Synthesis of high-purity N-acyl-N-methyl sodium sulfate

A technology of sodium methyl taurate and a synthetic method, which is applied in the field of surfactant synthesis, can solve the problems of organic solvent consumption, high cost, troublesome operation, etc., and achieve the effect of high product purity and low saponified impurity fatty acid sodium

Active Publication Date: 2005-10-12
SHANGHAI OLI ENTERPRISES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The water content in the system needs to be below 5%, consumes a large amount of organic solvents, and uses

Method used

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  • Synthesis of high-purity N-acyl-N-methyl sodium sulfate

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Experimental program
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Embodiment 1

[0019] In a 500ml four-necked flask, add 139.6g (0.22 mol) of an aqueous solution of N-methyl taurine with a concentration of 25.73%, add 80ml of acetone, stir evenly, cool to 15°C ± 2°C, slowly and uniformly drop in laurel 44 g (0.2 mol) of acid chloride, at the same time, drop into 50% aqueous sodium hydroxide solution, carefully control the pH of the reaction solution between 9 and 10, and finish dropping in about 2 hours. Continue to keep the pH between 9 and 10 at 20°C to 30°C for 2 to 3 hours (until the pH remains unchanged). The obtained white paste reactant was placed in the refrigerator overnight, filtered to dryness, treated with 50% acetone aqueous solution, and dried at 60 °C to obtain 59.53 g of white powdery sodium N-lauroyl-N-methyl taurate crystals in a yield of 59.53 g. 86.65%.

[0020] Analysis: Actives 95.32% Sodium Laurate 1.56%

[0021] Sodium chloride 1.99% Weight loss 0.32%

[0022] I.R(cm -1 )3452 2920 2851 1640

[0023] ...

Embodiment 2

[0025] In a 500ml four-necked flask, add 139.6g (0.22 mol) of an aqueous solution of N-methyl taurine with a concentration of 25.73%, add 80ml of ethanol, stir and mix, cool to 16°C, and dropwise slowly and uniformly within 2 hours 48.6 grams (0.2 moles) of lauroyl chloride, at the same time, drop in 50% aqueous sodium hydroxide solution, control the pH of the reaction solution to be between 9 and 10, drop it in about 2 hours, and then react at about 20 ° C for 3 hours, ( Keep pH 9~10), put in refrigerator overnight, filter, wash with 50% ethanol, and dry to obtain 56.65 g of white N-lauroyl-N-methyl taurate sodium crystals, with a yield of 82.4%.

[0026] Analysis: Actives 93.01% Sodium Laurate 0.73%

[0027] Sodium chloride 1.35% Weight loss 1.54%

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Abstract

Synthesis of high-purity N-acyl-N-methyl-sodium taurine is carried out by reacting N-acyl-N-methyl-sodium taurine with fatty acyl chloride under inorganic base condition in water and hydrophilic mixed dissolving medium. It achieves convenient operation and industrial production.

Description

technical field [0001] The invention relates to a method for synthesizing a surfactant, in particular to a method for synthesizing high-purity sodium N-acyl-N-methyl taurate. Background technique [0002] Sodium N-acyl-N-methyl taurate has been used as a surfactant for a long time. It is widely used in cosmetics because of its good detergency on hair, good softness and little irritation to the skin. [0003] Industrially available higher fatty acids and their anhydrides, esters or acid chlorides, and N-methyl taurine sodium acylation derived. The commonly used method is the Schott-Baumann method, which is obtained by acylating fatty acid chlorides with sodium N-methyl taurine in an alkaline aqueous solution. The product obtained as (Public Patents: Hei 4-154756, Hei 2-218657) is a "paste-like" aqueous solution. The purity is not high and there are many impurities, so special methods are required to purify. (Hei 4-149169, Zhao 62-63555) is quite inconvenient, and a high-p...

Claims

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Application Information

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IPC IPC(8): C07C303/22C07C309/15
Inventor 初白江志洁黄骁
Owner SHANGHAI OLI ENTERPRISES CO LTD
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