明,液相产物中含有酸、葡萄糖、果糖及其它一些水溶性有机物。通过扫描电镜(SEM)观察,水解残渣可以明显的发现木质纤维素从粒状高结晶束到粉化成絮状残渣的水解过程,同时发现在盐浴温度为420℃,压力在20 MPa时木质纤维素的液化率最高。

When the reaction temperature is 420 ℃, the press is 25 MPa and the reaction time 1 min, the liquefaction of lignocellulose in subcritical and supercritical water is studied. The products are analyzed by high performance liquid chromatography （HPLC）, the results showed that the liquefied product contains acid, glucose, fructose and other water-soluble productions. Hydrolysis residues by scanning electron microscopy （SEM） can be found lignoceUulose from granular crystal bundle to the hydrolysis process residue of floc, at the same time, we found that when the reaction temperature is about 420 ℃ and the press is 20 MPa, the conversion rate is highest.