生物油酸性组分分离精制研究

生物油因水分含量高和呈酸性未能作为高品位能源直接规模化应用。利用分子蒸馏技术将生物油水分与酸性组分作为整体对象进行分离，既得到生物油酸性组分富集馏分，又获得了水分含量低、酸性较弱与热值较高的精制生物油Ⅰ（蒸馏重质馏分）与精制生物油Ⅱ（常温冷凝馏分）。同时，具体考察了精制前后生物油的pH值、热值和水分等参数的变化规律。研究表明，生物油的水分与酸性组分得到有效分离，精制生物油Ⅰ和Ⅱ的低级羧酸含量从原始生物油的18.85%分别降低至0.96%和2.2%

Separation of acid compounds for refining biomass pyrolysis oil

The large-scale utilization of biomass pyrolysis oil directly as high-grade energy resources has been quite limited due to its high water content and acidity. The water and acid compounds as a whole, were separated from the pyrolysis oil by molecular distillation. One fraction obtained is rich in acid compounds, and the others are refined bio oilⅠ(heavy distillate fractions) and Ⅱ(room temperature condensate ) which have lower water content, weaker acidity and higher heating value. The physical properties of the crude and refined bio oil, such as the pH value, heating value and water content were studied. The results indicated that water and acid compounds are separated effectively from the crude bio-oil. The content of carboxylic acids in crude bio oil is about 18.85%, while that in the refined bio oilⅠand Ⅱ is decreased to 0.96% and 2.2%, respectively.