Preparation method of alpha-N,N-dialkyl oxyamino fatty acid surfactant

A technology of surfactants and amine oxides, applied in chemical instruments and methods, organic chemistry, chemical/physical processes, etc., can solve the problems of limited dosage of formula products, high synthesis cost of fatty tertiary amines, etc., to reduce production costs and reaction conditions Mild, emulsifying performance enhancing effect

Inactive Publication Date: 2012-07-04
JIANGNAN UNIV
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Problems solved by technology

Since the synthesis process of fatty alcohol catalyzed amination to prepare fatty tertiary amines requires high temperature, high selectivity, high activity and high stability catalysts, the synthesis cost of fatty tertiary amines is relatively high, thus making the price of amine oxide surfactants much higher Compared with other types of surfactants, the amount used in formulated products is limited

Method used

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  • Preparation method of alpha-N,N-dialkyl oxyamino fatty acid surfactant
  • Preparation method of alpha-N,N-dialkyl oxyamino fatty acid surfactant
  • Preparation method of alpha-N,N-dialkyl oxyamino fatty acid surfactant

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Embodiment

[0013] Example 1 Synthesis of α-N,N-dimethylaminopropionic acid oxide

[0014] Add 0.10 mol of α-chloropropionic acid and 0.20 mol of dimethylamine (30% aqueous solution) into a normal-pressure reactor equipped with a thermometer and magnetic stirring, keep the temperature of the oil bath at 40°C, stir for 2 hours, and the reaction is over Finally, the pH of the solution was adjusted to 12 with 2mol / L NaOH, the unreacted dimethylamine was removed by evaporation under reduced pressure, the pH of the solution was adjusted to 5.0 with hydrochloric acid, and the synthetic intermediate was precipitated from the solution. After suction filtration, washing and drying, solid α-N,N-dimethylaminopropionic acid was obtained with a yield of 63.2%.

[0015] In a four-necked flask equipped with a thermometer, a constant pressure dropping funnel, a stirring, and a reflux device, add 500 g of α-N,N-dimethylaminopropionic acid, 0.250 g of EDTA disodium salt, and 0.250 g of citric acid at 20°C ...

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Abstract

The invention discloses a preparation method of an alpha-N,N-dialkyl oxyamino fatty acid surfactant. The method comprises the following steps: allowing alpha-halogenated fatty acid and lower secondary amine to carry out an aminolysis at ambient pressure or in an autoclave to obtain alpha-N,N-dialkyl amino fatty acid; and oxidating by hydrogen peroxide to prepare the alpha-N,N-dialky oxyamino fatty acid surfactant. The oxyamino surfactants are widely used in industries such as tableware detergent, personal care, cosmetic, textile and the like, due to the excellent surface activity, the excellent foaming and foam stabilizing properties, the emulsifying property, the good biodegradation property and low-toxicity and low irritation to human body of the oxyamino surfactants. In the method of the invention, the main raw material is derived from fatty acid which is cheap and easily accessible, and thus the situation that the use amount of the oxyamino surfactants is limited in formula products due to the expensive price will be greatly improved.

Description

technical field [0001] The invention relates to a method of using α-halogenated fatty acid as a raw material, first reacting with lower secondary amines for aminolysis, and then oxidizing hydrogen to synthesize α-N,N-dialkyl oxidized amino fatty acids, which belongs to the synthesis technology of organic compounds field. Background technique [0002] Surfactants containing amine oxide groups have been widely used due to their irreplaceable excellent properties of other types of surfactants. [0003] The usual method for synthesizing surfactants containing amine oxide groups is to prepare fatty tertiary amines by catalytic amination of fatty alcohols, and then oxidize with hydrogen oxides to obtain long-chain alkyl amine oxides. Since the synthesis process of fatty alcohol catalyzed amination to prepare fatty tertiary amines requires high temperature, high selectivity, high activity and high stability catalysts, the synthesis cost of fatty tertiary amines is relatively high,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C291/04B01F17/28C09K23/28
Inventor 齐丽云胡瑜方云
Owner JIANGNAN UNIV
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