微晶纤维素水热降解的液化产物分布

利用管式间歇反应器对微晶纤维素进行水热降解实验研究,考察了反应温度、反应时间和氧化剂对TOC和还原糖产量的影响。结果表明,还原糖的浓度和TOC随着反应温度的升高而增大;而不同的反应时间和氧化剂(H2O2)浓度的条件下,还原糖的浓度和TOC都呈现一个先增高后降低的趋势。微晶纤维素水热降解产生甲酸、乙酸、乳酸、乙二酸、丙烯酸、丙酸、丙二酸、马来酸、丁二酸等有机酸以及二羟基丙酮、丙酮醛和5-羟甲基-2-糠醛(HMF)等。HPLC分析表明,中间产物及不稳定的有机酸最终被氧化成为甲酸和乙酸。

Liquefied Production Distribution of Micro Crystallite Cellulose by Hydrothermal Decomposition

The decomposition of micro crystallite cellulose was investigated by hydrothermal reaction in tube batch reactor. The effect of temperature, time, and oxidant on the TOC and reducing sugar were researched. The results indicate that the TOC and the yield of reducing sugar increase with increasing temperature. The TOC and the yield of reducing sugar increase at first and then declined with the increasing time and hydrogen peroxide. The organic acid, including formic acid, acetic acid, lactic acid, oxalic acid, propenoic acid, propionic acid, malonic acid, maleic acid, succinic acid, were obtained by hydrothermal decomposition. At the same time, dihydroxyacetone, pyruvaldehyde and 5- hydroxymethyl- 2- furaldehyde were also produced. The HPLC analysis show that the intermediate product and the unstable organic acid are oxidized finally into formic acid and acetic acid.