摘要
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 C_8～C_(30)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.
引文
[1]XIA Q,CHEN Z,SHAO Y,et al. Direct hydrodeoxygenation of raw woody biomass into liquid alkanes[J]. Nature Communications,2016,7:11162.
[2]ISIKGOR F,BECER R. Lignocellulosic biomass:A sustainable platform for the production of bio-based chemicals and polymers[J]. Polymer Chemistry,2015,6:4497-4559.
[3]YANG H M,ZHAO W,NORINAGA K,et al. Separation of phenols and ketones from bio-oil produced from ethanolysis of wheat stalk[J]. Separation and Purification Technology,2015,152(25):238-245.
[4]XU W J,ZHAO W,SHENG C,et al. Supercritical ethanolysis of wheat stalk powder over Ca O/Al2O3and Ca O/Al2O3/Fe3O4[J]. Energy&Fuels,2010,24(1):250-252.
[5]TANG S R,ZONG Z M,ZHOU L,et al. Molecular composition of soluble fraction from depolymerized cornstalk powder in supercritical methanol and ethanol[J]. Renewable Energy,2010,35(5):946-951.
[6]冯君锋.木质纤维生物质定向液化和产物提质演变的机理研究[D].北京:中国林业科学研究院,2018.FENG J F. Mechanism of directional liquefaction of lignocellulosic biomass and valorized upgrading conversion of liquefied products[D]. Beijing:Chinese Academy of Forestry,2018.
[7]ZHOU L,ZONG Z M,TANG S R,et al. FTIR and mass spectral analyses of an upgraded bio-oil[J]. Energy Sources,Part A,2010,32(4):370-375.
[8]马艳.竹材溶剂液化及产物精炼过程的基础研究[D].北京:中国林业科学研究院,2018.MA Y. Liquefaction of bamboo biomass and foundation study on the product refining process[D]. Beijing:Chinese Academy of Forestry,2018.
[9]ZHAO W,ZONG Z M,LIN J,et al. Dewaxing from stalks with petroleum ether by different methods[J]. Energy&Fuels,2007,21(2):1165-1168.
