【摘要】 研究了实验室自制的高纯度2,4-二甲基-5-(7’-十三烷基)-苯磺酸钠(C13-7Sa)的界面活性。采用旋滴法测定C13-7Sa水溶液-正构烷烃体系的油-水界面张力,采用滴体积法测定C13-7Sa纯水溶液的表面张力。考察了水溶液中NaCl、异戊醇和C13-7Sa浓度对C13-7Sa水溶液-正癸烷体系油-水界面张力的影响。结果表明,使C13-7Sa水溶液-正癸烷体系油-水界面张力达到最低值的C13-7Sa水溶液最适宜的NaCl质量分数、异戊醇体积分数和C13-7Sa质量分数分别为0.15%、1.8%和0.1%,此时,体系油-水界面张力降到1.3×10-3mN/m;C13-7Sa水溶液的临界胶束浓度(cmc)为1.28×10-4mol/L,最小表面张力(γcmc)为26.53 mN/m。说明C13-7Sa具有较好的界面活性。更多还原

【Abstract】 The interfacial properties of the solution of sodium 2,4-dimethyl-5-(7’-tridecyl)benzene sulfonate codenamed C13-7Sa with high purity synthesized in the laboratory were studied.The oil-water interfacial tensions of the system of C13-7Sa solution and n-hydrocarbon were measured by spinning drop method and the surface tension of dilute aqueous solutions of C13-7Sa was measured by drop-volume method.The effects of the NaCl,isoamylol and C13-7Sa concentrations in C13-7Sa solution on oil-water interfacial tension of the system of C13-7Sa solution and n-decane were investigated.The results showed that the best conditions,under which the oil-water interfacial tension of C13-7Sa solution and n-decane system reached 1.3×10-3 mN/m,were NaCl mass fraction of 0.15%,alcohol volume fraction of 1.8% and C13-7Sa mass fraction 0.1% in C13-7Sa solution.The critical micelle concentration(cmc) of C13-7Sa dilute aqueous solution was 1.28×10-4mol/L,at which the surface tension γcmc was 26.53 mN/m.C13-7Sa had good interfacial properties.更多还原