水稻秸秆的微波液化研究

以苯酚为液化剂,甘油为辅助液化剂,在浓硫酸催化作用下对水稻秸秆进行微波液化。分别研究了液化条件对液化残渣率的影响,并通过单因素试验和正交试验得出最佳反应条件:即在微波功率500 W,液固比为7:1,m(苯酚):m(甘油)为4:1,浓硫酸用量为5%,150 ℃,反应时间22.5 min,所得残渣率最小,为7.17%。凝胶渗透色谱结果显示随着液化时间的延长,液化产物的相对分子质量出现逐渐减小的趋势,而分散系数则略增大。通过液化产物的红外光谱分析发现,纤维素和半纤维素较易降解,液化残渣主要成分是木质素及其衍生物。

Microwave-assisted Liquefaction of Rice Straw

The rice straw was liquefied by microwave heating in the mixture of phenol and glycerol as the liquefying reagents with sulfuric acid catalytic. This paper discussed the effects of different factors on residue rate. The result showed that 7.17% of residue rate remained under the optimum conditions, i.e., microwave power of 500 W, the liquid-solid ratio of 7:1, the mass ratio of phenol and glycerol of 4:1, sulfuric acid amount of 5%, the temperature of 150 ℃ and reaction time 22.5 minutes. The results of GPC showed that with the extension of liquefied time, the relative molecular weight appears decreasing, but of the distributions, increased a bit. From the IR spectrum, it was concluded that the cellulose and hemicellulose are easier to be dissolved and the main ingredients of liquefaction residues are lignin and its derivatives.