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Process for preparing hexadecyl methyl 2-hydroxyethyl ammonium bromide

A technology of cetyl methyl dihydroxyethyl ammonium bromide and methyl diethanolamine, which is applied in the preparation of amino hydroxy compounds, the preparation of organic compounds, chemical instruments and methods, etc., can solve the problem of harmful recovery of organic solvents, Difficulties and other problems to achieve good solubilization performance, reduce pollution and the cost of recovery

Inactive Publication Date: 2013-11-06
RIFENG ENTERPRISE GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Hexadecylmethyldihydroxyethylammonium bromide is an important cationic surfactant. The existing preparation methods all react with the participation of solvents. Most of the organic solvents are harmful to the human body and difficult to recycle.

Method used

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  • Process for preparing hexadecyl methyl 2-hydroxyethyl ammonium bromide
  • Process for preparing hexadecyl methyl 2-hydroxyethyl ammonium bromide
  • Process for preparing hexadecyl methyl 2-hydroxyethyl ammonium bromide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Weigh N-methyldiethanolamine and bromohexadecane into a three-necked flask equipped with a mechanical stirrer, reflux condenser, and thermometer. The molar ratio of bromohexadecane and N-methyldiethanolamine is 1.1: 1. The reaction temperature is 110°C under heating in an oil bath. After reacting for 110 minutes, the crude product was recrystallized three times with a mixture of ethyl acetate and absolute ethanol, and then suction filtered to obtain bright white crystals, which were obtained after vacuum drying at 50°C. The melting point was determined to be 120.09°C.

Embodiment 2

[0029] Weigh N-methyldiethanolamine and bromohexadecane into a three-necked flask equipped with a mechanical stirrer, reflux condenser, and thermometer. The molar ratio of bromohexadecane and N-methyldiethanolamine is 1.2: 1. React under heating in an oil bath, and the reaction temperature is 120°C. After reacting for 110 minutes, the crude product was recrystallized three times with a mixture of ethyl acetate and absolute ethanol, and then suction filtered to obtain bright white crystals, which were obtained after vacuum drying at 50°C. The melting point was determined to be 121.03°C.

Embodiment 3

[0031] Weigh N-methyldiethanolamine and bromohexadecane into a three-necked flask equipped with a mechanical stirrer, reflux condenser, and thermometer. The molar ratio of bromohexadecane and N-methyldiethanolamine is 0.9: 1. React under heating in an oil bath, and the reaction temperature is 100°C. After reacting for 110 minutes, the crude product was recrystallized three times with a mixture of ethyl acetate and absolute ethanol, and then suction filtered to obtain bright white crystals, which were obtained after vacuum drying at 50°C. The melting point was determined to be 121°C.

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Abstract

The invention discloses a process for preparing hexadecyl methyl 2-hydroxyethyl ammonium bromide. The process comprises the steps of weighing N-methyldiethanolamine and bromohexadecane to be placed in a three-opening flask provided with a mechanical agitator, a reflux condensing tube and a thermometer, and heating for reaction in an oil bath pan; after reacting fully, using a mixed liquid of ethyl acetate and absolute ethyl alcohol to perform recrystallization on crude products, performing suction filtration to obtain bright white crystals, and performing vacuum drying to obtain the hexadecyl methyl 2-hydroxyethyl ammonium bromide. According to the process, the N-methyldiethanolamine and the bromohexadecane serve as raw materials, a quaternary ammonium salt surfactant of the hexadecyl methyl 2-hydroxyethyl ammonium bromide is synthesized through a solvent-free process, and no solvent is used during preparation, so that pollution caused by organic solvents and the recovery cost are reduced. Prepared products are good in solubilization, foaming property and emulsifying property.

Description

Technical field [0001] The invention relates to a preparation method of cetyl methyl dihydroxyethyl ammonium bromide. Background technique [0002] The research on cationic surfactants in the world has a long history. As a typical cationic surfactant, quaternary ammonium salts can be widely used in leveling agents, anti-electric agents, fabric softeners, antibacterial agents, etc., and have excellent properties. It has the functions of conditioning, moisturizing, thickening, foaming and emulsification. [0003] Cetyl methyl dihydroxyethyl ammonium bromide, the chemical formula is C21H46BrNO2, and the structural formula is shown in formula (I). [0004] [0005] Cetyl methyl dihydroxyethyl ammonium bromide is an important cationic surfactant. The existing preparation methods all react with the participation of solvents. Most of the organic solvents are harmful to the human body and difficult to recover. Green environmental protection has become more and more important to all walks o...

Claims

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Application Information

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IPC IPC(8): C07C213/08C07C215/02
Inventor 李白千彭晓翊陈悦凯郑成毛桃嫣黄武欢陈瑞兰罗方然周虹谷
Owner RIFENG ENTERPRISE GRP CO LTD
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