Title:
カプロラクタム製造工程で発生するアルカリ性廃液より炭素原子数4~6のジカルボン酸のエステル類を製造する方法
Document Type and Number:
Japanese Patent JP3986817
Kind Code:
B2
Abstract:
The present invention relates to a method for recovering and producing C4-C6 dicarboxylates from an alkaline waste solution generated in a caprolactam preparation process, in which the alkaline waste solution is treated with sulfuric acid to separate into an aqueous phase and an organic phase, allowing valuable substances contained in the organic phase to be firstly oxidized and converted into dicarboxylic acids. The dicarboxylic acids then undergo concentration, esterification and distillation processes, so as to obtain desirable C4-C6 dicarboxylates with high purity. This therefore provides an efficient and improved method for effectively recovering most valuable substances from the alkaline waste solution, so that economic benefits in recovery are greatly raised.
Inventors:
Zhou Shun
King Katsushi
Shigekazu Kure
Liu Yatada
Jiang Jian
King Katsushi
Shigekazu Kure
Liu Yatada
Jiang Jian
Application Number:
JP2001387321A
Publication Date:
October 03, 2007
Filing Date:
December 20, 2001
Export Citation:
Assignee:
Chongqing Industrial Business Co., Ltd.
International Classes:
C07C67/08; B01D3/14; C07B61/00; C07C51/27; C07C51/44; C07C55/10; C07C55/12; C07C55/14; C07C67/58; C07C69/003; C07C69/40; C07C69/42; C07C69/44
Domestic Patent References:
| JP56158730A | ||||
| JP51063116A | ||||
| JP44027205B1 | ||||
| JP48018219A | ||||
| JP2000204058A | ||||
| JP10175909A | ||||
| JP9512483A | ||||
| JP47035881B1 |
Attorney, Agent or Firm:
Hajime Tsukuni
Fumio Shinoda
Fumio Shinoda