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Preparation method of high-purity lauramidopropyl betaine

A lauryl amidopropyl betaine, high-purity technology, applied in the field of preparation of high-purity lauryl amidopropyl betaine, can solve the problems of the influence of finished products, high cost of multiple recrystallization, complicated purification process, etc., to achieve The effect of reducing impurities, the method is simple and easy to operate, and the steps are simple

Pending Publication Date: 2022-05-24
SHANDONG UNIV
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Problems solved by technology

Although the method of recrystallization can enable people to obtain higher purity products to a certain extent, the process of purification is relatively complicated, and the selection of solvent (single or compound), crystallization temperature, stirring speed, stirring method, process, etc. The choice of saturation and the time of crystallization will have a great impact on the output of finished products; in addition, the cost of multiple recrystallizations is also high

Method used

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  • Preparation method of high-purity lauramidopropyl betaine
  • Preparation method of high-purity lauramidopropyl betaine
  • Preparation method of high-purity lauramidopropyl betaine

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Embodiment

[0040] A preparation method of high-purity lauroamidopropyl betaine, comprising the following steps:

[0041] (1) 20 g of lauric acid was weighed into a three-necked flask, and heated to 70° C. to dissolve completely.

[0042] (2) Start stirring at a stirring speed of 400 r / min, and slowly add 13.445 ml of DMAPA.

[0043] (3) Pass N under stirring 2 After 15 minutes, stop ventilation.

[0044] (4) Keep the stirring speed at 400 r / min, raise the temperature to 180 °C, stop the reaction after 10 h, and cool the product to 70 °C.

[0045] (5) Transfer the sample to a 250ml separating funnel, successively add 50ml ethyl acetate and 10ml 5% sodium chloride aqueous solution by mass, shake for 1min, stand for 10min and remove the lower layer liquid.

[0046] (6) Take the upper layer liquid, repeat step (5) twice, and transfer the sample obtained by three extractions to a 250ml rotary evaporation flask.

[0047] (7) Turn on the rotary steaming, the temperature is 70°C, the rotati...

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Abstract

The invention relates to a preparation technology of lauramidopropyl betaine, in particular to a preparation method of high-purity lauramidopropyl betaine. The method comprises the following steps: carrying out an amidation reaction on lauric acid and 3-dimethylaminopropylamine, purifying an amidation product in the amidation reaction through extraction, carrying out a quaternization reaction on the purified amidation product and chloroacetic acid, and adjusting the pH value of the material after the quaternization reaction to obtain a crude product of lauramide propyl betaine, adding the lauramidopropyl betaine crude product into acetone, stirring and cleaning, and then filtering and drying to obtain the lauramidopropyl betaine. The purification process is simple, and the purity of the lauramidopropyl betaine product can be remarkably improved.

Description

technical field [0001] The invention relates to a preparation technology of lauramidopropyl betaine, in particular to a preparation method of high-purity lauramidopropyl betaine. Background technique [0002] The information disclosed in this Background section is only for enhancement of understanding of the general background of the invention and should not necessarily be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art. [0003] At present, the purity of commercial lauramidopropyl betaine products is mainly 85%, and the price is relatively high. How to maximize the product purity under low-cost conditions has become a problem that everyone pays attention to. According to the inventor's research and understanding, in the preparation process of lauroamidopropyl betaine, the method of multiple recrystallization is often used to purify the quaternized product. Although the me...

Claims

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Application Information

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IPC IPC(8): C07C231/02C07C231/12C07C231/24C07C233/36
CPCC07C231/02C07C231/12C07C231/24C07C233/36
Inventor 郝京诚张立全杨宇杰
Owner SHANDONG UNIV
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