Rapid synthesis method for lauroyl-sodium methyl taurate

A technology of sodium lauroyl methyl taurate and sodium methyl taurate, which can be used in the preparation of sulfonates, chemical instruments and methods, preparation of organic compounds, etc., and can solve product loss, environmental pollution, and difficulty in sodium salts. Recycling and other issues to achieve the effect of reducing the reaction time and improving the conversion rate

Inactive Publication Date: 2015-12-23
湖州新天字味精有限公司
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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 am

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A kind of rapid synthetic method of sodium lauroyl methyl taurate:

[0021] Mix lauric acid, boric acid, acetic acid, and liquid paraffin, replace the air with nitrogen, and stir and mix for 10 minutes after heating up to 100°C;

[0022] After heating up, slowly add 46% 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 Down reaction 110 minutes;

[0023] After the reaction is completed, stop heating, and when the material temperature is lower than 130°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 ...

Embodiment 2

[0027] A kind of rapid synthetic method of sodium lauroyl methyl taurate:

[0028] Mix lauric acid, boric acid, acetic acid, and liquid paraffin, replace the air with nitrogen, and stir and mix for 10 minutes after raising the temperature to 110°C;

[0029] After heating up, slowly add 48% 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 Down reaction 150 minutes;

[0030] After the reaction is completed, stop heating, and when the material temperature is lower than 130°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...

Embodiment 3

[0034] A kind of rapid synthetic method of sodium lauroyl methyl taurate:

[0035] Mix lauric acid, boric acid, acetic acid, and liquid paraffin, replace the air with nitrogen, and stir and mix for 10 minutes after heating up to 105°C;

[0036] After heating up, slowly add 47% 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, after dripping the N-methyl sodium taurate aqueous solution, continue to heat up to 225°C Down reaction 135 minutes;

[0037] After the reaction is completed, stop heating, and when the material temperature is lower than 130°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...

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PUM

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Abstract

The invention discloses a rapid synthesis method for lauroyl-sodium methyl taurate. The rapid synthesis method comprises the following steps: mixing lauric acid with boric acid, acetic acid and liquid paraffin; introducing nitrogen to replace air, heating to 100 DEG C to 110 DEG C and mixing for 10min; after heating, slowly dropwise adding N-sodium methyl taurate aqueous solution of which the mass fraction is 46 percent to 48 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 110 to 150 minutes; stop heating after the reaction is ended, injecting water and cyclohexane in sequence after material temperature is lower than 130 DEG C to dissolve feed liquid, standing for layering, and then, recrystallizing and filtering aqueous solution on the lower layer, and then, recrystallizing and filtering a filter cake with ethyl alcohol and vacuum drying to obtain the lauroyl-sodium methyl taurate; after the cyclohexane is evaporated from an upper oil layer, a paraffin layer is recycled.

Description

technical field [0001] The invention relates to a rapid synthesis method of 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...

Claims

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Application Information

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IPC IPC(8): C07C309/15C07C303/32C07C303/44
Inventor 邱峰峰
Owner 湖州新天字味精有限公司
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