沉淀法回收生物油高温馏分中的酚类物质

Separating phenols from high-temperature fraction of bio-oil by precipitation

摘要: 为了研究金属离子沉淀法对生物油高温馏分中酚类物质的回收, 提高生物油中化学物质的利用率, 利用气相色谱-质谱联用仪 (GC-MS) 从NaOH试剂浓度、反应温度和反应时间三个方面研究了镁离子对生物油中酚类物质的回收效果。结果表明, 镁离子与酚类物质形成了不溶物, 而且不同浓度的氢氧化钠溶液 (1.0-4.0 mol/L)、不同的反应温度 (25-85℃) 以及不同的反应时间 (5-35 min) 对实验结果有着不同程度的影响。结果表明, 在反应温度为25℃、氢氧化钠浓度为2.5 mol/L, 反应时间在20 min时为最佳反应条件。在此条件下, 对生物油高温馏分中对乙基苯酚的回收率可达34.97%。

Abstract: To improve the utilization of chemicals in bio-oil, recovery of phenolic compounds from high temperature bio-oil fractions by metal ion precipitation was studied.The effects of concentration of sodium hydroxide solution, reaction temperature and reaction time on the recovery of phenolic compounds by magnesium ion were examined using gas chromatography-mass spectrometry (GC-MS).The results demonstrate that the precipitation was formed instead of a salt of magnesium phenols.The optimum reaction conditions are reaction temperature of 25℃, 2.5 mol/L of sodium hydroxide solution, and reaction time of 20 min.In this case, the recovery of 4-ethylphenol from high temperature bio-oil fractions reaches 34.97%.