十二烷基甜菜碱/脂肽复配体系与原油界面行为的研究  

Interfacial Behavior Between Dodecyl Betaine/Lipopeptide Aqueous System and Crude Oil

作　　者：邹爱华[1] 邓雅晴[1] 靳颖[1] 刘方[1] 牟伯中[1] 

机构地区：[1]华东理工大学应用化学研究所,上海200237

出　　处：《油田化学》2012年第4期464-469,共6页Oilfield Chemistry

基　　金：国家自然科学青年基金"表面活性素的定向结构改造;结构与性能研究"(项目编号201003047);中央高校基本科研业务费专项资金"微生物脂肽结构改造及其超低界面张力的研究"(项目编号WK1014024)

摘　　要：在50℃下以3-磺丙基十二烷基二甲基甜菜碱(SDDAB)为主要组分,分别考察了SDDAB/碱、SDDAB-脂肽/碱二元(AS)和ASP三元复合体系与原油之间的动态界面张力。在SDDAB/碱体系中,不同碱降低界面张力的能力顺序为NaOH>Na2SiO3>Na2CO3>NaHCO3;不同复配弱碱降低界面张力的顺序为Na2CO3-Na2SiO3>Na2SiO3-NaHCO3>Na2CO3-NaHCO3。Na2CO3-Na2SiO3的碱性弱于NaOH,降低界面张力的效果优于强碱NaOH,最低界面张力值可达0.00405 mN/m,界面张力稳定值在10-310-2mN/m数量级之间。在Na2CO3-Na2SiO3加量12 g/L,表面活性剂加量0.5 g/L条件下,SDDAB、脂肽质量比为1:1时的协同作用明显,界面张力最低值可达10-4mN/m数量级。碱对界面张力的影响是双向的。对于SDDAB-脂肽/Na2CO3-Na2SiO3二元复合体系,碱加量为12 g/L时的界面张力最低。在该二元体系中加入HPAM(M=2.5×107),界面张力随着HPAM浓度的增加而升高;当HPAM加量为0.4 g/L时,ASP三元体系的动态界面张力仍在10-3mN/m数量级,为性能最佳体系。The dynamic interfacial tension between SDDAB （3-sulfopropyl dodecyl aimethyl ammonium hetaine）/alkli, SDDAB- lipopeptide/alkli binary combinational systems, SDDAB-lipopeptide/alkli/HPAM ternary combinational system and crude oil was studied at 50℃. In the mixed system of SDDAB/alkli, the alkalis were arranged according to their ability of reducing interfacial tension in following order： NaOH 〉 Na2SiO3 〉 Na2CO3 〉 NaHCO3, and compound weak alkali in following order： Na2CO3-Na2SiO3 〉 Na2SiO3-NaHCO3 〉 Na2CO3-NaHCO3. Compound alkali Na2CO3-Na2SiO3 had the highest efficiency in interfacial tension reduction, which was even better than strong alkali NaOH. It could reduce the interfacial tension uhralow with a steady value ranging from 10^-3to 10^-2 mN/m, and the minimum value of interfacial tension reached 0. 00405 mN/m. When the mass concentration of Na2CO3-Na2SiO3 was 12 g/L and that of surfactant was 0. 5 g/L, an evident coordination effect was observed with a lowest interfacial tension approaching to 10-4 mN/m, and the optimum mass ratio for SDDAB and lipopeptide was 1 ： 1. The effect of alkali on interfacial tension was bidirectional. For SDDAB-lipopeptide/Na2CO3-Na2SiO3 system, the lowest interfacial tension was obtained when the mass concentration of compound weak alkali was 12 g/L. The interfacial tension of SDDAB-lipopeptide/Na2CO3-Na2SiO3 system increased with the ascension of HPAM mass concentration. The dynamic inteffacial tension of ASP system, SDDAB-lipopeptide/Na2CO3- Na2SiO3/HPAM, remained in the order of 10^-3 mN/m when HPAM concentration was 0.4 g/L, which was regarded as the superior system with optimum properties.

关 键 词：3-磺丙基十二烷基二甲基甜菜碱 脂肽 复配弱碱 聚合物 动态界面张力 原油 

分 类 号：TE357.46[石油与天然气工程—油气田开发工程] O647.1[理学—物理化学]