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Method for synthesizing ethylene stearamide with octadecanoic acid

A technology of stearic acid amide and stearic acid, which is applied in the direction of carboxylic acid amide preparation, carboxylic acid amide separation/purification, chemical instruments and methods, etc., can solve problems such as dull color, incomplete reaction, and reduced yield, and achieve The effect of good product color, shortened reaction time, and simple process

Inactive Publication Date: 2010-03-10
RUGAO SHUANGMA CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The traditional stearic acid synthesis of ethylene stearic acid amide, the process temperature conditions are low temperature, which will lead to incomplete reaction and reduce the yield; secondly, the final product obtained due to the oxidation in the reaction process makes its color dim, affect product sales

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] Pass 2 moles of stearic acid and 1.02 moles of ethylenediamine under the antioxidant 2,6-di-tert-butyl-p-methylphenol and the catalyst phosphoric acid, and pass nitrogen into it. After one minute, reduce the flow rate to 2-4 bubbles / second, and then heat to melt the stearic acid. When the temperature rises to 80°C, start to add ethylenediamine dropwise. After dropping, keep it at 160°C for 1 hour to change to low-temperature dehydration; then raise the temperature to 220°C, and react for 0.5 Hours, complete the high-temperature reaction and dehydration procedures; finally let the temperature of the material drop to 150-170 ° C and discharge, and become a finished product. Using this process to react, the yield of the obtained ethylene stearic acid amide is 96.8%, and the color is white.

Embodiment 2

[0010] Pass 2 moles of stearic acid and 1.04 moles of ethylenediamine under the antioxidant 2,6-di-tert-butyl-p-methylphenol and the catalyst phosphoric acid, and pass nitrogen gas into it, and reduce the flow rate to 2-4 bubbles after one minute / second, and then heat to melt the stearic acid. When the temperature rises to 84°C, start to add ethylenediamine dropwise. After dropping, keep warm at 160°C for 1 hour to change to low-temperature dehydration; then raise the temperature to 225°C, and react for 0.5 Hours, complete the high-temperature reaction and dehydration procedures; finally let the temperature of the material drop to 150-170 ° C and discharge, and become a finished product. Using this process to react, the yield of the obtained ethylene stearic acid amide is 96.8%, and the color is white.

Embodiment 3

[0012] Pass 2 moles of stearic acid and 1.01 moles of ethylenediamine under the antioxidant 2,6-di-tert-butyl-p-methylphenol and the catalyst phosphoric acid to pass nitrogen gas, and after one minute, reduce the flow rate to 2-4 bubbles / second, and then heat to melt the stearic acid. When the temperature rises to 90°C, start to add ethylenediamine dropwise. After dropping, keep it at 165°C for 1 hour to change to low-temperature dehydration; then raise the temperature to 230°C, and react for 0.5 Hours, complete the high-temperature reaction and dehydration procedures; finally let the temperature of the material drop to 150-170 ° C and discharge, and become a finished product. The process is adopted to carry out the reaction, and the yield of the obtained ethylene stearic acid amide is 95.5%, and the color is white.

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PUM

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Abstract

The invention discloses a method for synthesizing ethylene stearamide with octadecanoic acid, comprising the following steps: octadecanoic acid, antioxidants and catalyst phosphoric acid are added ina boiling flask, nitrogen flows in at large flow rate, and then the octadecanoic acid is heated and melted down, when the temperature is 80-100 DEG C, ethene diamine is dropwise added for reaction for0.5-1 hour, and then high-temperature reaction is carried out for obtaining finished products. The method has the advantages that: 1. the process flow is simple and the reaction condition is not strict: the ethene diamine is added to lead the octadecanoic acid to be reacted completely at the temperature of 80-100 DEG C, and the conversion of the octadecanoic acid can be improved by heat insulation. 2. The reaction time is shortened: the method adopts dehydration at low temperature and then high-temperature reaction is carried out, so as to protect color well. 3. The product has good color andluster: as BHT antioxidants and the process conditions are adopted, the color and luster of the product are kept to be well.

Description

technical field [0001] The invention relates to a method for synthesizing ethylene stearic acid amide with stearic acid, in particular to a method for synthesizing ethylene stearic acid amide with stearic acid which uses an antioxidant to prevent product decolorization. Background technique [0002] The traditional stearic acid synthesis of ethylene stearic acid amide, the process temperature conditions are low temperature, which will lead to incomplete reaction and reduce the yield; secondly, the final product obtained due to the oxidation in the reaction process makes its color dim, affect product sales. Contents of the invention [0003] The main task of the present invention is to provide a method for synthesizing ethylene stearic acid amide from stearic acid, in particular to a stearic acid with simple process, less severe reaction conditions, short reaction time and better product color. Method for synthesizing ethylene stearic acid amide. [0004] In order to solv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C233/36C07C231/02C07C231/22
Inventor 曲晓丽姚炎华
Owner RUGAO SHUANGMA CHEM
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