复配表面活性剂对布敦岩沥青与水界面性质的影响

摘要

In this research,two kinds of surfactants are compounded to study the adsorption properties of the compound surfactants at the BRA and water interface by debasing the dosage of alkali,then provide guidance for the application of the hot alkali water washing technology.As a result,the adsorption of surfactant on BRA and water interface is affected by the factors such as the ratio of solid and liquid,the time of adsorption,temperature and alkalinity.Under the experimental conditions,when the content of surfactant is 2％,pH is 8,solid-liquid ratio is 1 ∶ 40,temperature is 75 ℃,adsorption time is 90 min,the better adsorption effect achieved.This experiment mainly analyze many factors which influences the separation of BRA by method of hot alkali surfactant,and use the principles of adsorption kinetics and adsorption thermodynamics,the adsorption of surfactant on BRA-water interface are discussed.Adsorption kinetics shows that when the pH is 8,the adsorption rate constant is bigger than that when the pH is 4,while the adsorption activation energy is smaller than that when the pH is 4,indicating that when the pH is 8,it is more advantageous to the reaction.The adsorption thermodynamics shows that the adsorption process of surfactant on BRA and water interface is endothermic,and the adsorption process is spontaneous.Analysis by infrared spectroscopy,under the experimental conditions the adsorption of compound surfactant in BRA and water interface is physical adsorption.%目的 将两种表面活性剂复配,拟减少碱用量,研究表面活性剂在布敦岩沥青与水界面的吸附性能,为热碱水洗分离布敦岩沥青技术的应用提供指导.方法 采用热碱水洗法分离天然沥青油,分析碱度、固液比、温度、吸附时间等条件对布敦岩沥青与水界面吸附性能的影响.结果 复配表面活性剂质量分数为2％时,在pH值为8、固液比为1∶40、温度为75℃、吸附时间为90 min等条件下吸附效果较好.结论 吸附动力学表明,pH值为8时吸附速率常数ka比pH值为4时大,而吸附活化能Ea却比pH值为4时小,说明pH值为8时更利于反应的进行.吸附热力学表明,表面活性剂在布敦岩沥青与水界面的吸附过程是吸热、且自发的过程.红外光谱显示,表面活性剂在布敦岩沥青与水界面的吸附是物理吸附.