Abstract: In this study，wheat stalk was pretreated using dilute sulphuric acid and then pyrolyzed under microwave irradiation to produce bio-oil. The products were extracted with cyclohexane，ethyl acetate，methanol and tetrahydrofuran sequentially，and the extraction solutions were analyzed with GC/ MS. The results showed that only a small number of bio-oil components existed，so it easy to separate the high added-value chemicals from the bio-oil. The relative content of 5，6-dihydropyran-2-one in the extractive by cyclohexane was 45.0%，and the relative content of furfural in all of the bio-oil was 45.6%. In addition，the relative content of acids in the bio-oil was 16.0 %，which demonstrated that the bio-oil cannot be used as fuel oil directly due to its high acid content.

Key words: microwave-irradiation, sequentially extract, wheat stalk, bio-oil

摘要： 采用微波辅助条件下热解稀硫酸预处理的麦秆制取生物油，产物采用分级萃取进行固液分离，依次分离出了环己烷萃取物、乙酸乙酯萃取物、甲醇萃取物和四氢呋喃萃取物，并用气相色谱/质谱联用仪（GC/MS）分析了各级萃取物。结果表明，本研究制取的生物油中化合物种类较少，有利于生物油中高附加值化学品的分离，其中5，6-二氢吡喃-2-酮在环己烷萃取物中的相对含量为45.0 %，糠醛在生物油总产物中的相对含量为45.6%。此外，生物油中酸的相对含量为16.0%，表明该生物油含酸量高而不易于直接作为燃料油使用。

关键词: 微波辅助, 分级萃取, 麦秆, 生物油