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

Active Publication Date: 2018-04-24
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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  • A kind of method for preparing lauryl betaine

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, 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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Abstract

The invention discloses a method for preparing dodecyl betaine. The following steps are adopted: a. adding 2-p-toluenesulfonyloxyethyl acetate, acetone or methanol into a reactor and fully stirring to obtain a mixture; b. Add dodecyldimethylamine dropwise to the mixture while stirring, and heat up to fully stir the reaction after the addition is complete; c. After the substitution reaction is completed, half of the solvent is distilled off under normal atmospheric pressure, and the mass concentration of the addition is 15- 20% aqueous solution of p-toluenesulfonic acid, and then continue to heat up and stir the reaction; d. After the hydrolysis reaction is completed, remove most of the solvent by distillation, and the residue is removed by ionic macroporous adsorption resin to obtain dodecane Base betaine aqueous solution, distilled off water under normal atmospheric pressure to obtain a viscous liquid dodecyl betaine. The beneficial effects of the invention are: high-quality lauryl betaine can be prepared, and corrosion loss of product equipment 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 Patents(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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