Title:
POLYCARBONATE PRODUCTION METHOD, DIHYDROXY COMPOUND RECOVERY METHOD, AND POLYCARBONATE PRODUCTION APPARATUS
Document Type and Number:
WIPO Patent Application WO/2023/243592
Kind Code:
A1
Abstract:
The present invention provides a polycarbonate production method including: a polymerization step for polymerizing a dihydroxy compound and a diaryl carbonate, or prepolymers thereof in a polymerization reactor; a cleaning step in which an exhaust vapor that is discharged from the polymerization reactor used in the polymerization step, and that contains a hydroxyaryl compound, a diaryl carbonate, and a dihydroxy compound is brought into contact with a cleaning liquid in a scrubber; and a condensation step for condensing the exhaust vapor cleaned in the cleaning step, wherein at least a portion of a bottom liquid in the scrubber used in the cleaning step is supplied to the polymerization reactor.
Inventors:
HAYASHI FUMINORI (JP)
Application Number:
PCT/JP2023/021709
Publication Date:
December 21, 2023
Filing Date:
June 12, 2023
Export Citation:
Assignee:
ASAHI CHEMICAL IND (JP)
International Classes:
C08G64/30
Domestic Patent References:
| WO1999055764A1 | 1999-11-04 |
Foreign References:
| JP2000128975A | 2000-05-09 | |||
| JP2019127567A | 2019-08-01 | |||
| JP2018531145A | 2018-10-25 | |||
| US20190359902A1 | 2019-11-28 | |||
| JPH09255771A | 1997-09-30 | |||
| JPH11507985A | 1999-07-13 | |||
| JPH0665367A | 1994-03-08 |
Attorney, Agent or Firm:
INABA, Yoshiyuki et al. (JP)
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