Lauryl betaine preparation method

A technology of dodecyl and dodecyldimethylamine, which is applied in the field of betaine, can solve problems such as failure to meet application requirements, affect product cost, and corrosion, and achieve control of production costs, reduction of corrosion loss, and low price Effect

Active Publication Date: 2017-04-26
杭州海尔希畜牧科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this type of traditional method produces sodium chloride as a by-product during the production process. In the aqueous environment, it is difficult to completely remove sodium chloride. Therefore, the product contains a small amount of sodium chloride, which makes the product unable to meet some high-level requirements. application requirements
At the same time, the presence of chloride ions will cause certain corrosion to conventional equipment, correspondingly increasing equipment requirements, which will also affect the final cost of the product

Method used

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  • Lauryl betaine preparation method

Examples

Experimental program
Comparison scheme
Effect test

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, stir fully and react for 24 hours;

[0028] d. After the hydrolysis reaction is finished, remove the solvent ...

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 Between, fully stirred and reacted for 16 hours;

[0042] d. After the hydrolysis reaction finishes, remove the solve...

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Abstract

The present invention discloses a lauryl betaine preparation method, which comprises: a, adding ethyl 2-(p-toluenesulfonyloxy)acetate andacetone or methanol to a reactor, and completely and uniformly stirring to obtain a mixture; b, adding dodecyl dimethyl dimethylamine to the mixture in a dropwise manner while stirring, and heating and carrying out a complete stirring reaction after completing the adding; c, after completing the substitution reaction, distilling under a conventional atmospheric pressure to remove half of the solvent, adding p-toluenesulfonic acid aqueous solution having a mass concentration of 15-20%, and continuously heating and carrying out the stirring reaction; and d, after completing the hydrolysis reaction, distilling to remove the majority of the solvent, removing impurity ions from the residue by using an ion-type macroporous adsorption resin to obtain a lauryl betaine aqueous solution, and distilling under a conventional atmospheric pressure to remove the water to obtain the viscous liquid lauryl betaine. According to the present invention, with the method, the high quality lauryl betaine can be prepared, and the product equipment corrosion loss can be reduced.

Description

technical field [0001] The invention relates to a betaine, in particular to a method for preparing dodecyl betaine. Background technique [0002] As an important zwitterionic surfactant, lauryl betaine can be compatible with various types of dyes, surfactants and cosmetic raw materials. Because lauryl betaine is not only stable to sodium hypochlorite, but also has excellent stability under acidic and alkaline conditions, and has good compatibility. In addition, lauryl betaine has low skin irritation, good biodegradability, excellent decontamination and sterilization, softness, antistatic properties, hard water resistance and rust resistance, and is increasingly widely used in the daily chemical industry As an important additive, it is widely used in the preparation of shampoos, foam baths, sensitive skin preparations, children's cleaners, etc. It can also be used as fiber, fabric softener and antistatic agent, calcium soap dispersant, sterilizing detergent and rubber indust...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C227/18C07C229/12B01F17/28C09K23/28
CPCC07C227/08C07C227/18C07C303/32C09K23/00
Inventor 楼伟杰徐求文
Owner 杭州海尔希畜牧科技有限公司
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