Title:
【発明の名称】ε―カプロラクタムの製造法
Document Type and Number:
Japanese Patent JP2001500123
Kind Code:
A
Abstract:
Process to prepare epsilon -caprolactam, in which in a step (a) a compound with the general formula: O=CH-(CH2)4-C(O)-R 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 epsilon -caprolactam, followed by a separate second step (b) in which the primary amino compounds are reacted to epsilon -caprolactam, wherein the solvent in step (a) is water or an aqueous medium, the yield to epsilon -caprolactam in step (a) is more than 10%, calculated on the initial molar amount of the compound according to formula (1), that epsilon -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).
Inventors:
Geat, Rudolph, Phillips, Maria
Buis, Wim
Buis, Wim
Application Number:
JP51250998A
Publication Date:
January 09, 2001
Filing Date:
August 28, 1997
Export Citation:
Assignee:
DSM N.V.
E.I.Dupont de Nemours and Company
E.I.Dupont de Nemours and Company
International Classes:
C07D201/00; C07D201/08; (IPC1-7): C07D201/00; C07D201/08
Attorney, Agent or Firm:
Mitsuo Matsui