Preparation method of N-methyl sodium taurate

A technology of sodium methyl taurine and methyl taurine is applied in the preparation of sulfonates, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., and can solve complex process steps and difficult Recycling and application, product separation difficulties and other problems, to achieve the effect of improving production efficiency and shortening time

Active Publication Date: 2020-03-24
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the patent CN106674061A, N-methylacetamide is used as the initial raw material, and N-methyltaurine is first prepared by reacting with sulfuric acid, and N-methyltaurine ammonium is prepared by reacting with ammonium source and hydrogen peroxide. Subsequent preparation of sodium N-methyl taurate under a homogeneous catalyst (sodium methoxide, sodium ethoxide, sodium hydroxide, sodium bicarbonate and sodium carbonate, etc.), the process steps are complicated, and the catalyst used is a homogeneous catalyst, there is Catalysts are difficult to recycle
[0005] In the patent CN102675160A, methylamine and sodium isethionate are used as raw materials, and sodium hydroxide or potassium hydroxide is used as a catalyst at 150-300 ° C, and a yield of more than 90% can be obtained, but the catalyst used is a homogeneous catalyst , it is difficult to separate from the product after the reaction, and it is not easy to recycle and apply mechanically

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Dissolve 200g of sodium isethionate in 2300g of water, maintain the temperature in the reactor at 25°C, and add 2g of Zn 5 (CO 3 ) 2 (OH) 6 / Ni 2 ZrO 4 Catalyst (Zn in the catalyst 5 (CO 3 ) 2 (OH) 6 content of 10wt%), mixed evenly, and then slowly passed 20.9g of methylamine into the reactor within 30min. , stop responding. Then the temperature was lowered to 70°C, and the unreacted methylamine in the reaction solution was removed by maintaining the vacuum at 20KPaA. After the removal was completed, sampling analysis showed that the yield of the reaction was 88%, and the selectivity of sodium N-methyl taurate was 98.3%. Then add hydrochloric acid to adjust the pH to around 6.8, after concentration, cooling and crystallization, N-methyl taurine can be obtained, and then react with 14wt% NaOH liquid alkali according to the molar ratio of 1:1 to obtain N-methyl taurine sodium bicarbonate solution. The overall yield is 85%.

[0040] The catalyst can be recover...

Embodiment 2

[0042] Dissolve 200g of sodium isethionate in 800g of water, maintain the temperature in the reactor at 25°C, and add 10g of Zn 5 (CO 3 ) 2 (OH) 6 / Ni 2 ZrO 4 Catalyst (Zn in the catalyst 5 (CO 3 ) 2 (OH) 6 content is 15wt%), mixed evenly, and then slowly passed 83.8g methylamine into the reactor within 30min, after the methylamine was passed through, the temperature of the reaction system was raised to 230°C, and the pressure was maintained at around 8MPa. After the reaction was carried out for 1h, Stop responding. Then the temperature was lowered to 70°C, and the unreacted methylamine in the reaction solution was removed by maintaining the vacuum at 20KPaA. After the removal was completed, sampling and analysis showed that the yield of the reaction was 96%, and the selectivity of sodium N-methyl taurate was 99.4%. Then add hydrochloric acid to adjust the pH to around 6.8, after concentration, cooling and crystallization, N-methyl taurine can be obtained, and then r...

Embodiment 3

[0044] Dissolve 306g of sodium isethionate in 1133g of water, maintain the temperature in the reactor at 25°C, and add 6g of Zn 5 (CO 3 ) 2 (OH) 6 / Ni 2 ZrO 4 Catalyst (Zn in the catalyst 5 (CO 3 ) 2 (OH) 6 content is 12wt%), mixed evenly, and then slowly passed 41.9g methylamine into the reactor within 30min. After the methylamine was passed through, the temperature of the reaction system was raised to 180°C, and the pressure was maintained at around 6MPa. After the reaction was carried out for 2h, Stop responding. Then the temperature was lowered to 70°C, and the unreacted methylamine in the reaction solution was removed by maintaining the vacuum at 20KPaA. After the removal was completed, sampling analysis showed that the yield of the reaction was 98%, and the selectivity of sodium N-methyl taurate was 98.5%. Then add hydrochloric acid to adjust the pH to around 6.8, after concentration, cooling and crystallization, N-methyl taurine can be obtained, and then react...

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PUM

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Abstract

The invention provides a preparation method of N-methyl sodium taurate. Firstly, sodium hydroxyethyl sulfonate is dissolved in water to form a homogeneous system solution. Secondly, methylamine and acatalyst are added into the homogeneous system solution, the reaction system is heated to react, and the catalyst is selected from Zn5 (Co3) 2 (OH) 6, Ni2ZrO4 and Zn5 (Co3) 2 (OH) 6/Ni2ZrO4. Finally,the N-methyltaurine sodium sulfonate is obtained through demethylation, neutralization, crystallization separation and other steps. The yield of the N-methyltaurine sodium sulfonate can reach 85.0-95.0%, and the selectivity is greater than 98%.

Description

technical field [0001] The invention relates to a method for preparing sodium N-methyl taurate. Background technique [0002] Sodium N-methyl taurate is an important derivative product of taurine, which is mainly used in the field of personal care. Sodium N-methyl taurate can be used to synthesize a variety of high value-added personal care products such as sodium cocoyl-N-methyl taurate and sodium polyacryloyl dimethyl taurate. These products are generally Considered a mild surfactant. With the improvement of people's demand for personal care, the market of mild surfactants shows a rapid growth trend. N-methyl taurine sodium series surfactants are one of the important products, and their market is also growing rapidly. increase. [0003] In the synthesis of N-methyl sodium taurate series of mild surfactants, the synthesis of the main raw material N-methyl taurine sodium is the key. So far, many literatures have reported N-methylation methods for the synthesis of amino a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C303/32B01J23/755B01J27/236C07C309/14
CPCC07C303/32B01J27/236B01J23/755C07C309/14
Inventor 桂振友张静钟子太孔令晓张迪任娟郭斌蔺海政陈来中张永振
Owner WANHUA CHEM GRP CO LTD
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