【摘要】 为认识双亲分子化合物对沥青质的稳定作用及机理,采用X射线光电子能谱(XPS)分析了辽河沥青质颗粒表面杂原子官能团的类型和含量;采用紫外-可见光谱(UV-Vis)测定添加双亲分子前后沥青质甲苯-正庚烷溶液中沥青质浓度的变化,进而分析了不同双亲分子化合物对辽河沥青质的分散稳定作用;采用红外光谱(FT-IR)分析初步探讨了十二烷基苯磺酸(DBSA)对沥青质分散稳定作用的机理。结果表明,沥青质颗粒表面含氮官能团主要为碱性的吡啶氮官能团和弱碱性的吡咯氮官能团,含氧官能团主要为碳氧单键和碳氧双键结构,表面杂原子官能团的数量虽然较少,但为沥青质与双亲分子作用的关键因素;双亲分子头部官能团和沥青质颗粒表面杂原子之间的酸碱作用越强,其分散稳定沥青质的能力越强;DBSA通过其磺酸基官能团与沥青质颗粒表面的羟基和氨基形成分子间氢键而吸附在沥青质上。更多还原

【Abstract】 In order to elucidate the effect of amphiphilic molecules on asphaltene stabilization and the stabilizing mechanism,the type and amount of functional groups on the surface of asphaltene particle were analyzed by X-ray photoelectron spectroscope(XPS).And the performance of amphiphilic molecules for asphaltene stabilization was evaluated in correlation with the asphaltene concentration in toluene-n-heptane solution,which was measured by UV-vis spectroscopy.The interaction between dodecylbenzenesulfonic acid(DBSA) and asphaltene was investigated via FT-IR.It was concluded that the nitrogen-containing groups on the surface of asphaltene particle were mainly pyrrolic and pyridinic type,and oxygen-containing groups were mainly carbonyl,lactone,hydroxyl and etheric type.Although with comparatively small amount on surface of asphaltene particle,these functional groups with hetero atoms played an important role in adsorption of amphilic molecules.With stronger acid-base interaction between head group in amphilic molecules and the functional groups on asphaltene particle surface,the amphiphilic molecules could better stabilize asphaltene in toluene-n-heptane solution.And DBSA could be adsorbed on surface of asphaltene particle through the hydrogen bonds between its sulfonic groups and hydrogens in hydroxyls or amidos on asphaltene particle surface.更多还原