癸基萘磺酸盐表面活性剂的组成-界面张力关系

Relationship between O/W Interfacial Tension and Composition of Decyl Naphthalene Sulfonate Surfactant

摘要:

本文采用廉价易得的萘和α-癸烯为原料，以氯铝酸离子液体催化合成了中间体癸基萘（DN），再经磺化与中和反应合成了结构明确、组成可调的驱油用阴离子型表面活性剂复合癸基萘磺酸钠(DNS)。中间体DN通过FT-IR和1H NMR进行结构表征，产品DNS采用HPLC-MS分析组成，并测得其克拉夫特点小于0 ℃。测定了DNS对正构烷烃模拟油相的界面性能，结果表明DNS1-1和DNS3均可在较低表面活性剂浓度（0.25 wt.%~0.4 wt.%）下将油水界面张力降低至10-3 mN/m数量级，并且具有良好的耐盐性，不同批次DNS1-1产品均能维持组成基本不变并稳定地重现组成相关的超低界面张力。

Abstract:

An intermediate decyl naphthalene (DN) was synthesized by Lewis acidic ionic liquid catalyzed Friedel-Crafts alkylation reaction from naphthalene and α-decene, and the structure of DN was identified by FT-IR and 1H NMR. Decylnaphthalene sulfonates (DNS), the anionic flooding surfactants with identified structure,tunable composition and Krafft point below 0 ℃ were synthesized from DN following by sulfonation and neutralization, and the compositions of DNS were determined by HPLC-MS. The interfacial tensions of aqueous DNS solutions against normal paraffin simulated oil phases were measured. The experimental results showed that products DNS1-1 and DNS3 could decrease the O/W interfacial tensions to 10-3 mN/m within the lower surfactant concentrations of 0.25 wt.%~0.4 wt.% and played good salt tolerance simultaneously. It was noted that the composition stability and the phenomena of composition-dependent ultralow interfacial tensions were reproducible for different batches of DNS1-1.