| Physical and Chemical Properties | Chemical quality This product is a white solid, soluble in water. |
| Use | Use as a foaming agent, Textile Auxiliaries, emulsifiers, corrosion inhibitors, etc. |
1.9 mol of ethanolamine is added to the reaction kettle (1), after replacing the air in the kettle with nitrogen, 1 mol of alkyl ethylene oxide is added dropwise, and heated and refluxed at 80~90 ℃ for 2 h. The excess of ethanolamine was distilled to obtain N-(2-hydroxyethyl)-N-(2-hydroxyalkyl) amine.
1 mol N-(2 hydroxyethyl)-N-(2-hydroxyalkyl) amine was added into the reaction kettle (2), then 1.2 mol methyl acrylate was added, stirred and mixed evenly, the temperature was raised to 70 ℃, and the reaction was carried out at 70~80 ℃ for 6 h. The most methyl acrylate has been steamed out to obtain N-(2-hydroxyethyl)-N-(2-hydroxyalkyl)-β-aminopropionate. Add sodium hydroxide solution to saponification at 80~90 ℃ and react for 4 h. The by-products methanol and water are distilled, and cooled and crystallized to obtain N-(2-hydroxyethyl)-N-(2-hydroxyalkyl)-β-aminopropionate sodium. Dissolve it in methanol and acidify it with concentrated hydrochloric acid. When the pH value reaches about 6, stop adding acid, stand still, and filter out inorganic salts. Evaporate ethanol, cool and crystallize the product.