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

该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Friedel-Crafts烷基化反应,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FTIR和1HNMR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质量分数(0.25%～0.4%)下将油水界面张力降低至10-3mN/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。

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