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Method of synthesizing axungia alkyl dimethyl group amine oxide

A technology of aliphatic alkyl dimethyl amine oxide and aliphatic alkyl dimethyl tertiary amine is applied in the field of synthesizing amphoteric surfactants in organic chemistry, and achieves the advantages of improving product yield, reducing energy consumption and improving charging coefficient. Effect

Inactive Publication Date: 2008-01-23
王伟松
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But because this reaction is a two-phase reaction, it usually takes 8 to 12 hours of reaction time to achieve a higher yield.

Method used

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  • Method of synthesizing axungia alkyl dimethyl group amine oxide
  • Method of synthesizing axungia alkyl dimethyl group amine oxide
  • Method of synthesizing axungia alkyl dimethyl group amine oxide

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Add 2130kg dodecyldimethyl tertiary amine, a certain amount of deionized water, 21.3kg citric acid, 21.3kg ethylenediaminetetraacetic acid disodium salt, 21.3kg tetrabutylammonium bromide catalyst in the jacketed reactor , heated to 55-60°C, and after 15 minutes of stabilization, began to slowly add 1237kg of 27.5% aqueous hydrogen peroxide solution dropwise. Control the dropping speed and turn on the cooling water appropriately to keep the system temperature within the range of 55-65°C. After dripping the aqueous hydrogen peroxide solution, continue the insulation reaction for 2.0 h. Then, the temperature was raised to 75-80° C., and the reaction was kept for 2.0 hours. A light yellow liquid is obtained, which is dodecyl dimethyl amine oxide.

[0020] The reaction equation in the above-mentioned embodiment is:

[0021]

Embodiment 2

[0023] Add 2970kg octadecyldimethyl tertiary amine, a certain amount of deionized water, 148.5kg citric acid, 148.5kg ethylenediaminetetraacetic acid disodium salt, 297kg hexadecyl trimethyl bromide in the jacketed reactor ammonium catalyst, heated to 55-60°C, and after 15 minutes of stabilization, began to slowly add 1020kg of 50% hydrogen peroxide aqueous solution dropwise. Control the dropping speed and turn on the cooling water appropriately to keep the system temperature within the range of 55-65°C. After dripping the aqueous hydrogen peroxide solution, continue the insulation reaction for 2.0 h. Then, the temperature was raised to 75-80° C., and the reaction was kept for 2.0 hours. Finally, 520 kg of sodium bisulfite was added, and the mixture was incubated and stirred for 0.5 hour to obtain a light yellow liquid, which became a white paste after cooling, which was stearyl dimethyl amine oxide.

[0024] The reaction equation in the above-mentioned embodiment is:

[00...

Embodiment 3

[0027] Add 2690kg hexadecyldimethyl tertiary amine, a certain amount of deionized water and 95% ethanol, 53.8kg citric acid, 53.8kg ethylenediaminetetraacetic acid disodium salt, 107.6kg tetrabutyl Ammonium bromide catalyst, heated to 55-60 ° C, after 15 minutes of stabilization, began to slowly add 1360 kg of 30% hydrogen peroxide aqueous solution dropwise. Control the dropping speed and turn on the cooling water appropriately to keep the system temperature within the range of 55-65°C. After dripping the aqueous hydrogen peroxide solution, continue the insulation reaction for 2.0 h. Then, the temperature was raised to 75-80° C., and the reaction was kept for 2.0 hours. Finally, 208 kg of sodium bisulfite was added, and the mixture was incubated and stirred for 0.5 hour to obtain a light yellow liquid, namely hexadecyldimethylamine oxide.

[0028] The reaction equation in the above-mentioned embodiment is:

[0029]

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Abstract

A synthetic method of the fatty alkyl dimethyl amine oxide is provided, which belongs to the synthesis technology field of the amphoteric surface reactive agent in the organic chemical. The fatty alkyl dimethyl amine and the hydrogen peroxide are utilized as raw materials and perform oxidation reaction in the polar dielectric under the condition that the hydrogen peroxide stabilizer and the phase transfer catalyst exist; the sodium bisulfite is added to remove the residual hydrogen peroxide after reaction to produce the fatty alkyl dimethyl amine oxide; the phase transfer catalyst is the tetrabutylammonium bromide or the hexadecyl trimethyl ammonium bromide and the addition of the phase transfer catalyst is 1 per cent to 10 per cent of the weight of the fatty alkyl dimethyl amine; the mol ratio between the fatty alkyl dimethyl amine and the hydrogen peroxide is 1 : 1.0 to 1.5. The invention reasonably utilizes the phase transfer catalyst and greatly shortens the reaction time and increases the product yield through reasonably adjusting the addition and mixture ratio of the fatty alkyl dimethyl amine and the hydrogen peroxide and optimally selecting the reaction temperature and time.

Description

technical field [0001] The invention relates to a synthesis method of fatty alkyl dimethyl amine oxide, which belongs to the technical field of synthesis of amphoteric surfactants in organic chemistry. Background technique [0002] Amine oxides are oxides in which oxygen is directly combined with nitrogen atoms in tertiary amine molecules. In addition to the surface activity of general surfactants, it also has extremely low physiological toxicity that cannot be compared with other surfactants, has no irritation to the skin and is soft to the touch, moisturizing, sterilizing, and mildew-proof. Fatty alkyl dimethyl amine oxide is the largest product in this series. [0003] Fatty alkyl dimethyl amine oxide exhibits non-ionic or cationic properties in aqueous solution, depending on the acidity and alkalinity of the solution, mainly exists in non-ionic form in alkaline solution, and is cationic in acidic solution. It is mainly used in the preparation of dishwashing detergent a...

Claims

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Application Information

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IPC IPC(8): C07C291/04
Inventor 王伟松王新荣孟照平李福强
Owner 王伟松
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