Chen Ming-qing
2010
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Journal
Chemical Industry and Engineering Progress
Abstract
Sodium 1,4-butanediol bisulfosuccinate diester was synthesized from 1,4-butanediod, maleic anhydride and 1-octadecanol. The diesterfication reaction was catalyzed with phosphotungstic acid supported on silica (PW12/SiO2). The optimized conditions for the esterification were determined with orthogonal experiments as:molar ratio of 1,4-butanediol bismaleic acid monoester to 1-octadecanol was 1.00 : 2.20, amount of catalyst was ω=1.5%, reaction temperature was 150℃,reaction time was 8h,the esterification rate could reach to 97.2 % and the yield was up to 84.9%. The sulfonation reaction was carried out with the molar ratio of 1,4-butanediol bismaleic acid diester to NaHSO3 of 1.00 : 3.00 and 1.5% catalyst (cetyltrimethylammonium bromide) at 90℃ for 4h,the sulphonation rate could reach to 92.7 % and the yield was up to 74.9%. The obtained sodium 1,4-butanediol bisulfosuccinate diester has a surface tension γcmc of 41.9mN/m,a CMC of 7.2×10-5 mol/L in aqueous solution at 25 ℃,indicating that the surfactant has a low CMC.