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Preparation method of sodium methyl lauroyl taurate

A technology of sodium methyl lauroyl taurate and sodium methyl taurate, which is applied to the preparation of sulfonates, preparation of organic compounds, chemical instruments and methods, etc., and can solve the problems of sodium chloride residue, complex process, Poor safety and other issues, to achieve the effect of reducing investment, simple process, and convenient operation

Active Publication Date: 2022-03-15
湖北天安日用化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing synthesis process has the following disadvantages: (1) the process is complicated and the operation is cumbersome; (2) the acid chloride has a high risk factor in use and poor safety; (3) sodium hydroxide is used in the synthesis process, and the There is a lot of sodium chloride residue

Method used

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  • Preparation method of sodium methyl lauroyl taurate
  • Preparation method of sodium methyl lauroyl taurate

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preparation example Construction

[0027] Such as figure 1 Shown, the invention provides a kind of preparation method of sodium methyl lauroyl taurate, comprising the steps:

[0028] S1. Add the designed amount of lauric acid into the reaction system, feed nitrogen to replace the air, and heat up until the lauric acid is completely melted.

[0029] S2. Control the temperature of lauric acid in the reaction system at 100-140°C, slowly inject the aqueous sodium methyl taurate solution, evaporate the water in the aqueous sodium methyl taurate solution, and control the injection speed of the aqueous sodium methyl taurate solution to avoid The reaction system produces a large amount of foam and overflows, wherein the molar ratio of lauric acid to sodium methyl taurate is 2.0-3.5:1, and the mass fraction of sodium methyl taurate is 40-60%.

[0030] S3. After the water in the sodium methyl taurate aqueous solution evaporates, the temperature of the reaction system is raised to 230-250° C. for reflux reaction for 4-8 ...

Embodiment 1

[0039] The present embodiment provides a kind of preparation method of sodium methyl lauroyl taurate:

[0040] Add lauric acid into the reaction system, replace the air with nitrogen, and raise the temperature until the lauric acid is completely melted, then control the temperature of lauric acid in the reaction system at 100-140°C, slowly inject an aqueous solution of sodium methyl taurate to evaporate methyl Moisture in the aqueous sodium taurate solution, and control the injection speed of the sodium methyl taurate aqueous solution so as not to overflow the reaction system to produce a large amount of foam, wherein, the mol ratio of lauric acid and sodium methyl taurate is 2:1, methyl The mass fraction of sodium taurate is 60%; after the injection of the aqueous solution of sodium methyl taurate is completed and the water in the aqueous solution of sodium methyl taurate is evaporated, the temperature of the reaction system is raised to 230° C. for reflux reaction for 8 hours...

Embodiment 2

[0044] The present embodiment provides a kind of preparation method of sodium methyl lauroyl taurate:

[0045] Add lauric acid into the reaction system, replace the air with nitrogen, and raise the temperature until the lauric acid is completely melted, then control the temperature of lauric acid in the reaction system at 100-140°C, slowly inject an aqueous solution of sodium methyl taurate to evaporate methyl Moisture in the aqueous sodium taurate solution, and control the injection speed of the sodium methyl taurate aqueous solution so as not to overflow the reaction system to produce a large amount of foam, wherein, the mol ratio of lauric acid and sodium methyl taurate is 2.5:1, methyl The mass fraction of sodium taurate is 55%; after the injection of the aqueous solution of sodium methyl taurate is completed and the water in the aqueous solution of sodium methyl taurate is evaporated, the temperature of the reaction system is raised to 230° C. for reflux reaction for 6 hou...

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Abstract

The invention provides a preparation method of sodium methyl lauroyl taurate, which comprises the following steps: firstly, adding lauric acid into a reaction system, introducing nitrogen to replace air, and heating until the lauric acid is completely molten; the temperature of lauric acid is controlled to be 100-140 DEG C, a sodium methyl taurate aqueous solution is injected according to the molar ratio of lauric acid to sodium methyl taurate being (2.0-3.5): 1, the temperature is increased to 230-250 DEG C, and a reflux reaction is conducted for 4-8 hours; after the reaction is completed, mixing the reacted material with pure water, cooling and carrying out liquid-liquid separation; and concentrating the heavy phase, cooling and crystallizing to obtain a crude product of sodium methyl lauroyl taurate, recrystallizing with pure water, centrifugally separating, and drying to obtain the product. The process is simple and convenient to operate, a catalyst is not used, the reaction is smoothly carried out by controlling the reaction proportion and reaction temperature of lauric acid and sodium methyl taurate, water phase extraction is adopted, no impurity is brought into the whole reaction system, the conversion rate reaches 95% or above, and the product purity can reach 99% or above.

Description

technical field [0001] The invention belongs to the technical field of chemical production, and in particular relates to a preparation method of sodium methyl lauroyl taurate. Background technique [0002] Sodium methyl lauroyl taurate (Galapon LT40) is a safe and non-irritating anionic surfactant. It has mild, moisturizing, clean skin feel, rich and delicate foam, and is effective in weak acid-base, hard water and metal salt solutions. It has good stability, good compatibility, good compatibility with anionic, nonionic and amphoteric surfactants, easy to operate, and synergistic effect on pearl luster; it is mainly used in foam cleanser (surfactant system as the main surface active agent) It has good detergency and emulsifying ability in products such as soap base system as auxiliary surfactant), foam bath liquid, shampoo and other products, and good foam performance, which can give hair and skin a mild, moisturizing and refreshing feeling, and has good Excellent compatibi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C303/32C07C303/44C07C309/15
CPCC07C303/32C07C303/44C07C309/15
Inventor 凌剑王敦志傅俊
Owner 湖北天安日用化工有限公司
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