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Preparation method of sodium taurate

A technology of sodium taurine and sodium isethionate, which is applied to the preparation of sulfonic acid, sulfonate, and organic compounds, and can solve problems such as difficult separation, difficult online separation, and large ammonia usage. Achieve the effects of reducing dosage, increasing yield and improving conversion rate

Active Publication Date: 2020-05-08
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Based on the complexity of the ammonolysis reaction process, the current sodium taurate preparation process has low conversion rate of sodium isethionate, low sodium taurate yield, large ammonia usage, by-product sodium ditaurate and Disadvantages such as high sodium tritaurate content and difficulty in separation
[0006] Usually, the way to break the reversible equilibrium reaction is to remove the by-products from the reaction system in time, and for figure 1 The ammonolysis reaction described in is difficult to realize. The main difficulties are: 1) The boiling point of the by-product water is 100°C, which is much higher than that of the raw material ammonia. The ammonolysis reaction can't be carried out; 2) by-product two sodium taurate and tri-sodium taurate are very similar to the properties of product sodium taurate, it is difficult to separate online in the reaction process

Method used

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  • Preparation method of sodium taurate
  • Preparation method of sodium taurate
  • Preparation method of sodium taurate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The preparation of embodiment 1 sodium taurate

[0050] The structural formula of the ionic liquid used in this embodiment is:

[0051]

[0052] In a 0.5L reactor, add 100g of the above-mentioned ionic liquid, then add 50g of sodium taurate and 55g of sodium isethionate, raise the temperature to 60°C, control the pressure of the reaction system to 2Kpa, keep stirring for 2 hours, and then naturally cool down to room temperature. The ionic liquid solution of sodium ditaurate / sodium tritaurate is obtained.

[0053] Chromatographic analysis shows that the mass ratio of sodium isethionate, (sodium ditaurate+sodium tritaurate) is 0.09:99.8, that is, the quality of unreacted sodium isethionate is product ditaurine 0.09% of the total mass of sodium and sodium tritaurate.

[0054] Water Content Analysis Test The water content in the ionic liquid solution was 0.03%.

[0055] Mass spectrometry results:

[0056] Sodium Ditaurate HRMS(ESI)m / z[M] 2- :[C 2 h 9 NO 6 S 2 ] ...

Embodiment 2

[0061] The preparation of embodiment 2 sodium taurine

[0062] The structural formula of the ionic liquid used in this embodiment is:

[0063]

[0064] In a 1L reaction kettle, add 200g of the above-mentioned ionic liquid, then add 50g of sodium taurate and 75g of sodium isethionate, raise the temperature to 180°C, control the pressure of the reaction system to 5Kpa, keep stirring for 2 hours, and naturally cool down to room temperature to obtain Ionic liquid solution of sodium ditaurate / sodium tritaurate.

[0065] Chromatographic analysis shows that the mass ratio of sodium isethionate, (sodium ditaurate+sodium tritaurate) is 0.08:99.91, that is, the quality of unreacted sodium isethionate is product ditaurine 0.08% of the total mass of sodium and sodium tritaurate.

[0066] Water Content Analysis Test The water content in the ionic liquid solution was 0.02%.

[0067] Pass into 23g liquid ammonia in the ionic liquid solution (wherein, the total mass of di-sodium taurate...

Embodiment 3

[0069]The preparation of embodiment 3 sodium taurine

[0070] The structural formula of the ionic liquid used in this embodiment is:

[0071]

[0072] In a 1L reaction kettle, add 250g of the above-mentioned ionic liquid, then add 50g of sodium taurate and 90g of sodium isethionate, raise the temperature to 220°C, control the pressure of the reaction system to 5Kpa, keep stirring for 4 hours, and naturally cool down to room temperature to obtain Ionic liquid solution of sodium ditaurate / sodium tritaurate.

[0073] Chromatographic analysis shows that the mass ratio of sodium isethionate, (sodium ditaurate+sodium tritaurate) is 0.05:99.92, that is, the quality of unreacted sodium isethionate is product ditaurine 0.05% of the total mass of sodium and sodium tritaurate.

[0074] Water Content Analysis Test The water content in the ionic liquid solution was 0.02%.

[0075] Pass into 17.5g liquefied ammonia in the ionic liquid solution (wherein, the total mass of di-sodium tau...

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Abstract

The invention provides a preparation method of sodium taurate. The preparation method comprises the following steps: dissolving sodium hydroxyethyl sulfonate and a raw material sodium taurate into a guanidyl-containing ionic liquid, performing a reaction to obtain an ionic liquid solution containing a mixed product of sodium ditaurate and sodium tritaurate, introducing liquid ammonia into the ionic liquid solution of the mixed product, performing a reaction to obtain an ionic liquid solution of the product sodium taurate, adding the ionic liquid solution of the product sodium taurate into an alcohol solvent for solvating out, and separating out the obtained precipitated solid to obtain the product sodium taurate. The sodium taurate preparation method is high in product yield, good in purity, high in raw material utilization rate, simple and convenient in process and mild in reaction condition, the production efficiency of sodium taurate can be greatly improved, and the production costis reduced, so that the sodium taurate preparation method has a very good industrial application prospect.

Description

technical field [0001] The invention relates to the field of preparation of chemical intermediates, in particular to a preparation method of sodium taurine. Background technique [0002] Taurine, also known as 2-aminoethanesulfonic acid, is one of the important nutrients for humans and animals. It has important physiological functions, and also has anti-inflammatory, antipyretic, analgesic, anti-viral and other effects, so it is widely used In functional beverages, food, feed, medicine and other fields. [0003] The preparation methods of taurine are divided into natural extraction method and chemical synthesis method, among which the chemical synthesis method accounts for more than 95% of the total production capacity. The reported chemical synthesis methods include the nitromethane method (as disclosed in CN 103613517A), the ethanolamine method (as disclosed in CN 105152985A) and the ethylene oxide method (as disclosed in CN 101486669A). Due to the high price of raw mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C303/44C07C303/22C07C303/32C07C309/14
CPCC07C303/44C07C303/22C07C303/32C07C309/14
Inventor 陈来中钟子太张静桂振友张永振黎源丰茂英王文
Owner WANHUA CHEM GRP CO LTD
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