A kind of method for preparing lauryl betaine
A technology of dodecyl and dodecyldimethylamine, which is applied in the field of betaine, can solve problems such as failure to meet application requirements, corrosion, and impact on product costs, and achieve control of production costs, low prices, and reduced corrosion losses Effect
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Embodiment 1
[0024] Embodiment 1: a kind of method for preparing lauryl betaine of this example, its steps are:
[0025] a. add 2-p-toluenesulfonyloxyethyl acetate (258g, 1.0mol) and acetone (2550g) in the three-necked flask that reflux condenser, thermometer, constant pressure dropping funnel and magnetic stirring device are housed, fully Stir well;
[0026] b. Add dodecyldimethylamine (255.6 g, 1.2 mol) dropwise to the mixture while stirring, heat up after the addition, keep the reaction mixture at 55-65°C, and fully stir the reaction for 16 hours;
[0027] c. After the substitution reaction finishes, after half of the solvent is distilled off under normal atmospheric pressure, add an aqueous solution (1290g) of 20% concentration of p-toluenesulfonic acid, and then continue to heat up and stir the reaction, keeping the temperature of the reaction mixture between 45-55°C During, fully stirred and reacted for 24 hours;
[0028] d. After the hydrolysis reaction is finished, remove the sol...
Embodiment 2
[0031] Embodiment 2: a kind of method for preparing lauryl betaine of this example, its steps are:
[0032] a. add 2-p-toluenesulfonyloxyethyl acetate (258g, 1.0mol) and acetone (1300g) in the three-necked flask that reflux condenser, thermometer, constant pressure dropping funnel and magnetic stirring device are housed, fully Stir well;
[0033] b. Add dodecyldimethylamine (213 g, 1.0 mol) dropwise to the mixture while stirring, heat up after the addition is complete, keep the reaction mixture at 55-65°C, and fully stir the reaction for 8 hours;
[0034] c. After the substitution reaction is finished, after half of the solvent is distilled off under normal atmospheric pressure, add an aqueous solution (1290g) of 15% concentration of p-toluenesulfonic acid, and then continue to heat up and stir the reaction, keeping the temperature of the reaction mixture between 45-55°C During, fully stirred and reacted for 8 hours;
[0035] d. After the hydrolysis reaction finishes, remove...
Embodiment 3
[0038] Embodiment 3: a kind of method for preparing lauryl betaine of this example, its steps are:
[0039] a. add 2-p-toluenesulfonyloxyethyl acetate (258g, 1.0mol) and acetone (1900g) in the three-necked flask that reflux condenser, thermometer, constant pressure dropping funnel and magnetic stirring device are housed, fully Stir well;
[0040] b. Add dodecyldimethylamine (234.3 g, 1.1 mol) dropwise to the mixture while stirring, heat up after the addition, keep the reaction mixture at 55-65°C, and fully stir the reaction for 12 hours;
[0041] c. After the substitution reaction finishes, after half of the solvent is distilled off under normal atmospheric pressure, add an aqueous solution (1290g) of 18% concentration of p-toluenesulfonic acid, and then continue to heat up and stir the reaction, keeping the temperature of the reaction mixture between 45-55°C During, fully stirred and reacted for 16 hours;
[0042] d. After the hydrolysis reaction finishes, remove the solven...
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