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. ##STR1## wherein R.sup.1 CO-- represents a fatty acid residue having 8 to 22 carbon atoms; R.sup.2 represents a hydrogen atom or an alkyl group having 1 to 3 carbon atoms; R.sup.3 represents an alkylene group having 1 to 5 carbon atoms; R.sup.4 represents an alkyl group having 1 to 4 carbon atoms; and M represents a monovalent cation.
提供适合工业生产的工艺,可以从廉价原料中制备高纯度的N-(长链酰基)
氨基酸及其盐。
脂肪酸的烷基酯(2)在碱性催化剂的存在下与
氨基腈(3)反应,形成酰基腈(1),酰基腈(1)在碱性物质的存在下
水解成N-(长链酰基)
氨基酸盐(4),将产生的
水溶液的pH值用矿酸调整到pH值为1至5,形成N-(长链酰基)
氨基酸(5),然后回收这种
氨基酸。其中R.sup.1 CO--代表具有8至22个碳原子的
脂肪酸残基;R.sup.2代表氢原子或具有1至3个碳原子的烷基基团;R.sup.3代表具有1至5个碳原子的烷基基团;R.sup.4代表具有1至4个碳原子的烷基基团;M代表一价阳离子。