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Preparation method of N-lauroyl-glutamate sodium

A technology of sodium lauroyl glutamate and lauroyl glutamic acid, which is applied in the preparation of carboxylic acid amides, the preparation of organic compounds, chemical instruments and methods, etc., can solve the problem of low solvent removal efficiency, long removal time, and solvent removal. The problem of high content can achieve the effect of high production efficiency, lower production cost and simple process flow.

Active Publication Date: 2015-06-10
JIUJIANG TINCI ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the defects of the existing N-lauroyl sodium glutamate preparation method that the solvent removal efficiency is low, the removal time is too long, and the removal temperature is too high, which will cause the prepared N-lauroyl glutamate The solvent content in the sodium glutamate product is too high and is prone to yellowing; provide a preparation method of N-lauroyl sodium glutamate that can completely remove the solvent acetone without affecting product quality

Method used

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  • Preparation method of N-lauroyl-glutamate sodium

Examples

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Embodiment 1

[0027] A preparation method of N-sodium lauroyl glutamate, comprising the following steps:

[0028] Step 1, condensing lauric acid and glutamic acid in a solvent, in this embodiment, the solvent is acetone;

[0029] In step 2, the material obtained after step 1 is completed is subjected to two acidification liquid separation reactions, and the concrete steps of the two acidification liquid separation reactions are,

[0030] a, the temperature is controlled at 55-60°C, the pH is controlled at 2-2.2, and the material obtained after step 1 is completed is subjected to acidification and liquid separation for the first time;

[0031] b. Take the lower oil phase of the material obtained in step a, conduct secondary liquid separation at a temperature of 70-75° C., and a pH of 1.1-1.5, and take the oil phase to obtain a N-lauroyl glutamic acid mixture.

[0032] Step 3, using the rotating scraper thin film evaporation method to perform solvent removal reaction on the N-lauroyl glutami...

Embodiment 2

[0041] There are many similarities between this embodiment and Embodiment 1, and the similarities will not be repeated, and the differences are briefly described as follows:

[0042] The feed flow rate of N-lauroyl glutamic acid mixture in the rotary scraped film evaporator is 340 Kg / h, the temperature of the outer jacket of the rotary scraped film evaporator is 99.7 °C, and the discharge temperature is 42.5 °C. Sampling analysis . The results showed that the acetone content of N-lauroyl glutamic acid mixture was 5.0%, and the acetone content of N-lauroyl glutamic acid was 0.030%.

Embodiment 3

[0044] There are many similarities between this embodiment and Embodiment 1, and the similarities will not be repeated, and the differences are briefly described as follows:

[0045] The feed flow rate of the N-lauroyl glutamic acid mixture in the rotary scraped film evaporator is 440 Kg / h, the outer jacket temperature of the rotary scraped film evaporator is 88.6 °C, and the discharge temperature is 41.3 °C. Sampling analysis . The results showed that the acetone content of N-lauroyl glutamic acid mixture was 5.0%, and the acetone content of N-lauroyl glutamic acid was 0.036%.

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Abstract

The invention discloses a preparation method of N-lauroyl-glutamate sodium, which comprises the following steps: I. performing condensation reaction to lauric acid and glutamic acid in a solvent; II. performing acidifying skimming reaction to the material obtained in the step I, to obtain an N-lauroyl-glutamic acid mixed solution; III. performing solvent removal reaction to the N-lauroyl-glutamic acid by a rotary scraper thin-film evaporation method; and IV. performing neutralization reaction to the N-lauroyl-glutamic acid, to obtain N-lauroyl-glutamate sodium. The solvent of N-lauroyl-glutamic acid mixed solution is removed by adopting the rotary scraper thin-film evaporation method, so that the energy consumption is small, the production efficiency is high, the product N-lauroyl-glutamate sodium has the advantages of being shallow in color and low in acetone residuals.

Description

technical field [0001] The invention relates to a preparation method of amino acid series surfactants, in particular to a preparation method of N-lauroyl sodium glutamate. Background technique [0002] In recent years, amino acid series surfactants have attracted people's attention because of their safety, biodegradability and excellent surface activity. Sodium N-lauroyl glutamate is an amino acid anionic surfactant synthesized from lauric acid and glutamic acid. It has been widely used in daily chemicals, such as cleansing cream, toothpaste and shaving cream. At present, the industrial production of N-lauroyl sodium glutamate is through condensation reaction, acidification and liquid separation, then neutralization to form salt, and finally powder spraying to obtain N-lauroyl sodium glutamate powder. In the condensation reaction, acetone is often used as a solvent, and the solvent acetone must be removed after acidification and liquid separation. However, the removal proce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C233/47C07C231/02C07C231/12
Inventor 代伟李中生英瑜范乐明
Owner JIUJIANG TINCI ADVANCED MATERIALS CO LTD
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