水稻秸杆的液化研究

Study on the liquefaction of rice straw

以苯酚和甘油为液化试剂,在浓硫酸催化作用下对水稻秸秆进行液化,讨论了固液比、m苯酚:m甘油、稻秆粒径、催化剂用量、液化时间和温度等因素对液化残渣率的影响。通过正交实验得出最优反应条件:即当固液比为1∶6,浓硫酸用量为3%,在180℃下反应120min,所得残渣率为2.3%。羟值、酸值的测定和红外分析结果表明:液化过程中羟值和酸值都呈现了先增大后减小的趋势,并在反应后期出现酯缩合反应;液化残渣主要为木质素及其衍生物。

The rice straw was liquefied by the phenol and glycerol as liquefied reagent with sulfuric acid as catalyst, The different influence factors on the residue rate, such as rice straw fiber size, mass ratio of phenol and glycerol, catalyst dosage, solid liquid ratio, liquefied time and reaction temperature were discussed. The result showed that 2. 3% of residue rate can be remained at optimum conditions as below： the solid-liquid ratio was 1： 6, sulfuric acid amount to 3%, at the temperature of and 120minutes of reaction time The analysis results of hydroxyl value test, acid value test and infrared spectrum showed that the hy droxyl value and acid value of liquefaction product increased in the first and then decreased, and appeared ester condensation reaction in the final stage of conversion process. Liquefaction residues were lignin and its derivatives.