出口汽油样品储存时饱和蒸汽压变化研究

Research on Variations of Saturated Vapor Pressure of Export Gasoline Samples in Storage

采用MINIVAP VPS测定仪对出口汽油饱和蒸汽压进行了测定,考察了汽油样品在储存时饱和蒸汽压的变化情况。结果表明:饱和蒸汽压随时间推移而变小,数值变化大小各不相同,最终差值不取决于初始饱和蒸汽压数值;在26 d考察时间内,饱和蒸汽压数值变化最大为2号样品,由52.8 kPa变化到38.2 kPa、变化差值达14.6 kPa;数值变化最小为6号样品,由54.0 kPa变化到51.5 kPa、变化差值仅为2.5 kPa。不同批次汽油储存时的饱和蒸汽压、蒸发性、稳定性及安全性变化是有很大差别的。

Saturated vapor pressure of export gasoline was determined using MINIVAP VPS determinator.Variations of saturated vapor pressure of the gasoline samples in storage are investigated.The result showed that the saturated vapor pressure decreased over time while the numerical variations were different.The final differences did not depend on the initial saturated vapor pressure.During the 26 days of observation,the specimen with the largest variation of saturated vapor pressure was Sample 2,whose pressure varied form 52.8 kPa to 38.2 kPa,and the difference was 14.6 kPa;whereas the specimen with the smallest variation was Sample 6,whose varied from 54.0 kPa to 51.5 kPa,and the difference was only 2.5 kPa.There was a big difference in saturated vapor pressure,evaporability,stability and safety between different batches of petroleum in storage.