Title:
ＮＭＰの蒸留装置
Document Type and Number:
Japanese Patent JP6898567
Kind Code:
B2
Abstract:
The present invention provides a distillation apparatus for NMP which is capable of regenerating a spent NMP recovered from a process for production of an electrode for lithium ion batteries on-site, in which the NMP can be purified in a simple and safe manner irrespective of variation in concentration of water in the raw material or throughput, and a recovery rate of the NMP can be further enhanced. The distillation apparatus for NMP according to the present invention comprises a raw material tank 41, a distillation column 1 and a product tank 42, in which the distillation column 1 is a side-cut type distillation column that comprises a top portion in which a liquid to be treated is separated into a high-concentration NMP and water comprising light-boiling components, a bottom portion in which a refluxed liquid in the distillation column is further subjected to distillation to separate the refluxed liquid into a high-purity NMP and the high-concentration NMP comprising high-boiling components, and a mid-stage portion from which the high-purity NMP is withdrawn as a side-cut vapor, and the distillation column is further provided at a rear stage thereof, with a condenser for condensing the high-purity NMP withdrawn as the side-cut vapor, and a flow control means for regulating an amount of a liquid of the high-purity NMP withdrawn from the condenser to the product tank.
Inventors:
Takahiro Tamura
Hisataka Takeda
Kaori Kudo
Hisataka Takeda
Kaori Kudo
Application Number:
JP2017535714A
Publication Date:
July 07, 2021
Filing Date:
March 30, 2017
Export Citation:
Assignee:
Mitsubishi Chemical Engineering Co., Ltd.
International Classes:
C07D207/267; B01D3/14
Domestic Patent References:
| JP2011056484A | ||||
| JP8109167A |
Foreign References:
| WO2012120666A1 |
Other References:
工場操作シリーズ 増補 蒸留,株式会社 化学工業社,1992年 7月31日,第115-117頁
Attorney, Agent or Firm:
Kazuhiko Okada