To provide processes suitable for industrial production by which high-purity N-(long-chain acyl)amino acid and salt thereof can be prepared from inexpensive raw materials.
An alkyl ester of a fatty acid (2) is reacted with an aminonitrile (3) in the presence of a basic catalyst to form an amidonitrile (1), the amidonitrile (1) is hydrolyzed into an N-(long-chain acyl)amino acid salt (4) in the presence of a basic substance, the pH of the resulting aqueous solution is adjusted to a pH from 1 to 5 with a mineral acid to form an N-(long-chain acyl)amino acid (5), and this amino acid is recovered.
wherein R¹CO- represents a fatty acid residue having 8 to 22 carbon atoms; R² represents a hydrogen atom or an alkyl group having 1 to 3 carbon atoms; R³ represents an alkylene group having 1 to 5 carbon atoms; R⁴ represents an alkyl group having 1 to 4 carbon atoms; and M represents a monovalent cation.
提供一种适用于工业生产的工艺,通过该工艺可以用廉价原料制备高纯度的 N-(长链酰基)
氨基酸及其盐。
在碱性催化剂存在下,
脂肪酸烷基酯 (2) 与
氨基腈 (3) 反应生成脒腈 (1),脒腈 (1) 在碱性物质存在下
水解成 N-(长链酰基)
氨基酸盐 (4)、用矿物酸将所得
水溶液的 pH 值调节至 1 至 5,形成 N-(长链酰基)
氨基酸 (5),然后回收该
氨基酸。
其中 R¹CO- 代表具有 8 至 22 个碳原子的
脂肪酸残基;R² 代表氢原子或具有 1 至 3 个碳原子的烷基;R³ 代表具有 1 至 5 个碳原子的亚烷基;R⁴ 代表具有 1 至 4 个碳原子的烷基;M 代表一价阳离子。