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Preparation method of modified triethanolamine

A technology of triethanolamine and modification, which is applied in the preparation of organic compounds, chemical instruments and methods, preparation of aminohydroxy compounds, etc., can solve problems such as poor stability and insufficient strength, and achieves low production cost, simple operation and high yield. Effect

Inactive Publication Date: 2017-10-24
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims at the main defects of triethanolamine to insufficient strength and poor stability of cement in the later stage, and provides a method for preparing modified triethanolamine with simple process and low cost.

Method used

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  • Preparation method of modified triethanolamine

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Add 28.00g of maleic anhydride, 74.59g of triethanolamine, and 4.16g of p-toluenesulfonic acid into a 250ml four-neck bottle equipped with a mechanical stirring device, a circulating condensing device, a thermometer, and stir evenly, then raise the temperature, open the circulating condensing pipe, and control the temperature Add 21.03g of maleic anhydride into the reactor three times at a temperature between 100 and 110°C. After the maleic anhydride is added, keep it warm for 2 hours to obtain the modified triethanolamine product. Samples are taken for gas chromatography analysis, and the yield is 88.79%.

Embodiment 2

[0015] Add 28.00g of maleic anhydride, 74.59g of triethanolamine, and 4.16g of concentrated sulfuric acid into a 250ml four-necked bottle equipped with a mechanical stirring device, a circulating condensing device, a thermometer, and stir evenly, then raise the temperature, open the circulating condensing pipe, and control the temperature at 100 Between ~110°C, add 21.03g of acetic acid into the reactor three times. After the maleic anhydride is added, keep it warm for 2 hours to obtain the modified triethanolamine product with a yield of 91.5%.

Embodiment 3

[0017] Add 28.00g of maleic anhydride, 59.67g of triethanolamine, and 4.16g of p-toluenesulfonic acid into a 250ml four-necked bottle equipped with a mechanical stirring device, a circulating condensing device, a thermometer, and stir evenly, then raise the temperature, open the circulating condensing pipe, and control the temperature Add 21.03g of maleic anhydride into the reactor three times at 100-110°C. After the maleic anhydride is added, keep it warm for 2 hours to obtain the modified triethanolamine product. Samples are taken for gas chromatography analysis, and the yield is 94.6%.

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Abstract

The invention relates to a preparation method of modified triethanolamine. The preparation method comprises the following steps: weighing triethanolamine, organic acid and a catalyst according to a preset proportion, firstly adding the triethanolamine, the organic acid and the catalyst into a reactor with a stirring device according to certain proportion, stirring uniformly at a certain temperature, then starting a circulating condensation device, controlling the reaction temperature, and heating for reaction to obtain the modified triethanolamine. The preparation method has the beneficial effects that triethanolamine and organic acid are adopted as reaction materials, due to a large amount of hydroxyl radicals in a molecular structure of the triethanolamine, the symmetrical molecular structure of the triethanolamine can be changed by esterification reaction with the organic acid, and strongly-polar -COO- is grafted in the triethanolamine molecule to obtain the modified alcohol-amine molecule with enhanced grinding-aid performance better than that of the triethanolamine. The preparation method is simple and convenient in operation, low in production cost and higher in yield (up to 95.2%), and is suitable for industrial production.

Description

technical field [0001] The invention is applied in the field of cement production, and in particular relates to a preparation method of modified triethanolamine. Background technique [0002] Alcohol amines have a unique structure and charge distribution, and are usually used as surface active agents, widely used in chemical raw materials, pigments, medicines, building materials and other fields. Triethanolamine is one of many alcohol amines. Triethanolamine is widely used in cement grinding aids and concrete early-strength agents. However, triethanolamine has defects such as high price, poor stability, and insufficient later strength. Contents of the invention [0003] The present invention aims at the main defects of triethanolamine to insufficient strength and poor stability of cement in the later stage, and provides a method for preparing modified triethanolamine with simple process and low cost. [0004] The technical scheme adopted by the present invention to solve ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C213/06C07C219/06C07C219/08C04B24/12C04B20/02
CPCC07C213/06C04B20/023C04B24/122C07C219/06C07C219/08
Inventor 黄从运张岩彭康刘守信
Owner WUHAN UNIV OF TECH
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