A kind of symmetrical long-chain carboxyl surfactant and its preparation method and application
A surfactant and chain carboxyl technology, applied in the field of environmental science and technology, can solve the problems of eutrophication of water bodies, destruction of ecosystem balance, pollution and environmental protection, etc., and achieve the effects of excellent performance, lower production costs, and less irritation to human skin.
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[0028] Concrete, a kind of preparation method of symmetrical long-chain carboxyl surfactant, comprises the following steps:
[0029] (1) Add dipentaerythritol and hexanoyl chloride into a three-necked flask, wherein the molar ratio of dipentaerythritol and hexanoyl chloride is 1:(3-3.2). After the addition is complete, stir the reaction at 30-50°C for 2-4 hours, and cool to room temperature. Neutralize with sodium hydroxide solution, wherein the concentration of the sodium hydroxide solution is 4-6% (mass fraction). Wash with water, extract with an organic solvent, and distill off the solvent under reduced pressure to obtain viscous liquid intermediate Ⅰ.
[0030] (2) Add the viscous liquid intermediate I obtained in step (1) into a four-necked flask, and the added amount of the viscous liquid intermediate I is 0.025 mol. Then add the first solvent dimethyl sulfoxide (DMSO) into the four-neck flask, and the added amount is 150 mL. After it is completely dissolved, powdered ...
Embodiment 1
[0035] Add dipentaerythritol and hexanoyl chloride into a three-necked flask at a molar ratio of 1:3. After the addition is complete, stir and react at 40°C for 3h, and cool to room temperature. Neutralize with 5% (mass fraction) sodium hydroxide solution, wash with water, extract with organic solvent, and distill off the solvent under reduced pressure to obtain viscous liquid intermediate I. Add 0.025 mol of the viscous liquid intermediate I into a four-neck flask, then add 150mL dimethyl sulfoxide (DMSO) into the four-necked flask, and add 4g of powdered sodium hydroxide after it is completely dissolved and stir at 30°C After reacting for 0.5h, 0.05mol sodium chloroacetate was added to the solution containing dimethyl sulfoxide and other solvents, and the temperature was raised to 80°C. After reacting for 6h, the above solution was subjected to suction filtration to obtain the solid product intermediate II. Add 0.02 mol of solid product intermediate II to 29.24 g of dimethyl...
Embodiment 2
[0037] Add dipentaerythritol and hexanoyl chloride into a three-necked flask at a molar ratio of 1:3.05. After the addition is complete, stir and react at 40°C for 3h, and cool to room temperature. Neutralize with 5% (mass fraction) sodium hydroxide solution, wash with water, extract with organic solvent, and distill off the solvent under reduced pressure to obtain viscous liquid intermediate I. Take 0.025mol of the viscous liquid intermediate I and add it to the four-necked flask, then add 150mL dimethyl sulfoxide (DMSO) into the four-necked flask, and after it is completely dissolved, add 4g of powdered sodium hydroxide and stir the reaction at 30°C 0.5h, then add 0.05 mol sodium chloroacetate into the solution containing dimethyl sulfoxide and other solvents, raise the temperature to 80°C, react for 6h, and filter the above solution with suction to obtain the solid product Intermediate II. Add 0.02 mol of solid product Intermediate II to 29.24 g of dimethylformamide (DMF), ...
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