Title:
A method for producing glycolide, which comprises a rectification step by gas-liquid countercurrent contact, and a method for purifying crude glycolide.
Document Type and Number:
Japanese Patent JP6326373
Kind Code:
B2
Abstract:
A method for producing glycolide provided with: step (1) wherein a GAO composition, which preferably contains a high-boiling-point organic solvent or a solubilizing agent, is supplied into a reactor and heated to a temperature at which a depolymerization reaction of the GAO occurs; step (2) wherein the heating is continued to subject the GAO to the depolymerization reaction, thereby producing glycolide; step (3) wherein glycolide is distilled out of the reactor; step (4) wherein the distillate is introduced into a rectifier and is rectified by means of gas-liquid countercurrent contact; and step (5) wherein glycolide is recovered. A method for purifying crude glycolide provided with: step (i) wherein a crude glycolide composition, which preferably contains a high-boiling-point organic solvent or a solubilizing agent, is supplied into a reactor and heated so that glycolicde is distilled; step (ii) wherein the distillate is introduced into a rectifier and is rectified by means of gas-liquid countercurrent contact; and step (iii) wherein glycolide is recovered. A glycolide producing apparatus and a crude glycolide purifying apparatus, each of which is provided with a reactor and a rectifier.
Inventors:
Takuya Osawa
Naoki Hayashi
Kentaro Otawara
Kazuyuki Yamane
Naoki Hayashi
Kentaro Otawara
Kazuyuki Yamane
Application Number:
JP2014548561A
Publication Date:
May 16, 2018
Filing Date:
November 19, 2013
Export Citation:
Assignee:
Kureha Co., Ltd.
International Classes:
C07D319/12
Domestic Patent References:
| JP2002128777A |
Foreign References:
| WO2002014303A1 | ||||
| WO2002083661A1 | ||||
| WO2001072736A1 | ||||
| WO2010073512A1 |
Attorney, Agent or Firm:
Harakenzo world patent & trademark