Synthesis and Properties of Ethylene Glycol Gemini Sodium 2-Methyl-1-Pentanol Sulfosuccinate

Ethylene glycol Gemini sodium 2-methyl-1-pentanol sulfosuccinate is synthesized by the methed of using carbonyl solid acid as the catalyst without organic solvents in esterification and any extra phase transfer catalysts in sulfonation.The optimal synthetic conditions are as follows:in the single-esterification,n(ethylene glycol):n(maleic anhydride)=1.00:2.10,the amount of carbonyl solid acid is 2% of the amount of maleic anhydride,and reacted under 100 ℃ for 4.7 h with the esterification rate of 99.02%(Mass fraction).In the di-esterification,n(2-methyl-1-pentanol):n(maleic anhydride)=1.30:1.00,and reacted under 210 ℃ for 1.2 h with the esterification rate of 95.34%(Mass fraction).In the sulfonation,n(sodium hydrogen sulfite):n(maleic anhydride)=1.05:1.00,and reacted under 120 ℃ for 3.2 h with the sulfonation rate of 100.64%(Mass fraction).The structure of the product is characterized by IR.And its properties are measured:CMC=2.5×10-3 mol/L,γCMC=27.79 mN/m.Emulsifying power is 11.5 min,permeability is 6 s and the ability of hard water resistance is 13.5 min.Compared with sodium acetate anhydrous and toluenesulfonic acid,the carbonyl solid acid is more catalytic efficiency and easily to be separated.