Title:
Method for Producing Purified Caprolactam from Beckmann Rearrangement of Cyclohexanone Oxym
Document Type and Number:
Japanese Patent JP6320413
Kind Code:
B2
Abstract:
A method is described for the production of purified caprolactam, comprising the steps: a) extraction with an organic extraction agent of raw caprolactam, obtained from the Beckmann rearrangement of cyclohexanone oxime, b) separation of the organic phase from step a), c) distillative separation of the organic extraction agent from the organic phase from step b), obtaining aqueous extract lactam, wherein, prior to distillative separation, an aqueous alkali hydroxide solution is added to a volume of 0 to 10 mmol/kg caprolactam, d) addition of 0 to 30 mmol alkali hydroxide/kg caprolactam to the aqueous extract lactam from step c), e) distillative dewatering of the aqueous extract lactam from step d) which has been mixed with alkali hydroxide, f) freeing the caprolactam from step e) of by-products with lower and higher boiling points than caprolactam by distillation, wherein at least 1.5 mmol alkali hydroxide/kg caprolactam is added in steps c) and d) combined.
Inventors:
Rolf Hartmoos Fisher
Henning-Peter Geerken
Andreas Ansman
Matthias Muller
Christian mirror
Henning-Peter Geerken
Andreas Ansman
Matthias Muller
Christian mirror
Application Number:
JP2015548430A
Publication Date:
May 09, 2018
Filing Date:
December 17, 2013
Export Citation:
Assignee:
BASF SE
International Classes:
C07D201/16; C07D201/04; C07D223/10
Domestic Patent References:
| JP2005504056A | ||||
| JP56008360A | ||||
| JP2008056620A | ||||
| JP2005502668A | ||||
| JP7330720A | ||||
| JP8048666A | ||||
| JP7330719A | ||||
| JP54109992A |
Attorney, Agent or Firm:
Einzel Felix-Reinhard
Takuya Kuno
Takuya Kuno