Title:
純粋なN-ビニルピロリドンの取得方法
Document Type and Number:
Japanese Patent JP5334348
Kind Code:
B2
Abstract:
The invention describes a process for the isolation of pure N-vinylpyrrolidone from N-vinylpyrrolidone-containing crude products, comprising a single-stage or multistage crystallization process, which comprises passing the mother liquor from the first crystallization stage either to a distillative and/or extractive purification, or returning it to an N-vinylpyrrolidone-containing product stream of the preparation process.
Inventors:
Bernd Eck
Jörg Hylek
Martin Schmid-Radde
Herbert Helfeld
Jörg Hylek
Martin Schmid-Radde
Herbert Helfeld
Application Number:
JP2001586255A
Publication Date:
November 06, 2013
Filing Date:
May 25, 2001
Export Citation:
Assignee:
BASF SE
International Classes:
C07D207/267; C07D201/16; C07D207/26
Domestic Patent References:
| JP8506580A | ||||
| JP7179404A |
Attorney, Agent or Firm:
Takuya Kuno
Takahashi
Kimihiro Hoshi
Hiroyasu Ninomiya
Ryoichi Shino
Einzel Felix-Reinhard
Kimura Kiyoshi
Takahashi
Kimihiro Hoshi
Hiroyasu Ninomiya
Ryoichi Shino
Einzel Felix-Reinhard
Kimura Kiyoshi