A process for the preparation of caprolactam is provided, wherein
a) a mixture (I) containing 6-aminocapronitrile and water is reacted in the gas phase, in the presence of a catalyst, to give a mixture (II) containing caprolactam, ammonia, water, high-boiling components and low-boiling components,
b) ammonia is then removed from the mixture (II) to give a mixture (III) containing caprolactam, water, high-boiling components and low-boiling components,
c) water is then removed from the mixture (III) to give a mixture (IV) containing caprolactam, high-boiling components and low-boiling components, and
d) a solid (V) containing caprolactam is then obtained from the mixture (IV) by crystallization, the proportion by weight of caprolactam in the solid (V) being greater than in the mixture (IV).
提供了一种制备己内酰胺的工艺,其中
a) 含有 6-
氨基
己腈和
水的混合物(I)在气相中,在催化剂存在下进行反应,得到含己内酰胺、
氨、
水、高沸点组分和低沸点组分的混合物(II)、
b) 然后从混合物 (II) 中除去
氨,得到含有己内酰胺、
水、高沸点组分和低沸点组分的混合物 (III)、
c) 然后从混合物(III)中除去
水,得到含有己内酰胺、高沸点组分和低沸点组分的混合物(IV),以及
d) 从混合物(IV)中结晶得到含有己内酰胺的固体(V),固体(V)中己内酰胺的重量比大于混合物(IV)中己内酰胺的重量比。