Title:
PROCESS FOR PRODUCING BISPHENOL A
Document Type and Number:
WIPO Patent Application WO/2004/108643
Kind Code:
A1
Abstract:
A bisphenol A/phenol adduct is separated through crystallization from a reaction mixture. The resultant mother liquor is wholly subjected to isomerization and then recycled to a condensation reaction step, a concentration step, or a crystallization/solid-liquid separation step. Blowing is conducted simultaneously with the recycling in order to prevent impurities from accumulating in the system. Thus, bisphenol A and phenol are recovered from the liquid resulting from the isomerization, whereby high-quality bisphenol A can be efficiently produced.
Inventors:
KOHIRUIMAKI JUN (JP)
MASUDA SHUICHI (JP)
MASUDA SHUICHI (JP)
Application Number:
PCT/JP2004/007885
Publication Date:
December 16, 2004
Filing Date:
June 01, 2004
Export Citation:
Assignee:
IDEMITSU PETROCHEMICAL CO (JP)
KOHIRUIMAKI JUN (JP)
MASUDA SHUICHI (JP)
KOHIRUIMAKI JUN (JP)
MASUDA SHUICHI (JP)
International Classes:
C07C37/84; C07B61/00; C07C37/20; C07C39/16; (IPC1-7): C07C37/84; C07C37/20; C07C39/16
Foreign References:
| JPH06321834A | 1994-11-22 | |||
| JPH08333290A | 1996-12-17 | |||
| US4400555A | 1983-08-23 | |||
| JPH03284641A | 1991-12-16 |
Attorney, Agent or Firm:
Ohtani, Tamotsu (Bridgestone Toranomon Bldg. 6F 25-2, Toranomon 3-chom, Minato-ku Tokyo 01, JP)
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