Method for preparing quaternary ammonium salt

A technology of quaternary ammonium salt and alkylation reagent, which is applied in the field of preparation of quaternary ammonium salt, can solve the problems of waste of resources, high cost, no research on reaction parameters of alkyl tertiary amine, etc., and achieves the effect of reducing material consumption and manufacturing cost

Inactive Publication Date: 2007-10-10
浙江华特新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its existing main defect is: 1) use the polar media such as ethanol, isopropanol as reaction cosolvent cost height
2) Using polar media such as ethanol and isopropanol as a reaction co-solvent causes waste of resources
3) Polar media such as ethanol and isopropanol are used as reaction co-solvents, which will cause environmental pollution after volatilization of ethanol and isopropanol
The above-mentioned publications only relate to the preparation of tertiary ammonium salts by unsaturated tertiary amines, but do not involve the preparation of quaternary ammonium salts in water by alkyl tertiary amines, and there is no further research on alkyl tertiary amines, alkylating reagents and reaction parameters.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Put 29 grams of octadecyl tertiary amine (octadecyl dimethyl tertiary amine), 5.1 grams of methyl chloride, and 102 grams of water into the reactor, and react at 75°C for 3 hours to obtain an aqueous solution of quaternary ammonium salt, wherein the active substance content is 24.8 %, the reaction raw material conversion rate is 99.48%.

Embodiment 2

[0023] Put 21.3 grams of dodecyl tertiary amine (dodecyl dimethyl tertiary amine), 5.1 grams of methyl chloride, and 62 grams of water into the reactor, and react at 45°C for 5 hours to obtain an aqueous solution of quaternary ammonium salt, wherein the active substance content is 29.7 %, the reaction raw material conversion rate is 99.67%.

Embodiment 3

[0027] Put 21.3 grams of dodecyl tertiary amine (dodecyl dimethyl tertiary amine), 12.7 grams of benzyl chloride, and 63 grams of water into the reactor, and react at 60°C for 3.5 hours to obtain a quaternary ammonium salt solution. It is 34.8%, and the reaction raw material conversion rate is 99.47%.

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Abstract

This invention relates to a method for preparing quaternary ammonium salt. The method comprises: reacting C12-C18 alkyl dimethyl tertiary amine and alkylation reagent at 50-105 deg.C in water to obtain the product. The alkylation reagent is C1-C8 halogenated hydrocarbon. The method has the same effect as conventional method performed in low-carbon alcohol, and has such advantages as low cost and reduced environmental pollution of the solvent.

Description

(1) Technical field [0001] The invention relates to a preparation method of quaternary ammonium salt. (2) Background technology [0002] Quaternary ammonium salt-type cationic surfactants have many excellent properties, and can be used as antistatic agents, softeners, dye retarders, color fixing agents, etc. for fibers, and can also be used as bactericidal disinfectants and hair conditioners for hair cosmetics, etc. in various industries. The quaternary ammonium salt type cationic surfactant has strong alkalinity, does not produce free amine in alkaline solution, and has stable properties. [0003] From a structural point of view, quaternary ammonium salts are formed by replacing four hydrogen atoms on ammonium salts with organic groups, and are usually prepared by reacting tertiary amines with alkylating agents. The alkylating reagents include: alkyl halides such as methyl chloride and benzyl chloride, dialkyl sulfates such as dimethyl sulfate, epoxides such as ethylene o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C209/00C07C211/62
Inventor 汪平华邱永前王建风陈晓明
Owner 浙江华特新材料有限公司
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