麦秸秆液化生物油的分离与分析

Separation and Composition Analysis of Bio-oil from Liquefaction of Wheat Stalk

为提高麦秆资源化利用的经济价值,以麦秆在280℃超临界乙醇解液化产物(生物油)为原料,首先利用苯萃取,所得苯可溶物依次进行乙醚萃取、酸碱中和-乙醚萃取将生物油进行分离,萃余物利用硅胶柱层析进行富集分离,以获取高附加值化学品.结果表明,利用乙醚萃取、酸碱中和-乙醚萃取能够有效地分离提取生物油中的羟基酮和酚;而萃余物的成分较为复杂,经进一步的柱层析分离,能够有效富集分离C_8～C_(30)的饱和脂肪烃、萘及烃基萘、烷基环戊烯酮等族组分,此外,经柱层析富集,检测到多种含氮化合物,为进一步明确生物油组成及其提质应用提供参考信息.

Aimed to improve the economic efficiency of wheat stalk and get high value-added chemicals, bio-oil ,prepared from the liquefaction of wheat stalk in supercritical ethanol at 280 ℃, was first extracted by benzene . The benzene-soluble fraction was extracted by ether before and after acid-base neutralization. The residues were future separated by column chromatography. All the separated fractions were analyzed by GC/MS. Results showed that hydroxy-ketones and phenolic compounds were effectively separated by the extraction of ether, and the residues composition was much more complex. Through the separation of column chromatography, components such as C8~C30 alkanes, naphthalene and its derivatives, and alkyl cyclopentenones were enriched and separated. What's more, nitrogen compounds were also enriched and detected by GC/MS, which was helpful to full the composition information of bio-oil.