柴油微乳体系对生物油增溶性能研究

摘要

利用鼠李糖脂(RL)为表面活性剂,不同碳链长度正构醇为助表面活性剂构建柴油逆胶束体系,进而研究了该体系对模拟生物油的增溶性能.以单位柴油逆胶束增溶生物油的量为评价指标,研究了生物油和柴油的体积比 B/D、醇的种类、醇与表面活性剂的质量比 C/R 及表面活性剂的浓度对生物油增溶性能的影响,并对最佳增溶条件下获得的生物油/柴油微乳体系进行了性能分析,包括元素分析、傅里叶红外分析、热稳定性和燃料产品指标分析等.当生物油与柴油的体积比B/D为3：7,RL浓度为15g/L,助表面活性剂选用正庚醇且醇与表面活性剂的质量比C/R为2.0时,柴油微乳体系增溶生物油的量最大,性能较佳.%Synthetic bio-oil was upgraded by solubilizing bio-oil in diesel by microemulsion technology. Diesel microemulsions were formed with rhamnolipid (RL) as surfactant and different kinds of normal alcohols with varying carbon chain length as cosurfactants. The effects of different microemulsion parameters on the solubilization capacity of bio-oil in diesel were investigated, which include initial bio-oil/diesel volume ratio (B/D ratio), surfactant concentration, cosurfactant type, and the mass ratio of cosurfactant/surfactant (C/R ratio). Meanwhile, fuel properties of bio-oil/diesel microemulsion were examined, which include elemental analysis, FT-IR analysis, thermogravimetric analysis, and other common fuel properties. Experimental results indicated that the proper bio-oil/diesel volume ratio was 3:7, the optimal concentration of RL was 15g/L, and the ideal cosurfactant was heptanol with C/R ratio of 2.0. Bio-oil/diesel microemulsion formed under the optimal solubilization conditions was proven to have fuel properties comparable to diesel.