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1. (WO1998052896) METHOD FOR CONTINUOUS PRODUCTION OF DIHYDROXYDIPHENYLALKANES

Pub. No.:    WO/1998/052896    International Application No.:    PCT/EP1998/002644
Publication Date: Fri Nov 27 00:59:59 CET 1998 International Filing Date: Wed May 06 01:59:59 CEST 1998
IPC: C07C 37/20
C07C 39/04
Applicants: BAYER AKTIENGESELLSCHAFT
FENNHOFF, Gerhard
BUYSCH, Hans-Josef
FENGLER, Gerd
VAN OSSELAER, Tony
Inventors: FENNHOFF, Gerhard
BUYSCH, Hans-Josef
FENGLER, Gerd
VAN OSSELAER, Tony
Title: METHOD FOR CONTINUOUS PRODUCTION OF DIHYDROXYDIPHENYLALKANES
Abstract:
The invention relates to a method for continuous production of dihydroxydiphenylalkanes (bisphenols) by reacting fresh phenol and phenol obtained from the cleavage of by-products with isoalkenylphenol and ketone. The reaction mixture is thus distilled and yields extremely pure bisphenol. The residues and distillates containing the by-products undergo basic cleavage and optionally subsequent acid scission. The cleavage products which basically consist of isoalkenylphenol and phenol are optionally reacted after purification with the phenol obtained during purification of bisphenol to give bisphenol and the residue obtained from the cleavage is removed.