| Melting Point | 162~163 |
| PH | 7.0~8.0 |
| Physical and Chemical Properties | It is a white solid with a melting point of 162~163 ℃. This product belongs to the category of anionic surfactants. It has wetting, emulsification, foaming, and diffusion properties. Good thermal stability, resistant to acid, alkali, and strong oxidizing agents. |
| Use | Used as a waterproof and oil repellent in the textile industry. |
This product is not a hazardous material. Store in a cool and dry place, avoiding sunlight and rain.
1. Preparation of N-ethylperfluorooctylsulfonamide
Add 160kg of isopropyl ether and 270kg of ethylamine to the reactor, raise the temperature to 40 ℃, and then start adding 100kg of perfluorooctylsulfonyl fluoride dropwise. The dripping is completed within 5 hours. React at 40-50 ℃ for 8-10 hours. Wash the reactants with hydrochloric acid aqueous solution, separate the acid layer and place it in a stationary tank. The upper clear liquid is recycled for use. Dehydrate the ether layer. Steam out the solvent, cool and crystallize to obtain a light yellow solid N-ethylperfluorooctylsulfonamide (melting point 89~90 ℃ after recrystallization)
2. Preparation of N-ethylperfluorooctylsulfonylaminoacetate ethyl ester
Add 36.9kg of N-ethylperfluorooctylsulfonamide, 78kg of ethanol, and 11kg of sodium hydroxide to the condensation kettle in sequence. Dissolve all sodium hydroxide under reflux. Then add 17.2kg of ethyl chloroacetate for condensation reaction. Reflux for 6-8 hours. Cool, filter, remove impurities, and steam out ethanol to obtain the crude product of N-ethylperfluorooctylsulfonylaminoacetate ethyl ester.
3. Preparation of N-ethylperfluorooctylsulfonylaminoacetate
Add crude product to the saponification kettle, then add 100kg of 10% sodium hydroxide aqueous solution, and react for 5 hours at 80 ℃. Acidify with concentrated sulfuric acid to a pH of 7.0-8.0, and the reaction is complete. Cool and filter, vacuum dry to obtain white crystals. If the color turns yellow, recrystallization is necessary to ensure product purity. Waste liquid is discharged after purification.