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Title:
METHOD FOR PRODUCING HIGH-PURITY DIARYL CARBONATE
Document Type and Number:
WIPO Patent Application WO/2023/058681
Kind Code:
A1
Abstract:
A method for industrially producing a high-purity diaryl carbonate, the method comprising: a first refining step for continuously introducing a mixture containing a diaryl carbonate to a refining column A that has a side-cut discharge port and continuously separating, through distillation, the mixture into a column peak component (At), a side-cut component (As) including the diaryl carbonate, and a column bottom component (Ab) including a catalyst; and a second refining step for continuously introducing the side-cut component (As) to a diaryl carbonate refining column B that has a side-cut discharge port and continuously separating, through distillation, the component into three components which are a column peak component (Bt), a side-cut component (Bs), and a column bottom component (Bb) to obtain a high-purity diaryl carbonate as the side-cut component (Bs).

Inventors:
OCHI HIROYUKI (JP)
Application Number:
PCT/JP2022/037264
Publication Date:
April 13, 2023
Filing Date:
October 05, 2022
Export Citation:
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Assignee:
ASAHI CHEMICAL IND (JP)
International Classes:
C07C68/08; B01D3/14; C07C68/06; C07C69/96
Domestic Patent References:
WO2011105442A12011-09-01
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Foreign References:
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JPH09301931A1997-11-25
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Attorney, Agent or Firm:
INABA, Yoshiyuki et al. (JP)
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