pH-responsive amphoteric surfactant n-lauryl-(α-alkyl)-β-aminopropionic acid and preparation method and uses thereof

US10781165B2 · kind B2 · utility

Assignee

• SHAANXI UNIVERSITY OF SCIENCE AND TECHNOLOGY · CN

Inventors

• Xiaojuan Lai · Xi'an, CN
• Zhiqiang Dang · Xi'an, CN
• Lei Wang · Shanghai, CN
• Shaoyun Ma · Tuji, CN
• Xianwen Li · Beijing, CN
• Wei Tian · Gately Drive, SE
• Xingen Feng · Xi'an, CN
• Yinyin Zhang · Tuji, CN
• Xu Yang · Jinan, CN

Key dates

• Filing date: Jun 18, 2019
• Grant date: Sep 22, 2020
• Expiry date: Jun 18, 2039

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09K23/28
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Disclosed are a pH-responsive amphoteric surfactant N-lauryl-(α-alkyl)-β-aminopropionic acid and a preparation method and uses thereof. An alkylamine and a solvent are added to a three-necked flask, stirred for complete dissolution, slowly dropwise added with methyl α-alkyl-acrylate and reacted at room temperature after the ice-water bath is removed. The reaction mixture is refluxed in water bath and evaporated under rotation to remove the solvent and the residual methyl α-alkyl-acrylate to give N-lauryl-(α-alkyl)-β-aminopropionic acid. Then N-lauryl-(α-alkyl)-β-aminopropionic acid and water are added to a three-necked flask, slowly dropwise added with a sodium hydroxide solution and reacted in water bath to give a crude product, which is filtered and dried to give a purified surfactant sodium N-lauryl-(α-alkyl)-β-aminopropionate. This surfactant is suitable for the foamed acid system and its performance can be switched by adjusting pH due to pH sensitivity.