长庆油田石油磺酸盐中活性组分识别

石油磺酸盐中活性组分的识别对于磺化原料油的选择和磺酸盐产品界面活性的稳定具有重要的指导意义.开展石油磺酸盐关键活性物质结构的确定与活性检测研究,可以提升高品质石油磺酸盐生产的可控性.采用液相色谱制备技术,结合质谱分析和界面张力测试评价,从长庆石油磺酸盐样品中成功分离制备出了具有优异界面活性的关键活性组分.试验结果表明,其活性组分占总石油磺酸盐含量的7.3%,可以将油水界面张力快速降至超低(<1.0×10^(-3) mN/m),且具有广泛的油相普适性,对于正己烷~正十六烷油相以及多种油田来源原油,均可将油水界面张力降至超低.此外,活性组分以单磺酸盐为主,平均相对分子质量为414(不含Na^(+)),相对分子质量分布范围在380~450之间,主要组成是以多种同分异构体结构形式存在的十七烷基苯磺酸盐和十八烷基苯磺酸盐混合物.

Identification of Active Fraction in Petroleum Sulfonates from Changqing Oilfield

Identification of active fraction in petroleum sulfonates has great guidance significance to the choice of crude oil and interfacial quality of product, and is be valuable for the production control of petroleum sulfonate products with improved quality, once the key active fraction has been traced and recognized accurately. Active fraction with excellent interfacial activity was successfully separated and obtained from the petroleum sulfonate samples used in Changqing oilfield by the preparative liquid chromatography combined mass spectrum analysis and interfacial tension determination. The results showed that the mass percentage of active fraction was 7.3%, and it could produce ultralow interfacial tension (< 1.0×10-3mN/m) against different oil phases, including n-pentane to n-hexadecane, and crude oils from different oilfields. Besides, the active fraction was mainly mono-sulfonate, and the average molecular weight and molecular weight distribution range were 414 (not including Na+) and 380~450, respectively. The main components were a mixture of heptadecyl benzene sulfonate and octadecyl benzene sulfonate, containing a variety of isomers.