Ba2+沉淀法提取生物油馏分中的酚类物质

从NaOH试剂浓度、反应温度与反应时间三个方面，对钡离子沉淀法提取不同温度段收集的生物油馏分中的酚类物质进行了实验研究，并利用气相色谱-质谱联用仪（GC-MS）对提取效果进行了分析。实验结果表明，钡离子沉淀法对愈创木酚类物质的提取效果较为突出，且NaOH浓度（1.0-6.0mol/L）、反应温度（30-50℃）与反应时间（10-40min）对愈创木酚的提取率影响较大。在NaOH浓度为5.5mol/L、反应温度为35℃、反应时间为20min时，提取率达到最大，其中，三个温度段收集的生物油即低温水相馏分、低温油相馏分与高温馏分中的愈创木酚提取率分别为34.1%、33.8%和33.5%。

Separating phenols from different fractions of bio-oil by precipitation of Ba2+

The phenolic substances in the bio-oil fractions collected at different temperature intervals were extracted by barium ion precipitation method at different concentrations of NaOH reagent, reaction temperatures and reaction times, and the extraction effect was analyzed by GC-MS. The results show that the effect of barium ion precipitation on guaiacols separation is more outstanding. The temperature (30-50℃), concentration of NaOH (1.0-6.0 mol/L) and reaction time (10-40 min) have great influence on the extraction rate of guaiacols. The optimum reaction parameters include the NaOH solution of 5.5 mol/L, the temperature of 35℃ and the reaction time of 20 min. Under the optimum condition, the extraction rate of guaiacols in the three fractions of low temperature water, low temperature oil and high temperature are 34.1%, 33.8% and 33.5%, respectively.