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Method for preparing diethanol isopropanol amine

A technology of monoisopropanolamine and diethanolamine, which is applied in the preparation of organic compounds, chemical instruments and methods, preparation of aminohydroxy compounds, etc., can solve problems such as unsatisfactory strength of cement in the later stage, and achieves low cost, high yield, The effect of mild reaction conditions

Inactive Publication Date: 2013-07-31
NINGBO LIANKAI CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Triethanolamine is a very polar alcohol amine, and its aqueous solution is alkaline, which can chelate metal ions in cement and interact with minerals. It is usually compounded with polyols when used, and has a certain grinding effect on cement, and It can quickly improve the early strength of cement, but the later strength of cement is not ideal. To improve the later strength, use triisopropanolamine

Method used

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Embodiment 1

[0013] Refer to figure 1 with figure 2 As shown, a method for preparing diethanol monoisopropanolamine of the present invention, said diethanol monoisopropanolamine is obtained by mixing and reacting diethanolamine, propylene oxide and water in a reactor; its preparation steps as follows:

[0014] a) Add 142.0g of raw material diethanolamine into the reaction kettle, then add 30.2g of water, and mix and stir for 1 hour to obtain a mixture of diethanolamine and water.

[0015] b) Heat the reaction kettle to a temperature of 60°C, then vacuumize the reaction kettle, add 108.0g of raw material propylene oxide in proportion, and use an external circulation reaction kettle at a temperature of 60°C to carry out a cyclic reaction. The cyclic reaction is 2 hours to obtain two The yield of ethanol monoisopropanolamine and diethanol monoisopropanolamine was 96.6%.

[0016] c) After cooling down the diethanol monoisopropanolamine mixture obtained in step b), it is discharged and filled.

Embodiment 2

[0018] Refer to figure 1 with figure 2 As shown, a method for preparing diethanol monoisopropanolamine of the present invention, said diethanol monoisopropanolamine is obtained by mixing and reacting diethanolamine, propylene oxide and water in a reactor; its preparation steps as follows:

[0019] a) Add 220.5g of raw material diethanolamine into the reaction kettle, then add 31.5g of water, and mix and stir for 1.5 hours to obtain a mixture of diethanolamine and water.

[0020] b) Heat the reaction kettle to a temperature of 65°C, then vacuumize the reaction kettle, add 110.4g of raw material propylene oxide in proportion, and use an external circulation reaction kettle at a temperature of 65°C to carry out a cyclic reaction. The cyclic reaction is 4 hours to obtain two The yield of ethanol monoisopropanolamine and diethanol monoisopropanolamine was 97.6%.

[0021] c) After cooling down the diethanol monoisopropanolamine mixture obtained in step b), it is discharged and filled.

Embodiment 3

[0023] Refer to figure 1 with figure 2 As shown, a method for preparing diethanol monoisopropanolamine of the present invention, said diethanol monoisopropanolamine is obtained by mixing and reacting diethanolamine, propylene oxide and water in a reactor; its preparation steps as follows:

[0024] a) Add 284.0g of raw material diethanolamine into the reaction kettle, then add 32.5g of water, and mix and stir for 2 hours to obtain a mixture of diethanolamine and water.

[0025] b) Heat the reaction kettle to a temperature of 70°C, then vacuumize the reaction kettle, add 220.2g of propylene oxide as the raw material in proportion, and use an external circulation reactor at a temperature of 70°C. The yield of ethanol monoisopropanolamine and diethanol monoisopropanolamine was 98.8%.

[0026] c) After cooling down the diethanol monoisopropanolamine mixture obtained in step b), it is discharged and filled.

[0027] The beneficial effect of the preparation method of diethanol monoisoprop...

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Abstract

The present invention discloses a method for preparing diethanol isopropanol amine, which is obtained by the reaction of mixing diethanolamine, propylene oxide and water in a reactor; in the invention, the conventional synthesis reaction of liquid ammonia, ethylene oxide and propylene oxide is not adopted, but the creative reaction of diethanolamine, which is taken as the raw material, and propylene oxide is adopted to obtain the product. The advantages are as following: 1. high yield and short reaction time; 2. mild reaction condition, controllable process, and controllable molecular structure of the product by replacing an active position with propylene oxide on an ammonia molecule; 3. the smell, color and reaction time of the product better than using ammonia by taking high-content diethanolamine as raw material; 4. lower cost than using ammonia, and that makes the product more competitive.

Description

Technical field [0001] The invention relates to a preparation method of diethanol monoisopropanolamine. Background technique [0002] At present, in the cement industry, a large amount of energy is consumed in the grinding of raw materials and clinker; during the grinding process, the free charge density on the surface of cement particles increases, the free energy on the solid surface increases, and the amount of energy between the particles increases. When the cement particles collide with each other, the probability of agglomeration and adhesion increases. If the cement particles are further broken, additional factors are needed to destroy this tendency of agglomeration and adhesion. The use of grinding aids is the simplest and most convenient method. Adding grinding aids requires less investment, quick results, and can effectively improve the physical quality of cement. At present, the more common organic grinding aids at home and abroad are alkanolamines and polyhydric alco...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C215/12C07C213/04
Inventor 陈雪
Owner NINGBO LIANKAI CHEM
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