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Synthesis method for lauroyl-sodium methyl taurate

A technology of sodium lauroyl methyl taurate and sodium methyl taurate, which is applied to the preparation of sulfonate, chemical instruments and methods, and the preparation of organic compounds, and can solve product loss, environmental pollution, and sodium salt Recycling and other issues to achieve the effect of reducing reaction time and improving conversion rate

Active Publication Date: 2015-12-23
JIANGYIN HUACHANG FOOD ADDITIVE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process is easy to cause environmental pollution in the process of preparing lauroyl chloride, and at the same time, a large amount of sodium salt is difficult to recycle, which will cause product loss in the process of multiple recrystallization purification

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A kind of synthetic method of sodium lauroyl methyl taurate:

[0017] Mix lauric acid, MgO, and acetic acid liquid paraffin, replace the air with nitrogen, and stir and mix for 5 minutes after heating up to 100°C;

[0018] After heating up, slowly add 45% mass fraction of N-methyl sodium taurate aqueous solution dropwise, control the dropping speed to prevent the reaction system from overflowing with a large amount of foam, continue to heat up to 220°C after dripping the N-methyl sodium taurate aqueous solution Lower reaction 4h;

[0019] After the reaction is completed, stop heating, and when the material temperature is lower than 150°C, sequentially inject water and cyclohexane to dissolve the material liquid, and after standing for stratification, recrystallize and filter the lower aqueous solution, recrystallize and filter the filter cake with ethanol, and then vacuum dry to obtain the product; After the cyclohexane is evaporated from the upper oil layer, the paraf...

Embodiment 2

[0023] A kind of synthetic method of sodium lauroyl methyl taurate:

[0024] Mix lauric acid, MgO, and acetic acid liquid paraffin, replace the air with nitrogen, and stir and mix for 5 minutes after heating up to 110°C;

[0025] After heating up, slowly add 42% mass fraction of N-methyl taurate aqueous solution dropwise, control the dropping speed to prevent the reaction system from overflowing with a large amount of foam, continue to heat up to 226°C after dripping the N-methyl sodium taurate aqueous solution Under reaction 4.5h;

[0026] After the reaction is completed, stop heating, and when the material temperature is lower than 150°C, sequentially inject water and cyclohexane to dissolve the material liquid, and after standing for stratification, recrystallize and filter the lower aqueous solution, recrystallize and filter the filter cake with ethanol, and then vacuum dry to obtain the product; After the cyclohexane is evaporated from the upper oil layer, the paraffin l...

Embodiment 3

[0030] A kind of synthetic method of sodium lauroyl methyl taurate:

[0031] Mix lauric acid, MgO, and acetic acid liquid paraffin, replace the air with nitrogen, and stir and mix for 5 minutes after heating up to 105°C;

[0032] After heating up, slowly add 44% mass fraction of N-methyl sodium taurate aqueous solution dropwise, control the dropping speed to prevent the reaction system from overflowing with a large amount of foam, continue to heat up to 221°C after dripping the N-methyl sodium taurate aqueous solution Lower reaction 4h;

[0033] After the reaction is completed, stop heating, and when the material temperature is lower than 150°C, sequentially inject water and cyclohexane to dissolve the material liquid, and after standing for stratification, recrystallize and filter the lower aqueous solution, recrystallize and filter the filter cake with ethanol, and then vacuum dry to obtain the product; After the cyclohexane is evaporated from the upper oil layer, the paraf...

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Abstract

The invention discloses a high-conversion rate synthesis method for lauroyl-sodium methyl taurate. The high-conversion rate synthesis method comprises the following steps: mixing lauric acid with MgO, acetic acid and liquid paraffin; introducing nitrogen to replace air, heating to 100 DEG C to 110 DEG C and mixing for 5min; after heating, slowly dropwise adding N-sodium methyl taurate aqueous solution of which the mass fraction is 42 percent to 45 percent, controlling dropping speed so as to avoid the phenomenon that a large number of foams are generated from a reaction system and overflow, and continue to heat to 220 to 226 DEG C after the N-sodium methyl taurate aqueous solution is dropwise added and reacting for 4 to 5h; stop heating after the reaction is ended, and recovering. The high-conversion rate synthesis method disclosed by the invention is simple in process and easy in operation; the reaction time can be shortened, and the conversion rate (higher than 98 percent) of N-sodium methyl taurate is improved; after a crude product is recrystallized and dried, the purity of the crude product can reach more than 99 percent.

Description

technical field [0001] The invention relates to a method for synthesizing sodium lauroyl methyl taurate, which belongs to the field of chemical production. Background technique [0002] Sodium lauroyl methyl taurate is a kind of N-acyl amino acid surfactant, its molecule contains sulfonic acid group combined with amide group, it has good compatibility with anionic, nonionic and zwitterionic surfactants It is an anionic surfactant with high safety, which has excellent water solubility, hard water resistance, alkali resistance and acid resistance. At present, the industry mainly uses the Schotton-Bowman condensation method to prepare sodium lauroyl methyl taurate [4-5]. The conversion rate of N-methyl taurine sodium is generally about 90%, and the product purity is about 95%. This process is easy to cause environmental pollution in the process of preparing lauroyl chloride, and at the same time, a large amount of sodium salt is difficult to recycle, and product loss will be c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C309/15C07C303/32C07C303/44
Inventor 邱峰峰
Owner JIANGYIN HUACHANG FOOD ADDITIVE CO LTD
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