Title:
METHOD FOR PRODUCING BISPHENOL AND METHOD FOR PRODUCING POLYCARBONATE RESIN
Document Type and Number:
WIPO Patent Application WO/2020/189201
Kind Code:
A1
Abstract:
This method for producing bisphenol includes: a step for mixing an organic phase 1 that contains bisphenol, the organic phase 1 being in a mixed solution 1 of an aqueous phase 1 and the organic phase 1, with a chelating agent to obtain a mixed solution 2 of an aqueous phase having a pH of 6 or less and an organic phase; a step for mixing the resultant mixed solution 2 and a base to obtain a mixed solution 3 of an aqueous phase having a pH of 8 or higher and an organic phase; and a step for removing the aqueous phase having a pH of 8 or higher from the resultant mixed solution 3 to obtain an organic phase 3A, the method being such that the solubility of the chelating agent in the aqueous phase of the mixed solution 3 is higher than the solubility in the organic phase of the mixed solution 3.
Inventors:
UCHIYAMA KEI (JP)
NAKASHIMA YUKIE (JP)
KISHIDA SHIN (JP)
TAKAMI YOSHIE (JP)
NAKASHIMA YUKIE (JP)
KISHIDA SHIN (JP)
TAKAMI YOSHIE (JP)
Application Number:
PCT/JP2020/007747
Publication Date:
September 24, 2020
Filing Date:
February 26, 2020
Export Citation:
Assignee:
MITSUBISHI CHEM CORP (JP)
International Classes:
C07C37/72; C07C39/15; C07C39/16; C08G64/06; C08G64/20
Foreign References:
| JPS58177928A | 1983-10-18 | |||
| JPH0967287A | 1997-03-11 | |||
| JPS56115733A | 1981-09-11 | |||
| JP2020007233A | 2020-01-16 |
Attorney, Agent or Firm:
SHIGENO, Tsuyoshi et al. (JP)
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