Synthesis and Properties of Ethylene Glycol Gemini Sodium 2-Ethyl-1-butanol Sulfosuccinate

Ethylene glycol Gemini sodium 2-ethyl-1-butanol sulfosuccinate was synthesized by the method of using carbonyl solid acid as the catalyst and esterification without organic solvents and sulfonation without any extra phase transfer catalysts at normal atmospheric pressure.The optimal synthetic conditions were as follows:in the single-esterification,n(ethylene glycol)∶ n(maleic anhydride)=1.00∶ 2.10,the amount of carbonyl solid acid was 2% of the amount of maleic anhydride,and the reaction took place at 100 ℃ for 4.7 h,with the esterification rate of 99.21%(mass fraction).In the di-esterification,n(2-ethyl-1-butanol)∶ n(maleic anhydride)=1.30∶ 1.00,and the reaction took place at 210 ℃ for 1 h,with the esterification rate of 95.17%(mass fraction).In the sulfonation,n(sodium hydrogen sulfite)∶ n(maleic anhydride)=1.05∶ 1.00,and the reaction took place at 120 ℃ for 1 h,with the sulfonation rate of 100.65%(mass fraction).The structure of the product was characterized by means of IR and 1HNMR.Its properties were measured:CMC=2.99×10-3 mol/L,γCMC=27.96 mN/m.The emulsifying power was 4.35 min,permeability was 11.6 s and the ability of hard water resistance was 13.3 min.