多孔介质中石油挥发过程研究

The Volatilization of Petroleum in Porous Media

根据齐鲁石化地区石油污染特点,模拟天然条件下,多孔介质中石油的挥发过程,通过差减法确定石油挥发量与时间的关系。结果表明,Elovich模型和零级动力学方程分别能很好描述多孔介质中汽油和柴油挥发动力学曲线,且汽油在粗砂中的挥发速率系数较在亚黏土中大,而柴油在亚黏土中的挥发速率系数是在粗砂中的2.0~2.5倍。采用线性方程和二项式分别表达多孔介质中汽油和柴油挥发速率系数随含油率增加而增加的趋势。汽油在亚黏土中较在粗砂中的挥发率低,但挥发率一般均在90%以上;经过10 d挥发后,柴油在亚黏土中挥发率为7.2%~37.8%,在粗砂中的挥发率为5.0%~14.0%。

The volatilization process of petroleum in porous media under natural conditions was studied according to the polluted characteristic of Qilu Petrochemical Area. The weight loss of oil was determined by subtracting the pillars＇ pre and post weight measured on an electronic balance. The aim of this paper was to investigate the change of oil＇s volatilization mass in soils with time. The results show that the gaso- line in soils volatilizes at a logarithmic rate with respect to time, and the diesel oil in soils volatilizes at a rate which can be best modelled as a linear of time. The volatilization coefficient of gasoline in grit exceeds that in loam, while the volatilization coefficient of diesel oil in loam is from 2.0 to 2. 5 times higher than that in grit. Oils＇ volatilization coefficients increase with the increase of oil content. Linear equation and binomial equation describe the relationships of gasoline＇s and diesel oil＇s volatilization coefficients with oil content respectively. The volatilization percent of gasoline in porous media for most samples is more than 90%. After volatilizing for 10 days, the volatilization percent of diesel oil in loam is from 7. 2% to 37. 8%, and which in grit is from 5.0% to 14. 0%.