(1. 后勤工程学院 油品应用工程系， 重庆 400016；
2. 湘潭大学 机械工程学院， 湘潭 411105)
摘 要: 对月桂酸在不同温度下自十二烷溶液中在铁表面的等温吸附进行了实验研究。结果表明： 在298～323 K的温度范围内， 恒温搅拌4 h就基本达到了吸附平衡。 在298 K和323 K两种温度下的吸附等温线均属S型曲线， 说明月桂酸在铁表面形成了表面反胶团或发生了合作吸附。用以两阶段吸附模型为基础的吸附等温线通用公式处理2种温度下的吸附实验数据， 结果表明实验值与拟合曲线有较好的一致性。热力学计算表明： 月桂酸在铁表面的缔合过程不是熵驱动的过程， 故形成的表面缔合物是表面反胶团， 其聚集数约为3；极性基间的极性相互作用或氢键作用在表面反胶团形成过程中起主要作用。
关键字: 月桂酸；铁； 吸附等温线； 两阶段吸附模型； 表面反胶团
（1. Department of Petroleum Applied Engineering，Logistic Engineering College， Chongqing 400016， P.R.China；
2. College of Mechanical Engineering， Xiangtan University， Xiangtan 411105， P.R.China）
Abstract:The isothermal adsorption of dodecanic acid from dodecane solution on iron has been measured under different temperature. The experiment results show that the adsorption equilibrium is obtained after 4 h isothermal stirringduring the temperature from 298 K to 323 K. The adsorption isotherms under 298 K and 323 K are S shape， these indicate that dodecanic acid forms surface inverse micelles on iron or leads to cooperative adsorption. The adsorption experiment data under two temperature are handled using the general formula of adsorption isotherm based on two stages adsorption model， the results show that the experiment data are in good accordance with the theoretical curve. Thermodynamical calculation results indicate that surface association process of dodecanic acid on iron isnot an entropy drive process， so the association material on iron is surface inverse micelle， the gathering amount is about 3. The polar mutual action betweenpolar groups and hydrogen bond action plays a chief role in forming the surface inverse micelle.
Key words: dodecanic acid； iron； adsorption isotherms；two stages adsorption model； surface inverse micelle
