Identification of petroleum acids in Liaohe super-heavy oil
摘要
In this study,petroleum acids were extracted from the super-heavy oil of Liaohe oilfield,North-east China,by using acetic acid,and their structural components and properties were investigated by using FT-IR and MS.Moreover,the trace metal contents in the super-heavy oil sample before and after acetic acid treatment were also measured in this work.The results showed that naphthenic acids were the main component of petroleum acids in Liaohe super-heavy oil,and the content of naphthenic acids with double rings was higher than that of other naphthenic acids.It can be concluded that petroleum acids in Liaohe super-heavy oil mainly consist of naphthenic acids,with a carbon number of around 11-69 and containing one to six naphthenic rings and/or one to two aromatic rings,and mainly exists in form of metal salts of petroleum acid.The molecular weight of petroleum acids is in the range of 190-1000.