支链醇醚磺酸盐与两性Gemini表面活性剂的溶液性质研究

Study on the solution properties of branched alcohol ether sulfonate and amphoteric gemini surfactant

关键词:  支链醇醚磺酸盐  复配  相互作用参数  表面张力  界面张力

Key words:  branched chain alcohol ether sulfonate  compound  interaction parameter  surface tension  interfacial tension

摘要:

目的 以支链醇醚TEO、1,3-丙烷磺酸内酯为原料合成了支链醇醚磺酸盐TEOS,测定了支链醇醚TEO、TEOS及两性Gemini表面活性剂GCS12在蒸馏水中的临界胶束浓度(cmc)及临界胶束浓度下的表面张力(γ_cmc),进行支链醇醚磺酸盐与两性Gemini表面活性剂的溶液性质研究。方法 评价了醇醚磺酸盐TEOS与GCS12复配体系的表面活性,并对两者之间的相互作用进行研究,同时也研究了二元复配体系与长庆原油的界面活性。结果 合成的醇醚磺酸盐质量分数达96.5%,耐盐性好；TEO、TEOS、GCS12在蒸馏水中cmc分别为0.05 mmol/L、0.40 mmol/L和0.05 mmol/L,γ_cmc分别为26.02 mN/m、34.58 mN/m和25.27 mN/m；溶液热力学理论研究表明TEOS与GCS12具有明显降低混合溶液临界胶束浓度的中等相互作用；60 ℃下,用模拟地层水配制的混合溶液在n(TEOS)︰n(GCS12)=3︰1时达到最低的界面张力,加盐200 g/L时,界面张力为0.021 mN/m。结论 支链醇醚磺酸盐与两性Gemini表面活性剂的混合体系具有较好的耐温耐盐能力和较高的界面活性,为驱油表面活性剂的开发提供了技术支持。 

Abstract:

Objective The branched alcohol ether sulfonate TEOS was synthesized by branched alcohol ether TEO, 1,3-propane sulfonate as a raw material. The surface tension (γ_cmc) under the concentration of micellar concentration (cmc) and the critical micelle concentration of branched alcohol ether TEO, TEOS, and the amphoteric Gemini surfactant GCS12 in distilled water was determined. The solution properties of branched alcohol sulfonates and amphoteric Gemini surfactants were studied. Methods The surface activity of the alcohol ether sulfonate TEOS and the GCS12 compounding system was evaluated, and the interaction between them was studied. The interfacial activity between the binary compound system and Changqing crude oil was also studied. Results The experimental results show that the content of synthetic alcohol ether sulfonate is 96.5%, it has good salt tolerance. The cmc of TEO, TEOS, GCS12 in distilled water is 0.05 mmol/L, 0.40 mmol/L, 0.05 mmol/L, respectively, and γ_cmc is 26.02 mN/m, 34.58 mN/m, 25.27 mN/m, respectively. The theoretical study of solution thermodynamics showed that TEOS and GCS12 had medium interaction to significantly reduce the critical micelle concentration of mixed solution. The mixed solution prepared with simulated formation water at 60 ℃ reached the minimum interfacial tension when n(TEOS)∶n(GCS12)=3∶1. When the amount of salt is 200 g/L, the interfacial tension is 0.021 mN/m. Conclusion sThe mixing systems of branched alcohol ether sulfonate and amphoteric Gemini surfactant have better temperature resistance and high interface activity, which can provide a technical support for the development of oil displacement surfactant.