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A kind of preparation method of amino acid surfactant

A technology for surfactants and amino acids, which is applied in the field of preparation of high-purity amino acid surfactants, can solve problems affecting the quality of amino acid surfactants, low yield of amino acid surfactants, and difficult industrialization control, etc., and achieves excellent appearance and color. Excellent product appearance, wide range of effects

Active Publication Date: 2021-01-15
SHENZHEN HENGWEIXIANG SCI & TECH CO LTD
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0003] The widely used category of amino acid surfactants is formed by the condensation of fatty acid chlorides and amino acids. Solvents and catalysts are often used for the preparation of fatty acid chlorides, which need to be purified, otherwise the quality of amino acid surfactants will be affected, and they will be easily hydrolyzed during use, resulting in The yield of amino acid surfactant is low, the post-treatment is complicated, the industrialization is not easy to control, the efficiency is low, and the cost is high
[0004] Aiming at the problems of low yield, poor color and complex process of amino acid surfactants, the present invention provides a method for preparing high-purity amino acid surfactants, which can significantly increase the yield of various types of amino acid surfactants, and the purity is high. Less than 98%, and the preparation process is simple, the production cost is low, and the efficiency is high

Method used

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  • A kind of preparation method of amino acid surfactant

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preparation example Construction

[0018] The present invention provides a kind of preparation method of high-purity amino acid surfactant, and the technical scheme that it adopts is as follows:

[0019] A kind of preparation method of high-purity amino acid surfactant, concrete steps are as follows:

[0020] (1) At room temperature, add fatty acid and catalyst into a four-necked flask equipped with a thermometer, a stirrer and an exhaust gas recovery device, slowly raise the temperature to 50-70 degrees, add thionyl chloride dropwise or pass through phosgene, and finish adding After reacting the materials for 3-6 hours, fatty acyl chlorides are obtained;

[0021] (2) At room temperature, add amino acid and caustic solution to a four-necked flask with a thermometer and a stirrer, control the pH range to 10-12 by controlling the concentration of caustic, cool to 10-20 degrees through cold water, and simultaneously Add fatty acid chloride and caustic alkali solution dropwise, keep the pH constant during the drop...

Embodiment 1

[0032] (1) At room temperature, add 150 g of myristic acid and 1.43 g of catalyst into a 500 mL four-neck flask equipped with a thermometer, a stirrer and a tail gas recovery device, slowly raise the temperature to 60 degrees, add 90 g of thionyl chloride dropwise, and finish adding After the material was reacted for 4 hours, myristoyl chloride was obtained; (2) at room temperature, 43.9 g of glycine and sodium hydroxide solution (pH 10.2) were added to a 500 mL four-neck flask inserted with a thermometer and a stirrer, and cooled to 15 At the same time, 80g of myristoyl chloride and 27% sodium hydroxide solution were added dropwise to keep the pH constant, and reacted for 5 hours after adding the materials; (3) adding sulfuric acid to adjust the pH to 1.7, then adding cold water, filtering and drying to obtain myristoyl Glycine, 98.6% pure.

[0033] Catalyst preparation: at room temperature, nitrogen gas was continuously introduced, and myristoyl chloride 20g and chloroform 9...

Embodiment 2

[0035] (1) At room temperature, add 160 g of coconut oil fatty acid and 0.5 g of catalyst in a 500 mL four-neck flask inserted with a thermometer, a stirrer and a tail gas recovery device, slowly heat up to 55 degrees, add 73 g of thionyl chloride dropwise, and finish adding After the material was reacted for 5 hours, cocoyl chloride was obtained; (2) at room temperature, 48.4 g of sodium glutamate and sodium hydroxide solution (pH 11.6) were added in a four-necked flask inserted with a thermometer and agitator, and the temperature was lowered by cold water To 20 degrees, dropwise add cocoyl chloride 86g and 25% sodium hydroxide solution at the same time, keep the pH constant, and react for 4 hours after adding the materials; (3) adjust the pH to 1 by adding phosphoric acid, then add cold water, filter and dry to obtain Cocoyl glutamic acid, 99.5% pure.

[0036] Catalyst preparation: at room temperature, continue to feed nitrogen, add cocoyl chloride 22g and dichloromethane 80...

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Abstract

The invention discloses a preparation method of an amino acid surfactant. The specific steps are as follows: (1) at room temperature, add a fatty acid and a catalyst into a four-necked flask, slowly raise the temperature to 50-70 degrees, drop thionyl chloride or pass through Add carbonyl chloride and react for 3-6 hours to obtain fatty acid chloride; (2) at room temperature, add amino acid and caustic alkali solution in a four-necked flask, control the pH range to 10-12, and the temperature is 10-20 degrees, and dropwise Fatty acid chloride and caustic alkali solution, keep the pH constant during the dropwise addition, react for 3-6 hours, and obtain the crude product of amino acid surfactant; (3) add inorganic acid to adjust the pH to 1-2, then add cold water, filter and dry to obtain The final amino acid surfactant product. The invention has low production cost, high efficiency and simple process, is suitable for industrialized production, and under the premise of ensuring high yield and excellent product appearance, the solvent is recovered, which is green and environment-friendly.

Description

technical field [0001] The invention belongs to the technical field of organic compound synthesis, and in particular relates to a preparation method of a high-purity amino acid surfactant. Background technique [0002] Amino acid surfactants have good wettability, foaming, antibacterial, anti-corrosion and antistatic capabilities, basically non-toxic and harmless, mild to the skin, easy to biodegrade, good compatibility with other surfactants, and can be widely used Used in cosmetics, detergents, food, beverages, medicine and health and other fields. [0003] The widely used category of amino acid surfactants is formed by the condensation of fatty acid chlorides and amino acids. Solvents and catalysts are often used for the preparation of fatty acid chlorides, which need to be purified, otherwise the quality of amino acid surfactants will be affected, and they will be easily hydrolyzed during use, resulting in The yield of amino acid surfactant is low, the post-treatment is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C231/02B01F17/28B01F17/22C07C233/47C07C233/49C07C303/22C07C309/14C09K23/28C09K23/22
CPCC07C51/60C07C231/02C07C303/22C09K23/00
Inventor 庞瑾瑜杨平刘九发
Owner SHENZHEN HENGWEIXIANG SCI & TECH CO LTD
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