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Method for preparing N-sodium methyl taurate

A technology of sodium methyl taurate and sodium isethionate, applied in the direction of sulfonate preparation, chemical instruments and methods, metal/metal oxide/metal hydroxide catalyst, etc., can solve the problem of low conversion rate, High cost, limited sources of raw materials, etc., to achieve high selectivity, reduce industrialization costs, and improve raw material utilization

Pending Publication Date: 2021-12-17
WANHUA CHEM GRP CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] CN106674061 discloses the preparation of N-methyl sodium taurate with N-methyl acetamide and concentrated sulfuric acid reaction, although the reaction conditions are improved compared with the common method at this stage, there are still limited sources of raw materials, high cost, low conversion rate, etc. question

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  • Method for preparing N-sodium methyl taurate

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Experimental program
Comparison scheme
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Embodiment 1

[0031] Preparation of Catalyst A:

[0032] Dissolve 10.0g of ammonium metavanadate in 50ml of 4.5wt% oxalic acid solution, stir until dissolved; then add 3.0g of TiO 2 Powder, stir well, stand at room temperature for 24 hours, filter under reduced pressure, wash the filter cake with 20ml deionized water for 3 times, dry in an oven at 90°C for 12 hours, then place in a muffle furnace at a heating rate of 3°C / min Raise from room temperature to 280°C, keep the temperature constant for 3 hours, then reach 550°C at a rate of 3°C / min, keep the temperature constant for 4 hours, take it out after cooling, grind and sieve the (80-120) mesh part to get V 2 o 5 / TiO 2 Powder.

[0033] Dissolve 15.0g of ammonium tungstate in 50ml of 4.5wt% oxalic acid solution, stir until dissolved; then add 3.0g of V 2 o 5 / TiO 2 Powder, stir well, stand at room temperature for 24 hours, filter under reduced pressure, wash the filter cake with 20ml deionized water for 3 times, dry in an oven at 90°...

Embodiment 2

[0040] Add 486.6g of 30.4wt% sodium isethionate solution into the reactor, add 0.75g of catalyst A, replace with N2, add 34.1g of methylamine to the system, control the temperature at 35°C, and fill the system with N2, The pressure in the system was controlled at 0.2MpaG, and the temperature was lowered after 150min of heat preservation reaction to take a sample. The mass of sodium N-methyl taurate was detected by LC to be 152.9g. The conversion rate of this reaction was 96.7%, and the selectivity was 98.2%.

[0041] 1H NMR (400MHz, D2O) δ3.55(t, J=7.1Hz, 2H), 3.24(s, 3H), 3.13(t, J=7.1Hz, 2H).

Embodiment 3

[0043] Add 378.3g of 46.99wt% sodium isethionate solution into the reactor, add 1.778g of catalyst A, replace with N2, add 123.0g of methylamine to the system, control the temperature at 35°C, and fill the system with N2, The pressure in the system was controlled at 7.8MpaG, and the temperature was lowered to take samples after the heat preservation reaction was performed for 285 minutes.

[0044] The mass of sodium N-methyl taurate detected by LC was 118.1 g. The conversion rate of this reaction was 73.2%, and the selectivity was 83.4%.

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Abstract

The invention relates to a method for preparing N-sodium methyl taurate. According to the method, N-sodium methyl taurate is synthesized from methylamine and sodium isethionate as raw materials in water as a solvent under the action of a catalyst V2O5-WO3 / TiO2. The method for preparing N-sodium methyl taurate provided by the invention is high in atom utilization rate, high in selectivity, mild in reaction condition, easy to operate and good in controllability, and is a green and environment-friendly preparation method.

Description

technical field [0001] The invention relates to a method for preparing sodium N-methyl taurate, which belongs to the field of fine chemical industry. [0002] technical background [0003] Sodium N-methyl taurate, also known as sodium methyl taurate, is an important derivative of taurine and can be used as a daily chemical and pharmaceutical intermediate. In the field of daily chemicals, it can be used to synthesize sodium cocoyl-N-methyl taurate, sodium polyacryloyl dimethyl taurate, polydimethylsiloxane PEG-7 acetyl methyl taurine A variety of high value-added products such as sodium acrylate and sodium hydroxyethyl acrylate / sodium acryloyldimethyl taurate copolymer, these products are generally considered mild surfactants due to their mild properties, as people The demand for leather in personal care is increasing day by day, and the mild surfactant market is showing a rapid growth trend. N-methyl taurine sodium series surfactants are some of the important products. [0...

Claims

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Application Information

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IPC IPC(8): C07C303/32C07C309/14B01J23/30
CPCC07C303/32B01J23/30B01J23/002B01J2523/00B01J2523/47B01J2523/55B01J2523/69C07C309/14
Inventor 郭斌刘杰桂振友张静蔺海政刘照任娟
Owner WANHUA CHEM GRP CO LTD
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