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A kind of preparation method of sodium n-methyl taurate

A technology of sodium methyl taurate and sodium isethionate is applied in the field of preparation of sodium N-methyl taurine, can solve problems such as harsh process conditions, and achieves that the post-processing process is simple and easy to recycle and reuse. , the effect of low temperature and pressure

Active Publication Date: 2022-02-15
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent CN 102675160A discloses a production method for pipelined continuous production of sodium methyl taurate, which uses alkaline catalysts such as sodium hydroxide or potassium hydroxide to react at high temperature and high pressure, and the production method relies on specific production equipment And the process conditions are harsh

Method used

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  • A kind of preparation method of sodium n-methyl taurate
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preparation example Construction

[0033] The source of the reagent raw material used in the preparation example of the present invention, embodiment and comparative example is as follows:

[0034] ZrO(NO 3 ) 2 , (NH 4 ) 2 WO 4 , Anhydrous methylamine was purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.; molecular sieve catalyst HY-30 was purchased from Nankai Catalyst Factory; sodium isethionate was purchased from Sigma-Aldrich; methylamine was purchased from Kedi Chemical Technology Co., Ltd.; Ionic liquids were purchased from Lanzhou Institute of Chemical Physics; aqueous nitric acid solution (30wt%) was purchased from Sinopharm Reagent Co., Ltd.

[0035] Other reagent raw materials are commercially available unless otherwise specified.

[0036] Sodium isethionate and sodium N-methyltaurate were analyzed by derivatization method using liquid chromatography equipped with UV detector. The liquid chromatography is Agilent's 1200 series, equipped with a C18 liquid chromatography column, the...

Embodiment 1

[0041] use as figure 2 The preparation system shown.

[0042] In the reactor, 200g sodium isethionate was dissolved in 1147g [C 6 min][NTf 2 ] in the ionic liquid, then in the reaction system, add the HY-30 catalyst of Zr and W modification of 2g (in terms of metal content, the Zr / W quality accounts for 0.5% of the total mass of the catalyst, and the mol ratio of Zr / W is 1 : 1.5), stir evenly, then add 653g methylamine to the reaction system, after the reactor is airtight, heat up to 200°C, the pressure of the reaction system is controlled at 6.1MPa, the reaction time is 1h, the gas evaporated in the reaction process is reduced The pressure valve decompresses to 5 bar and enters the rectification tower for rectification and separation. The water produced by the reaction is separated from the bottom of the tower, and methylamine is recovered from the top of the tower, which is then applied to the reactor again.

[0043] After the reaction, the temperature of the reaction li...

Embodiment 2

[0049] use as figure 2 The preparation system shown.

[0050] In the reactor, 330g sodium isethionate was dissolved in 1151g [C 6 min][NTf 2 ] in the ionic liquid, then add 16.5g of Zr and W modified HY-30 catalyst (in terms of metal content, the Zr / W quality accounts for 0.8% of the total catalyst mass, and the mol ratio of Zr / W is 1.2:1), stir evenly, then add 718g methylamine to the reaction system, after the reactor is sealed, heat up to 160°C, the pressure of the reaction system is controlled at 5MPa, the reaction time is 1.5h, the gas evaporated during the reaction passes through The pressure reducing valve reduces the pressure to 4 bar and enters the rectification tower for rectification and separation. The water produced by the reaction is separated from the bottom of the tower, and methylamine is recovered from the top of the tower, which is then applied to the reactor again.

[0051] After the reaction is finished, the temperature of the reaction liquid is lowere...

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Abstract

The invention provides a preparation method of sodium N-methyl taurate, which is prepared by reacting sodium isethionate and methylamine in the presence of a catalyst with ionic liquid as the reaction medium, wherein the catalyst is Zr and W-modified HY molecular sieves. The preparation method of sodium N-methyl taurate provided by the invention can greatly improve the yield and selectivity of sodium N-methyl taurate, catalyst and ionic liquid are all easy to recycle and reuse, and the cost is low, and the temperature in the reaction process And pressure is lower, and process condition is milder, and reaction time obviously shortens, and aftertreatment process is easy, and therefore, the preparation method of sodium N-methyl taurate provided by the invention is particularly suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to the field of preparation of chemical intermediates, in particular to a preparation method of sodium N-methyl taurate. Background technique [0002] Sodium N-methyl taurate, also known as sodium methyl taurate, is an important derivative of taurine, which can be used as daily chemicals and pharmaceutical intermediates. 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 Sodium acrylate, hydroxyethyl acrylate / sodium acryloyldimethyl taurate copolymer and other high value-added products, these products are generally used as mild surfactants due to their mild properties. With the increasing demand for personal care, the market of mild surfactants shows a rapid growth trend, and the importance of N-methyl taurine sodium series surfactants is also becoming more and more prominent. [0003] In the synthesi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C303/32C07C309/14B01J29/16
CPCC07C303/32B01J29/166B01J2229/186C07C309/14
Inventor 桂振友张静钟子太孔令晓任娟郭斌蔺海政陈来中张永振
Owner WANHUA CHEM GRP CO LTD
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