Using absolute ethanol as solvent synthesis intermediate,triethyenetetramine and long-chain bromoalkanes(carbon)12,14,16 were reacted with 3-chloro-2-hydroxypropane sulfonate to synthesis a series of new sulfonate Gemini surfactant Cn-N4-Cn(n=12,14,16).The structures of intermediate and target product were analyzed by infrared spectroscopy and NMR hydrogen spectroscopy,and the final products synthesized met the expectation.It is found that C12-N4-C12 has a strong surface tension reduction ability to 21.45 mN/m.Besides,its salt resistance can resist the concentration of 48 000 mg/L,and the solution is always in a clear state.With the increase of hydrophobic carbon chain,the salt resistance decreased,i.e.,C16-N4-C16＜C14-N4-C14＜C12-N4-C12.C14-N4-C14 had the best emulsification force of 77.5％,that is,the emulsification strength order of three surfactants:C14-N4-C14＞C16-N4-C16＞C12-N4-C12.
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