Process to prepare ε-caprolactam, in which in a step (a) a compound with the general formula:
O=CH-(CH2)4-C(O)-R (1)
in which R is -OH, -NH2 or O-R', in which R' is an organic group with 1 to 10 carbon atoms, is contacted with ammonia and hydrogen in a suitable solvent at elevated pressure in the presence of a hydrogenation catalyst to a mixture of primary amino compounds and ε-caprolactam, followed by a separate second step (b) in which the primary amino compounds are reacted to ε-caprolactam, wherein the solvent in step (a) is water or an aqueous medium, the yield to ε-caprolactam in step (a) is more than 10%, calculated on the initial molar amount of the compound according to formula (1), that ε-caprolactam is separated from the aqueous mixture obtained in step (a) by extraction and that the aqueous mixture resulting from the extraction, containing the primary amino compounds, is used in step (b).
制备ε-己内酰胺的工艺,其中在步骤(a)中,通式为:
O=CH-(
CH2)4-C(O)-R (1)
其中 R 为-OH、-NH2 或 O-R',其中 R'为 1 至 10 个碳原子的有机基团,在氢化催化剂存在下,在高压下于适当溶剂中与
氨和氢接触,生成伯
氨基化合物和 ε-己内酰胺的混合物,然后进行单独的第二步 (b),使伯
氨基化合物与 ε-己内酰胺反应、其中步骤(a)中的溶剂是
水或
水介质,步骤(a)中ε-己内酰胺的产率按式(1)化合物的初始摩尔量计算大于 10%,ε-己内酰胺通过萃取从步骤(a)中得到的
水性混合物中分离出来,萃取得到的含有伯
氨基化合物的
水性混合物用于步骤(b)。