Title:
有機溶媒からのカプロラクタムの回収および精製方法
Document Type and Number:
Japanese Patent JP2004521923
Kind Code:
A
Abstract:
Process for recovering caprolactam from a solution comprising caprolactam dissolved in an organic solvent, said process comprising:a) washing the solution with water or an aqueous alkaline solution, resulting in a washed solution comprising caprolactam and organic solvent and in a washing residue,b) evaporating organic solvent from the washed solution, resulting in caprolactam product,c) optionally, hydrogenating the caprolactam product,d) optionally, evaporating water from the caprolactam product,e) distilling the caprolactam product to recover caprolactam and a distillation residue,f) extracting the distillation residue with an organic solvent in the presence of water to obtain (i) an extract comprising caprolactam dissolved in organic solvent and (ii) an aqueous effluent, andg) recycling the extract to step a) or b).
Inventors:
Ginter-De Honto, Maria, Louisa, Christina
Glute Zebert, Louise, Anne Marie
Remens, Johannes, Albertas, Wilhelms
Glute Zebert, Louise, Anne Marie
Remens, Johannes, Albertas, Wilhelms
Application Number:
JP2002569795A
Publication Date:
July 22, 2004
Filing Date:
February 27, 2002
Export Citation:
Assignee:
DSM IP ASSETS B.V.
International Classes:
C07D201/16; (IPC1-7): C07D201/16
Attorney, Agent or Firm:
Mitsuo Matsui