Adsorption behavior of methyl palmitate (MP), as a model substance of biodiesel fuel, onto silica surface in the presence of methanol and toluene was investigated, assuming the dry washing purification of biodiesel production process. Methanol and toluene affected amount absorbed of MP, especially methanol greatly affected amount absorbed of MP. The adsorption model was proposed based on the Langmuir type adsorption and two assumptions for competitive adsorption. The equilibrium adsorption constant, K, and the maximum number of the adsorption sites, X_S, were determined by fitting the data to the proposed model. The proposed model agreed well experimental data. The magnitude of K correlated with the dielectric constant of each substance. The occupied surface area of silanol group estimated from X_S was mostly the same as the reported values. These adsorption parameters were verified experimentally with other conditions.

假设生物柴油生产过程为干洗纯化，研究了在甲醇和甲苯存在下作为生物柴油燃料模型物质的棕榈酸甲酯 (MP) 在二氧化硅表面上的吸附行为。甲醇和甲苯对MP的吸收量有影响，尤其是甲醇对MP的吸收量影响较大。吸附模型是基于朗缪尔型吸附和竞争吸附的两个假设提出的。平衡吸附常数K和最大吸附位点数X _S是通过将数据拟合到所提出的模型来确定的。所提出的模型与实验数据吻合良好。K的大小与每种物质的介电常数有关。从X _S估计的硅烷醇基团的占据表面积与报告的值大致相同。这些吸附参数在其他条件下进行了实验验证。