核桃壳真空热解制备生物油

Vacuum pyrolysis of walnut shell for preparetion of bio-oil

以核桃壳为原料,采用程序升温的方法对其在热解炉反应器中的真空热解规律进行研究,利用红外分析及GC MS分析对裂解生物油进行分析和表征。研究结果表明:核桃壳真空热解制备生物油的最佳工艺参数为终温600℃、升温速率60℃/min、真空度10 kPa、保温时间30 min、冷凝温度40℃,生物油最大产率(质量分数)为55.90%;核桃壳热裂解产物油的成分主要为乙酸、甲酸、乙醇醛、丙酮醇等小分子化合物,愈疮木酚、苯酚、紫丁香酚及其衍生物等芳香化合物,以及呋喃类、酮类化合物等;另外,随着热解终温的升高,小分子化合物的含量有明显的增加,愈创木酚、紫丁香酚及其衍生物的含量逐渐减低,苯酚及其衍生物的含量逐渐增大。

Using walnut shell as raw material, the laws of pyrolysis of walnut shell in the pyrolysis reactor were explored by temperature-programmed methods. The bio-oil prepared by vacuum pyrolysis was analyzed and characterized by fourier transform infrared spectroscopy （FT-IR） and gas chromatography-mass spectrometry （GC-MS）. The results show that the optimal conditions for bio-oil yield are at final pyrolysis temperature of 600 ℃, heating rate of 60℃/min, condensation temperature of-40 ℃, system pressure of 10 kPa and holding time of 30 min; the maximum oil yield is 55.90%. The products of pyrolysis oils are mainly acetic acid, formic acid, glycolal, acetol, and other small molecular compounds, guaiacols, phenols, syringols and other aromatic compounds, furans, ketones, and so on. In addition, with the increase of the final temperature, the content of the small molecular compounds is significantly increases; guaiacol, syringol and their derivatives are gradually reduce while phenol and its derivatives gradually increase.