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Method for synthesizing octadecyl methyl dihydroxyethyl ammonium bromide by using microwave

A technology of octadecyl methyl dihydroxyethyl ammonium bromide, microwave synthesis, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry and other directions, can solve problems such as no reports, and achieve energy consumption The effect of less, higher conversion rate and higher reaction rate

Inactive Publication Date: 2010-12-01
GUANGZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But, aspect synthetic octadecylmethyl diethyl ammonium bromide, still do not see any report

Method used

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  • Method for synthesizing octadecyl methyl dihydroxyethyl ammonium bromide by using microwave
  • Method for synthesizing octadecyl methyl dihydroxyethyl ammonium bromide by using microwave
  • Method for synthesizing octadecyl methyl dihydroxyethyl ammonium bromide by using microwave

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Add N-methyldiethanolamine (0.02mol) and bromooctadecane (0.02mol) in a molar ratio of 1:1 into a flat-bottomed flask, and measure 10ml of ethanol, n-propanol, n-butanol, and n-pentanol respectively and n-hexanol were dissolved and mixed evenly, and the microwave reflux synthesis was carried out under the condition that the microwave power was 600W and the reaction time was 25min.

[0048] The conversion rates of the above reactions were evaluated, and the results are shown in Table 1.

[0049] The influence of table 1 solvent on conversion rate

[0050]

[0051]It can be seen from the results that in the above 5 reactions, the reaction solution gradually turned from colorless to yellow, and the color gradually deepened and the viscosity increased. The color of the product can directly reflect the conversion rate of the reactant. As can be seen from the above table, the conversion rate is the highest when n-hexanol is used as solvent. This may be because the polar...

Embodiment 2

[0053] Add N-methyldiethanolamine (0.02mol) and bromooctadecane (0.02mol) with a molar ratio of 1:1 into a flat-bottomed flask, measure 10ml of n-hexanol, mix and dissolve, and react separately under a microwave power of 600W 5, 10, 15, 20, 25 minutes. see results figure 1 shown.

[0054] As can be seen from the results, the reaction time will have a higher conversion rate above 20min, this is due to the prolongation of time, the probability of collision between molecules increases greatly, so that the reaction tends towards completeness, when the reaction time is 25min, the conversion rate is 93.87%. Although the reaction time was further extended later, the increase in the conversion rate was not large. This may be because the concentration of the reactants decreased, which made the gradient of the reaction decrease. At the same time, based on the consideration of production energy consumption, 15-25min was selected as the microwave irradiation time. the optimization rang...

Embodiment 3

[0056] Add N-methyldiethanolamine (0.02mol) and bromooctadecane (0.02mol) in a molar ratio of 1:1 into a flat-bottomed flask, and measure 8, 9, 10, 11, 12, 15, 18ml of n-hexanol, under the microwave power of 600W, react for 25min. The result is as figure 2 shown.

[0057] It can be seen from the results that the conversion rate increases with the increase of the solvent volume, and the conversion rate is the largest when the solvent volume is 11 mL, but the conversion rate decreases when the solvent volume continues to increase. This is because the volume of the solvent is too small and the viscosity is too high, which is not conducive to the reaction. Increasing the volume of the solvent and the uniform mixing of the reactants increases the probability of collision between molecules, which is conducive to the reaction. However, as the volume of the solvent continues to increase, the solvent will absorb more energy from the reaction system, reducing the energy obtained by t...

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Abstract

The invention belongs to a method for synthesizing octadecyl methyl dihydroxyethyl ammonium bromide by using microwave. N-methyldiethanolamine and octadecyl bromide are used as raw materials, and n-hexanol or n-pentanol is used as a solvent. The method comprises the following steps of: performing microwave reflux under the power of 400 to 600W, and reacting the raw materials for 15 to 25 minutes to obtain octadecyl methyl dihydroxyethyl ammonium bromide, wherein the obtained the octadecyl methyl dihydroxyethyl ammonium bromide is a crude product; and re-crystallizing the crude product for several times by using acetone, filtering the solution to obtain bright white crystal, and drying the crystal to obtain the high-purity octadecyl methyl dihydroxyethyl ammonium bromide, wherein the purity reaches over 99 percent. The synthesizing method has short reaction time and lower energy consumption; compared with a traditional heating method, the reaction rate is improved by nearly 23 times; and the method has high conversion rate which can reach over 95 percent, has high utilization rate of raw materials, and further saves the cost.

Description

technical field [0001] The invention belongs to the field of chemical industry and relates to a method for synthesizing octadecylmethyldihydroxyethylammonium bromide by microwave. Background technique [0002] With the rapid development of science and technology and the continuous emergence of new processes, new materials and new technologies, the application of surfactants known as "industrial monosodium glutamate" is also becoming more and more extensive. Among them, cationic surfactants exhibit unique properties such as antistatic properties, bactericidal properties, and softness due to their special structures. These special properties cannot be replaced by other types of surfactants. Studies have shown that anionic and cationic surfactants exhibit better surface activity when used in combination. However, in most cases, when anionic and cationic surfactants meet, they will form precipitates and lose their surface activity. In recent years, the application fields of ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C215/40C07C213/00B01J19/12
Inventor 郑成程文静毛桃嫣
Owner GUANGZHOU UNIVERSITY
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