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Preparation method for sodium fatty acyl methyl taurate

A technology of sodium fatty acyl methyl taurate and sodium methyl taurate, which is applied in the preparation of high-purity sodium fatty acyl methyl taurate and the field of preparation of fatty acyl amino acid type anionic surfactants, can solve many problems Difficult to acidify stratification, large salty wastewater, large equipment investment and other problems, to achieve the effect of reducing crystal solubility, advanced and reasonable technology, and high economic benefits

Inactive Publication Date: 2017-04-26
ZHANGJIAGANG GREAT CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this process is that the energy consumption is high, the equipment investment is large, and the production cost is high; liquid paraffin needs to be used in the reaction, even if it is recycled, there will be a large loss; product loss
But this method also has the problem of using organic solvents, and it will also produce a large amount of saline wastewater, and the environmental pressure is high. In addition, sodium fatty acyl methyl taurate has good solubility in acidic environment, and it is difficult to carry out acidification and stratification.

Method used

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  • Preparation method for sodium fatty acyl methyl taurate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Under room temperature, 1110kg of N-methyl taurine sodium solution (40%) is pumped into the reactor, stirred and mixed for 30min, added 1110kg of reclaimed filtrate, continued to stir and mixed for 30min; 218) into the high level tank respectively, and feed nitrogen gas of 0.02-0.05MPa for nitrogen blanketing; adjust the pH of the system at 12, and the temperature ≤ 40°C; start to drop acid chloride and liquid caustic soda at the same time, and control the pH at 9-11 during the dropping process. When the temperature is ≤65°C, the dropping time is controlled within 2 hours; after the dropping is completed, the temperature is raised to 70°C, and the temperature is kept and aged for 4 hours;

[0028] Under stirring at 60RPM, vacuum pump 1250kg of recovered filtrate at 0°C, and drop the temperature to 50°C; at the same time, reduce the stirring to 15RPM, and control the cooling rate at 10 minutes / 1°C through refrigerated circulating water, and slowly cool down to 5°C , free...

Embodiment 2

[0032]Under room temperature, N-methyl taurine sodium solution (40%) 1200kg is sucked into reactor, stirs and mixes 30min, adds 300kg and reclaims filtrate, continues to stir and mix 30min; =218) into the head tank respectively, and nitrogen gas 0.02-0.05MPa was introduced to carry out nitrogen blanketing; adjust the pH of the system at 12, the temperature ≤ 40°C; start to add acid chloride and liquid caustic soda at the same time, and control the pH at 9-11 during the dropping process , the temperature is ≤65°C, and the dropping time is controlled at 6 hours; after the dropping is completed, the temperature is raised to 65°C, and the aging is kept for 2 hours;

[0033] Under 50RPM stirring, vacuum pump 2480kg of recovered filtrate at 0°C, and the temperature will drop to 30°C; at the same time, reduce the stirring to 5RPM, and control the cooling rate at 5 minutes / 1°C through refrigerated circulating water, and slowly cool down to 0°C , frozen and crystallized for 25 hours; ...

Embodiment 3

[0037] At room temperature, 1200 kg of N-methyl taurine sodium solution (40%) is sucked into the reactor, stirred and mixed for 30 min, added 1500 kg of reclaimed filtrate, continued to stir and mixed for 30 min; = 246.82) respectively into the high level tank, and nitrogen gas 0.02 ~ 0.05MPa was introduced to carry out nitrogen blanketing; adjust the pH of the system at 12, and the temperature ≤ 40 ° C; start to drop acid chloride and liquid caustic soda at the same time, and control the pH at 9 ~ 11 during the dropping process , the temperature is ≤65°C, and the dropping time is controlled at 6 hours; after the dropping is completed, the temperature is raised to 85°C, and the temperature is kept and aged for 3 hours;

[0038] Under 70RPM stirring, vacuum pump 1500kg of recovered filtrate at 0°C, and the temperature in the kettle will drop to 50°C; at the same time, reduce the stirring to 20RPM, and control the cooling rate at 5 minutes / 1°C through refrigerated circulating wat...

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Abstract

The invention discloses a preparation method for sodium fatty acyl methyl taurate. According to the method, an organic solvent is not used for performing crystallization and re-crystallization, and a byproduct-centrifugal filter liquor in a reaction process is recycled, so that the environment and health problems caused by use of the solvent and the environmental protection problem of salt-containing and acid-containing wastewater discharge in a purification process in the past are solved. A frozen recovered filter liquor is added in a freezing crystallization process, so that the temperature is reduced; and sodium chloride in the filter liquor is used for performing seeding, and the effects of crystal seeds and crystal nucleuses are achieved, so that the graining in the process is quick, wrapped impurities due to non-crystal agglomeration are reduced, and the prepared product is higher in purity and higher in content. The freezing crystallization is combined with the freezing centrifugation, so that the crystal solubility is reduced and the product yield is increased. Through optimized selection of a process route, the process is advanced and rational, can be realized by using a general device, and is simple in operation, relatively high in economic benefit and relatively low in environmental pollution.

Description

technical field [0001] The present invention relates to the preparation method of fatty acyl amino acid type anionic surfactant. Specifically, the invention relates to a preparation method of high-purity sodium fatty acyl methyl taurate, which belongs to the technical field of surfactant synthesis. Background technique [0002] Sodium fatty acyl methyl taurate is a typical long-chain acyl amino acid surfactant, which has good compatibility with anionic, cationic and nonionic surfactants, and has excellent water solubility, hard water resistance and biodegradation It is a mild, low-toxic, safe and effective anionic surfactant. At present, this type of surfactant is mainly prepared by the Schotton-Bowman condensation method in the industry, that is, using fatty acid chloride sodium N-methyl taurate It is condensed under alkaline conditions. [0003] Zeng Ping, Chen Lan, Xie Weiyue, et al. Synthesis and Properties of Sodium Cocoyl Methyl Taurate [J], Commodity Chemistry, "Sci...

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 徐由江朱红军郭静波陆菲菲张海平朱志乾崔宜斌盛绕
Owner ZHANGJIAGANG GREAT CHEM
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