Carboxylate type anionic Gemini surfactant and preparation method thereof
A surfactant and anion technology, which is applied in the field of carboxylate anionic Gemini surfactant and its preparation, can solve the problems of cumbersome synthesis steps of carboxylate anionic surfactant, difficult operation of purification method, etc., and achieve mature production process. , Wide application range, high surface activity effect
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Embodiment 1
[0041] Embodiment 1: SL-3-SL synthetic route
[0042] Carboxylate-type anionic Gemini surfactant SL-3-SL, the structural formula is as follows:
[0043]
[0044] The synthetic route of SL-3-SL is as follows:
[0045]
[0046]Compound 1 was synthesized from diethyl malonate and n-bromodecane as starting materials. Compound 1 underwent a bilateral substitution reaction with 1,3-dibromopropane to generate compound 6. Compound 6 underwent saponification, acidification, and Acid and acid-base neutralization reaction to obtain the final compound 9 (carboxylate anionic Gemini surfactant SL-3-SL).
Embodiment 2
[0047] Embodiment 2: the synthesis of compound 1
[0048] Diethyl malonate and brominated n-decane were mixed according to the molar ratio of 1.2:1, added to the THF mixed solution containing NaH, stirred at 70°C for 18h, after cooling, the THF was removed by rotary evaporation, and petroleum ether and Extract with ice saturated citric acid solution, let it stand for 10min, take the upper organic liquid layer, and use MgSO 4 Drying, suction filtration, and rotary evaporator to remove petroleum ether, the obtained liquid continued to be distilled under reduced pressure (170°C-174°C / 5mmHg) to obtain the first step product compound 1, yield: 71.6%.
Embodiment 3
[0049] Embodiment 3: the synthesis of compound 6
[0050] Compound 1 and 1,3-dibromopropane were mixed according to the molar ratio of 2.4:1, added to the THF mixed solution containing NaH, stirred at 70°C for about 15 hours, after cooling, the THF was removed by rotary evaporation, and petroleum ether and ice Extract with saturated citric acid solution, let it stand for 10min, take the upper organic liquid layer, and use MgSO 4 Drying, suction filtration, rotary evaporator to remove petroleum ether, the obtained liquid is separated and purified through a silica gel column (silica gel: 300-400 mesh, eluent is pure petroleum ether) to obtain the second step product compound 6, the yield: 54.3%.
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